Ch2 : Latitudes and Longitudes

   CBSE Class 6 - Geography(Sst) - CH 1- Latitudes And Longitudes

                                 Exercises

 

 

1. Question : Answer the following question briefly :-

(a) What is the true shape of the Earth ?
Answer : The Earth look like an orange, bulging on the side and slightly flat at the top and bottom. The true shape of the Earth is a geoid.

 (b) What is a globe ?
Answer : A globe is a three-dimensional representation of the Earth.

(c) What is the latitudinal value of the the Tropic of Cancer?

Answer : It is 23 1/2 degree North.

(d) What are the three heat zones of the Earth ?
Answer : The three heat zones of the Earth are torrid zones, temperate zone and frigid zone.

(e) What are parallel of latitude and meridian of  longitude?

Answer: All parallel circle from the equator up to the poles are called parallels of latitude . Meridians of longitudes are the lines running from north pole to the south poles.

(f) Why does the torrid zone receive maximum amount of heat ?

Answer : The torrid zone  is the area that receive maximum heat of the Sun because the mid day Sun is exactly overhead at least once in a year on all latitude in between the Tropic of Cancer and the Tropic of Capricorn.

(g) Why is 5.30 p.m. in India and 12:00 noon in Londen ?

Answer : The time difference between India and London is 5 and a half hours. India is located east of the Greenwich at 82 degree 30 E. So, it will be 5:30 pm in India when it is 12 noon in London. 

The time difference between each degree of longitude is 4 minute and since India is in the east, the time here will be ahead of the Greenwich time.

2. Question : Tick the correct correct answer
(a) The value of the prime meridian is 
(i) 90 degree   (ii) 0 degree   (iii) 60 degree
 Answer : (ii) 0 degree

(b) The frigid zone lies near 
(i) the Poles    (ii) the Equator   (iii) the Tropic of Cancer

Answer : (i) the Poles

(c) The total number of Longitudes are :
(i) 360    (ii) 180    (iii) 90
Answer : (i) 360

(d) The Antarctic circle is located in

(a) the Northern Hemisphere
(b) the Southern Hemisphere
(c) the Eastern Hemisphere
Answer : (b) The southern Hemisphere

(e) Grid is a network of 
(i) parallel of latitudes and meridians of longitudes
(ii) the Tropic of Cancer and Tropic of Capricorn
Answer : (a) parallel of latitudes and meridians of longitudes

3. Question. Fill in the blanks 

(a) The Tropic of Capricorn is located at  23 and half degree south.
(b) The Standard Meridian of India is 82 degree 30 East
(c) The 0 degree Meridian i s also known as Prime Meridian.
(d) The distance between the longitude decreases towards Poles.
 (e) The Arctic Circle is located in the Northern hemisphere

Ch 1 : The Earth In The Solar System

CBSE Class 6 - Geography(Sst) - CH 1-The Earth In The Solar System

                                                   Exercise


1.  (a)  How does a planet differ from a star?
Answer.A planet differs from the star in the following ways : -
             

Star	Planet
Stars emit a large amount of heat and light  They are big heavenly bodies There are many stars which we cannot see with our naked eyes	They do not have heat and light of their own.They only reflect the light of the sun. Planets are called   ' Wanderers' because they revolve around the sun in fixed orbit. Planets can be seen with the help of the telescope.

(b)  What is the meant by the 'solar system'?
Answer. The sun, the planets, and satellites together with other minor bodies make up the solar system.The sun is at the center of the solar system. The planets revolve around the sun in their fixed orbits. The satellites revolve around the planets.


(c) Name all planets according to their distance from the sun.
Answer.   The  planets according to their didtance from the sun are: Mercury, Venus, Earth.Mars, Jupiter, Saturn, Uranus, Neptune, pluto.

(d)   Why is the earth called a unique planet?
Answer. The Earth is called a unique planet because of the following reasons : -
(i) Earth called a unique planet because Conditions favourable to support life are found only on the earth '.it is neither too hor noor too cold.
(ii) Earth has surface water which is very necessary for our survival.
(iii) It has life giving Oxygen and the Ozone layer which protects us from the harmful rays of the Sun.

(e) Why do we see only one side of the moon always ?
Answers : The moon revolves around the Earth in about 27 days. It takes exactly the same time to rotate on its axis. To complete both the moments, the Moon takes the same time. This is the reason why we see only one side of the Moon.

(f) What is Universe?
Answer. The universe is the whole body of stars. planets, satellites and gases . it is endless. Stars are huge bodies of glowing gases e.g. sun. Planets and satellites do not have heat and light of  their own. They are lit by the light of stars.

2.Question.Tick the correct answer.
(a) The planet known as the "Earth's Twin is.
1.Jupiter.            2.Saturn.               3. Venus.
Answer : 3. Venus
(b) Which is the third nearest planet to the sun.
1.Venus           2.Earth.          3.Mercurry.
Answer : 2. Earth
(c) All the planets move around the sun in a.
1.Circular path.       2.Rectangular path.  3.Elliptical path. 
 Answer : 3.Elliptical path.
(d) The pole star indicates the direction to the.
1. South      2.North.           3. East.
Answer : 2. North.
(e) Asteroids are found between the orbit of.
1.Saturn and Jupiter.      2.Mars and Jupiter.       3.The Earth and Mars.
 2.Mars and Jupiter

3. Question : Fill in the blanks.

1. A group of stars forming various pattern is called constellation.
2. A huge system of stars is called galaxy.
3. Moon is the closest celestial body to our earth.
4. Earth is the third nearest planet to the sun.
5. Planets do not have their own heat and light.

 

Ch 10 : The Banyan Tree

                  CBSE Class 6 - English - CH  10 - The Banyan Tree

 

                                 Exercise
1.Question.(i)  "It was to battle of champions"
(i) What qualities did the two champions have? Pick out words and phrases from paragraph above this line in the text and write them down:
 
Answer. Mongoose                          Cobra

1. A superb fighter.                 1. Skillful and experienced fighter.
2. clever.                                 2. move swiftly. 
3. aggressive.                          3. had poison filled sacs.

(ii) What did the cobra and the mongoose do, to show their readiness for the fight?
Answer. The cobra raised half of its body off the ground , and spread his broad,, spotted hood.
              The mongoose also made his tact fluffy. the long hair on his back also stood up.
             Thus both the fighters showed their readiness to fight.

  
2. Question. Who were the other two spectators? what did they do? (Did they join in the fight?)
Answer. The other two  spectators were a myna and a wild crow.   Yes they did join the fight with Cobra.

3.Question. Read the descriptions below of what the snake did and what the mongoose did. Arrange their actions in the proper order.
Snake                                                                Mongoose
1.ceased to struggle                                    grabbed the snake by the snout.
2.tried to mesmerism the mongoose         dragged the snake into the bushes.                    
3.coiled itself around the mongoose          darted away and bit the cobra on the back.    
4.struck the crow.                                        pretended to attack the cobra on one side
5. Struck again and missed                         refused to look into the snake's eye's                               
6.struck on the side that the                       sprang aside, jumped in the bit
   mongoose pretended  to attack.           .



Answer.

•          tried to measmerise the mongoose.
•         refuseed to look into the snake's eyes
•         mongoose Prentended to attack the cobra on side.    
•         struck on the side that the mongoose pretended  to attack.
•         darted away and bit the cObra on the back. 
•         Struck again and missed.
•         struck the crow.
•         grabbed the snake by the snout.
•         coiled itself around the mongoose
•         ceased to struggle
•         dragged the snake into the bushes.

4 .Question. (1) What happened to the crow in the end?
                      (2) What did the myna do in the end?
Answer. They watched from the cactus plant. At times they dived into attack the cobra. The crow once failed to fly back to its perch. It was bitten and killed by the cobra.The myna was saved. It flew down and, saw the dead snake in the bushes, congratulated the winner and finally flew away.

Ch 9 : Desert Animals

              CBSE Class 6 - English - CH  9 - Desert Animals


                               Exercise

1.Question. Talk to your partner and say whether the following statements are True or False.
(1) No animals can survive without water. (True)
(2) Desert are endless and sand dunes. (False)
(3) Most snakes are harmless. (True)
(4) Snakes cannot hear, but they can feel vibrations through the ground. (True)
(5) Camels store water in their humps. (False)

2.Question.
(i) How do desert animals survive without water?
Answer. The desert animals find different ways to get and store water.

(ii) How do mongooses kill snakes?
Answer. Mongooses like to hunt together. They are famous for killing snakes without getting hurt themselves. They can move very fast. They get aside each time the snake tries to bite them. They quickly attack and kill it.

(iii) How does the hump of the camels help them to survive when there is no water?
Answer. Some camels have only a single hump, others have two singal hump camel is used for riding. The hump, people wrongly believe, stores water. it is ful of fat. The fat serves has food for the animal.

Ch 8 : A Game Of Chance

             CBSE Class 6 - English - CH  8 - A Game Of Chance

                              Exercise

1.Why do you think Rasheed's uncle asked him  not to buy anything in his absence?
Answer. The uncle new how to the clever shopkeeper could cheat a littl innocent boy. So he warned Rasheed neither to buy  anything in his absence, nor go from that place.

2.Why was the shop called 'Lucky Shop'?
Answer.  The shop was called Lucky shop because it gave a chance to try one's luck.One had to select six discs and total  the numbers written on it. He paid 50 paise and won the thing marked with that total number.

3. An old man won a clock and sold it back to the shopkeeper. How much money did he make?
Anwser. The  old man added up the numbers or six discs. He got a beautiful clock marked 15 the shopkeeper bought back  the clock. The  old man made Rs.15 and went away very pleased.

4. How many prizes did the boy win? What were they?
Answer. The boy won for prizes in all. these were a comb, a fountain pen, a wrist watch and a table lamp.

5.Why was Rasheed upset?
Answer. Rasheed was upset because he bad lost all his money and got nothing.He called it his bad nothing.
He called it is  bad luck.His uncle explained to him that he had been be fooled and cheated by the shopkeeper.

6.In what way did the shopkeeper make a fool of Rasheed?
Answer. The shopkeeper played tricks to tempt Rasheed to try his luck. Every time Radheed played the game, he got only some cheap thing which was bought back by the  shopkeeper. In this way Rasheed lost all his money.

Ch 7 : Fair Play

                     CBSE Class 6 - English - CH  7 - Fair Play

                                             Exercise

1.Question. When the situation changed’ what is being referred to?
Answer. Jumman promised to support his old aunt as long as she lived. So she transferred her property to him. But after a couple of years he and his wife forgot the promise and began to harass. Thus the situation changed.

2.Question. When Jumman’s aunt realized that she was not welcome in his house, what arrangement did she suggest?
Answer. The old lady realized that she was an unwanted burden on Jumman. So she suggested a way out. She demanded a monthly allowance so that she might allowance so that she might set up a separate kitchen.

3.Question. What was the villager‘s reaction when the aunt explained her case to them?
Answer. The old aunt went the every house in the village to seek support. But the most of the villagers either laughed at her or advised her to make peace with Jumman. Very few sympathized with her.

4.Question. Why was Jumman happy over Algu’s nomination as head Panch?
Answer. Jumman felt inwardly happy when the old aunt named Algu as head Panch. The reason for his happiness was that he was sure to get decision in his favour from his best friend Algu.

5.Question. “God lives in the heart of the Panch”, the aunt said. What did she mean?
Answer. She meant that a panch has nor friend enemy. He upholds firmly what is fair, just and true. This is godly virtue. The Panch thus becomes the mouthpiece of God.

6.Question. What was Algu‘s verdict as head panch? How did Jumman take it?
Answer. As head panch Algu set aside his personal feelings for his friend. He heard Jumman case and cross-examined him. Finally h announced that Jumman must either grant his aunt monthly allowance or return her property to him.

7.Question. Algtu found himself in a tight spot. What was his Problem?
Answer. Algu go into trouble. He had sold one bullock Samjhu Shau who starved the animal to death. When Algu demanded the price of the bullock after a few months, Sahu got angry. He refused to pay even a penny for the worthless animal. Algu had to approach the Panchayat for Justice.

8.Question. Why was Algu upset over Jumman‘s nomination head Panch?
Answer. Algu’s knew that Jumman had become his enemy after the verdict he had given in favour of the old aunt. He had a fear that Jumman would naturally try to take revenge as head Panch. So his heart sank and he lost all hope.

9.Question. What was Jumman’s verdict as head Panch? How did Algu take it?
Answer. On occupying the post of a Panch, Jumman became sensible and justice loving. He gave the verdict in favour of Algu. He ordered Sahu to pay the price of bullock that he owed to Algu.

Ch 6 : Who I Am ?

   CBSE Class 6 - Science - CH  6 - Who I Am ?

                              Exercise

A.Question.  Answer of the following question.
1.    Peter’s favourite day of the week is  Sunday because on that day the whole family goes to see a film, eat
ice-cream and peanuts.
2.    Nasir wants to learn how to preserve cotton seeds as not to buy new seeds every year.
3.   Dolma believes that he can make a good Prime Minister because  he is intelligent and thoughtful. He has big plans for a happy and progressive India.

B.    Write T or F  against each of the statements:
1.    Peter is an only child. F
2.    When Serbjit gets angry he shouts at people. F
3.    Nasir lives in the city. F
4.    Radha’s mother enjoys doing things with her.T

Ch 5 : A Different Kind of School

           CBSE Class 6 - English - CH 16 - A Different Kind of School

                               Exercise

1.Question. Why do you think the writer visit Miss Beam’s school?
Answer. The writer visited Miss Beam’s school to see what her original method of teaching was. He had heard a lot about the school.

2.Question. What was the ‘game’ was the every child in the school had to play?
Answer. Every child in the school had to play the game of being blind, lame deaf, or dumb at least once during the session. He had his eyes bandaged or his one leg tied up. This made of blind or lame for a day.  He was helped and guided by another boy. This game made the child understand and also share misfortune.

3.Question. Each term every child has one blind day, one lame   day……’complete the line. Which day was the hardest? Why was it hardest?
Answer. The blind Day’ was really the hardest or most difficult. The bandaged  girl also admitted that it was awful to be blind. One couldn’t see anything. One felt he/she was going to hit by something every moment. It was great relief just to sit down.

4.Question. What was the purpose of these special days?
Answer. There was a purpose behind these special days at  Beam’s school.
 

Ch 4 : An Indian American Woman in space. Kaplana Chawla :

CBSE Class 6 - English - CH  4 -  An Indian American Woman in space. Kaplana Chawla

                              Exercise   

1.    Question.  Where was Kalpana Chawla born?  Why is she called an Indian- American?
Answer.  Kalpana Chawla was born in  Karna l, Haryana. By her birth in India, she was an Indian citizen. But she obtained American citizenship. So she is called an Indian American.

2.    Question. When and why did she go to U.S.? Who did she marry?
Answer. She went to the us for a master’s degree. Later she earned her doctorate in aerospace engineering. She married an American flight instructor jean Pierre Harrison.

3.    Question. How did she become an astronaut? What gave her the idea that she could be an astronaut?
Answer. In 1994, she was selected by NASA for training as an astronaut. Her first space mission was in the space shuttle Columbia. After qualifying as a pilot, the idea to become an astronaut came to her mind.

4.    Question. What abilities must an astronaut have, according to the journalist?
Answer. An aspiring astronaut needs a wide range of information. He should know a lot about everything, from Biology to aeronautical engineering.

5.    Question. What does Kalpana  Chawala say about pursuing is  dream? Do you agree with her that success is possible?
Answer.  Kalpana  Chalwa sent a message from aboard  Columbia to the students of her college in Chandigarh. She assured them that they could very well realize their dream success. The path was there. She wished them to find that path and walk on it with courage. She wished them a great journey.

Ch 3 : Taro’s Reward ?

CBSE Class 6 - English - CH  3 - Taro's Reward ?

Exercise

1.Question. Why did Taro run in the direction of the stream?
Answer. Taro ran in the direction of the sound of flowing water. because he was thirsty. Secondly, he had never before seen any spring in that part of the forest.

2.Question. How did Taro’s father show his happiness after drinking sake?
Answer. Taro’s father drank the Sake and was delighted. He stopped shivering. He also danced a little with joy.

3.Question. Why did the waterfall give Taro Sake and others water?
Answer. The waterfall favoured Taro because he was sincere, kind, hard working and obedient to his parents. Other people were just greedy. They reached there to collect Sake for their own pleasure.

4.Question. Why did the villagers want to drown Taro?
Answer. The villagers tasted the liquid and found it just plain cold water. They shouted angrily that Taro had befooled them. So they wanted to punish Taro and drown him in the waterfall.

5.Question. Why did the Emperor reward Taro?
Answer. The Emperor rewarded Taro in order to encourage other children also to obey, love and serve their parents.

Ch 2 : How the Dog Found Himself A Master ?

CBSE Class 6 - English - CH  2 - How The Dog Found Himself A Master ?

                                               Exercises

1.Question : Why did the dog feel the needed for a master? Answer : The dog felt sick and tired of wandering alone in search of food. Secondly, he was afraid of other animals stronger than him. So he felt the need to have a master.

2. Question : Who did he first choose as his master? Why did he leave that master?
Answer : The dog first chose a big wolf as his master. The wolf agreed to take him in his service. But the sight of a bear made him run off out of fear. Seeing that the bear was stronger than the wolf, the dog left him and changed his master.

3. Question : Who did he choose next?
Answer : The dog first took up service with the wolf. But he found the wolf afraid of the bear, The stronger of the two. So he chose bear as his new master.

4. Question : Why did he serve the lion for a long time?
Answer : The bear was strong but weaker than the lion. The lion ruled the forest. He was said to be the strongest beast on the earth. So the dog left the bear and joined the lion. He now felt safe and happy in the forest. So he served lion for a long time.

5. Question : Who did he finally choose as his master and why?
Answer : The dog one day found the lion also afraid of man. The lion decided to keep away from man. So the dog finally realised that man was the strongest creature on the earth. So he joined man. He still continues to be man’s most loyal servant.

Ch 1 : Who Did Patrick's Homework ?

 CBSE Class 6 - Science - CH  1  - Who Did Patrick's Homework ?

 

Exercise

 

1. What did Patrick think his cat was playing with?what was it really ?
Answer. Patrick thought that his cat with a doll was playing with a doll. But he was mistaken. The doll was really a Little man or elf.

2. Why did the little man grant Patrick a wish?
Answer. The little man was in serious trouble or danger. He appealed to Patrick to save his life from the cat. In return he promised to fulfill one wish of Patrick.

3. What was Patrick’s wish?
Answer. Patrick wished that the little man or elf should do all his homework till the end of the session.

4.In what subject. Did the little man need help, to do Patrick ‘s homework ?
Answer. The little man needed Patrick’s help in English, Math, and History.

5.How did Patrick’s help him?
Answer. Patrick had to consult a dictionary, guide the elf in doing sums in arithmetic and read out portions from history book.

6.Who do you think did Patrick’s homework . the little man, or Patrick himself? Give reasons for your Answer.
Answer. Truly speaking, it was not the elf but. Patrick himself who had done all the homework.

English Textbook Solutions Class 6

As there are Two books of English in class 6

1) Honeysuckle
2) A Pact With The Sun

First the Honeysuckle solutions have been solved and after that
A Pact With The sun.


Each Chapter covered with step by step method.
Easy Learning

Science Textbook Solutions Class 6

Each Chapter covered with step by step method.
Easy Learning.

Ch 16 : Garbage In Garbage Out

CBSE Class 6 - Science - CH 16 - Garbage In Garbage Out

 

Q1: Fill in the blanksAnswer:
1. Converting plant and animal waste including that from kitchen, into manure, is called composting.
2. A garbage dump is also used as landfill.
3. The method of making compost from kitchen garbage using redworms is called vermicomposting.
4. Consuming food packed in such plastic bags could be harmful to our health.



Q2: (a) Which kind of garbage is not converted into compost by the redworms?
(b) Have you seen any other organism besides redworms, in your pit? If yes, try to find out their names. Draw pictures of these.

redworms - friends of farmers

Answer: Non bio-degradable waste like pieces of cloth, polythene bags, broken glass, aluminium wrappers, nails, old shoes and broken toys cannot be converted into compost by the redworms.

(b) Besides redworms there are spiders, small bugs, flies, moulds and small insects etc. can be seen in the pit. Compost is also rich of microbes which can't be seen with unaided eye.



Q3: Discuss:
(a) Is garbage disposal the responsibility only of the government?
(b) Is it possible to reduce the problems relating to disposal of garbage?

Answer:
(a) Garbage Disposal is the responsibility of every citizen. If we continue to generate so much garbage, very soon our beautiful earth will convert into a big garbage-bin. Non-biodegradable waste like plastic is harmful to our environment as well as to our health. We must ensure ways to reduce production of garbage. Wherever possible, we must use recyclable material in our daily use.

(b) Yes it is possible to reduce the problems relating to disposal of garbage to a large extent. We should use those materials which are recyclable. We should avoid or reduce the use of non-biodegradable materials at minimum level. While throwing out garbage in trash can, we should separate biodegradable waste from non-biodegradable and throw them in separate bins.

Q4: (a) What do you do with the left over food at home?
(b) If you and your friends are given the choice of eating in a plastic plate or a banana leaf platter at a party, which one would you prefer and why?

Answer: (a) Left over food can be collected and be converted into compost. We can feed our pet animals with left over food. If enough food is left  (e.g. after a party), we may distribute the food to shelter homes.

(b) Banana leaf is a better choice. It is bio-degradable and can be disposed easily. On the other hand, eating in plastic plate is not good. Plastic material may contain harmful substance which can make the contained food toxic. which is harmful to our health. Also plastic is non-biodegradable, it will not dispose off easily.

Q5: (a) Collect pieces of different kinds of paper. Find out which of these can be recycled.
(b) With the help of a lens look at the pieces of paper you collected for the above question. Do you see any difference in the material of recycled paper and a new sheet of paper ?  

Answer:
(a) Almost all kinds of paper are recyclable i.e. newspapers, magazines, papers, notebooks, envelopes etc.

(b) The difference between new sheet and recycle paper is subtle. Usually hand made recycled paper is of coarse quality.

Q6:  (a) Collect different kinds of packaging material. What was the purpose for which each one was used? Discuss in groups.
(b) Give an example in which packaging could have been reduced?
(c) Write a story on how packaging increases the amount of garbage.

Answer:
(a) Different kinds of packaging materials used commonly are:

1. Cardboard - used as shoe boxes
2. Plastic Bags - Toys covers, sarees bags
3. Wooden Boxes - Fruit baskets
4. Jute Bags - School bags, shopping bags

(b) Since plastic is harmful to our environment and is non-biodegradable. We should avoid using plastic packaging.

(c)  The basic purpose of packaging is to protect the product from tampering and to maintain its freshness. However, most of the packaging material is used to beautify the boxes and make them look attractive on the shelves. Unfortunately a large volume of packaging material goes waste and is thrown into dustbin. For example, if you go to any park, there dustbins are full of potato chips wrappers. It unnecessarily increases the amount of garbage. It also increase the cost of the product due to unnecessary packaging. We should seriously consider how to reduce unnecessary packaging. We should prefer buy products carry less packaging material.

Q7: Do you think it is better to use compost instead of chemical fertilisers? Why?

Answer:  No doubt compost is better to use than chemical fertilizers due to following reasons:

1. Compost is much easier to prepare.
2. Compost is environment friendly whereas fertilizers can harm our health and the environment.
3. Compost does not pollute our environemnt.
4. Compost decomposes bio-degradable waste into natural soil. It conserves our environment.

Q8: How do redworms prepare vermicompost?

Answer: Red worms have a special structure called gizzards in their bodies with which they grind food material and covert it into manure.

Q9: What will happen if garbage is not disposed off?

Answer: If garbage is not properly disposed off, these garbage dumps turn into breeding grounds for micro-organisms, flies, cockroaches and mosquitoes, that may cause diseases.

Q10: Why is it illegal to burn leaves and other plant wastes?

Answer: Burning of leaves and other plant wastes produces smoke and gases that are harmful to
our health. They may lead to asthma and lung diseases. Instead of burning, these plant wastes must be converted into manure.

Q11: Why should we not throw plastic bags or wrappers carelessly on roads and other places?

Answer: The plastic bags thrown away carelessly on roads and other places get into drains and the sewer system. As a result, drains get choked and the water spills on the roads. During heavy rains,
it might even create a flood like situation.
Sometimes, these bags are eaten by stray animals like cows, dogs etc. These bags are toxic in nature and affect their health.

Ch 15 : Air Around Us

CBSE class 6 - Science - CH 15 - Air Around Us

Q1: What is the composition of air?
Answer: Air is a mixture gases, water vapours and dust particles. Largely it consists of:

1. Nitrogen (79%)
2. Oxygen (20%)
3. Carbon Di-Oxide (1%)
4. Other gases like Helium, Hydrogen etc.
5. Water Vapours
6. Dust particles

Q2: What are the important properties of air?

Answer: Important properties of air are:

1. Air occupies space.
2. Air is present every where including water and soil.
3. Air is transparent.
4. Air is colourless.
5. Air is essential for life on earth.

Q3: Which gas in the atmosphere is essential for respiration?
Answer:  Oxygen is essential for living organisms.


Q4: How will you prove that air supports burning?

Answer: Place a burning candle in a tray. Cover it with a glass jar. To make it air-tight, fill tray with water. After sometime, burning candle dims and goes off. Water level also rises up in the jar. It shows air support burning.

Explanation: During burning, oxygen is consumed and carbon-dioxide is released. After sometime no oxygen is left inside the jar and flame goes out. Once the candle goes off, the temperature surrounding the candle cools down and volume of air (carbon dioxide) decreases. Thus water rises up little in the jar.

Q5: How will you show that air is dissolved in water?

Answer: Take some water in a glass vessel or beaker. Heat it slowly on a tripod stand. Well before the water begins to boil, look carefully at the inner surface of the vessel. These bubbles come from the air
dissolved in water.


Q6: Why does a lump of cotton wool shrink in water?

Answer: Air is present in the cotton wool. When dipped in water, air present in wool escape and it shrinks.

Q7: Fill in the blanks:

Answer: 
1.  The layer of air around the earth is known as _atmosphere_.

2. The component of air used by green plants to make their food, is _carbon dioxide__.

3. Air occupies _space_.

4. Aquatic animals use _dissolved_ air in water for respiration.

Q8: List five activities that are possible due to the presence of air.

Answer:

1. Animals use air for respiration.
2. Plants use air to prepare their food. (photosynthesis)
3. Power generation by wind mills.
4. Burning of fuels and substances.
5. Air helps in the scattering of seeds and pollens of plants. (pollination).
6. Air helps in the movements of sailing yachts, gliders, parachutes and aeroplanes.

Q9: How do plants and animals help each other in the exchange of gases in the atmosphere?

Answer:  There is the interdependence of plants and animals. Both plants and animals respire i.e. they inhale oxygen and gives out carbon dioxide in the atmosphere. Plants take carbon dioxide from the atmosphere and prepare food. This is called photosynthesis. During this process, plants give out oxygen to the atmosphere. Therefore plants and animals help each other in the exchange of gases in the atmosphere.

Q10:Why do why earthworms come out of the soil, only during heavy rains?

Answer: Most of the small organisms like earth worms, rodents live inside the soil. They usually live in burrows and holes in the soil. These burrows also make spaces available for air to move in and out of the soil. However, when it rains heavily, water fills up all the spaces occupied by the air in the soil. In this situation, animals living in the soil have to come out for respiration.

Q11: What is the use of Nitrogen?

Answer: Nitrogen is used in protein synthesis. Nitrogen is an important constituent of amino-acids which manufacture proteins, Proteins are required by living organisms to grown and repair their body parts.

Q12: How Oxygen is removed from the atmosphere?

Answer:

1. Through combustion or burning of substances,
2. Through respiration by living beings.
3. Rusting of iron.

Ch 14 : Water

CBSE Class 6 - Science - CH14 - Water

Q1: Fill up the blanks in the following:(a) The process of changing of water into its vapour is called _________________.
(b) The process of changing water vapour into water is called _________________.
(c) No rainfall for a year or more may lead to _________________ in that region.
(d) Excessive rains may cause _________________.
(e) Water disappears from wet clothes by the process of ___________________.
(f) In winter mornings , __________is formed due to condensation of water vapour near the ground.
(g) The major natural source of water is _________________.
(h) Many tiny water droplets high up in the air, come together and fall down as _____________, __________ and ___________.

Answer:


(a) evaporation
(b) condensation
(c) drought
(d) flood
(e) evaporation
(f) fog
(g) oceans and sea
(h) rain, hail, snow


Q2: State for each of the following whether it is due to evaporation or condensation:

(a) Water drops appear on the outer surface of a glass containing cold water.(b) Steam rising from wet clothes while they are ironed.
(c) Fog appearing on a cold winter morning.
(d) Blackboard dries up after wiping it.
(e) Steam rising from a hot girdle when water is sprinkled on it.

Answer:
(a) Water drops appear on the outer surface of a glass containing cold water. - condensation
(b) Steam rising from wet clothes while they are ironed. - evaporation
(c) Fog appearing on a cold winter morning. - condensation
(d) Blackboard dries up after wiping it. - evaporation
(e) Steam rising from a hot girdle when water is sprinkled on it. - evaporation



Q3: Which of the following statements are “true” ?

Answer:
(a) Water vapour is present in air only during the monsoon. (False ✗)
(b) Water evaporates into air from oceans, rivers and lakes but not from the soil.(False ✗)
(c) The process of water changing into its vapour, is called evaporation.(True ✓)
(d) The evaporation of water takes place only in sunlight.(False ✗)
(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.(True ✓)
(f) Life is possible on earth without water (False ✗)
(g) When water is heated, it changes into ice. (False ✗)
(h) Evaporation of water takes place at all times. (True ✓)
(i) Saline water is fit for drinking and other domestic, agricultural and industrial needs. (False ✗)
(j) About two-thirds of the earth is covered with water. (True ✓)




Q4: Suppose you want to dry your school uniform quickly. Would spreading it near an anghiti or heater help? If yes, how?

Answer: Yes, spreading school uniform near anghiti or heater would help dry it quickly. Heater will warm up the surroundings and increase the rate of evaporation. Therefore school uniform will dry up quickly.


Q5: Take out a cooled bottle of water from refrigerator and keep it on a table. After some time you notice a puddle of water around it. Why?

Answer: It is due to condensation of water vapours present in air.  The cold surface of the bottle cools the air around it, and the water vapour of the air condenses on its surface.


Q6: To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet.

Answer: When we breathe out, moist air comes out which make the glasses wet. Also when we breathe out, we release carbon-dioxide gas which cools the surroundings by absorbing heat from air, thus condenses the water vapours.


Q7: How are clouds formed?

Answer: Clouds are formed due to the process of evaporation and condensation. When air moves up, it gets cooler and cooler. At sufficient height, the air becomes so cool that water vapours present in the air condense. They form tiny droplets and float in air as clouds.

Drought
credits:wikipedia

Q8: When does a drought occur?

Answer:  When there is insufficient or no rainfall occurs for more than a year in a region, the scarcity of water happens. Ponds and wells dry up. The soil continues to lose water due to evaporation and transpiration and eventually dry. This leads to drought.


Q9: What is rainwater harvesting? What are the two rainwater harvesting techniques?

Answer: Collecting rain water and storing it for later use is called rainwater harvesting. The two techniques of rainwater harvesting are:

1. Rooftop rainwater harvesting.
2. Allowing water to into ground directly through roadside drains.

Q10: Explain Water cycle with diagram.

Answer: The continuous journey of water in nature from earth to clouds and back to the earth is called water cycle.  The water cycle mainly consists of following processes:

• Evaporation and Transpiration
• Condensation
• Precipitation
• Accumulation

1. When the sun heats up the water in rivers, ponds, oceans and lakes, it turns water into vapours.  Plants also lose water into air due to transpiration.
2. At sufficient heights, the water vapours in the air cool down and condense to form clouds
3. Precipitation occurs when too much water vapours condense. The clouds become heavy and begin to fall as rain, hail or snow.
4. The water falls on the earth, it goes into lakes, oceans, rivers and ground.

Q11: Explain how floods causes extensive damage to human life and property?

Answer:

1. Droughts results in drying up of the crops and vegetation.
2. Its leads to scarcity of food and fodder for humans and animal life.
3. It leads to malnutrition in humans and animals.

Q12(MCQ): What do we see on the surface of the glass containing ice-chilled water ?

(a) dust
(b) water vapour
(c) water droplets
(d) ice

Answer: (c) water droplets

Q13(MCQ): Evaporation of water in shade is

(a) fast
(b) faster
(c) slow
(d) none of these

Answer:  (b) faster

Q14(MCQ): The process of changing water into water vapours is called

(a) filtration
(b) condensation
(c) evaporation
(d) sedimentation

Answer: (c) evaporation

Q15(MCQ): How much water is consumed by a city-dweller in washing, bathing, flushing the toilet etc.?

(a) 2-3 litres
(b) 10-15 litres
(c) 100-300 litres
(d) 1000-1500 litres

Answer:  (c) 100-300 litres

Q16(MCQ): If tap of your bathroom is leaking drop by drop, how much water is lost per day?

(a) 1 bucket full of water
(b) 2 buckets full of water
(c) 8 buckets full of water
(d) 20 buckets full of water

Answer:  (c) 8 buckets full of water

Ch 13 : Fun With Magnets

Class 6 - Science - CH 13 - Fun with Magnets

Q1: Fill in the blanks in the following:

Answer:

(i) Artificial magnets are made in different shapes such as _bar-magnet_, _cylindrical_ and _horse-shoe magnet_.

(ii) The Materials which are attracted towards a magnet are called_magnetic materials_.

(iii) Paper is not a _magnetic_ material.

(Explanation: Paper does not attract to magnet. Therefore it is a non-magnetic material).

(iv) In olden days, sailors used to find direction by suspending a piece of _bar magnet_.

(v) A magnet always has _two__ poles (i.e. North Pole and South Pole).

Q2: State whether the following statements are true or false.

Answer:

(i) A cylindrical magnet has only one pole. - False (✗)

(ii) Artificial magnets were discovered in Greece. - False - (✗)

(iii) Similar poles of a magnet repel each other. - True - (✓)

(iv) Maximum iron filings stick in the middle of a bar magnet when it is brought near them.- False - (✗)

(v) Bar magnets always point towards North-South direction. - True - (✓)

(vi) A compass can be used to find East-West direction at any place. - True - (✓)

(vii) Rubber is a magnetic material. False - (✗)

Q3: It was observed that a pencil sharpener gets attracted by both the poles of a magnet although its body is made of plastic. Name a material that might have been used to make some part of it.

Answer: The blade of the pencil sharpener is made of iron. Iron is a magnetic in nature. That's why the sharpener gets attracted by the poles of a magnet.

Q4: Column I shows different positions in which one pole of a magnet is placed near that of the other. Column II indicates the resulting action between them for each situation. Fill in the blanks.

Answer: 

Column I	Column II
N-N	Repulsion
N-_S_	Attraction
S-N	Attraction
_N_-S	Repulsion

Q5: Write any two properties of a magnet.

Answer:

1. Each magnet has two poles i.e. North Pole(N) and South Pole(P)
2. Opposite poles of two magnet attract each other while like poles of two magnet repel each other.
3. A freely suspended magnet always aligns in N-S direction.



Bar Magnet

Q6: Where are poles of a bar magnet located?

Answer: The two ends of the bar magnet represents the two poles.

Magnetic Compass

Q7: A bar magnet has no markings to indicate its poles. How would you find out near which end is its north pole located?

Answer: Hang up the magnet by a cotton thread so that it hangs freely. When it comes to rest, we notice that the magnet is lying in a North - South direction.

Magnetic compass works on the same principle. In past it was used by sailors or travellers to find directions.

Q8: You are given an iron strip. How will you make it into a magnet?

Answer:

1. Take a rectangular piece of iron. Place
   it on the table.
2. Take a bar magnet and place one of its poles near one edge of the bar of iron.
3. Without lifting the bar magnet, move it along the length of the iron bar till you reach the other end.
4. Lift the magnet and bring the pole (the same pole you started with) to the same point of the iron bar from which you began 
5. Move the magnet again along the iron bar in the same direction as you did before. Repeat this
   process about 30-40 times.
6. Bring few allpins near to the iron bar and check if it is converted to a magnet or not.

Compass Directions

Q9: How is a compass used to find directions?

Answer: A magnetic compass consists of a small pointed magnet which is suspended freely. A freely suspended magnet always aligns in N-S direction. The red coloured magnetic needle points to North direction. Once we know North direction, we can easily find out the other directions.

E.g. If North is upwards, South is downward side, East will be on right hand side and West shall be on left hand side.

Q10: A magnet was brought from different directions towards a toy boat that has been floating in water in a tub. Affect observed in each case is stated in  Column I. Possible reasons for the observed affects are mentioned in Column II. Match the statements given in Column I with those in Column II.

Answer:

Column I	Column II
Boat gets attracted towards the magnet	Boat is made of magnetic material
Boat is not affected by the magnet	Boat is made up non-magnetic material
Boat moves towards the magnet if north pole of the magnet is brought near its head	Boat is fitted with a magnet with south pole towards its head
Boat moves away from the magnet when north pole is brought near its head	Boat is fitted with a magnet with north pole towards its head
Boat floats without changing its direction.	Boat has a small magnet fixed along its length

Q11: What is magnetite?

Answer: The natural magnet is called magnetite.

Q12: Name the place it is believed where natural magnet was found first time.

Answer: Magnesia in Ancient Greece.

Q13: How magnets were discovered?

Answer: There was a shepherd called Magnes who lived in Ancient Greece. He used to carry a stick with iron piece attached to it while taking his sheep for grazing to nearby mountains. One day he found his stick was attracted to a rock. This was the way he discovered natural magnet.

Q14: What are magnetic materials? Give two examples.

Answer: The materials which get attracted to magnets are known as
magnetic materials.

Examples are: Iron, Nickel, Cobalt

Q15: What are non-magnetic materials? Give examples.

Answer: The materials which do not get attracted to magnets are called non-magnetic materials.

Examples: Plastic, wood, paper

Q16: How do magnets loose their magnetic property?

Answer: Magnets lose their property on heating, hammering and dropping.

Q17: If a bar magnet is cut lengthwise into three parts, how many number of Poles will form?

Answer: Six (Three North and three south)

 

Ch 12 : Electricity and Circuits

CBSE Class 6 - Science - CH 12 - Electricity and Circuits

Q1. Fill in the blanks :(a) A device that is used to break an electric circuit is called _______________.
(b) An electric cell has _______________ terminals.
(c) Electric cell is a device which converts energy of chemicals into ________________energy.
(d) The electric energy which is supplied in our home comes from electric  _______________houses.
(e) An electric ______________ is a continuous path along which the current flows.
(f) If the filament of a bulb breaks, it is said to be ______________.
(g) Rubber is a good example of electric ______________.
Answer:
(a) switch
(b) two terminals
(c) electrical
(d) poles nearby
(e) circuit
(f) fused
(g) insulator

Q2: Mark 'True' or 'False' for following statements:


Answer:
(a) Electric current can flow through metals. (✓ True)
(b) Instead of metal wires, a jute string can be used to make a circuit. (✗ False)
(c) Electric current can pass through a sheet of thermocol. (✗ False)
(d) When current flows through a circuit, the circuit is called open circuit. (✗ False)
(e) An electric bulb has one terminal (✗ False)

Q3: What is an electric cell?

Answer: An electric cell is a device which converts chemical
energy into electric energy. It has two different metal plates:

• one is the positive terminal
• the other is the negative terminal

These plates are kept inside a chemical called electrolyte, which stores the chemical energy.

Q4: Explain why the bulb would not glow in the arrangement shown in Fig. below:

Answer: The handle of the screw driver acts as an insulator. It does not allow current to flow and circuit is still open. Therefore the bulb does not glow in the arrangement.

Q5: Complete the drawing shown in Fig  below to indicate where the free ends of the two wires
should be joined to make the bulb glow. 

Answer: The bulb will glow when circuit is complete i.e. one end of the wire from clip is connected to positive terminal. Second end of the wire from the clip is connected to the bulb.

Q6: Would the bulb glow after completing the circuit shown in Fig. above (Q5) if instead of safety pin we use an eraser?

Answer: No. An eraser is made of rubber which is a poor conductor of electricity. Therefore, bulb would not glow.

Q7: What is the purpose of using an electric switch? Name some electrical gadgets that have switches built into them. 

Answer: An electric switch is a simple device which is used to break or complete an electric circuit. Switches are widely used in different electrical or electronic gadgets. A few are:

• Toggle switches used in houses.
• Pushbutton switches used in microwaves, water pump, mixer etc.
• Joystick switches used in Video Games Controllers, Toy Cars etc.

Q8: Do all materials allow electricity to pass through them?

Answer: No.

Q9: Would the bulb glow in the circuit shown in Fig. below?

Answer: The electric bulb has two terminals, both the wires are connected to the one terminal of the bulb. Current will not flow from the bulb and it will not glow. To make glow, the two wires should be connected to each terminal of the bulb, as shown below.

Q10: What are the components of an electric circuit?

Answer: In general a circuit has the following components:

1. A cell or battery : source of electricity.
2. Connecting wires
3. Bulb or electric device
4. Key or switch.

Q11: How many terminals are there in an electric cell?

Answer:An electric cell has two terminals; positive and negative. The metal cap is the positive terminal of the cell. The metal disc is the negative terminal.

Q12: Using the "conduction tester" on an object it was found that the bulb begins to
glow. Is that object a conductor or an insulator? Explain.

Answer:Since the object allows current to flow and completes the circuit. Due to this bulb begins to glow. It means the object is a conductor of electricity.


Q13: What are conductors? Give examples.

Answer:  The materials which allow electric current to pass through them are called conductors.
Examples are: All metals (copper, silver, iron) are good conductors. Water usually contains impurities and traces of salt is also a good conductor. Human body is also a conductor.


Q14: What are insulators? Give examples.

Answer: Materials that do not allow electricity to pass through them are called insulators. Insulators oppose electric current and so they are used as protection from the dangerous effects of electricity.
Examples of  insulators are glass, air, plastic, cotton, thermocol, wood and rubber.



Q15: Why should an electrician use rubber gloves while repairing an electric switch at your home? Explain


Answer: Electricians need to touch copper wires or they may accidentally come in contact with live wires (wires carrying current). Since human body is also a good conductor, electricians may get shock. Rubber is good insulator. To prevent themselves from electric shock or flow of current, the electricians use rubber gloves while repairing.

Q16: The handles of the tools like screwdrivers and pliers used by electricians for repair work usually have plastic or rubber covers on them. Can you explain why?

Answer: Without the help of insulators, the use of electrical tools like pliers and screwdrivers is impossible. Wood and plastics are insulators and help in avoiding direct contact with electric current.  When electricians touch these live electric wires with the tools covered with plastic and wood, current does not flow in their body avoid any accident.

Q17(MCQ): In an electric bell, the electric energy is transformed into ____________energy.
(a)Mechanical energy
(b) Magnetic energy
(c) Sound energy
(d) Light energy

Answer:  (b) Magnetic energy

Q18(MCQ): The tiny coiled metal wire present inside the bulb is called____________.
(a) Element
(b) Conductor
(c) Filament
(d) None of these

Answer: (c) Filament


Q19(MCQ): Which of the following is NOT a good conductor of electricity?


(a) Mercury
(b) Copper
(c) Plastic
(d) Aluminum foil


Answer: (c) Plastic


Q20(MCQ): Which of the following is a good conductor of electricity?

(a) Wood
(b) Paper
(c) Glass
(d) Graphite

Answer:  (d) Graphite


Q21: What will happen if you join the two terminals of a cell without connecting them through a switch or a bulb?

Answer: By doing so, the chemicals in the electric cell get used up very fast and the cell will no longer produce electric current. It will stop working.

Q22: Why do an electric bulb and an electric cell have two terminals?

Answer: Because the two terminals (positive and negative) can be connected to form an electric circuit.

Q23: Is Distilled water a conductor of electricity?

Answer: No. The distilled water is the purest water and it acts as an insulator. Therefore, it used in batteries as an insulator. The tap water, sea water contains some traces of salts and impurities, due to which it becomes good conductor of electricity.

Ch 11 : Light,Shadows & Reflections

CBSE Class 6 - Science - CH 11 - LIGHT, SHADOWS AND REFLECTIONS

Q1(MCQ): A body which emits light by itself is
(a) Luminous body
(b) Non luminous body
(c) Shadow
(d) Opaque body

Answer: (a) Luminous body

Q2: Fill in the Blanks
 
(i)  Object like the sun that give out or emit light of their own are called ______________ Object.
(ii)  Light travels in ______________ line.
(iii) _________________ are formed when an opaque object comes in the path of light
(iv) Polished surfaces produce ____________________ reflection which causes glare in our eyes.
(v)  ______________________objects allow light to pass through them completely.
(vi) ______________________ objects do not allow the light to pass through it at all.
(vii) _______________________ objects allow the light to pass through them partially.
(viii) Stars are ________________ sources of light.
(ix) Shadows are of two kinds named _________ and ____________.

Answer:
(i) luminuous
(ii) straight
(iii) Shadows
(iv) regular
(v) Transparent
(vi) Opaque
(vii) Translucent
(viii) natural
(ix) umbra, penumbra

Q3(NCERT): Rearrange the boxes given below to make a sentence that helps us understand opaque objects. 

Answer: OPAQUE OBJECTS MAKE SHADOWS


Q4: What are luminous objects? Give two examples.

Answer: Objects that emit their own light are called luminous objects. Stars, Sun, candle, torch are examples of luminous objects. The light emitted by luminous objects enables us to see things.

Q5: What are non-luminous objects? Give two examples.

Answer: The objects which do not emit light are called non-luminous objects. Table, chair, trees, moon are examples of non-luminous objects.

Q6: To see an object what do we need?

Answer: To see any non-luminous object we need the following:

• source of light
• an object
• eyes

When a light emitting from luminous body falls on a non-luminous object and is reflected. This reflected light reaches our eyes enables us to see that object.

Q7: Moon appears bright at night. Is it a luminous or non-luminous body?

Answer: Moon is a non-luminous body, it does not emit its own light. It reflects the sun light that falls on it.

Q8(NCERT): Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous:
Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, a piece of red hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, a sheet of cellophane, a wire mesh, kerosene stove, sun, firefly, moon.

Answer:

Object	Transparent /Translucent     /Opaque	Luminous/ Non-luminous
Air, Water	Transparent	Non-luminous
Piece of Rock, Sheet of Aluminium, Mirror, Wooden Board, CD, Umbrella, Wall, Sheet of Carbon Paper, Sheet of cardboard, Moon	Opaque	Non-luminous
A sheet of polythene, Smoke, Fog,  Sheet of cellophone, Wire-mesh,	Translucent	Non-luminous
A piece of Red hot iron, Light fluorescent tube, Lighted torch, Kerosene stove, Sun, firefly	Opaque	Luminous
Flame of gas burner	Translucent	Luminous

Q9: How shadows are formed? What are different types of shadows?

Answer: When some objects are placed in the path of light, a dark portion is formed on the opposite side of the objects. This dark portion is called shadow.
There are two types of shadows:

• umbra 
• penumbra.

The umbra is formed where no light reaches and it is a dark, black shadow.
The penumbra is formed where some light reaches and it is grey in color.

Q10: Do all objects cast shadow?

Answer: No. Only opaque objects cast shadow.


Q11: Which type of surfaces produce clear images?

Answer: Polished and plane reflecting surfaces produce clear image.


Q12(NCERT): Can you think of creating a shape that would give a circular shadow if held in one way and a rectangular shadow if held in another way?

Answer: A cylinder object can cast shadows in two ways. When the top circular view faces the sun, a circular shape shadow is formed. When its horizonatal side faces the sun, it casts a rectangular shadow.

Q13(NCERT):  In a completely dark room, if you hold up a mirror in front of you, will you see a reflection of yourself in the mirror?

Answer: To see the reflection, source of light is required We can only in the presence of light.

Q14: What is lateral inversion?

Answer: When an object is placed in front of a plane mirror, the right side of the object appears to be on the left side of image and left side of the object appears to be on the right side of image. This is called lateral inversion.


Q15: State the principle behind the working of a pinhole camera.

Answer: Light travels in straight line. This principle is behind the working of pinhole camera.


Q16: What are transparent objects?

Answer: The objects which allow light to pass through them are called transparent objects.

Q17: What are opaque objects?

Answer:  The objects which do not allow light to pass through them are called opaque objects.

Q18: What are translucent objects?

Answer: The objects which partially allow light to pass through them are called translucent objects.


Q19: What types of objects do not cast shadows?

Answer: Transparent objects and few translucent objects, because light passes through them.

Q20(MCQ): The image formed in pinhole camera is
(a) Inverted
(b) Erect
(c) Both a and b
(d) None of the above

Answer: (a) Inverted