Class 6 Science Chapter 11 Air Around Us.
THIS PAGE INCLUDES :
- CHAPTER OVERVIEW -
These Topics are covered in NCERT Class 6 Science Chapter 11 Air Around Us.
# Atmosphere.
# Components Of Air.
# Carbon Dioxide.
# Oxygen.
# Nitrogen.
# Smoke.
# Windmill.
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Which includes :-
# Class 6 Science Chapter 11 Explanation.
# Class 6 Science Chapter 11 Important Questions.
# NCERT Solutions :
Class 6 Science Chapter 11 NCERT Solutions are completely based on NCERT Book for Class 6 Science Chapter 11 Air Around Us. These NCERT Solutions for Class 6 Science Chapter 11 Air Around Us contains Answers and detailed explanation of Questions talked about in NCERT Class 6 Science Chapter 11 Air Around Us. Here we suggest you to go through these Class 6th Science Chapter 11 NCERT Solutions thoroughly to strengthen you understanding about this Chapter of Class 6 Science.NCERT Solutions for Class 6 Science Chapter 11 - Q1.
Q1. What is the composition of air?
Ans. Air comprises water vapour, Oxygen, Nitrogen, Carbon dioxide, dust and smoke.
NCERT Solutions for Class 6 Science Chapter 11 - Q2.
Q2. Which gas in the atmosphere is essential for respiration?
Ans. Oxygen in the atmosphere is essential for respiration.
NCERT Solutions for Class 6 Science Chapter 11 - Q3.
Q3. How will you prove that air supports burning?
Ans. Place two candles of the same length on a table. Light both the candles. Cover one of the candles with an inverted glass tumbler. We observe that the candle covered with a glass tumbler got extinguished after some time, whereas the other candle continued burning. The candle gets extinguished because the component inside of the glass tumbler, which supports burning, is limited. Most of the component is used up by the burning candle. However, the other candle is getting continued supply of air. This component of air, which supports burning, is known as oxygen.
NCERT Solutions for Class 6 Science Chapter 11 - Q4.
Q4. How will you show that air is dissolved in water?
Ans. Take some water in a container. Heat it slowly on a tripod stand. Before water begins to boil, look at the inner surface of the container. We observe tiny bubbles inside.
These bubbles come from the air dissolved in water. When you heat the water, to begin with, the air dissolved in it escapes. This experiment concludes air is present in the water.
NCERT Solutions for Class 6 Science Chapter 11 - Q5.
Q5. Why does a lump of cotton wool shrink in water?
Ans. The lump of cotton wool shrink in water because the air inside the cotton lumps are replaced by water which makes the layer stick together.
NCERT Solutions for Class 6 Science Chapter 11 - Q6.
Q6. The layer of air around the earth is known as Atmosphere .
NCERT Solutions for Class 6 Science Chapter 11 - Q7.
Q7. The component of air used by green plants to make their food, is Carbon Dioxide .
NCERT Solutions for Class 6 Science Chapter 11 - Q8.
Q8. List five activities that are possible due to the presence of air.
Ans. Activities that are possible due to air are:
(a) Photosynthesis
(b) Cloud formation
(c) Respiration
(d) Transpiration
(e) Winnowing
NCERT Solutions for Class 6 Science Chapter 11 - Q9.
Q9. How do plants and animals help each other in the exchange of gases in the atmosphere?
Ans. During the process of respiration, animals and plants consume oxygen from the air and release carbon dioxide gas in the air. But green plants also release oxygen gas by utilizing carbon dioxide during the process of photosynthesis. Hence, in this way, plants and animals help each other in the exchange of gases in the atmosphere.
Here at MSEducator.in you get Complete FREE Study Material for Class 6 Science Chapter 11 Air Around Us.
Which includes :-
# Class 6 Science Chapter 11 Explanation.
# Class 6 Science Chapter 11 Important Questions.
# Chapter Notes :
Class 6 Science Chapter 11 Air Around Us Notes pdf which includes Class 6 Science Chapter 11 Air Around Us Notes. These Class 6 Science Chapter 11 Notes pdf are completely based on NCERT Book for Class 6 Science Chapter 11 Air Around Us. These notes contains detailed explanation of 6th class science Chapter 11 Air Around Us. I suggest you to go through these Notes to strengthen you understanding about this Chapter of Class 6 Air Around Us.Class 6 Science Chapter 11 notes.
Here at MSEducator.in you get Complete FREE Study Material for Class 6 Science Chapter 11 Air Around Us.
Which includes :-
# Class 6 Science Chapter 11 Explanation.
# Class 6 Science Chapter 11 Important Questions.
# Extra Questions :
Class 6 Science Chapter 11 Extra Questions are completely based on NCERT Book for Class 6 Science Chapter 11 Air Around Us. These Extra Questions contains detailed explanation or Definition of some Terms talked about in NCERT Class 6 Science Chapter 11 Air Around Us. You also get some short questions and long questions regarding Chapter 11 Air Around Us of class 6 Science and Some Value Based Questions regarding NCERT Class 6 Science Chapter 11 Air Around Us. Here we suggest you to go through these Class 6th Science Chapter 11 Extra Questions to strengthen you understanding about this Chapter of Class 6 Science.
# Class 6 Science Chapter 11 - Definitions :
Q. Define oxygen cycle.
Ans. The cycle of consumption of oxygen by respiration and its release by photosynthesis is called oxygen cycle.
Q. Define atmosphere?
Ans. The thin layer of air that surrounds the earth as an envelope is called atmosphere.
Class 6 Science Chapter 11 Extra Questions.
Here at MSEducator.in you get Complete FREE Study Material for Class 6 Science Chapter 11 Air Around Us.
Which includes :-
# Class 6 Science Chapter 11 Explanation.
# Class 6 Science Chapter 11 Important Questions.
# Class 6 Science Chapter 11 - Very Short Answer Questions :
Q. As we go higher up in the atmosphere the air gets :
Ans. Thinner
Q. The most abundant gas present in the atmosphere is :
Ans. Nitrogen
Q. The process of absorbing carbon dioxide from air and preparing the food by plants is called ?
Ans. photosynthesis
Q. The layer of gases around the Earth is called ?
Ans. Atmosphere
Q. What percent of oxygen does Air contains ?
Ans. 21 %
Q. Hot air balloon rises up in the air because ?
Ans. Hot air is lighter than cold air.
Q. Name some musical instruments in which air plays an important role.
Ans. Flute, saxophone, trumpet, horn, etc.
Q. What do human beings release during respiration?
Ans. Co2
Q. Name the layer of air that surrounds the earth.
Ans. Atmosphere
Q. What condition is necessary for combustion to take place?
Ans. Presence of air
Q. Which component of air acts as a non-supporter of Combustion?
Ans. Carbon dioxide.
Q. What is moving air called?
Ans. Moving air is called wind.
Q. Which gas is the major component of air? State its composition.
Ans. Nitrogen gas (78%)
Q. Name a device which uses wind energy to generate electricity.
Ans. Windmill
Class 6 Science Chapter 11 Extra Questions.
Here at MSEducator.in you get Complete FREE Study Material for Class 6 Science Chapter 11 Air Around Us.
Which includes :-
# Class 6 Science Chapter 11 Explanation.
# Class 6 Science Chapter 11 Important Questions.
# Class 6 Science Chapter 11 - Short Answer Questions :
Q. Define atmosphere? Name two processes which maintain the balance of Carbon dioxide and Oxygen in the atmosphere.
Ans. Our earth is surrounded by a thin layer of air. This layer is called atmosphere. Two processes which maintain the balance of Carbon dioxide and Oxygen in the atmosphere are: photosynthesis and respiration.
Q. Give any three uses of air?
Ans.
(a) It helps in respiration.
(b) It helps in combustion.
(c) It helps in photosynthesis.
Q. Why do mountaineers carry oxygen cylinders with them while climbing high up the mountains?
Ans. It is because when they climb mountains, as altitude increases, the amount of oxygen level in the atmospheric air decreases as trees are not found at higher altitudes.
Q. Why do fish die when taken out of water ?
Ans. Fish has gills and can take oxygen only dissolved in water for respiration. It does not have the capacity to take oxygen from the air, therefore fish die when taken out of water.
Q. When we pour water on a dry lump of soil, bubbles come out of it.
Ans. It is because air is present in between the space of soil particles. On pouring water, water takes the place of air and air comes out as bubbles. This shows that air is present in the soil.
Q. Why do earthworms and ants come out of soil during rainy season?
Ans. During the rainy season, the soil pores and the worm burrows fill with water. The earthworms and ants can't get enough oxygen when the soil is flooded, so they come to the surface to breathe.
Q. Can air be used to extinguish fire?
Ans. Yes. Carbon dioxide present in the air is the non-supporter of oxygen and can be used to extinguish fire.
Q. How can you say that air contains dust particles?
Ans. In the morning, if we examine the beam of light entering our room, we will notice tiny particles floating in air. These are dust particles. Hence, we can say that air contains dust particles.
Q. Why does the traffic policeman wear the mask when he is standing at the busy traffic area?
Ans. The policemen wear a mask while regulating traffic in a crowed area to stop the entry of the dust and smoke from vehicles into the lungs during breathing. The entry of smoke and dust may cause harm to lungs.
Q. Why we should not sleep under the trees during night ?
Ans. We should not sleep under the trees during night because during night plant releases more carbon dioxide due to more respiration.
Q. Are respiration and breathing same?
Ans. Breathing is just the intake of oxygen and giving out carbon dioxide.
Respiration is a chemical process which generates energy in body.
Q. Why air is considered as mixture?
Ans. Air contains oxygen and nitrogen as its major constituents along with carbon dioxide, and other gases. These gases retain their properties in air. So, the air is called a mixture.
Q. Why do we feel suffocated in a closed room if something is burning there?
Ans. We feel suffocated in a closed room if some material is burning there because burning causes excess of carbon dioxide and its accumulation causes suffocation.
Q. What is the importance of oxygen in daily life?
Ans. Oxygen plays a very important role in our daily life. Some of these are:
As ozone, it provides a blanket in the atmosphere which protects us from harmful ultraviolet radiations emitted by the sun.
It is used for breathing and as a breathing aid in hospitals, airplanes, and by deep-sea divers and astronauts
Q. How does oxygen become available to the animals in water and soil?
Ans. Air remains dissolved in water. Air is also present between the particles of soil. Hence animals living there get oxygen.
Q. What will happen if the amount of oxygen is increased in the air?
Ans. Air will become more combustible and many substances may undergo fast oxidation.
Q. Why during an incident of fire, one is advised to wrap a woolen blanket over a burning object.
Ans. Air is supporter of combustion. To cut-off the supply of air from the burning object it is advised to wrap a woolen blanket around it.
Q. What is the importance of water vapour in air?
Ans. When air comes in contact with a cool surface, it condenses and forms tiny drops of water on the cooled surfaces. The presence of water vapour in the air is important for maintaining the water cycle in nature. This is because it is water vapour present in the air which rises high in the sky along with hot air, get cooled, condenses to form clouds and then brings rain on the earth.
Q. Explain briefly carbon dioxide gas and its properties.
Ans. Carbon dioxide is a colorless and odorless gas. It is soluble in water. It neither burns nor supports burning. Co2 extinguishes a burning fire. Plants and animals consume oxygen for respiration and produce Co2 which is necessary for photosynthesis. It is an important greenhouse gas.
Q. Why the animals living deep inside the soil come out during heavy rains?
Ans. The air is present in spaces between particles of soil. Animal living inside the soil get oxygen for breathing (or respiration) from the air present between the soil particles. However, when it rains heavily water fills up the spaces occupied by the air in the soil.
In this situation, the animals living inside the soil have to come out of the soil to obtain air for breathing. For example, the earthworms come out of the soil only during heavy rains.
Q. Why we must always breathe in through our nose and not by our mouth?
Ans. We inhale air when we breathe through our nostrils. We also know that air contains dust particles. To prevent dust particles from getting into the respiratory system, fine hair and mucus are present inside the nose.
Since our mouth does not contain the above-discussed barriers of dust, so if we breathe through it, dust particles may enter in our respiratory tract. This is why breathing through mouth is not suggested
Q. Why long chimneys are present in factories?
Ans. Most of the factories produces harmful smoke and gases. So factories have long chimneys to carry these harmful gases away from our noses.
Q. How nature maintains a balance of Co2 and o2 in atmosphere?
Ans. Plant releases oxygen which is consumed by animals in the process of respiration. Animals release carbon dioxide which is consumed by the plants for the process of photosynthesis.
Class 6 Science Chapter 11 Extra Questions.
Here at MSEducator.in you get Complete FREE Study Material for Class 6 Science Chapter 11 Air Around Us.
Which includes :-
# Class 6 Science Chapter 11 Explanation.
# Class 6 Science Chapter 11 Important Questions.
# Class 6 Science Chapter 11 - Long Answer Questions :
Q. How is air important for life on the earth?
Ans. Air helps in the movements of sailing yachts, gliders, parachutes and airplanes. Birds, bats and insects can fly due to the presence of air. Air also helps in the dispersal of seeds and pollen of flowers of several plants. Air plays an important role in water cycle. Thus air is important for life on the earth.
Q. What is the importance of the presence of carbon dioxide in the atmosphere? What will happen if its concentration in the air increases?
Ans. Carbon dioxide has the property of absorbing heat rays called infrared rays. Nature has a balance of carbon dioxide in the atmosphere, thus giving an optimum warmth to the atmosphere. The increase in the concentration of carbon dioxide in the air would cause increase in the temperature of the earth and would ultimately lead to melting of glaciers causing floods etc. This phenomenon is called global warming.
Q. Why are fine hair and mucus present in our nostrils? Why should we not breathe in by mouth?
Ans. We inhale air when we breathe through our nostrils. We also know that air contains dust particles. To prevent dust particles from getting into the respiratory system, fine hair and mucus are present inside the nose.
Since, our mouth does not contain the above discussed barriers of dust, so if we breathe through it, dust particles may enter in our respiratory tract. That is why breathing through mouth is not suggested.
Q. What are the properties of air?
Ans. Properties of Air are :
(a) Air occupies space.
(b) Air is present everywhere around us.
(c) Air has no colour and one can see through it.
(d) It is transparent.
(e) It is compressible
(f) It is soluble in water
(g) It has mass
Q. What are the uses of air?
Ans. Air is useful to human beings in many ways. Some of the important uses of air are as follows:
(a) It is used for breathing purpose.
(b) It is used for burning fuels to make fire.
(c) It helps the birds, bats and insects in flying.
(d) It plays an important role in the water cycle in nature.
(e) Compressed air is used in tyres of various kinds of vehicles.
(f) It also helps in the dispersal of seeds and pollens of flowers of several plants.
Class 6 Science Chapter 11 Extra Questions.
Here at MSEducator.in you get Complete FREE Study Material for Class 6 Science Chapter 11 Air Around Us.
Which includes :-
# Class 6 Science Chapter 11 Explanation.
# Class 6 Science Chapter 11 Important Questions.
# Class 6 Science Chapter 11 - Value Based Questions :
Q. Anne learnt in her school that bursting of crackers pollutes the environment and contributes to global warming. She promised her family not to burst crackers on Diwali.
(a). How does bursting of crackers pollute the environment?
Ans. Harmful smoke comes out from the crackers which on accumulation in large amounts causes air pollution.
(b) Which moral value is exhibited by Anne?
Ans. She is an environment-friendly person.
Q. Garima observed that when she left her tightly capped bottle full of water in the open sunlight, tiny bubbles were formed all around inside the bottle. She was amazed and asked about this phenomenon to her science teacher.
(a) Why Garima observed tiny bubbles inside the bottle?
Ans. As the water in the bottle get warm due to the heat of sunlight air dissolved in it escaped and appeared as tiny bubbles.
(b) What will happen to the bubbles if we bring it back to normal room temperature?
Ans. Tiny bubbles will again disappear in the water.
(c) When do we see the above phenomenon in nature and what is its significance?
Ans. We see the above phenomenon in summer season when oxygen dissolved in water reduces due to hot temperature and because of this aquatic life suffers.
(d) What values of Garima is shown here?
Ans. Garima is observable, intelligent, curious girl with scientific temperament.
Q. While going for a local excursion to a deserted area, Vikas wore a mask. When boarding the school bus his friends made fun of him that he was looking odd and beside enjoying he is taking extra precautions. But when going through the dry roads all of his friends felt the need of the mask. He suggested everyone to tie handkerchief on their nose. It helped them a lot.
(a) What is dust?
Ans. Dust is tiny particles of earth or waste lying on ground or carried by the air.
(b) What are the health issues related with dust?
Ans. Dust particles badly effects our respiratory system. It may cause asthma, allergy, respiratory problems, etc.
(c) How does a mask help?
Ans. Mask acts as a barrier for the entry of dust particles directly into our nose. It filters the air.
(d) What values of Vikas is shown here?
Ans. Vikas is intelligent, helpful and have future vision.
Class 6 Science Chapter 11 Extra Questions.
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Which includes :-
# Class 6 Science Chapter 11 Explanation.
# Class 6 Science Chapter 11 Important Questions.
Air Around Us class 6 mcq
# MCQ Test :
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