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Balbharti Maharashtra State Board Class 8 English Solutions Chapter 1.4 Revathi’s Musical Plants Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 8 English Solutions Chapter 1.4 Revathi’s Musical Plants

Class 8 English Chapter 1.4 Revathi’s Musical Plants Textbook Questions and Answers

Warming Up

1. Discuss in groups and share your answers with the class:

Question 1.
Can you name the famous musician in Emperor Akbar’s court, who could perform miracles, when he sang different Ragas?
Answer:
Tansen

Question 2.
What miracles could he perform with his music?
Answer:
It is said that Tansen could create rain and fire just through his music. If he sang the Raga Deepak, the area around ; him would catch fire. If he sang Megha ; Malhar, it would begin to rain. If he sang an evening raga during daytime, the sunlight i would diminish and it would look like it j was dusk already.

Question 3.
What impact does music have on ! human beings?
Answer:
Music can make human beings happy, sad, nostalgic, mournful, etc. It can soothe them when they are stressed. It can also convey a lot of emotions like love, anger, etc. that may not be conveyed easily through words.

Question 4.
Do you think that music can have an impact on animals, birds and even | plants?
Answer:
Yes, definitely. It has already been proved by Jagdish Chandra Bose that plants respond to music. It is said that cows give more milk if they listen to good music. Our folklore is full of instances of snakes swaying to the music played by snake charmers.

2. Affirmative and Negative sentences:

Read the sentences below and spot the difference in their framing:
1. (a) I could not complete the work.
(b) I failed to complete the work.

2. (a) There is no sense in what you say.
(b) There is hardly any sense in what you say.

3. (a) He said he wouldn’t go.
(b) He refused to go.

You will observe that sentences marked (a) and (b) convey the same meaning. But in all sentences marked (a) there are negative words (no, not, wouldn’t) whereas the ones marked (b) do not have them.
Negative words are those that convey a negative meaning.
For example: never, no, neither, nor, not, cannot, don’t, isn’t, nothing etc.
If a sentence contains Negative words, it is called a Negative Sentence.
If a sentence does not contain any Negative word, it is called Affirmative sentence.

Note: While interchanging Negative and Affirmative sentence, the meaning and tense must not change.
You must use Negative words in the sentence, while transforming from Affirmative to Negative.
You may use words like hardly I fail to I refuse / reject / avoid / prohibit / without / ban etc., while changing Negative sentences to Affirmative.

Say whether the following sentences are Affirmative or Negative ones:

Question 1.
We must avoid hurting others.
Answer:
Affirmative

Question 2.
She didn’t offer me any help.
Answer:
Negative

Question 3.
Never give up hope.
Answer:
Negative

Question 4.
You must keep away from bad company.
Answer:
Affirmative

Question 5.
There is nothing in the bag.
Answer:
Negative

Question 6.
Entry is prohibited, without permission.
Answer:
Affirmative

1. Read the story and complete the following:

Question a.
At first, Revathi’s plants did not look normal and healthy because of _______.
Answer:
they had pale green leaves and their growth was stunted due to insufficient sunlight.

Question b.
When Revathi played her favourite raga, the plants began to move because _____.
Answer:
they liked the music she was playing.

Question c.
Revathi’s grief knew no bounds because _________.
Answer:
she could not find her pot of balsam plants.

Question d.
Revathi was confident of proving her ownership of her pot of plants because________.
Answer:
she knew that her plants loved music and would respond to her favorite raga. They would bend their stems towards her, proving that they were hers.

Question e.
Revathi won the prize for the ‘Best Plant’ because of ______.
Answer:
her plants were the best looking and the healthiest.

2. Answer in your own words:

Question a.
What did Revathi discover about her balsam plants?
Answer:
Revathi discovered that her balsam plants were not only taller and healthier than the other balsam plants, but they had started flowering earlier too. The flowers were big and brightly coloured, and one of the plants had an unusual kind of flower. She also discovered that while the plants liked her favourite tune, they did not like the tune with a quick rhythm.

Question b.
Why did Revathi decide to keep her new knowledge ‘a secret’?
Answer:
Revathi decided to keep her new knowledge a secret perhaps because she felt that it was something only between her and her beloved plants, whom she considered her friends. or perhaps she felt that nobody would believe her if she mentioned that her plants were music lovers.

Question c.
How did the plants respond when Revathi played her favourite tune?
Answer:
When Revathi played her favourite tune on her violin, the plants all bent their stems towards her even though there was no breeze.

Question d.
How did the plants react to the fast rhythmic music?
Answer:
When Revathi played a tune with a quick rhythm, the plants turned away from her as though they did not like what she was playing.

Question e.
How did Revathi prove to the organisers of the competition that the plants truly belonged to her?
Answer:
When Revathi played her favourite tune, the plants bent their stems towards her as though they wanted to touch her in their happiness. This convinced the organisers that the plants were hers.

Question f.
What helped Revathi to claim her plants her belief in magic or the belief in her convictions? Explain your choice.
Answer:
Her belief in her convictions helped Revathi to claim her plants. She was sure that her plants were music lovers and would respond to her favourite raga as they had done before. There was no magic involved. It was a fact.

3. A. An ord chain consists of words of a certain category that begin with the letter, that the previous word has ended with.
Complete the word chain adding Four Nouns from the text.
Music → courtyard → ………
Answer:
music → courtyard → days → surprise → evening → grief.

3. B. Add the appropriate Prefix to make the following words opposite in meaning.

1. continue
2. possible
3. certain
4. definite
5. believe
6. important
7. place
8. known
9. regular

Answer:

1. Discontinue
2. Impossible
3. Uncertain
4. Indefinite
5. Disbelieve
6. Unimportant
7. Displace/Misplace
8. Unknown
9. Irregular

3. C. Use the following expressions to make sentences of your own:

Question 1.
make up one’s mind
Answer:
make up one’s mind – One should think carefully before one makes up one’s mind about anything important.

Question 2.
struck as odd
Answer:
struck as odd: My friend’s continuous laughter on seeing her marks struck me as odd.

Question 3.
knew no bounds
Answer:
knew no bounds: My joy knew no bounds when I saw the little puppy on my bed.

Question 4.
flash across one’s mind
Answer:
Flash across one’s mind: When Sonam saw the tears in Dia’s eyes, it flashed across her mind that there was some problem.

Question 5.
to surmise
Answer:
to surmise: When the teacher saw Naomi crying, she surmised that she had failed ¡n the test.

Question 6.
not to deter
Answer:
not to deter: The loss of a leg did not deter Sudha Chandran from dancing.

4. Imagine there is a ‘Best Plant’ Competition in the locality /colony where you live. Frame a Notice about the same, in the form of an attracti’e poster.
Cover the following points.

Name of the organisation.
Name of the Contest.
Day, Date, Venue.
Who can participate.
Prizes.
Contact details for further enquiry.
Answer:

5. Types of sentences:

Study the following sentences.
Set (A)
Revathi was a student of music.
The flowers were big and brightly coloured; indeed.
They were requested to believe her.
All the above sentences are statements or assertions, and called Assertie or Declarative sentences.

Set (B)
Wasn’t Revathi a student of music?
How can we doubt her?
Do plants have ears?
The above sentences in Set (B) are Questions. They are called Interrogatie sentences.

Set (C)
Please believe me.
Let us rutch the fun.
Sit straight.
Excuse me.
In Set (C) the sentences are either requests, appeals, commands, suggestions etc. Such sentences are called Imperative Sentences.

Set (D)
How big and bright the flowers were!
What a surprise!
Ah, what beautiful music that is!
Set (D) has sentences that express strong feelings. They are called Exclamatory Sentences

State the kinds of the following sentences:

• How happily she played the violin!
• They all bent towards her.
• Don’t play that quick tune.
• She kept the knowledge a secret.
• How can plants enjoy music?
• How proudly did Revathi carry home her prize!
  What could have token my plants?
• The organisers were not convinced.

6. Make the following Negative using the negative words given:

Question 1.
There were a few potted plants in the courtyard. (not many)
Answer:
There were not many potted plants in the courtyard.

Question 2.
They looked healthier than the other plants. (not as healthy as)
Answer:
The other plants did not look as healthy as these plants.

Question 3.
She refused to share her secret. (would not)
Answer:
She would not share her secret.

Question 4.
She went around asking everyone about her plants. (No one / did not)
Answer:
She did not omit anyone when she went around asking about her plants.

7. Make the following Affirmutie using the words given:

Question 1.
There was no breeze. (hardly)
Answer:
There was hardly any breeze.

Question 2.
Their ridicule did not deter her. (failed to)
Answer:
Their ridicule failed to deter her.

Question 3.
Her mother knew nothing about it. (denied)
Answer:
Her mother denied knowing anything about it.

Question 4.
She did not give up. (refuse to)
Answer:
She refused to give up.

8. Imagine that Revathi’s father is abroad on business and she wishes to convey the news of her prize-winning plants. Draft un email for the above subject.
Answer:

Hi Dad,
How are you? How is your trip? Have you done a lot of sightseeing the past weekend? Please don’t forget to send some pics. I wish we could all have been in Paris with you.

I have some excellent news for you. Do you know those potted balsam plants in the corner of our courtyard? Well, I took one pot and gave it a lot of love and care. And guess what! It won the first prize in the ‘Best Plant’ contest in our colony!
But more important than that, Dad, is the fact that I have discovered that my plants love music, especially my favourite raga, Mohanam. They bend towards me when

I play that raga on my violin, and move I away when I play some music with a quick rhythm. No, it is not my imagination; I proved it to the organisers of the contest, and they have praised me for my discovery.I They will certainly talk to you about it when you come back.
Dad, I want to prove my discovery to you too. Please come back soon. Rest everything is fine. Lots of hugs and kisses from all of us.

Revathi.

Class 8 English Chapter 1.4 Revathi’s Musical Plants Additional Important Questions and Answers

Simple Factual Activity:
Fill in the blanks:

Question 1.
The instrument Revathi played was the _____.
Answer:
violin

Question 2.
Revathi’s favourite raga was ______.
Answer:
Mohanam

Question 3.
One day, she saw that there was a pot of ______ plants near the wall.
Answer:
balsam

Question 4.
Revathi decided to participate in the ______ contest to be held in her colony.
Answer:
Best Plant

Question 5.
Use the expression ‘to surmise’ to make a sentence of your own :
Answer:
When the teacher saw Naomi crying, she surmised that she had failed the test.

Pick out the conjunctions in the following sentences:

Question 1.
Her mother said she knew nothing either about the pot or the plants.
Answer:
either…or

Question 2.
The flowers were big and brightly coloured and one of the plants had an unusual kind of flower.
Answer:
and, and.

Complete the table and write who said the given words and to whom:
Answer:

The Words	Who said	To whom
(1) Do plants have ears?	The organisers	Revathi
(2) I know my plants.	Revathi	The organisers

Give reasons:

Question 1.
What shock did Revathi receive on prize distribution day?
Answer:
On prize distribution day, Revathi saw her lost pot of plants on a bench, with the name of a distant neighbour of hers as the competitor. She got a shock when she saw this.

Question 2.
Explain how Revathi planned to convince the organisers that the plants were hers.
Answer:
Revathi knew that her plants were music lovers. She planned to play : the violin and show the organizers how her plants responded to her music and bent their stems towards her. This would convince them that the plants were hers.

Question 3.
The organisers refused to believe that Revathi’s plants were music lovers.
Answer:
The organisers said that plants did not have ears like ours to listen to music. They had never heard of plants enjoying music. Hence, they refused to believe that Revathi’s plants were music lovers.

Punctuate the sentence:

they asked her do plants have ears like ours to enjoy your music
Answer:
They asked her, “Do plants have ears like ours to enjoy your music?”

Underline the nouns in the following sentence :

There was her pot of plants on a bench, with the name of a distant neighbour written on a small piece of cardboard and placed in the soil.
Answer:
There was her pot of plants on a bench, with the name of a distant neighbour written on a small piece of cardboard and placed in the soil.

Personal Response:

Question 1.
What would have been your reaction if you had been in Revathi’s place, and seen someone else’s name on your pot of plants? What would you have done?
Answer:
I would have been furious. I would have gone up to the person whose name was on my plants and shouted at her and tried to make her admit her theft. I would also have complained loudly to the organisers, hoping to shame her into admitting her guilt.

Rewrite the following sentences in the correct order of occurrence in the passage:

1. The organisers were stunned.
2. The neighbour accepted that she had stolen Revathi’s plants.
3. Revathi started playing her favourite raga.
4. Everyone applauded Revathi.

Answer:

1. Revathi started playing her favourite raga.
2. The organisers were stunned.
3. Everyone applauded Revathi.
4. The neighbour accepted that she had stolen Revathi’s plants.

Complex Factual Activities :

Give reasons :

Question 1.
No one suspected that the neighbour had stolen the plants.
Answer:
The neighbour was a regular participant In the competition. Hence, no one suspected that she had stolen the plants.

Question 2.
What is the happy end?
Answer:
In the end, the neighbour admitted j that she had stolen the plants, and that the plants were actually Revathi’s. The plants got the first prize. Everyone applauded Revathi’s discovery. Thus, the end of the story is a happy one.

Activities based on Vocabulary :

Write the noun forms of the following words :

• dejected
• favourite
• applauded
• submitted

Answer:

• dejection
• favour/ favouritism
• applause
• submission

Write the adjective forms of the following words:

• argument
• forgot
• responding
• proudly

Answer:

• argumentative
• forgettable/forgetful
• responsive
• proud

Activities based on Contextual Grammar:

Underline the adverbs in the following sentence:

She felt very dejected but was determined to win her plants back.
Answer:
She felt very dejected but was I determined to win her plants back.

Underline the conjunctions in the following sentence :

The authorities decided that Revathi’s plants deserved the first prize as they were the best-looking and healthy.
Answer:
The authorities decided that Revathi’s plants deserved the first prize as they were the best-looking and healthy.

Personal Response:

What helped Revathi to claim her plants-her belief in magic or her belief in her convictions? Explain your choice.
Answer:
Her belief in her convictions helped Revathi to claim her plants. She was sure that her plants were music lovers and would respond to her favourite raga as they had done before. There was no magic involved. It was a fact.

Grammar

Say whether the following sentences are Assertive, Interrogative, Imperative or Exclamatory:

Question 1.
How happily she played the violin!
Answer:
Exclamatory

Question 2.
They all bent towards her.
Answer:
Assertive

Question 3.
Don’t play that quick tune.
Answer:
Imperative

Question 4.
She kept the knowledge a secret.
Answer:
Assertive

Question 5.
How can plants enjoy music?
Answer:
Interrogative

Question 6.
How proudly did Revathi carry home her prize!
Answer:
Exclamatory

Question 7.
Who could have taken my plants?
Answer:
Interrogative

Question 8.
The organisers were not convinced.
Answer:
Assertive

Do as directed:

Question 1.
Prepare a word register of about 4 words from the lesson for ‘music’.
Answer:
Music – rhythm, tune, violin, raga

Question 2.
Use the phrase ‘pulled up’ in your own sentence :
Answer:
The watchman was pulled up for sleeping when he was on duty.

Question 3.
Spot the error and correct the sentence :That evening, all her friends was going to the prize distribution ceremony.
Answer:
That evening, all her friends were going to the prize distribution ceremony.

Question 4.
Find out four hidden words from the given word : (Each word should have at least 3 letters.) displayed
Answer:
displayed: display, play, plea, leap

Question 5.
Make a pair of sentences to show the difference between two meanings of the following word (homographs) : stem
Answer:
(i) The stem of a plant holds it up to sunlight
(ii) “All your health problems stem from poor eating habits,” said the doctor to Roshan.

Question 6.
Underline the adverbs in the following sentence :
They were slowly moving their stems, bending slightly towards her.
Answer:
They were slowly moving their stems, bending slightly towards her.

Question 7.
Pick out the prepositions in the following sentence :
She had been busy inside the house and had not been to the courtyard.
Answer:
She had been busy inside the house and had not been to the courtyard.

Question 8.
Rewrite using the verb form of the underlined word :
She kept her knowledge a secret.
Answer:
She kept what she knew a secret.

Question 9.
Rewrite using the word ‘normally’ in the sentence:
Plants need light for normal growth.
Answer:
Plants need light to grow normally.

Question 10.
She saw all her plants turn away from her as though they did not like what she was playing.
(Rewrite as an affirmative sentence.)
Answer:
She saw all her plants turn away from her as though they disliked what she was playing.

Balbharti Maharashtra State Board Class 6 Science Solutions Chapter 10 Force and Types of Force Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 6 Science Solutions Chapter 10 Force and Types of Force

Class 6 Science Chapter 10 Force and Types of Force Textbook Questions and Answers

1. Choose the term and fill in the blanks:

Question a.
……….. has to be applied to change the ……….. of a ……….. object.
(moving, direction, force)
Answer:
force, direction, moving

Question b.
When an elephant drags a wooden log over the land, the forces that are applied on the log are …………., ………. and …………. .
(muscular force, mechanical force, gravitational force, frictional force)
Answer:
muscular force, gravitationalforce, frictionalforce.

Question c.
A ball was set rolling on a large table. If its …….. has to be changed, a ……….. will have to be applied on it.
(force, motion, gravitation)
Answer:
motion, force

Question d.
The force of friction always acts ……….. the motion.
(along, against)
Answer:
against

2. Match the following:

Question a.

Column ‘A’	Column ‘B’
1. An ox pulling a cart	a. Magnetic force
2. Lifting heavy iron object with a crane	b. Electrostatic force
3. Weighing with a spring balance	c. Muscular force
4. Applying brakes to a bicycle.	d. Gravitational force
5. Picking up pieces of paper with a plastic scale.	e. Frictional force

Answer:

Column ‘A’	Column ‘B’
1. An ox pulling a cart	c. Muscular force
2. Lifting heavy iron object with a crane	a. Magnetic force
3. Weighing with a spring balance	d. Gravitational force
4. Applying brakes to a bicycle.	e. Frictional force
5. Picking up pieces of paper with a plastic scale.	b. Electrostatic force

3. One or more forces are acting in the following examples. Name them.

Question a.
An object falling from a tall building …………. .
Answer:
Gravitational force

Question b.
An aeroplane flying in the sky. …………. .
Answer:
Mechanical force

Question c.
Sqeezing sugarcane juice with a squeezer. …………. .
Answer:
Muscular or mechanical force

Question d.
Winnowing foodgrain …………. .
Answer:
Muscular force, gravitational force

4. Explain in your own words giving one example each.
Muscular force, gravitational force, mechanical force, electrostatic force, the force of friction and magnetic force.

Question a.
Muscular force:
Answer:
The force applied with the help of muscles is called muscular force.
e.g. When a bullock pulls the load of a cart with sugarcane, he uses the force of his muscles that is muscular force.

Question b.
Gravitational force:
Answer:
The force applied by the earth to pull the objects towards itself is called gravitational force.
e.g. When a fruit falls from a tree, it is the gravitational force of the earth that pulls the fruit.

Question c.
Mechanical force:
Answer:
The force applied by means of a machine is called mechanical force. Some machines run by muscular force while some use electricity or fuel.
e.g.Washing machine, electric pump uses electricity to work.

Question d.
Electrostatic force:
Answer:
Static electricity is produced on materials like rubber, plastic and ebonite due to friction. The force exerted by such electrically charged materials is called electrostatic force, e.g. When a plastic comb is rubbed against the dry hair, comb develops electrostatic charge.

Question e.
The force of friction:
Answer:
When two surfaces rub against each other, a force of friction is produced. This force always acts against direction of motion, e.g. A ball rolling over a flat surface stops at certain distance due to friction between the ball and the surface.

Question f.
Magnetic force:
Answer:
The force exerted by a magnet is called magnetic force.
e.g. In a pin holder, the magnet attracts the pins.

5. Why?

Question a
Machines are oiled from time to time.
Answer:
To reduce the friction between the parts of machines, they are oiled. This will help efficient working of machines.

Question b.
An object thrown upwards comes down after reaching a point.
Answer:
An object is pulled by the gravitational force of the earth. Hence an object thrown upwards comes down after reaching at certain point.

Question c.
Powder is sprinkled on a carrom board.
Answer:
When powder is sprinkled on a carrom board, friction between the coin and the board decreases so that the coin can be pocketed easily.

Question d.
The ramp at a railway station has a rough surface.
Answer:
The rough surface of the ramp increases the friction between feet and the surface. This helps us to walk on the ramp without skidding or falling.

6. In what way are we different? 

Question a.
Muscular force and Mechanical force
Answer:

Muscular force		Mechanical force
1. The force applied with the help of muscles is called muscular force. e.g. A boy kicking a football.		1. The force applied by means of machine is called mechanical force. e.g. An electric pump works on electricity.
2. It is created by our muscles.		2. It is created by electricity or fuel or muscular force

Question b.
A force of friction and Gravitational force
Answer:

Force of friction		Gravitational force
1. When two surfaces rub against each other, the force of friction comes into force.		1. The force applied by the earth to pull an object towards itself, is called a gravitational force.
2. It comes to act between two surfaces.		2. It exists between two objects or an object and the earth.

7. Write answers to the following questions in your own words. 

Question a.
What are the things that can be done by applying force?
Answer:
By applying force:

1. we can set an object in motion.
2. we can stop a moving object.
3. we can change the speed or direction or both of a moving object.
4. we can change the shape of an object.

Question b.
What is meant by weight?
Answer:

1. The gravitational force acting on an object is called its weight.
2. Greater force must be applied to lift a greater weight.

Question c.
Which machines run on muscular force?
Answer:
The machines that run on muscular force are:

1. Bicycle
2. Hand cart
3. Boat
4. Cycle rickshaw
5. Stretching of a spring
6. Ball pen
7. Vegetable chopper
8. Sharpener
9. Pulley
10. Fruit peeler

8. Solve the following crossword puzzle.

Question a.
Solve the following crossword puzzle.

Down:
1. ………. force is applied to push a scooter that has failed.
2. ………. force can be used to pick up scattered pins.

Across:
3. A ………. pulls iron nails towards itself.
4. ……….. force is used when farm is ploughed with a tractor.
5. It is due to the force of ………… that raindrops fall to the ground.
Answer:

Activity:

Question 1.

Collect more information about the various forces that are used in our day-to-day life.

Question 2.
Make a list of such actions where many forces are applied simultaneously.

Class 6 Science Chapter 10 Force and Types of Force Important Questions and Answers

Choose the term and fill in the blanks:

Question 1.
When powder is sprinkled on a carrom board, friction ……….. .
(increases, decreases)
Answer:
decreases

Question 2.
Electrostatic force is due to …………. .
(gravitation, friction)
Answer:
friction

Question 3.
Fruits fall on the ground due to ………… force.
(mechanical, gravitational)
Answer:
gravitational

Question 4.
Friction between two rough surfaces is …………. than between two smooth surfaces.
(greater, lesser)
Answer:
greater

Question 5.
The sound created by a stone dropped in a bucket of water from 100 cm height is ………… than that dropped from 20 cm height.
(milder, louder)
Answer:
louder

Question 6.
A scooter has stopped in the middle of the road as the petrol tank has become empty. So Raju has to use …………. force to take it to petrol pump.
(mechanical, muscular)
Answer:
muscular

One or more forces are acting in the following examples. Name them.

Question 1.
Srikant is playing basketball
Answer:
Muscular force

Question 2.
Raju rubs a peacock feather between pages of his notebook
Answer:
Electrostatic force

Question 3.
When you rub the palm of your hands, you feel the heat on the palms
Answer:
Frictional force

Question 4.
A blacksmith uses a hammer to beat the hot piece of iron
Answer:
Muscular force

Question 5.
A cricketer hits the ball, but it stops just before the boundary line
Answer:
Frictional force

Question 6.
We can walk on the road without falling down.
Answer:
Frictional force

Give scientific reasons:

Question 1.
Magnet is used to lift heavy iron bar.
Answer:
A magnet attracts the iron bar. As a result it is easier to lift the heavy iron bar using magnetic force.

Question 2.
An inflated balloon when rubbed against a silk cloth, pulls the hair on our skin.
Answer:
When an inflated balloon is rubbed against a silk cloth, it develops electrostatic force due to friction. This force pulls the hair on our skin.

Question 3.
We are likely to slip when we walk on a oily or wet floor.
Answer:
Wet or oily floor reduces the friction between our feet and surface. Hence we are likely to slip on wet or oily floor.

Distinguish between:

Question 1.
Force of friction and Electrostatic force
Answer:

Force of friction	Electrostatic force
1. It exists between any two surfaces in contact.	1. It develops where certain objects are rubbed  against certain material.
2. No electric charge is developed, sometimes heat is developed. e.g. A brake is applied on a bicycle.	2. Electric charge is developed. e.g. Thermocol rubbed against silk cloth.

Answer the following:

Question 1.
Why do planets revolve round the sun in definite orbits?
Answer:

1. The gravitational force operates between the sun and the planets in the solar system.
2. Hence, they revolve round the sun in definite orbits.

Question 2.
Which forces are acting upon an aeroplane taking off into the sky?
Answer:
Aeroplane uses mechanical force, Pilot exerts muscular force. Frictional force between aeroplane and air, gravitational force due to weight of an aeroplane.

Question 3.
What happens to the iron nail when the magnet is taken away from it?
Answer:

1. As we take the magnet away from the iron nail, it does not attract the iron nail as magnetic force decreases.
2. Magnet is unable to exert force if the nail is not placed in the range of the magnetic field.

Question 4.
When brakes are applied while riding a bicycle, it stops after running a distance. Why?
Answer:

1. When brakes are applied while riding a bicycle, frictional force comes to act between the tyres of the bicycle and the surface.
2. This force opposes the tendency of the bicycle to stop.
3. Hence, the bicycle has to overcome this force before it stops.

Can you tell?

Question 1.
What happens when you hold the two ends of a spring and pull them apart?
Answer:
Its shape changes due to the force exerted by pull.

Question 2.
What happens when a blacksmith hammers a red hot piece of iron?
Answer:
Shape of iron piece changes.

Observe and discuss:

Observe the figures given and name the force needed for the motion.

Question 1.
Boat with boatman.

Answer:
Muscular force

Question 2.
Bullock cart.

Answer:
Muscular force

Question 3.
A tractor.

Answer:
Mechanical force

Question 4.
Sewing machine.

Answer:
Mechanical force

Question 5.
Fruit falling from tree.

Answer:
Gravitational force

Question 6.
A man carrying heavy sac.

Answer:
Gravitational force

Question 7.
A pin holder.

Answer:
Magnetic force

Question 8.
A ramp.

Answer:
Gravitational force

Question 9.
Carrom board.

Answer:
Frictional force

Question 10.
Mixer grinder.

Answer:
Mechanical force

Balbharti Maharashtra State Board Class 6 Science Solutions Chapter 15 Fun with Magnets Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 6 Science Solutions Chapter 15 Fun with Magnets

Class 6 Science Chapter 15 Fun with Magnets Textbook Questions and Answers 

1. How will you do this?

Question a.
Determine whether a material is magnetic or non-magnetic.
Answer:

1. To determine whether the material is magnetic or non-magnetic, a magnet is moved over it.
2. If the material sticks to the magnet, it is called magnetic material.
3. If the material does not stick to the magnet, it is non-magnetic.

Question b.
Explain that a magnet has a certain magnetic field.
Answer:

1. The space around a magnet in which the magnetic force is active is called the magnetic field.
2. Place a white paper on a drawing board and place a bar magnet in the middle of the paper.
3. Spread the iron filings on the sheet and gently tap the sheet.
4. The iron filings arrange around the magnet in definite curved lines forming a symmetric pattern.
5. The lines are closer to each other near the poles and less crowded in the middle region around the magnet.
6. Beyond a particular region, the iron filings, will not get attracted.
7. The region where iron filings are attracted is the magnetic field of the magnets.

Question c.
Find the north pole of a magnet.
Answer:

1. Take a bar magnet. Tie a thread to the centre of a bar magnet and hang it from a stand.
2. Note the direction in which the magnet settles and turn it around again.
3. Allow it to settle and note the direction.
4. The end of the magnet that points to the north is called the north pole, while the end that points to the south is called the south pole.
5. The north pole is indicated by ‘N’ and the south pole by ‘S’.

2. Which magnet will you use?

Question a.
Iron is to be separated from a trash.
Answer:

1. Sharp and heavy iron scrap material is attached to a big disc.
2. The disc is a magnet and all scrap is attracted to it.
3. It is not possible to create, store such a big size magnet. Therefore magnetism is induced in the disc with the help of electricity.

An electromagnet is used which is attached to a crane for loading and unloading, transporting scrap and loose iron material from a trash.

Question b.
You are lost in a forest.
Answer:

1. If we are lost in a forest, we should take help of a mariner’s compass which will help us to find the directions while travelling through unknown regions.
2. If mariner’s compass is not available, a bar magnet when suspended in the centre will rest in north-south direction.

Question c.
A window shutter opens and shuts continuously in the wind.
Answer:
A bar magnet can be attached to the window pane so that the window will be closed tight during strong winds also.

3. Fill in the blanks with appropriate word.

Question a.
If a bar magnet is hung by a thread tied at its centre, its north pole becomes steady in the direction of the …………… pole of the earth. (south, north, east, west)
Answer:
North

Question b.
If a bar magnet is cut into equal pieces by cutting it at right angles to its axis at two pieces …………… bar magnets are formed, and a total of …………… poles are formed. (6,3,2)
Answer:
3, 6

Question c.
There is a repulsion between the …………… poles of a magnet and attraction between its ……………. poles. (opposite, like.)
Answer:
like, opposite

Question d.
When magnetic material is taken close to a magnet, the material acquires …………… . (permanent magnetism, induced magnetism, temporary, magnet keeper)
Answer:
induced magnetism

Question e.
If a magnet attracts a piece of metal, that piece must be made of ………… .(any other metal but iron, magnetic material or iron, non-magnetic material, electromagnets)
Answer:
magnetic material or iron

Question f.
A magnet remains steady in a ………….. direction. (east-west, north-south,)
Answer:
north-south

4. Write the answers in your words.

Question a.
How is an electromagnet made?
Answer:
1. To make an electromagnet we need the following apparatus; An iron nail of 10 cm length, 1 metre long insulated copper wire, a battery cell, pins.
2. Wind the copper wire around the nail as shown in the figure. Connect the free ends of the wire to the two terminals of a cell through a plug key.
3. Close the key to complete the circuit.
4. Bring small pins near the tip of the nail and observe.
5. When the circuit is completed, the iron pins are attracted by the nail and hence, they stick to the nail.

6. When the circuit is broken, the pins fall off.
7. A magnet is prepared by passing an electric current through an insulated wire wound around the iron nail. This is an electromagnet.
8. When the current is allowed to pass, the nail becomes a magnet and attracts pin / pins stick to it.
9. When the current is put off the nail does not behave as a magnet and therefore, pins fall off.
10. The magnetism is temporary in the case of an electromagnet.

Question b.
Write the properties of a magnet.
Answer:
Magnet possess following properties/ characteristics.

1. Magnet always settles in the north-south direction.
2. The magnetic force is concentrated at the two ends or poles of a magnet.
3. If a magnet is divided into two parts, two independent magnets are formed. It means that the two poles of a magnet cannot be separated from each other.
4. A magnetic material acquires magnetism when placed near a magnet. This magnetism is called induced magnetism.
5. There is repulsion between like poles of a magnet, while there is attraction between the opposite poles.

Question c.
What are the practical uses of a magnet?
Answer:

1. Magnets are materials to which objects made from iron, nickel, cobalt are attracted. But man explored magnets and its properties and made his life comfortable.
2. Permanent Magnets: are used in caps of pin holders, doors of fridges, doors of cupboards etc.
3. Temporary magnets: Electromagnets are used in electric bells, circuit of various machines, ATM card swipe machines, MRI- Magnetic Resonance Image, loudspeakers, electric cranes, microphones, Mariner’s compasses, etc.

Activity

Question 1.
Collect information regarding how the various magnets used in our day-to-day tasks are produced.

Question 2.
Collect information about the magnetism of the earth.

Class 6 Science Chapter 15 Fun with Magnets Important Questions and Answers

Fill in the blanks.

Question 1.
Iron objects ………….. to a magnet.
Answer:
stick

Question 2.
A magnet is used in ………….. and ………….. .
Answer:
gadgets and machines

Question 3.
The materials that stick to a magnet are called ………….. materials.
Answer:
magnetic

Question 4.
Materials that do not stick to a magnet are called ………….. materials.
Answer:
non-magnetic

Question 5.
When a magnet attracts an object, that object is ………….. due to the magnetic force.
Answer:
displaced

Question 6.
Magnetism is a form of ………….. .
Answer:
energy

Question 7.
A magnet always settles in the ………….. direction.
Answer:
north-south

Question 8.
The north pole is indicated by’ …………… and the south pole by ‘……………’.
Answer:
‘N’-‘S’

Question 9.
The end of the magnet that points to the north is called the ………….. .
Answer:
Northpole

Question 10.
The end of the magnet that points to the south is called the ………….. .
Answer:
South pole

Question 11.
The magnetic force is concentrated at the two ends or ………….. of a magnet.
Answer:
poles

Question 12.
If a magnet is divided into two parts, two ………….. magnets are formed.
Answer:
independent

Question 13.
It means that the two poles of a magnet cannot be ………….. from each other.
Answer:
separated

Question 14.
A magnetic material acquires magnetism when placed near a
Answer:
magnet

Question 15.
Iron filling stick to the iron bar when the ………….. is near it.
Answer:
magnet

Question 16.
There is ………….. between like poles of a magnet.
Answer:
repulsion

Question 17.
There is ………….. between the opposite poles of a magnet.
Answer:
attraction

Question 18.
Magnetic objects ………….. magnetism.
Answer:
induce

Question 19.
Material ………….. is a mixture of aluminium, nickel and cobalt.
Answer:
Alnico

Question 20.
………….. magnets are made from a mixture of nickel, cobalt and iron.
Answer:
Permanent

Question 21.
The bar of soft or pure iron which protects a magnet is called ………….. .
Answer:
magnet keeper

Question 22.
Magnetism gets ………….. when a magnet is heated, thrown, knocked about or broken into pieces.
Answer:
destroyed

Question 23.
Electromagnetic energy is used in our ………….. life.
Answer:
day-to-day

Question 24.
The metals iron, cobalt, nickel are ………….. materials.
Answer:
magnetic

Question 25.
………….. is a natural magnet.
Answer:
Magnetite

Match the columns.

Question a.

Column ‘A’	Column ‘B’
1. Iron, nickel, cobalt	(a) Electromagnet
2. Door bell magnet	(b) Permanent magnet
3. Nickel, cobalt, aluminium	(c) Magnetic metal
4. Cupboard magnet	(d) Mariner’s compass
5. Lodestone	(e) Alnico

Answer:

Column ‘A’	Column ‘B’
1. Iron, nickel, cobalt	(c) Magnetic metal
2. Door bell magnet	(a) Electromagnet
3. Nickel, cobalt, aluminium	(e) Alnico
4. Cupboard magnet	(b) Permanent magnet
5. Lodestone	(d) Mariner’s compass

State whether true or false. If false, correct the statement.

Question 1.
Material alnico is a mixture of aluminium, nickel and iron.
Answer:
False: Material alnico is a mixture ofaluminium, nickel and cobal.

Question 2.
Magnetism of electromagnet is permanent.
Answer:
False: Magnetism of electromagnet is temporary.

Question 3.
The bar of soft or pure iron protects the magnet.
Answer:
True

Question 4.
Like poles attract each other and unlike poles repel each other.
Answer:
False: Like poles repel each other and unlike poles attract each other.

Question 5.
The magnetic force is concentrated at the centre of the magnet.
Answer:
False: The magnetic force is concentrated at the poles of the magnet

Question 6.
Magnetism is a kind of energy.
Answer:
True

Question 7.
Mariner’s compass is used for finding directions while travelling.
Answer:
True

Question 8.
Cobalt is a magnetic material.
Answer:
True

Question 9.
The north pole is indicated by ‘S’ and the south pole is indicated by ‘N’.
Answer:
False: The north pole is indicated by Wand the south pole is indicated by ‘S’.

Question 10.
Electromagnetism is used in many places in our day-to-day life.
Answer:
True

Answer the following questions in one sentence.

Question 1.
What is a magnet?
Answer:
The material to which objects made from iron, nickel, cobalt get attracted is called as magnet.

Question 2.
What is magnetism?
Answer:
The property of a material to which objects made from iron, nickel, cobalt get attracted is called as magnetism.

Question 3.
What are magnetic materials?
Answer:
Materials that stick to a magnet are called magnetic materials, e.g. cobalt, nickel, iron.

Question 4.
What are non-magnetic materials?
Answer:
Materials that do not stick to a magnet are called non-magnetic material, e.g. plastic, rubber, glass etc.

Question 5.
What are lodestones?
Answer:
Lodestones are leading stones which are used for finding the directions while travelling through unknown regions.

Question 6.
How is magnetism a kind of energy?
Answer:
Work is done by magnetic force. Thus, magnetism is a kind of energy.

Question 7.
What is an electromagnet?
Answer:
When magnetism is produced in the iron due to the electric current, it is called an electromagnet.

Question 8.
How are permanent magnets made?
Answer:
Permanent magnets are made from a mixture of nickel, cobalt and iron.

Question 9.
List the instruments where electromagnets are used.
Answer:
Electromagnets are used in doorbells, cranes, loudspeakers, voltameters, TVs, antennas, radios etc.

Question 10.
How is magnetism destroyed?
Answer:
When magnets are heated, thrown, knocked about or broken into pieces, magnetism gets destroyed.

Question 11.
What is a magnet keeper?
Answer:
A magnet keeper is a bar of soft or pure iron which protects a magnet. It is a piece of soft iron placed in the box in which a magnet is kept.

Question 12.
Magnets exist in variety of shapes.
Answer:
Today, magnets are used in many machines, gadgets and devices. They are all man-made. Hence, they can have a variety of shapes depending upon their use.

Answer the following briefly.

Question 1.
What are leading stones?
Answer:

1. It was known quite long ago to the people in China and Europe that a piece of magnetite, hung freely always settled in the north-south direction.
2. These rocks then came to be used for finding the directions while travelling through unknown regions.
3. That is why they are called leading stones or Lodestones.

Question 2.
What has led to the invention of the Mariner’s compass?
Answer:
Leading stones have led to the invention of the mariner’s compass.

Question 3.
List the different shapes of magnets.
Answer:

1. Magnets have a variety of shapes depending on their uses.
2. They are bar magnets, disc magnets, horseshoe magnets, ring shaped magnets, cylindrical magnets, and small button magnets.

Question 4.
What are permanent magnets?
Answer:

1. Magnets which do not lose their magnetism easily are called permanent magnets or Magnets which are made up of magnetic substances are permanent magnets.
2. e.g. Magnets fixed in a pin holder, magnets of a door of a cupboard are permanent magnets.
3. Permanent magnets are made from a mixture of
   • Nickel, cobalt, iron
   • Aluminium, nickel, cobalt – alnico

Give scientific reasons.

Question 1.
Why is it important to place a magnet keeper in a box along with magnets?
Answer:
Magnetism gets destroyed when a magnet is heated, thrown, knocked about or broken into pieces. A magnet keeper which is a bar of soft or pure iron protects a magnet.

Question 2.
Cranes with magnets are used.
Answer:
When a magnet attracts an object, that object is displaced due to the magnetic force. In factories, ports, garbage depots, large objects are lifted and shifted from place to place using cames. Hence cranes are fitted with magnets.

Can you tell?

Question 1.
Pins in a pin holder do not fall? While we are shutting the door of a fridge, we find that it closes automatically from certain distance and does not open unless pulled again.
Answer:
Magnet is fitted in the cap of a pin holder and in the door of a fridge. Iron objects stick to the magnet.

Question 2.
Take a magnet from the laboratory and bring it near various objects in your use. Which of them stick to the magnet? What material is each of them made of? Observe these things carefully. Classify the objects into two groups: those which stick to the magnet, those which do not.
Comb, table, cupboard – iron, spoon, scissors, pen, pencil, eraser, books, mobile, laptops, glass bangles, hair pin, cupboard handle, chair, steel lunch box, magnetic stickers, toys, gold ring.
Answer:

Stick to the magnet	Doesn’t stick to the magnet
Iron cupboard, spoon, scissors, hairpin, steel lunch box, magnetic stickers	Comb, table, pen, pencil, eraser, books, glass bangles, chair, mobile, laptops, cupboard handle, toys, gold ring

Question 3.
Take a mixture of sand, pieces of paper, sawdust, iron filings and pins in a saucer and pass a magnet around the mixture. What do you see?
Answer:
When magnet is moved over a mixture of sand, pieces of paper, sawdust, iron filings and pins, pins and iron filings will cling to the magnet. Sand, sawdust and pieces of paper will remain behind.

Question 4.
How is a Mariner’s Compass used?
Answer:

1. A Mariner’s Compass is a magnetic needle used in navigation to show direction by deflections.
2. It is a direction-finding instrument used in navigation.
3. It is placed on the maps, grounds, decks as it will point to the magnetic north pole.
4. It has two or more magnets permanently attached to a compass card which moves freely on a pivot.
5. The needle fixed on the compass bowl indicates the ship’s heading position.

Question 5.
Find out where the magnet given are used?
Answer:

Magnets	Uses
Horseshoe magnet	used in electric bell
Circular magnet	used in loudspeaker.
Magnetic needle	used in Mariner’s Compass.
Disc magnets	used in toys
Bar magnets	used in cupboard doors
Button magnet	supporting side rails or blockouts
Square magnet	Industries
Arc magnet	Electric motors and generators.
Cylindrical magnet	used in medicine, used in treatment of scoliosis patients.

Question 6.
Identify the different types of magnets as shown in the picture below.
Answer:
a. Circular magnet
b. Cylindrical magnet
c. Horseshoe magnet
d. Bar magnet

Balbharti Maharashtra State Board Class 6 Science Solutions Chapter 9 Motion and Types of Motion Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 6 Science Solutions Chapter 9 Motion and Types of Motion

Class 6 Science Chapter 9 Motion and Types of Motion Textbook Questions and Answers

1. Identify the types of motion.

Question a.
Movement of the earth around the sun: …………… .
Answer:
periodic, drcular

Question b.
Movement of ceiling fan: …………… .
Answer:
circular

Question c.
A rocket launched from the ground: ……….. .
Answer:
linear

Question d.
A fish swimming in water: ……… .
Answer:
random

Question e.
The plucked string of a sitar:………….. .
Answer:
oscillatory motion

2. Fill in the blanks.
(linear, non-linear, uniform linear, non-uniform linear, uniform circular, random, circular, non-uniform circular)

Question a.
If a ball is released from the terrace of a building, it comes down in ………… motion. On the other hand, it reaches the ground in ………… motion if it is thrown with a force away from the terrace in a direction parallel to the terrace.
Answer:
uniform linear, non-uniform linear

Question b.
The motion of an aeroplane on the runway before take off is …………. .
Answer:
linear

Question c.
The kite looking for its prey flies with …………. motion in the sky.
Answer:
circular

Question d.
Children sitting in a rotating giant wheel have ………. motion, while those sitting in a merry-go-round have a ………. motion.
Answer:
uniform circular, non-uniform circular

3. How are we different?.

Question a.
Oscillatory motion and Linear motion.
Answer:

Oscillatory motion	Linear motion
1. In oscillatory motion, body swings back and forth. e.g. Motion of a swing, motion of pendulum of a clock.	1. In linear motion, an object shows displacement in a straight line, e.g. A train in motion, motion of marching soldiers.

Question b.
Linear motion and Random motion
Answer:

Linear motion	Random motion
1. Motion in a straight line is called linear motion. e.g. Motion of a train	1. The motion that changes its direction and speed continuously is called random motion, e.g. Motion of a bird.

Question c.
Random motion and Oscillatory motion
Answer:

Random motion	Oscillatory motion
1 The motion that changes its direction and speed continuously is called random motion, e.g. Motion of a butterfly	1. The motion of a body that is swinging back and forth is called oscillatory motion, e.g. Pendulum of a clock, the wing of a bird.

4. Explain in your own words, giving one example each.

Question a.
Linear motion
Answer:
An object that shows displacement along a straight line is called linear motion, e.g. A vehicle moving on a road.

Question b.
Oscillatory motion
Answer:
The motion of a body swinging back and forth is called oscillatory motion, e.g. Motion of a pendulum of a clock.

Question c.
Circular motion
Answer:
The motion of an object along a circular path is called circular motion, e.g. Motion of a ceiling fan.

Question d.
Random motion
Answer:
The motion that changes its direction and speed continuously is called random motion, e.g. Motion of a butterfly.

Question e.
Periodic motion
Answer:
The repetitive motion in which the moving object passes through a certain point again and again after a fixed period is called as periodic motion, e.g. The minute hand of a clock.

5. Answer the following questions in your own words. 

Question a.
Which types of motion are seen in birds flying in the sky?
Answer:

1. The birds flying in the sky exhibit random motion.
2. The wings of the birds show oscillatory motion.

Question b.
Write in detail about your experience of various types of motion while riding a bicycle on a road.
Answer:

1. The cycle itself shows linear motion.
2. The wheels of the cycle show circular motion.
3. The cycle chain shows periodic motion, if the speed is uniform.
4. The handle bar shows random motion.

6. Complete the puzzle using words for types of motion: 

Question a.
Complete the puzzle using the words for types of motion.
1. A spring is stretched and one end is released.
2. A minute hand.
3. A see-saw.
4-5.  Children in a march past.
6. A stone rolling down a hillside.

Answer:

1. Oscillatory
2. Circular
3. Periodic
4. Uniform
5. Linear
6. Random

Activity:

Question 1.
Make a list of various moving objects in the environment, and discuss the types of motion seen in them.

Class 6 Science Chapter 9 Motion and Types of Motion Important Questions and Answers

Identify the types of motion.

Question 1.
The movement of a see-saw.
Answer:
oscillatory motion

Question 2.
The motion of a moving ant.
Answer:
random

Question 3.
The marching army soldiers.
Answer:
linear

Question 4.
A train approaching a station.
Answer:
non-uniform linear

Question 5.
A meteor falling from the sky.
Answer:
linear

Fill in the blanks with suitable words from those given in the bracket:
(linear, non-linear, uniform linear, non-uniform linear, uniform circular, random, circular, non-uniform circular)

Question 1.
The motion that changes its speed and direction continuously is called ………. .
Answer:
random

Choose the correct alternative:

Question 1.
A baby is crawling. The motion is said to be …………….. .
(a) linear
(b) periodic
(c) circular
(d) random
Answer:
(d) random

Question 2.
The children are having a 50m running race. The motion exhibited is ………….. motion.
(a) linear
(b) periodic
(c) random
(d) circular
Answer:
(a) linear

Question 3.
The motions of the hands of a clock are ………….. and …………. .
(a) periodic, linear
(b) periodic, circular
(c) non-linear, non-uniform
(d) circular, non-uniform
Answer:
(b) periodic, circular

Question 4.
The motion of a pendulum of a clock is ……………. .
(a) linear
(b) oscillatory
(c) circular
(d) random
Answer:
(b) oscillatory

Question 5.
The motion of a butterfly from one flower to another flower is an example of …………… motion.
(a) circular
(b) periodic
(c) linear
(d) random
Answer:
(d) random

Question 6.
The distance traversed by an object in a unit time is called ……….. of that object.
(a) length
(b) motion
(c) speed
(d) displacement
Answer:
(c) speed

Explain it in your own words, giving one example of each.

Question 1.
Uniform linear motion
Answer:
When the distance traversed by an object along a straight line in unit time is the same, the motion is called as uniform linear motion, e.g. Motion of soldiers on parade.

Question 2.
Non-uniform linear motion
Answer:
When the distance traversed by an object along a straight line in unit time keeps on changing, the motion is called non-uniform linear motion.
e.g. A girl coming down a slide.

Question 3.
Non-linear motion
Answer:
The motion of an object that does not move in a straight line is called non-linear motion.
e.g. Motion of a swing,

Question 4.
Speed
Answer:
The distance traversed by an object in unit time is called the speed of that object.
e.g. A boy riding on a bicycle covers a distance of 15 kilometres in 3 hours.
Hence Speed = \(\frac{15}{3}\) = 5 kilometres/hour

Answer the following:

Question 1.
In which muscial instruments can you see oscillatory motion?
Answer:
Vibrating diaphragm of tabla, drum, dhol and strings of sitar, guitar show oscillatory motions.

Question 2.
With reference to types of motion, complete the table below.

Answer:

1. Non-linear
2. Uniform
3. Oscillatory
4. Periodic
5. Random.

Read the following stories and answer the questions.

Rita and Geetha are friends travelling from Mumbai to Pune. Seetha had come to the station to see her friends off. After 15 minutes train starts moving. Rita and Geetha feel that Seetha and the vendors on platform are moving backwards. Whereas, Seetha feels that Rita and Geetha are moving forward. Rita feels Geetha is not in motion and Geetha also feels Rita is not in motion. Can you say why?

Question a.
Are Rita and Geetha in motion?
Answer:
Rita and Geetha are not in motion as far as each other are concerned, as no displacement takes place. Both are in a train. For Seetha, both of them are in motion.

Question b.
Are the vendors and Seetha in motion?
Answer:
No, the vendors and Seetha are not in motion. But Rita and Geetha feel as if they are moving backwards.

Question c.
What can you conclude from this passage?
Answer:
An object which is in motion for one person may not be in motion for another. This shows that motion is relative.

Observe and discuss:

Question 1.
Observe the figure and classify the type of motion.


Answer:

1. Circular motion
2. Linear motion
3. Circular motion
4. Linear motion
5. Oscillatory motion
6. Oscillatory motion
7. Circular motion
8. Circular motion
9. Bird – Random; Wings – Oscillatory motion
10. Circular motion
11. Linear, circular

Can you tell?

Question 1.
While chasing a butterfly in a garden, do you run along a definite path or in the same direction all the time?
Answer:
No, we move in random motion.

Balbharti Maharashtra State Board Class 8 English Solutions Chapter 1.3 The Pilgrim Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 8 English Solutions Chapter 1.3 The Pilgrim

Class 8 English Chapter 1.3 The Pilgrim Textbook Questions and Answers

Warming Up:

Make groups and discuss the following using the given points:

Question a.
What fatal dangers/problems did mankind face centuries ago, but are no longer a threat today?
Answer:
(Points : wild animals – lack of food – certain diseases – climate etc.)

Question b.
Name a few scientists/explorers/ social reformers / inventors / discoverers, who spent most of their lives to find solutions to some major problems/ setbacks that mankind faced.
Answer:
(Points : Alexander Fleming, Edison, Ronald Ross, Christopher Columbus, Wright brothers, Raja Ram Mohan Roy, Galileo, Marie Curie, Savitribai Phule, Babasaheb Ambedkar, etc.)

Question c.
Did they themselves suffer from those problems/setbacks?
Answer:
(Points : most did not)

Question d.
What inspired them to spend the best part of their lives to research and share their findings?
Answer:
(Points : a passion for well-being of ! mankind – personal goals and aims – interest in the subject – curiosity – the urge to improve society and help others – etc.)

2. Read and understand the following poetic devices:

(A) If two or more words in the same line convey the some meaning, the Figure of Speech in thut line is called Tautology.
For example: It brought joy and cheer.
They groaned with aches and pains.

(B) ‘Poets often change the proper grammatical order of words in the ¡inc of a poem, in order to make the lines rhyme or to emphasize upon something. The Figure of Speech in such lines is called inersion’ or Anastrophe.’
For example: Up came the sun. Down the hill, it flowed.

(C) When a question is asked in order to create a dramatic effect and not to get an answer, in a line of the poem, the Figure of Speech used is called
Interrogation / Rhetorical Questions:
For example: What is this life, if full of care?
When can their glory fade?

1.Pick out words from the poem to fill in the web diagram. They should be related to the theme in the web.

Answer:

2.The entire poem is metaphorical (Implied comparison).
Match the words in Column A with what they imply in Column B.

Answer:
(1) pilgrim – a dutiful man
(2) journey – life
(3) evening or close of day – old age
(4) chasm, deep and wide – threat to life
(5) building a bridge – solving a problem /getting rid of a threat to life
(6) pitfall – trap
(7) close of day – death

3. A. Read the poem and write 3 qualities of each of the following.

Answer:

3. B. Answer in your own words.

Question a.
Why did the old man have no need to build the bridge, across the chasm?
Answer:
The old pilgrim had already crossed the chasm and would never pass that way again. Hence, the old man had no need to build the bridge across the chasm.

Question b.
What explanation did he give to the fellow- pilgrim for his thoughtful deed?
Answer:
The old man said that though he had already crossed the chasm, there was a fair-haired youth who was about to pass that way. The old man was experienced and was not afraid of the chasm. However, the young man was inexperienced and the chasm could prove to be a pitfall for him.
He too had to cross it at twilight, and the old man was building a bridge to help this youth.

Question c.
What message does the poem convey to all of us?
Answer:
The message that the poem conveys to us is that we must be generous ) and unselfish and think of others. We must try to help others who are not as experienced as we are.

4. A. Note the rhyming words in the first stanza:
way – gray I wide-side- tide / dim -him.
Poet has used a deliberate pattern of lines that rhyme with other lines in the poem or
the stanza. This pattern can be identified by giving the rhyming pairs of words the
same letter of the alphabet.
For example: l stanza of this poem has the pattern AABCCBB
So, AABCCBB is called the Rhyme Scheme of the 1stanza of the poem
‘The Pilgrim’.
Answer:
(i) the 2nd stanza : ddaabb
(ii) the 3rd stanza: eeaaffcc

4. B. Now write the Rhyme Scheme of the 2stanza and 3 stanza
Remember that a line in the 2d or stanza may rhyme with lines in P’ stanza,
too. You may use the sanie letter of the alphabet as used in the 1 stanza.
Answer:
(i) Came at evening, cold and gray. To a chasm, deep and vast and wide.
(The correct prose order Is: Came on a cold and gray evening to a deep and wide and vast chasm.)
(ii) To the fair-haired youth. may a pitfall be.
(The correct prose order is : To the fair-haired youth, It may be a pitfall.)

4. C. Find two lines from the poem that j contain the figure of speech ‘Inversion’.
Answer:
(i) Came at evening, cold and gray, To a chasm, deep and vast and wide.
(The correct prose order is : Came on j a cold and gray evening to a deep and wide and vast chasm.)
(ii) To the fair-haired youth, may a pitfall be.
(The correct prose order is : To the fair-haired youth, it may be a pitfall.)

Pick out one line each that contains the following figures of speech:
(Note: Refer to the next page for the explanation.)

Question a.
Tautology:
Answer:
To a chasm, deep and vast and wide.
The words vast and wide have similar meaning.

Question b.
Personification:
Answer:
A pilgrim, going a lone highway.
The highway is given the human quality of being lonely.

Question c.
Interrogation:
Answer:
Why waste your time in building here?
A question is asked to emphasize an idea.

5. Imagine that you are the fellow – pilgrim and you wish to share your experience of the incident in the poem. Write a short article about it for a magazine / journal. Also convey what change it has brought in our life.

Class 8 English Chapter 1.3 The Pilgrim Additional Important Questions and Answers

Complete the following:

Question 1.
Although he had already crossed the chasm, the pilgrim ________.
Answer:
paused and built a bridge across the waters.

Question 2.
The old pilgrim built the bridge to to __________.
Answer:
help the Inexperienced youth who was following on the same path.

Complex Factual Activities:
Give reasons:

Question a.
The fellow pilgrim was puzzled.
Answer:
The old pilgrim had already crossed the chasm and would never pass that way again. Yet, he was building a bridge across the chasm. The fellow pilgrim could not understand the reason for this and was hence puzzled.

Question b.
What/Who could be the third pilgrim?
Answer:
The third pilgrim could be a young, inexperienced youth.

Analysis/Appreciation Of A Poem
Answer:
(1) Poem and poet: ‘The Pilgrim’ by Will Allan Dromgoole
(2) Theme: Those who have faced the difficulties of life successfully and are experienced must be unselfish and help those who are inexperienced and may face difficulties.
(3) Tone: Serious.
(4) Structure and stanzas: Stanzas of unequal length; 1st stanza – 7 lines; 2nd stanza – 6 lines; 3rd stanza – 8 lines;
(5) Rhyme and Rhythm: 1st stanza – AABCCBB; 2nd stanza – ddaabb; 3rd stanza – eeaaffcc
(6) Language and Imagery: The narrative is direct with some archaic language used; there is a strong underlying message. The descriptions are vivid.
(7) Figures of Speech: Inversion, Tautology, Personification, Interrogation.

Writing Skills:

“Imagine that you are the fellow-pilgrim and you wish to share your experience of \ the incident in the poem. Write a short j article about it for a magazine/journal.
Also convey what change it has brought in your life.
Answer:

The Turning Point

There are certain incidents in one’s life which have an impact on a person and prove to be a turning point in their lives. Let me narrate the incident which shook me awake.

I was on a hike in some hilly places when I had to cross a deep ravine which had a gushing river flowing through it. I managed to cross without any difficulty to my surprise, an old man ahead of me also crossed it nimbly. As I was about to continue on my way, I saw the old man turn back and build a rough bridge across the water. It took a lot of effort and I stood by wondering. Finally, I asked him, “Sir, it is late evening and you Eire not likely to cross this way again. Why are you building a bridge now?”

The old man’s answer floored me. “You confused child,” he said with a smile. “I have completed my journey – true. But behind me is a young boy who is inexperienced.

He will soon reach this chasm, and he may have difficulty in crossing it. I am building this bridge to help him.”
I stood still, amazed at the generosity and unselfishness of the old man, who was putting in the time and effort to help someone he did not even know. He was building a bridge that he would never ever cross.

This incident left an indelible mark on my mind. Since that time, I always try to help others even though it may not be beneficial to me in any way. However, it gives me something immeasurable – peace and happiness. Try it out, won’t you? (indelible – permanent; unfading)

Balbharti Maharashtra State Board Class 6 Science Solutions Chapter 8 Our Skeletal System and the Skin Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 6 Science Solutions Chapter 8 Our Skeletal System and the Skin

Class 6 Science Chapter 8 Our Skeletal System and the Skin Textbook Questions and Answers

1. Fill in the blanks with the proper word. 

Question a.
The place where two or more bones are connected is called a …………… .
Answer:
joint

Question b.
Cells of epidermis contain a pigment called ………… .
Answer:
melanin

Question c.
…………… and ……………. are the two layers of the human skin.
Answer:
epidermis, dermis

Question d.
The human skeletal, system is divided into ………….. parts.
Answer:
two

2. Match the pairs.

Question a.

Column ‘A’	Column ‘B’
1. Ball and socket joint	a. Knee
2. Hinge joint	b. Wrist
3. Gliding joint	c. Shoulder

Answer:

Column ‘A’	Column ‘B’
1. Ball and socket joint	c. Shoulder
2. Hinge joint	a. Knee
3. Gliding joint	b. Wrist

3. Right or wrong? If wrong, write the correct sentence. 

Question a.
Bones are soft.
Answer:
Wrong: Bones are hard.

Question b.
The human skeleton protects the internal organs.
Answer:
Right

4. Put a [✓] mark at the proper places.

Question a.
The system which gives our body. a definite shape to
(a) Excretory system [ ]
(b) Respiratory system [ ]
(c) Skeletal system [ ]
(d) Circulatory system [ ]
Answer:
(c) Skeletal system [✓]

Question b.
The ………… joint is seen in fingers and toes.
(a) Hinge joint [ ]
(b) Ball and socket joint [ ]
(c) Immovable joint [ ]
(d) Gliding joint [ ]
Answer:
(a) Hinge joint [✓]

5. Answer the following questions in your words.

Question a.
What are the functions of your skin?
Answer:
The functions of the skin are :

1. Protects the internal parts of the body like muscles, bones, organ systems etc.
2. Help to preserve the moisture in the body.
3. Synthesizing Vitamin D.
4. Regulates body temperature by releasing sweat.
5. Gives protection from heat and cold.
6. Functions as the sensory organ of touch

Question b.
What should you do to keep the bones strong and healthy?
Answer:
To keep the bones strong and healthy:

1. We should include calcium and phosphrous rich food in our diet.
2. We also include vitamin D rich food in our diet.
3. We get these from milk, milk products, leafy vegetables, meat and exposure to sunlight.
4. We should exercise regularly.

Question c.
What are the functions of human skeletal system?
Answer:
The functions of human skeletal system are:

1. Gives a definite shape to the body.
2. Provides support to the body.
3. Protects the delicate organs inside the body.

Question d.
Which are the various reasons due to which our bones might break?
Answer:
The bones in our body might break due to:

1. Lack of calcium and phosphorous.
2. Due to fracture because of an accident or a fall.
3. Lack of proper nutrition.
4. Due to deficiency of Vitamin D.

Question e.
What are the different types of bones? How many types are there? Give example of each.
Answer:
There are four types of bones in our body:

Types of Bone	Example
1. Flat bones	Sternum in the chest
2. Small bones	Stirrup in each ear
3. Irregular bones	Vertebra posterior (back side) of the body
4. Long bones	Femur or thigh bone

Types of Bone Example

1. Flat bones Sternum in the chest
2. Small bones Stirrup in each ear
3. Irregular bones Vertebra posterior (back side) of the body
4. Long bones Femur or thigh bone

6. What will happen if?

Question a.
There are no joints in our body.
Answer:
If there are no joints in our body, we will be standing like a tree without any movement, we can move only because of joints.

Question b.
There is no melanin pigment in our body.
Answer:
We will not have protection from ultraviolet rays. Our skin will become whitish.

Question c.
Instead of 33 vertebras in our body, we had one single and straight bone.
Answer:
We cannot bend down at our will.

7. Draw diagrams.

Question a.
Types of joints.
Answer:

Question b.
Structure of skin
Answer:

Activity:

Question 1.
Collect pictures of the different parts of the human skeletal system and paste them on chart paper. Write the functions of
each, too.

Question 2.
Collect the pictures, newspaper cuttings, etc. which show the skeletal systems of various animals and observe the differences between them.

Class 6 Science Chapter 8 Our Skeletal System and the Skin Important Questions and Answers

Choose the correct alternative:

Question 1.
The ………………….. protects the brain.
(a) skull
(b) rib cage
(c) spine
(d) none of above
Answer:
(a) skull

Question 2.
X-rays were discovered by …………………..  .
(a) Sir C.V.Raman
(b) Galileo
(c) Sir Isaac Newton
(d) Roentgen
Answer:
(d) Roentgen

Question 3.
The bones of ………………….. are immovable.
(a) hand
(b) leg
(c) spine
(d) skull
Answer:
(d) skull

Question 4.
We can move the bones of ………………….. in a 360° angle.
(a) elbow
(b) knee
(c) shoulder
(d) wrist
Answer:
(c) shoulder

Question 5.
Our body temperature usually remains constant at ………………….. °C.
(a) 32
(b) 35
(c) 37
(d) 40
Answer:
(c) 37

Question 6.
The part of the skin which maintains body temperature is ………………….. .
(a) Epidermis
(b) Dermis
(c) Subcutaneous layer
(d) Network of blood vessels and nerve fibers
Answer:
(c) Subcutaneous layer

Fill in the blanks:

Question 1.
Except for the …………….., none of the bones of the skull can move.
Answer:
lower jaw

Question 2.
The spinal cord originates from the …………… .
Answer:
brain

Question 3.
The longest and the strongest bone in the human body is …………… .
Answer:
femur

Question 4.
…………….. is the smallest bone in our body.
Answer:
stirrup

Question 5.
The vertical, flat bone in the chest is called the ……………… .
Answer:
sternum

Question 6.
The …………… joint moves in a 180° angle.
Answer:
hinge

Match the columns:

Question 1.

Column ‘A’	Column ‘B’
1. Skull	a. 25 bones
2. Rib cage	b. 6 bones
3. Spine	c. 22 bones
4. Both ears	d. 33 bones

Answer:

Column ‘A’	Column ‘B’
1. Skull	c. 22 bones
2. Rib cage	a. 25 bones
3. Spine	d. 33 bones
4. Both ears	b. 6 bones

Question 2.

Column ‘A’	Column ‘B’
1. Lower jaw	a. Movable joint
2. Ears	b. Femur
3. Thigh	c. Movable joint in skull
4. Elbow	d. Smallest bone

Answer:

Column ‘A’	Column ‘B’
1. Lower jaw	c. Movable joint in skull
2. Ears	d. Smallest bone
3. Thigh	b. Femur
4. Elbow	a. Movable joint

Right or Wrong? If wrong, write the correct answers:

Question 1.
The spine is a part of the appendicular skeleton.
Answer:
Wrong: The spine is a part of the axial skeleton.

Question 2.
Ankle joints are gliding joints.
Answer:
Right

Question 3.
All the skull joints are immovable.
Answer:
Wrong: Except lower jaw, all the skull joints are immovable.

Question 4.
The skin maintains normal body temperature.
Answer:
Right

Answer in one word:

Question 1.
The part which protects the heart and lungs.
Answer:
Rib cage

Question 2.
Ali falls down and his elbow is broken.
Answer:
Fracture

Question 3.
The image which spots the broken bone.
Answer:
X-ray

Question 4.
The biotic component of our body.
Answer:
Bone cell

Question 5.
The part which protects the vertebral column.
Answer:
Spine

Question 6.
The part which connects the bone in our body.
Answer:
Ligament

Question 7.
The organ which helps us to sense whether something is hot or cold.
Answer:
Skin

Question 8.
The pigment which gives colour to the skin.
Answer:
Melanin

Can you tell?

Question 1.
What is a fracture? How will you help a friend who has met with an accident and fractured his leg?
Answer:
Fracture is a crack or break in a bone. Fracture may occur due to accident or fall from height or injury. If my friend’s leg is fractured, then. I would –

1. Ask him to prevent any movement of the fractured part.
2. Get immediate medical help.
3. Take the x-ray image of the fractured or swollen part.
4. An x-ray image shows the exact spot where the bone is broken. This will help in providing proper treatment.

Question 2.
What are the properties of bones?
Answer:
The properties of bones are:

1. Bones are hard and not flexible.
2. Bone cells are composed of two main constituents:
   • Bone cells are biotic components.
   • Calcium carbonate, calcium phosphate, minerals and salts are abiotic components.
3. Calcium imparts strength to bones.
4. As we grow the size and length of bones increases upto a certain limit.

Question 3.
What is human skeletal system? How is it divided?
Answer:

1. All the bones together form a framework or a skeleton.
2. All the bones of the body along with cartilage together form the skeletal system.
3. The human skeletal system can be divided into two parts – the axial skeleton and the appendicular skeleton.
4. The axial skeleton consists of the skull, the spine and the rib cage. These are situated symmetrically along the central axis.
5. The appendicular skeleton consists of the bones of arms and legs on either side of the central axis.

Question 4.
What is a joint? What are it’s types?
Answer:
Joints are places where two or more than two bones are connected to each other.

Question 5.
Describe the structure of skin.
Answer:

1. Human skin is made up of two main layers- outermost layer, epidermis and layer below it called dermis.
2. Below dermis there is a network of blood vessels and nerve fibers.
3. Under this layer there is a subcutaneous layer, which maintains body temperature.
4. The epidermis has various layers.
5. There are sweat glands in the skin which secrete sweat.

Question 6.
Write a short note on melanin.
Answer:

1. Melanin is a pigment present in the cells of epidermis.
2. Melanin is synthesized in certain glands in the skin.
3. The percentage of melanin decides the fairness or darkness of the skin.
4. Melanin protects our skin and the inner parts from ultraviolet sunrays.

Use your brain power!

Question 1.
Which colour of the skin will give greater protection from sun’s rays?
Answer:
Darker colour will give greater protection.

Give scientific reasons:

Question 1.
We are able to bend down at our will.
Answer:

1. 33 bones of the spine are placed straight one above the other.
2. They are arranged flexibly.
3. Their flexibility allows us to bend down at our will.

Question 2.
Calcium is an important mineral.
Answer:

1. Calcium imparts strength to our bones.
2. If we are calcium deficient, possibility of bone fracture during a fall or an accident increases.
3. Hence, calcium is an important mineral.

Question 3.
Sweating helps to lower the body temperature.
Answer:

1. In the hot sun, the temperature of the skin rises.
2. The sweat is released.
3. The heat required for the evaporation of sweat is drawn from the body itself.
4. Hence, sweating lowers the body temperature.

Question 4.
Some people have jet black hair, while others have brown or reddish hair.
Answer:

1. It is melanin that determines the colour of our hair.
2. Jet black hair is due to pure melanin.
3. Brown hair is due to sulphur in the melanin.
4. Reddish hair is due to iron in the melanin.

Question 5.
Observe and discuss:
Your grandmother has wrinkles on her skin.
Answer:

1. As we grow older, the proportion of fat beneath the skin reduces.
2. However, previously tout skin does not shrink.
3. This causes wrinkles on the face of older people.

What will happen if:

Question 1.
If skin had no sweat glands.
Answer:
Skin regulates body temperature by releasing sweat. If skin had no sweat glands then we will not be able to maintain our body temperature at a constant 37°C.

Can you recall?

Question 1.
Which organ help us to sense whether something is hot or cold, rough or smooth, etc?
Answer:
The skin functions as the sensory organ of touch.

Question 2.
What happens when we walk or play in the hot sun?
Answer:
When we walk or play in the sun, we get tired, our skin secrete sweat.

Observe the figure and label as directed.

Question 1.

In the above figure label the parts marked a, b, c, d, e and hence show axial and appendicular
skeleton.
Answer:
(a) Skull
(b) Rib cage
(c) Spine
(d) Arm
(e) Leg
Axial skeleton: skull, the spine and rib cage
Appendicular: legs, arms

Question 2.

In the given figure, name the type of bones marked a, b, c, d. State where they are seen in our body.
Answer:
(a) Flat bones – rib cage and gliding joint
(b) small bones – finger
(c) Irregular bones – vertebal column
(d) Long bones – legs, arms

Balbharti Maharashtra State Board Class 6 Science Solutions Chapter 16 The Universe Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 6 Science Solutions Chapter 16 The Universe

Class 6 Science Chapter 16 The Universe Textbook Questions and Answers

1. Name these.

Question a.
Birthplace of stars.
Answer:
Nebulae

Question b.
The biggest planet in the Solar System.
Answer:
Jupiter

Question c.
The galaxy which is our neighbour.
Answer:
Andromeda

Question d.
The brightest planet in the solar system.
Answer:
Venus

Question e.
Planet with the largest number of satellites.
Answer:
Jupiter

Question f.
Planet without a single satellite.
Answer:
Venus and Mercury

Question g.
Planet with a rotation different from other planets.
Answer:
Venus

Question h.
A celestial body that carries a tail along.
Answer:
Comet

2. Fill in the blanks.

Question a.
The group of galaxies of which our Milky Way is a part is called ………….. .
Answer:
Local group

Question b.
Comets are made of ………… .
Answer:
ice and dust particles

Question c.
The planet ……………… appears as if it is rolling along its orbit.
Answer:
Uranus

Question d.
…………….. is a stormy planet.
Answer:
Jupiter

Question e.
The pole star is the best example of a ………………. type of star.
Answer:
variable

3. Say if the statements given below are right or wrong. Rewrite the statements after correcting them.

Question a.
Venus is the planet closest to the sun.
Answer:
Wrong: Mercury is the planet closest to the sun.

Question b.
Mercury is called a stormy planet.
Answer:
Wrong: Jupiter is called a stormy planet.

Question c.
Jupiter is the biggest planet.
Answer:
Right

4. Answer the following.

Question a.
What is a special characteristic of the planet Mars?
Answer:
The highest and the longest mountain in the solar system ‘Olympus Mons’ is located on Mars.

Question b.
What are the type of galaxies?
Answer:
The different types of galaxies identified according to their shapes are spiral, elliptical, barred spiral, irregular.

Question c.
Which celestial bodies does a galaxy include?
Answer:
Galaxy includes stars, their planetary system, cluster of stars, nebulae, clouds of gases, clouds of dust, dead stars, newly bom stars etc.

Question d.
Name the different types of stars.
Answer:
The different types of stars are

1. Sun-like stars e.g. stars like Sirius, Alpha Centauri
2. Red Giants Stars
3. Super Nova
4. Binary or Twin Stars
5. Variable Stars e.g. Polaris (pole star)

Question e.
What are the types of comets and on what basis are they classified?
Answer:

1.  Comets are of two types: Long-period comets and short-period comets.
2. Classification of comets is based on the time (period) taken by the comets to complete one revolution around the sun.

Question f.
What is the difference between meteors and meteorites?
Answer:

1. Meteors are rocky pieces originating from the asteroid belt. Smaller rocky pieces get completely burnt due to friction with air after they enter the earth’s atmosphere.
2. Meteors which do not bum completely and fall to the surface of the earth are called meteorites.

Question g.
What are the characteristics of the planet Neptune?
Answer:
Neptune is the eighth planet in the solar system. A season on Neptune lasts for about 41 years. On this planet winds blow with extremely high speed.

5. Match the following.

Question a.

Group ‘A’	Group ‘B’
1. Galaxy	(a) From east to west
2. Comet	(b) 33 satellites
3. Sun-like star	(c) Spiral
4. Saturn	(d) Sirius
5. Venus	(e) Halley

Answer:

Group ‘A’	Group ‘B’
1. Galaxy	(c) Spiral
2. Comet	(e) Halley
3. Sun-like star	(d) Sirius
4. Saturn	(b) 33 satellites
5. Venus	(a) From east to west

Activity:

Question 1.
Using the material you can find in your house, prepare a model of the solar system.

Question 2.
Collect information about different aspects of each planet such as its distance from the sun, its diameter, its volume, etc. and present it in a science exhibition.

Class 6 Science Chapter 16 The Universe Important Questions and Answers

Fill in the blanks.

Question 1.
The Milky Way is known as ………….. .
Answer:
Mandakini

Question 2.
The ………….. is a galaxy in which our solar system is located.
Answer:
Milky Way

Question 3.
The galaxy that is closest to our Milky Way is ………….. .
Answer:
Andromeda

Question 4.
The universe includes innumerable galaxies, the space between them and also ………….. .
Answer:
energy

Question 5.
The Milky Way is a part of the ………….. of galaxies.
Answer:
Local group

Question 6.
Generally, the surface temperature of stars ranges from 3500° C to ………….. .
Answer:
50000°C

Question 7.
The colour of stars changes according to their ………….. .
Answer:
temperature

Question 8.
Red giants stars are ………….. in colour.
Answer:
red

Question 9.
Super Nova stars are ………….. and ………….. than the red giant stars.
Answer:
brighter, larger

Question 10.
More than ………….. of the stars in the sky are ………….. stars.
Answer:
half, binary

Question 11.
The ………….. and ………….. of variable stars is not stable.
Answer:
luminance, shape

Question 12.
When a star contracts, its surface temperature ………….. and the star emits ………….. energy and appears ………….. .
Answer:
increases, greater, brighter

Question 13.
The sun which is at the centre of the solar system is a ………….. coloured star.
Answer:
yellow

Question 14.
The diameter of the sun is approximately ………….. km.
Answer:
13, 92, 000

Question 15.
………….. is the fastest moving planet.
Answer:
Mercury

Question 16.
………….. is the brightest planet in the solar system.
Answer:
Venus

Question 17.
………….. is the hottest planet.
Answer:
Venus

Question 18.
As the earth is a ………….. there is a magnetic field around the earth.
Answer:
magnet

Question 19.
Mars is also called the ………….. .
Answer:
Red planet

Question 20.
As the soil on Mars contains ………….. its colour is reddish.
Answer:
iron

Question 21.
………….. planets of the size of the earth can get accommodated on Jupiter.
Answer:
1397

Question 22.
Jupiter is called as ………….. .
Answer:
The stormy planet

Question 23.
Saturn mass is ………….. times that of the earth.
Answer:
95

Question 24.
………….. cannot be seen without a telescope.
Answer:
Uranus

Question 25.
Winds blow with extremely high speed on ………….. .
Answer:
Neptune

Question 26.
………….. is the satellite of the earth.
Answer:
The moon

Question 27.
The moon’s period of ………….. and ………….. are both of 27.3 days.
Answer:
rotation, revolution

Question 28.
………….. is classified as a dwarf planet.
Answer:
Pluto

Question 29.
Pluto takes ………….. years to complete its revolution around the sun.
Answer:
248

Question 30.
………….. are formed out of ice and dust particles.
Answer:
Comets

Question 31.
………….. lake in Maharashtra has been formed by the impact of such a meteorite.
Answer:
Lonar

Can you tell?

Question 1.
Which celestial bodies form the solar system?
Answer:
Sun, the eight planets – Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, their satellites, Dwarf planets, asteroids, meteors and comets all together form our solar system.

Question 2.
What is the difference between stars and planets?
Answer:

Stars	Planets
1. Stars are the celestial bodies which can emit heat and light continuously.	1. The celestial bodies which revolve around the sun in certain orbit are called planets.
2. Stars twinkle in the sky.	2. Planets do not twinkle in the sky.
3. They have their own light.	3. They do not have their own light.
4. They are fixed at a point.	4. They revolve around the sun.
5. They are very big in size.	5. Planets are small as compared to

Question 3.
How many planets are there in our solar system?
Answer:
There are 8 planets in our solar system.

Question 4.
What is to be found between Mars and Jupiter?
Answer:
A belt of celestial bodies called as asteriods is found between the planets Mars and Jupiter.

Question 5.
Have you ever seen in the evening or in the pre-dawn hours a large celestial body with a long tail? What is it called?
Answer:
Yes, it is a comet – a large celestial body with a long tail. I have not seen it, but heard that in 1986 there was a Halley’s comet seen in the Indian sky.

Use your brain power!

Question 1.
Why do we see only one side of the moon?
Answer:
As the moon revolves around the earth it also rotates around itself. The moon takes 27.3 days to complete one revolution around the earth. It takes the moon the same time to complete one rotation around itself. Therefore, only one side of moon is visible.

Question 2.
Which planet has a day longer than its year?
Answer:
A planet’s day is how long it takes to complete one rotation on its own axis. Venus takes 243 earth days to complete one rotation because of its slow rotation around its axis. A year is the time taken by the planet to complete one revolution around the sun. Venus completes one revolution around the sun in 225 days. This makes a day longer than a year on Venus.

Answer in one sentence.

Question 1.
What is the Milky Way?
Answer:
Milky way is the galaxy in which our solar system is located.

Question 2.
What is a galaxy?
Answer:
A group of innumerable stars and their planetary systems are together known as galaxy.

Question 3.
What does the Universe include?
Answer:
The universe includes innumerable galaxies, the space between them and also energy.

Question 4.
What different colours do the stars radiate?
Answer:
The stars radiate different colours such as blue, white, yellow and red.

Question 5.
Where are stars bom?
Answer:
The birth place of stars are the huge nebulae, made of dust particles and gases.

Question 6.
What is the surface temperature of the sun?
Answer:
The surface temperature of the Sim is around 6,000°C.

Question 7.
What is the size of the sun?
Answer:
The size of the sun is so huge that around 13 lakh planets of the size of the earth can be easily placed within it.

Question 8.
How does the sun balance the other celestial bodies?
Answer:
Due to the gravitational force of the sun, the celestial bodies in the solar system revolve around it.

Question 9.
How does the sun move in the Milky Way?
Answer:
The sun rotates around its axis and while doing so, it revolves around the centre of the Milky Way taking the solar system along with it.

Question 10.
Which planet doesn’t have atmosphere?
Answer:
Mercury doesn’t have atmosphere.

Question 11.
How much time does the earth take to complete one rotation and one revolution?
Answer:
The earth completes one rotation in 24 hrs and one revolution in 365 days i.e. 1 year.

Question 12.
Which planets have rings around them?
Answer:
Jupiter, Saturn, Uranus, Neptune have rings around them.

Question 13.
Which planet do not have rings around them?
Answer:
Mercury, Venus, Earth and Mars do not have rings around them.

Question 14.
State two properties of planet Mercury.
Answer:
Mercury is the closet planet to the Sim. Mercury is the fastest moving planet.

Question 15.
When is the Mercury visible to us?
Answer:
Mercury is visible in the morning and in the evening if it is away from the sun.

Question 16.
What is seen on the surface of the mercury?
Answer:
A number of depressions which are actually caused by meteoric falls are seen on the surface of mercury.

Question 17.
When is Venus seen in the sky?
Answer:
Venus is seen in the sky in the east before the sunrise and in the west after the sunset. It rotates around itself from east to west.

Question 18.
How does earth protect us from harmful rays of Sun?
Answer:
As the earth is a magnet there is a magnetic field around the earth. It diverts the harmful rays from the sun towards the polar regions of the earth.

Question 19.
What is Olympus Mons?
Answer:
Olympus Mons is the highest and longest mountain in the solar system located on Mars.

Question 20.
Which is the largest planet of the solar system?
Answer:
The Jupiter is the largest planet of the solar system.

Question 21.
Why is Saturn considered a peculiar planet?
Answer:
Saturn considered a peculiar planet because of the rings around it.

Question 22.
How is the axis of Uranus?
Answer:
Uranus axis is so greatly inclined that it appears as if it is rolling along on its axis.

Question 23.
How are seasons on Neptune?
Answer:
The seasons on Neptune last for about 41 years.

Question 24.
What is a satellite?
Answer:
The celestial bodies that revolve around a planet , without independently revolving around the sun are called Satellite.

Question 25.
What is an Asteroid?
Answer:
A great number of small sized bodies could not turn into planets when the solar system was formed, but continued to revolve around the sun. This bodies are known as asteroids.

Question 26.
What is a Dwarf Planet?
Answer:
A small sized celestial body that revolves independently around the sun is called the dwarf planet.

Question 27.
What is a comet?
Answer:
A comet is a celestial body that revolves around sun. Comets are formed out of ice and dust particles.

Question 28.
What are meteors?
Answer:
Meteors are rocky pieces originating from the asteroids belt.

Question 29.
What are meteorites?
Answer:
Meteors which do not bum completely and fall to the surface of the earth are called meteorites.

Give reasons for the following.

Question 1.
Comets came to be called ‘dirty snowballs’.
Answer:
Comets consist of an icy cluster of various constituents like dust particles. Hence it is called dirty snowballs.

Question 2.
Comets are visible when they are close.
Answer:
Comets are formed out of ice and dust particles. They appear like points when they are far away from the sun, but when they are close to the sun they become easily visible to us because of the shorter distance and the heat of the sun.

Question 3.
Comets appear to have a long feathery tail.
Answer:
Comets are made up of frozen matter and dust particles. When they are close to the sun this frozen matter gets converted into gas due to the solar heat. These gases get thrown in a direction away from the sun. As a result comets appear to have a long feathery tail.

Question 4.
Pluto is called as a dwarf planet.
Answer:
Pluto is a small sized celestial body that revolves independently around the sun.

Question 5.
Moon is a satellite of the earth.
Answer:
Moon revolves around the earth without independently revolving around the sun. Hence moon is a satellite of the earth.

Question 6.
Mars is called the Red Planet.
Answer:
As the soil on the Mars contains iron its colour is reddish. Hence Mars is also called the RedPlanet.

Question 7.
Jupiter is called the Stormy Planet.
Answer:
Jupiter revolves around itself with a great speed. Hence Jupiter is called the Stormy planet.

Question 8.
Uranus appears rolling along on its orbit.
Answer:
Uranus axis is so greatly inclined that it , appears as if it is rolling along on its orbit.

Question 9.
Saturn is considered to be a peculiar planet.
Answer:

1. Saturn is considered as peculiar planet because of its rings around it.
2. Though its mass is 95 times that of the earth, its density is very low.
3. If it were dropped into a large sea enough to hold it, it would float in it.

Balbharti Maharashtra State Board Class 8 English Solutions Chapter 1.2 Dick Whittington and his Cat Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 8 English Solutions Chapter 1.2 Dick Whittington and his Cat

Class 8 English Chapter 1.2 Dick Whittington and his Cat Textbook Questions and Answers

Warming Up:

1. Discuss the follow in groups and write the answers:

Question a.
Name the world famous personalities, who reached great heights despite of humble circumstances.
Answer:

• Dr. A.P.J. Abdul Abraham
• Lincoln Kalam
• Charlie Chaplin
• Kalpana Chawla

Question b.
Guess the types of hardships they must have faced in their childhood and youth.
Answer:

• poverty
•  lack of support
• social disapproval
• lack of opportunities

Question c.
What strong qualities possessed by them, could have helped them achieve success and fame, all over?
Answer:

• strong will power
• optimism
• sincerity
• hard work

Question d.
How do stories / biographies of such famous people help youngsters?
Answer:

• They help youngsters to look at life positively.
• They inspire the youth.
• They help them find answers to questions.
• They prove that we can do many seemingly impossible things if we really wish to.

2. Syllable: A syllable is a unit of pronunciation that has one ‘owe1 sound and may or may not have consonant sounds before I after it.
Examples of words having:
One syllable: a, I, see, at, on, man, with, thread
Two syllables: mother, seated, giraffe, parrot, active, happy
Three syllables: happiness, wonderful, animal, surprising, adventure, ignorance.
More than three syllables: consequently, encouragement, responsibility, identifying, encyclopedia

Write the numcs of any 5 of your classmates and list how many syllables each name has.
Answer:

• Jal: 1 syllable
• Remo: 2 syllables
• Saira: 2 syllables
• Shailaja : 3 syllables
• Mandakini: 4 syllables
• Ali: 2 syllables

1. A. Arrange the following set of words in alphabetical order in your notebook.
ship, small, successful, scoldings, stone, saving, someone, stood, streets, still, screamed, sot, seemed, saint, share.
Answer:
saint, sat, saving, scoldings, screamed, seemed, share, ship, small, someone, still, stone, stood, streets, successful.

1. B. Remove the Affixes (Prefix and Suffix) and write the Root-word.

1. successful
2. immediately
3. retrace
4. mouser
5. unfriendly
6. fallen
7. unkind
8. wooden
9. luckily
10. belonging

Answer:

1. success
2. immediate
3. trace
4. mouse
5. friendly
6. fall
7. kind
8. wood
9. luck
10. belong

2. A. Find from the story’ one word for the following.

Question a.
a small room just below a sloping roof
Answer:
attic

Question b.
a very narrow passage between buildings
Answer:
alley

Question c.
the highest – ranking officer in the Municipality of a city/town.
Answer:
Mayor

Question d.
the highest ranking official who commands a ship.
Answer:
Captain

Question e.
any animal that catches mice
Answer:
mouser

Question f.
a low constant sound made by cats
Answer:
Purr

2. B. Make sentences of your own using the following expressions.

Question 1.
overcome:
Answer:
We must learn to overcome any difilcultics we come across.

Question 2.
put up with:
Answer:
We had to put up wilhi the noisy behaviour of our neighbours son.

Question 3.
bargain:
Answer:
People In India love to bargain with hawkers.

3. Rearrange the following events us they occur in the story. Put the correct number in the boxes.

Answer:

4. Think and answer:

Question 1.
What decision taken by Dick changed his fortune?
Answer:
On hearing the church bells send out a message to him, Dick decided to retrace his steps and go back to Mr. Fitzwarren’s house instead of running away. This decision changed Dick’s fortune.

Question 2.
What message does this story bring j out for youngsters?
Answer:
The message that this story brings out for youngsters is that we must S not run away from difficulties but face > them bravely.

5. A. Break the words below into syllables us shown in the first one.

1. belonging
2. morning
3. unfriendly
4. citizen
5. anything
6. message
7. difficulty
8. mayor
9. captain
10. elected

Answer:

1. be – long – ing
2. mor – ning
3. un – friend – ly
4. ci – ti – zen
5. an – y – thing
6. mess – age
7. di – ffi – cul- ty
8. ma – yor
9. cap – tain
10. e – lec – ted

5. B. Degrees of Comparison of Adjectives.

Read the sentences.

(i) Yatin is strong.
(ii) Amit is stronger than Yatin.
(iii) Pruvin is the strongest of all.

In sentence (i) the Adjective ‘strong’ is in its simple form. It is called Positive Degree.
In sentence (ii) the Adjective stronger’ refers to a higher degree, when there is a comparison of two nouns. It is called Comparative Degree. (-er is
added to the basic Adjective)
In sentence (iii) the adjective ‘strongest’ refers to the highest degree of comparison of one with more than two nouns. It is called Superlative
Degree. (-est is added to the basic Adjective)

Complete the table of degrees of comparison.

Answer:

Positive	Compa­rative	Super­lative
(1) great	greater	greatest
(2) famous	more famous	most famous
(3) easy	easier	easiest
(4) bad	worse	worst
(5) poor	poorer	poorest
(6) lazy	lazier	laziest
(7) little	less	least
(8) worthy	worthier	worthiest
(9) popular	more popular	most popular

6. Select any one of the famous personalities mentioned in ‘Warming up 1′ on page no. 5. From the library or internet find out their success story. Write ¡tin your own words in about 20 to 30 lines of your notebook. Give your write-up a suitable title.

Class 8 English Chapter 1.2 Dick Whittington and his Cat Additional Important Questions and Answers

Simple Factual Activities :

Complete the following :

Question 1.
Dick lived in a ______.
Answer:
small village in the south of England

Question 2.
_____ treated Dick unkindly.
Answer:
Many of the villagers

Question 3.
The innocent belief ________.
Answer:
that the streets of London were paved with gold made Dick decide to go to London

Question 4.
The carter asked Dick _______.
Answer:
if he was running away from home

Complex Factual Activity:

Question 1.
Describe the hardships that Dick I faced on arriving in London.
Answer:
Dick arrived in London just before ; nightfall. He had no place to sleep, and he finally slept in the corner of a narrow lane. The following morning, Dick woke ( up feeling cold, miserable and hungry. He j begged for food, but people shouted at him | and hit him angrily on his head. He finally collapsed and lay there, too weak to look further for food.

Activities based on Contextual Grammar:

Question 1.
He thought people might treat him more kindly if he were rich. (Identify the modal auxiliary and state its function.)
Answer:
might-indicates possibility

Question 2.
All he could see were dirty streets and lots of unfriendly people.
(Rewrite using ‘nothing’.)
Answer:
He could see nothing but dirty streets and lots of unfriendly people.

Personal Response:

When Dick begged for food, people shouted at him and beat him. Do you think this is right?
Answer:
of course it is not right. We ; should have sympathy when people beg for something, not get angry with them. They must be having a strong reason for begging, of course, if they are lazy, do not work and then beg, it is wrong. Even then, we must not beat them or shout at them.

Complete the following:

Question 1.
Mr. Fitzwarren favoured Dick by ______.
Answer:
ordering the cook to take him into the kitchen, feed him and then find some work for him

Question 2.
Dick had to face two difficulties in Mr. Fitzwarren’s house. They were:
Answer:
(i) the attic where he slept was overrun by rats and mice, preventing him from sleeping.
(ii) the cook was bad-tempered and shouted and screamed at Dick, scolding him and hitting him with a wooden spoon even when he was working as hard as he could.

Question 3.
The cat proved to be very useful because _____.
Answer:
it chased away all the rats and mice, allowing Dick to sleep peacefully

Activities based on Contextual Grammar:

Question 1.
Dick had fallen in front of a house belonging to a rich merchant. (Rewrite using the simple past tense of the underlined verb.)
Answer:
Dick fell in front of a house belonging to a rich merchant.

Question 2.
Dick was able to sleep peacefully.
(Rewrite using the verb ‘slept’.)
Answer:
Dick slept peacefully.

Personal Response:

Question 1.
What do Mr. Fitzwarren’s actions tell us about him?
Answer:
Mr. Fitzwarren’s actions tell us that he was a kind-hearted and just man.
He did not abuse Dick or hit him as the others had done. He offered Dick a home and a living in return for helping the cook with all the pots and pans in the kitchen.

Simple Factual Activities:

Who said the following words:

Question 1.
I can put up with a few scoldings from the cook.
Answer:
Dick

Question 2.
No, it must be his.
Answer:
Mr. Fitzwarren

Question 3.
Only my cat.
Answer:
Dick

Question 4.
Let me put something in for him.
Answer:
Alice

Fill in the blanks:

Question 1.
Dick walked as far as ________.
Answer:
Holloway

Question 2.
The first of November is _______.
Answer:
All Saints’ Day

Question 3.
Dick went back to _____.
Answer:
Mr. Fitzwarren’s house

Question 4.
Mr. Fitzwarren was sending a ship to the _____ to trade.
Answer:
African coast

Complex Factual Activity:

Question 1.
’“Explain in your own words what inspired Dick to return to Mr. Fitzwarren’s home.
Answer:
When Dick sat down on a stone to rest, he heard the church bells ringing. As he listened, it seemed that they were ringing a message for him, telling him that he should go back home, and calling him the Mayor of London.

Pick out the subject and predicate in the following sentences and put them in the correct columns in the table given below :

1. You can then share in the profits.
2. Everyone produced something except for Dick.
3. The two of them walked as far as Holloway.
4. Dick and his cat retraced their steps to Mr. Fitzwarren’s house.

Answer:

Subject	Predicate
(1) You	can then share in the profits
(2) Everyone	produced something except for Dick
(3) The two of them	walked as far as Holloway
(4) Dick and his cat	retraced their steps to Mr. Fitzwarren’s house.

Personal Response:

Question 1.
According to you, did Dick do the right thing by running away from Mr. Fitzwarren’s house because of the cook?
Answer:
No, I don’t think that Dick did the right thing. Mr. Fitzwarren was a good man, and Dick was making a decent living. He should have tried to win the cook over and solve his difficulties. If he had run away, he may not have got another job and may have had to beg. Nothing is gained by running away from problems; we must face them and solve them.

Write whether the following statements are True or False:

Question 1.
Dick was happy to send his cat on the ship.
Answer:
False

Question 2.
The cat caught plenty of mice and rats.
Answer:
True

Question 3.
The king was rude to the captain.
Answer:
False

Question 4.
The queen knew all about cats.
Answer:
False

Pick out two adverbs ending in ‘-ly’ from the passage, and write the adjectives in them.
Answer:
Adverbs-immediately, normally, Adjectives in them-immediate, normal

Personal Response:

Do you think that all the animals are 1 important to the environment?
Answer:
Yes, all the animals are certainly j important to the environment. They all have their own place and own duties. ; For example, hawks and eagles control the population of mice, rats and snakes. Lions and tigers keep the number of deer, buffaloes and other such animals in check, j Every animal is important in its own way.

Write the following sentences in the correct order of occurrence in the passage:

1. Dick was knighted by the king and became Sir Richard Whittington.
2. Dick was elected the Mayor of London.
3. The king paid ten times the sum for the cat.
4. “I would give great wealth to own this animal,” said the queen.

Answer:

1. “I would give great wealth to own this animal,” said the queen.
2. The king paid ten times the sum for the cat.
3. Dick was elected the Mayor of London.
4. Dick was knighted by the king and became Sir Richard Whittington.

Give reasons:

Question 1.
The queen was afraid of the cat.
Answer:
The queen was afraid of the cat because she had seen how fiercely it had attacked the rats and the mice.

Question 2.
How much did the king pay for the cat?
Answer:
The king paid ten times the sum for the cat that he had paid for the whole cargo from Mr. Fitzwarren’s ship.

Activities based on Contextual Grammar :

Pick out the verbs from the following sentences and state their tense :

Question 1.
The captain showed Mr. Fitzwarren the gold and jewels he had brought from Barbary.
Mr. Fitzwarren then paid him all: the money he had received for the cat.
Answer:
showed – simple past tense; had brought – past perfect tense
paid – simple past tense; had received – past perfect tense

Personal Response:

Question 1.
What message does this story bring j out for youngsters?
Answer:
The message that this story brings out for youngsters is that we must S not run away from difficulties but face > them bravely.

Do as directed:

Question 1.
Pick out two compound words from the lesson.
Answer:
Two compound words : household, nightfall

Question 2.
Use the adverb ’immediately’ in your own sentence :
Answer:
The teacher immediately asked the tired girl to sit down.

Question 3.
Find out four hidden words from : the given word : (Each word should have at least 3 letters.)
successful
Answer:
successful : success, self, fuel, fuse

Question 4.
Use the following word and its homophone in two separate sentences :ate
Answer:

• The little boy ate the cake very quickly,
• He was eight years old when he got a new cycle.

Question 5.
Underline the adjectives from the following sentence :
He was not only famous, but he was popular too, for he always helped the poor ; with his money.
Answer:
He was not only famous, but he was popular too, for he always helped the poor with his money.

Question 6.
Pick out the conjunction in the following sentence :
Dick work up cold, miserable and very hungry.
Answer:
and

Question 7.
Punctuate :
alas yes came the reply the country is suffering from a plague of rats and mice
Answer:
“Alas, yes!” came the reply. “The country is suffering from a plague of rats and mice.”

Question 8.
Pick out the direct and indirect objects:
He gave me a hundred rupee note.
Answer:
Direct object – a hundred-rupee note
Indirect object – me

Question 9.
Use the following word as a noun and a verb in two separate sentences :
sleep
Answer:

• We should get at least 8 hours of sleep daily, (noun)
• I sleep at 10 pm daily, (verb)

Balbharti Maharashtra State Board Class 6 Science Solutions Chapter 6 Substances in Daily Use Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 6 Science Solutions Chapter 6 Substances in Daily Use

Class 6 Science Chapter 6 Substances in Daily Use Textbook Questions and Answers

1. Fill in the blanks using proper works:

Question a.
Rubber made by vulcanization is a …………… material.
Answer:
hard

Question b.
Man-made materials are made by …………… natural materials.
Answer:
processing

Question c.
…………… thread was developed simultaneously in New York and London.
Answer:
Nylon

Question d.
Rayon is also known as …………… .
Answer:
synthetic silk

2. Answer the following questions. 

Question a.
Why did the need for man-made materials arise?
Answer:
The need for man-made materials arose due to the following reasons:

1. To meet the needs of an increasing population.
2. Human nature to try to make life more comfortable.
3. They can be made available in plenty at a low cost.
4. The reserve of natural substances is decreasing.

c

Question b.
Which are the natural materials obtained from plants and animals?
Answer:
Leather, jute, wool, cotton, silk are the natural substances obtained from plants and animals.

Question c.
What is vulcanization?
Answer:

1. Vulcanization is the process in which rubber is heated with sulphur for three to four hours.
2. Sulphur is mixed to give hardness to rubber.
3. The proportion of sulphur depends on the purpose for which the rubber is to be used.

Question d.
Which natural materials are used to obtain fibres?
Answer:
Cotton, wood pulp and various hydrocarbons obtained from mineral oils are used to obtain fibres.

3. What are we used for?

Question a.
What are we used for?
Answer:

1. Soil: It supports plant life and hence indirectly supports all living things. It is used for making clay pot, utensils, bricks etc.
2. Wood: It is used in paper industry. It is also used to make furniture.
3. Nylon: It is used to manufacture clothes, fishing nets, ropes, etc.
4. Paper. It is used in our textbooks, note books, currency notes, etc.
5. Rubber: It is used in the manufacture of erasers, tyres, rubber toys, rubber bands, etc.

4. How is paper manufactured? Write in your own words.

Question a.
How is paper manufactured? Write in your own words.
Answer:
Coniferous trees like pine trees are used to make paper.

1. The bark of the logs of these trees is first removed and the wood is broken into small pieces.
2. The mixture of these pieces with some chemicals is kept soaked for a long time to form pulp.
3. On completion of chemical process, fibrous substances from wood pulp are separated and some dyes are added.
4. The pulp is then passed through rollers, dried to form paper and finally wound on reels.

5. Give scientific reasons.

Question a.
We must use cotton clothes during summer.
Answer:

1. During summer we sweat more due to high temperature.
2. Cotton clothes absorb sweat.
3. Synthetic clothes are water repellent. They do not absorb sweat and we feel uncomfortable. Hence we must use cotton clothes in summer.

Question b.
We must observe economy in the use of materials.
Answer:

1. Due to excessive use of natural substances by human beings to fulfil their needs; they are getting depleted at a faster rate.
2. At the same time, it takes a very long time for these substances to get naturally formed again.
3. Hence, we must observe economy in the use of materials so that they are available for the future generation also.

Question c.
Saving paper is the need of the hour.
Answer:

1. Saving paper means saving trees as wood is used as the raw material to manufacture paper.
2. Trees are natural habitat for many Living things.
3. Trees help in increasing rainfall and water availability. Hence, saving paper helps in saving trees which in turn maintains balance in nature.

Question d.
Man-made materials have more demand.
Answer:

1. Man-made substances are waterproof, lightweight and easy for transportation.
   Substances in Daily Use
2. They are easier to use and can be made available in plenty at a low cost.
   Hence, there is more demand for man-made materials.

Question e.
Humus is a natural material.
Answer:

1. Humus is obtained from plant and animal wastes.
2. Micro-organisms act on these wastes and convert them into humus.
3. Hence, humus is a natural material.

6. Find out.

Question 1.
How is lac obtained from nature?
Answer:

1. Lac is a resinous substance secreted from the glands present in the skin of female lac insect.
2. Lac insects live on the Palash trees. In India lac is mainly produced in the states of Rajasthan and Bihar.

Question 2.
How are pearls obtained?
Answer:

1. Pearls are formed when a foreign particle such as a grain of sand or a small particle of rock accidentally enters the space between the mantle and shell of an oyster’s body.
2. Oysters cannot reject the particle, and as a defence mechanism its produces a shining coating called nacre on the particle layer by layer.
3. As the shiny layers get added, a pearl is formed.
4. Cultured pearls are artificially formed by inserting a bead in oyster shell and allowed to coat it with nacre over several years.

Activity:

Question 1.
Visit a rubber, paper or textile industry in your area and collect information about it.

Question 2.
Collect various samples of paper and note their uses.

Question 3.
Use blank pages from old note-books and make a new one.

Class 6 Science Chapter 6 Substances in Daily Use Important Questions and Answers

Fill in the blanks using proper works.

Question 1.
Natural rubber is obtained from …………… of trees.
Answer:
latex

Question 2.
Changes where the original constituent substances cannot be obtained again from the new substances are called …………… changes.
Answer:
irreversible

Question 3.
A paper factory in Maharashtra is situated at …………… .
Answer:
Ballarpur

Question 4.
Glass can be made from …………… and …………… .
Answer:
sand, calcium

Question 5.
Botanical name of rubber plant is …………… .
Answer:
Hevea brasiliensis

Question 6.
…………… obtained from mineral oils are used to make polymer chains.
Answer:
Hydrocarbons

Question 7.
The maximum production of rubber in India is in …………… .
Answer:
Kerala

Question 8.
…………… invented the process of vulcanisation.
Answer:
Charles Goodyear

Match the columns:

Question 1.

Column ‘A’	Column ‘B’
1. Jute	a. Animal origin
2. Air	b. Plant origin
3. Leather	c. Man-made
4. Cement	d. Abiotic

Answer:

Column ‘A’	Column ‘B’
1. Jute	b. Plant origin
2. Air	d. Abiotic
3. Leather	a. Animal origin
4. Cement	c. Man-made

State whether the following statements are ‘true’ or ‘false’.

Question 1.
We can find plastic in nature.
Answer:
False

Question 2.
Soap is a man-made substance.
Answer:
True

Question 3.
We should reuse available resources.
Answer:
True

Question 4.
Nylon clothes are good summer wear.
Answer:
False

Question 5.
Glass is a man-made substance.
Answer:
True

Question 6.
In irreversible changes original substances can be obtained again.
Answer:
False

Question 7.
Rayon is made up of cotton and wood pulp.
Answer:
True

Give two examples of each of the following:

Question 1.
Natural fibres
Answer:
cotton, silk

Question 2.
Synthetic fibres
Answer:
terylene, rayon

Question 3.
Biotic natural substances
Answer:
wool, jute

Question 4.
Abiotic natural substances
Answer:
air, water

Question 5.
Man-made substances.
Answer:
paper, glass

Classify the following substances in the table given below.
(iron, wood, brick, paper, terylene, stone, jute, air, silk, utensils, plastic, rayon, water, wool, dacron, lac, nylon, pearl)
Answer:

Natural Substances	Man-made Substances               Natural Fibres		Synthetic Fibres
iron, wood, stone, water, lac, pearl	brick, paper, utensils, plastic	jute, silk, wool	terylene, rayon, dacron, nylon

Define:

Question 1.
Natural substances.
Answer:
Substances available in nature are called natural substances.

Question 2.
Man-made substances.
Answer:
Man-made substances are new substances produced by processing naturally available resources.

Question 3.
Biotic substances.
Answer:
Natural substances obtained from living things are called biotic substances.

Question 4.
Abiotic substances.
Answer:
Natural substances that are not obtained from living things are called abiotic substances.

Question 5.
Plant-originated substance.
Answer:
A substance obtained from a plant is called a plant-originated substance.

Question 6.
Animal-originated substance.
Answer:
A substances obtained from an animal is called an animal-originated substance.

Question 7.
Hydrocarbons.
Answer:
Substances obtained from mineral oil are called hydrocarbons.

Answer the following in one or two sentences.

Question 1.
Why was Rayon named so?
Answer:
The threads of Rayon have shine and strength. They appeared to be shining bright like the sun’s rays. Hence, they were named ‘Rayon.

Question 2.
How are TV sets, refrigerators, etc. packed? Why?
Answer:
To pack TV sets, refrigerators, etc. big cartons and thermocol are used. These man-made substances are water resistant, light weight and easy for transportation.

Question 3.
Give the properties and uses of nylon.
Answer:
Nylon threads have a shine and are strong, transparent and water resistant. They are used to manufacture clothes, fishing nets, ropes, etc.

Question 4.
What is latex?
Answer:
Latex is a milky white natural substance produced in the stems of rubber trees.

Question 5.
Name the basic material used to obtain paper.
Answer:
Wood is the basic material used in the manufacture of paper.

Question 6.
What kind of paper is used for currency notes manufacturing?
Answer:
Flax fibre is used in the manufacture of currency notes.

Question 7.
Where was the process of making paper invented?
Answer:
The process of making paper was invented in China.

Answer in brief:

Question 1.
What are the advantages of synthetic fibre?
Answer:
Advantages of synthetic fibre are:

1. These fibres can be manufactured on a large scale.
2. They cost less.
3. They are strong and durable.
4. They can be used for a long time.
5. They are water repellent. They dyy easily.
6. They are light weight and comfortable to wear.
7. Clothes made from these threads are wrinkle free and scratch free.

Question 2.
Give the shortcomings of synthetic fibre.
Answer:

1. They are water repellent. Hence, they do not absorb sweat from the skin.
2. Continuous use of these clothes keeps the skin moist which may cause skin diseases.
3. Synthetic clothes are uncomfortable to wear especially in summer.
4. They catch fire easily.
5. If they catch fire, they stick to the skin and cause skin injuries.
6. These fibres are not decomposed by micro-organisms.

Question 3.
Write a short note on natural rubber.
Answer:

1. Rubber is a natural substance obtained by collecting the latex of certain trees.
2. The botanical name of this tree is ‘Hevea brasiliensis’
3. In India, the maximum production of rubber is in Kerala.

Question 4.
What are dacron, terylene and terene?
Answer:

1. Dacron, terelyne and terene are synthetic fibres prepared from hydrocarbons.
2. Various hydrocarbons obtained from mineral oil are used to make polymer chains.
3. A solution of such polymer is pressed through a strainer with fine holes.
4. The fibre formed after cooling are long and unbroken threads.
5. These threads have been named as dacron, terylene and terene.

Give scientific reasons:

Question 1.
Natural substances are depleting.
Answer:

1. Due to increase in population there is an increase in demand. To meet this demand, natural substances are used to a greater extent.
2. Due to human nature to make his life more comfortable, he learnt to use natural resources and also began to process them to make new substances. Hence natural substances are depleting at an alarming rate.

Can you tell?

Question 1.
Difference between leather, jute, wool, cotton and soil, water, metals.
Answer:

1. Leather, jute, wool are biotic natural substances.
2. Soil, water, metals are abiotic natural substances.

Question 2.
How are leather and wool different from jute and cotton?
Answer:
Leather and wool are obtained from animals while jute and cotton are obtained from plants.

Question 3.
Do you find plastic, nylon, brass or cement in nature?
Answer:
No, they are all man-made materials.

Question 4.
Can red chillies become green chillies again?
Answer:
No, the change from green chillies to red chillies is irreversible.

Question 5.
From which substances in nature can we get threads or fibre?
Answer:
Cotton plant, jute, silkworm.

Question 6.
What are clothes made from?
Answer:
Clothes are made from yarn obtained from fibre.

Classify the following substances according to their uses:
sand, soap, wool, window glass, bamboo, cotton, bricks, silk, leafy vegetables, cement, fruits, water, sugar.
Answer:

• For construction: Sand, window glass, bamboo, bricks, cement.
• As food: Leafy vegetables, fruits, water, sugar.
• At home: Soap for cleaning.
• For clothes: Wool, cotton, silk.

Make a list of objects, each of which can be made from several substances.
Answer:

Objects	Substances
Table	Wood, glass, plastic.
Toys	Wood, plastic, clay.
Utensils	Aluminium, wood, glass, ceramic, plastic.

Use your brain power!

Question 1.
Complete the table below, showing how substance of daily use are classified.

Answer:

1. Natural
2. Biotic
3. Cement
4. Animal Origin
5. Cotton

Balbharti Maharashtra State Board Class 7 Science Solutions Chapter 20 In the World of Stars Notes, Textbook Exercise Important Questions and Answers.

Maharashtra State Board Class 7 Science Solutions Chapter 20 In the World of Stars

Class 7 Science Chapter 20 In the World of Stars Textbook Questions and Answers

1. Write the proper words in the blanks:
(meridian, horizon, twelve, nine, apparent, celestial, ecliptic)

Question a.
When seen from a great distance, the sky seems to be touching the ground along a circle. This circle is called the …………… .
Answer:
horizon

Question b.
The ………….. is used while defining the zodiac sign.
Answer:
meridian

Question c.
Classified according to seasons, one season will have ………… nakshatras.
Answer:
nine

Question d.
The rising of the sun in the east and its setting in the west is the ………. motion of the sun.
Answer:
apparent

2. A star rises at 8 pm. tonight. At what time will it rise after a month? Why?

Question a.
A star rises at 8 pm. tonight. At what time will it rise after a month? Why?
Answer:

1. Str s rise and set 4 minutes earlier every day. If star rises at 8 pm tonight, it will rise at 7:56 pm tomorrow.
2. It will rise at 5:24 pm after a month.
3. The sun and the moon are seen to move from the west to the east against the background of stars.
4. The sun moves through one degree every day and the moon through 12 to 13 degrees.
5. This happens due to the motion of the earth around the sun and the moon around the earth which affects the duration of the stars and shortens its time period.

3. What is meant by “The sun enters a nakshatra?” It is said that in the rainy season the sun enters the mrug nakshatra. What does it mean?

Question a.
What is meant by “The sun enters a nakshatra?” It is said that in the rainy season the sun enters the mrug nakshatra. What does it mean?
Answer:

1. When we look at the sun we see not only the sun but also constellation behind the sun.
2. The constellation cannot be seen in bright sunlight but it is indeed present behind the sun.
3. As the earth changes its position, a different constellation or zodiac sign or raashi appears behind the sun.
4. This is what we express when we say that the sun enters a particular zodiac sign or raashi.
5. In rainy season due to the perceived motion of the sun, it enters mrug nakshatra and that is how it is expressed.

4. Answer the following questions. 

Question a.
What is a constellation?
Answer:
A group of stars occupying a small portion of the celestial sphere is called a constellation.

Question b.
What points should be considered before a skywatch?
Answer:

1. The place for sky watching should be away from the city and as far as possible it should be new moon night.
2. Binoculars or telescopes should be used for skywatch.
3. Identifying the pole star in the north makes the skywatch easier. Hence the pole star should be used as a reference point for skywatch.
4. As the stars in the west set early, sky watching should begin with stars in the west.
5. (a) On a sky map, the north and south are towards the bottom and top of the map respectively, (b) This is because the sky map is to be held overhead in such a way that the direction we face is at the bottom side.

Question c.
It is wrong to say that the planets, stars and nakshatras affect human life. Why?
Answer:

1. Science has proved that the constituents of the solar system e.g. planets, satellites and comets as also distant stars and constellations do not have any influence on human life.
2. Man has stepped on the moon and will conquer Mars in the 21st century.
3. Hence, in this age of science, holding on to beliefs which have been proved wrong by numerous scientific tests, is an unnecessary waste of time and energy.
4. It is important to consider all these issues with a scientific frame of mind.

5. Write a paragraph on the birth and life cycle of stars using following figure.

Question a.
Write a paragraph on the birth and life cycle of stars using following figure.
Answer:
Stars are born out of nebulae. Nebulae are clouds made up mainly of hydrogen gas and dust particles which are attracted towards one another by the force of gravity, (i) As a result of pressure, the internal temperature increases and the cloud becomes dense and spherical in shape, (ii) From the diagram, life cycle of two stars can be explained.

(a) Ordinary star: (i) The ordinary star forms a Red giant star at the later stage of its evolution when it runs out of hydrogen gas at its core. (ii) At the end stage of its life it forms a white dwarf. Stars like the sun become white dwarf when its nuclear fuel is totally exhausted. (iii) It is 1% in diameter of its original size.

(b) Massive Star: (i) Massive star forms Red super giant star at the end of its life cycle, (ii) They are also called super red giants with a relatively cool outer surface, (iii) Supernova is the explosive death of the star of the end of its life with the brightness of 100 million stars in a short amount of time, (iv) A neutron star is the dense core of the supernova. (v) It is the smallest and the densest star known to exist with a 10 km radius, (vi) Neutron stars sometimes end as a black hole, (vii) Black holes are not seen from telescopes and are identified by their intense gravitational pull where even light cannot escape.

Project:

Question a.
Visit a planetarium, collect information and present it in your school on Science day.

Class 7 Science Chapter 20 In the World of Stars Important Questions and Answers

Fill in the blanks:

Question 1.
The different group of stars is known as ………….. .
Answer:
constellation

Question 2.
The pole star is ………….. .
Answer:
North star

Question 3.
The moon moves around the earth in about ………….. days.
Answer:
27 days

Question 4.
The celestial objects are ………….. .
Answer:
The stars

Question 5.
The star that lies close to the aris of rotation of the earth ………….. .
Answer:
Pole star

Question 6.
The definite elliptical path in which a planet revolves around the sun is called ………….. .
Answer:
Orbit

Question 7.
Our earth as well as the sun belongs to the galaxy which has a spiral shape called ………….. .
Answer:
milky way

Question 8.
………….. is made up of five bright stars which are distributed along the figure of the letter M.
Answer:
Sharmishtha

Question 9.
The pole star has ……………. on one-side and ……………… on the other.
Answer:
Saptarashi, Sharmishtha

Question 10.
The continuous empty space between the planets and stars in the sky is called ………….. .
Answer:
space

Name the following:

Question 1.
The brightest star in the nakshatra.
Answer:
Yogatara

Question 2.
The stars forming a group that has a recognizable shape.
Answer:
Constellation

Question 3.
Millions of stars and planets present in the sky forming a group.
Answer:
Milky way

Question 4.
The clouds from which stars are bom.
Answer:
Nebulae

Question 5.
Saptarshi constellation in English.
Answer:
Great Bear

Question 6.
The festival celebrated when sun enters Makar raashi.
Answer:
Makara Sankranti

Question 7.
The brightest star in the Orion constellation.
Answer:
Sirius

State whether the following statements are True or False. Correct the false statements:

Question 1.
The hydrogen gas and dust particles in a nebulae are attracted towards each other by gravity.
Answer:
True

Question 2.
While standing on the ground, the celestial sphere exactly below our feet is called the Zenith.
Answer:
False. The point on the celestial sphere exactly above our head is called the Zenith

Question 3.
The circle describing the apparent motion of the earth around the sun is called the ecliptic.
Answer:
False. Ecliptic is the apparent motion of sun around the earth

Question 4.
Vrushchik or Scorpio is a constellation with 10 to 12 stars.
Answer:
True

Question 5.
Makar raashi is also known as Capricorn zodiac sign.
Answer:
True

Match the following:

Question a.

Column ‘A’	Column ‘B’
1. Saptarshi	a. Divided into 88 constellations
2. Mmg nakshatra.	b. In the north direction.
3. Orion	c. Group of 7 bright stars (kite)
4. Vrushchik	d. Made up of 5 bright stars (M)
5. Pole star	e. 7 – 8 stars.
6. Celestial sphere	f. Group of 10 -12 stars

Answer:

Column ‘A’	Column ‘B’
1. Saptarshi	c. Group of 7 bright stars (kite)
2. Mmg nakshatra.	d. Made up of 5 bright stars (M)
3. Orion	e. 7 – 8 stars.
4. Vrushchik	a. Divided into 88 constellations
5. Pole star	b. In the north direction.
6. Celestial sphere	f. Group of 10 -12 stars

Answer in one line:

Question 1.
In which direction stars move in the sky except polar star?
Answer:
When seen from earth, stars appear to move from east to west.

Question 2.
What activity does IUCAA carry out?
Answer:
IUCAA which is present in PUNE carries out fundamental research in astronomy.

Question 3.
Define constellation.
Answer: A group of stars occupying a small portion of the celestial sphere is called constellation.

Question 4.
What is Nakshatra?
Answer:
The moon completes one revolution around the earth in approximately 27 days. The portion celestial sphere traversed by the moon in one day is called a nakshatra.

Question 5.
What is yogatara?
Answer:
A nakshatra is known from the brightest star that it contains. The brightest star is called the yogatara.

Define the following:

Question 1.
Horizon
Answer:
Far away the sky seems to be touching the ground. The line at which they meet is caled horizon.

Question 2.
Zenith
Answer:
While standing on the ground the point on the celestial sphere exactly above our head is called the Zenith.

Question 3.
Nadir
Answer:
While standing on the ground the point on the celestial sphere exactly below our feet is called the nadir.

Question 4.
Meridian
Answer:
The great circle which passes through both the celestial poles and the observer’s zenith and nadir is called a meridian.

Question 5.
Celestial equator
Answer:
If we uniformly expand earth’s equator in all directions indefinitely, it will penetrate the celestial sphere along a circle. This circle is known as the celestial equator.

Question 6.
Ecliptic
Answer:
The earth moves around the sun, but seen from the earth, the sun appears to move along a circle on the celestial sphere. This circle describing the apparent motion of the sun around the ‘ earth is called the ecliptic.

Question 7.
Zodiac sign
Answer:
The ecliptic has been imagined to divided into 12 equal parts. Each part subtends 30 degrees at the centre of the celestial sphere. Each of these part is called a raashi or zodiac sign.

Question 8.
Mrug Nakshatra or Orion
Answer:
It has 7 – 8 starts of which four are at the comers of quadrangle. The line passing through the three middle stars of the constellation when extended meets a very bright star. This is Vyadh or Sirius.

Find out.

Answer the following questions

Question 1.
Using a Marathi calendar collect information about 27 nakshatras, and divide them into the following 3 categories.
(i) Monsoon Nakshatra (ii) Winter Nakshatra (iii) Summer Nakshatra
Answer:
27 nakshtras: Ashwini, Bharani, Krittika, Rohini, Mrigashirasha, Ardra, Punarvasu, Pushya, Ashlesha, Magha, PurvaPhalguni, Uttara Phalguni, Hasta, Chitra, Swati, Vishakha, Anuradha, Jyeshtha, Mula, Purva Ashadha, Uttara Ashadha, Abhijit, Shravana, Dhanishtha, Shatabhishta, Purva Bhadrapada, Uttara Bhadrapada, Revati

Monsoon Season	Winter Season	Summer Season
Ashwini Karthe	Krittika	Visakha
Bharani Karthe	Rohini	Anuradha
Arudra Karthe	Mrigashirsha	Jyeshtha
Pushyani	Ardra	Mula

Aslesha	Punarvasu	Purva Ashadha
Magha		Uttara Ashadha
Purva Phalguni		Shravana
Uttara Phalguni
Chitra
Hasta

Question 2.
Write the difference between constellations Saptarshi and Mrug nakshatra
Answer:

Saptarshi	Mrug nakshatra
1. It is made up of five bright stars which are distributed along the figure of the letter M.	1. It is made up of seven-eight stars of which four are at the corners of a quadrangle.
2. Pole star is the brightest star in the constellation.	2. Sirius is the brigh jveutr0n Starie constellation.
3. It is on the meridian in the month of April and in the month of October.	3. It is on the meridian in the month of February and in June.
4. In English, it is called the Great Bear.	4. In English, it is called Orion.

Question 3.
Draw sketches to show the relative position of prominent stars in Ursa major and Orion.
Answer:
a. Ursa major (Saptarshi) appears like a big dipper, (or kite shape). There are 3 bright stars in the handle and 4 stars in the bowl of the dipper. (It can be seen during April in summer in northern skies).

(b) Orion appears like a hunter. Three bright stars appear in the belt, 5 bright stars are arranged in the form of a quadrilateral. (It is visible during winter in the northern skies)

Question 4.
Why is the pole star important for sky watch?
Answer:

1. Identifying the Pole Star in the north makes the sky watch easier. Hence the pole star should be used as a reference point for skywatch.
2. If we extend one side of the quadrangle of Saptarshi, it reaches the Pole Star.
   The pole star has Saptarshi on one side and Sharmishtha on the other.

Question 5.
What is the relation between the pole star and the constellations Saptarshi and Sharmishtha?
Answer:

1. Saptarshi is in the shape of a quandrangle with a tail made up 3 stars resembling a kite. If we extend one side of the quadrangle it reaches the Pole Star.
2. The constellations of Saptarshi and Sharmishtha are useful in locating the Pole Star.
3. The perpendicular bisector of the line joining the third and fourth stars in Sharmishtha goes towards the Pole star.
4. The Pole Star has Saptarshi on one side and Sharmishtha on the other.

Use your brain power!

Answer the following questions.

Question 1.
One Zodiac Sign = ………….. nakshatras
Answer:
27 nakshatras. Each nakshatra is divided in padas or charan. Every nakshatra has 4 padas. These 27 nakshatra complete the entire circle of 360° of zodiac.
The zodiac comprises of 360°.

Question 2.
Is sun the only star present in our Milky Way galaxy?
Answer:
No. Sun is not the only star present in the Milky Way. There are lakhs of stars in the Milky Way, some of them being many times bigger than our sun. Some of them have their own planetary systems with a great diversity in colour, brightness, as well as size.