cbse 6th Standard Science Air Around Us Important Questions And Answers Study Material - QB365 Set A | QB365

6th Standard CBSE Syllabus & Materials

6th Standard CBSE

CBSE 6th Social Science The Value of Work - New Sample Question Papers Study Material - QB365 Set A

NEW

6th Standard CBSE

CBSE 6th Social Science Family and Community - New Sample Question Papers Study Material - QB365 Set A

NEW

6th Standard CBSE

CBSE 6th Social Science India's Cultural Roots - New Sample Question Papers Study Material - QB365 Set A

NEW

6th Standard CBSE

CBSE 6th Social Science India,That is Bharat - New Sample Question Papers Study Material - QB365 Set A

NEW

6th Standard CBSE

CBSE 6th Social Science Timeline and sources of history - New Sample Question Papers Study Material - QB365 Set A

NEW

6th Standard CBSE

CBSE 6th Social Science Oceans and Continents - New Sample Question Papers Study Material - QB365 Set A

cbse 6th Standard Science Air Around Us Important Questions And Answers Study Material - QB365 Set A

Published on: 24/10/2025

Question Set A

cbse 6th Standard Science Air Around Us Important Questions And Answers Study Material - QB365

Download CBSE Class 6th Standard CBSE Science question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 6th Standard CBSE Science

Questions + Answers key

Take MCQ Science Test

QB365 Student Learing Managemnet System

Std: 6th Standard CBSE - Science

chapter: Air Around Us - Important Questions And Answers

Visit QB365-SLMS - https://www.qb365.in/slms/ Complete Questions and Answers

Questions:

Generic 3

5 x 3 = 15

(a) Name one process which removes carbon dioxide from air.
(b) Suggest two processes which put back carbon dioxide into air.

On a Sunday morning, Paheli's friend visited her home. She wanted to see some flowering plants in the nearby garden. Both of them went to the garden. While returning from the garden, they also observed some flowering plants on the roadside. But to their surprise, they found that the leaves and flowers of these roadside plants were comparatively very dull. Can you help them to know why?

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. Help Garima to know why it so happened?

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

Which gas in the atmosphere is essential for respiration?

Generic 2

5 x 2 = 10

Carbon dioxide gas is used to extinguish fire. Give reason.

Due to the presence of which gas, when air is passed through lime water turns it milky?

In a number of musical instruments, air plays an important role. Can you name some such instruments?

State one biological importance of air dissolved in water.

10.

Gases are present in certain ratios in air. Can you tell the relative proportions of nitrogen and oxygen in air?

Generic 5

2 x 5 = 10

11.

Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil. She boiled the water for about 5 min and filled it in a bottle upto the brim and kept the bottle airtight till cooled down to room temperature.
(a) Why did the tiny bubbles appeared?
(b) Do you think tiny bubbles will appear on heating the water taken out from the bottle? Justify your answer.

12.

Humans and animals use oxygen for respiration and plants require carbon dioxide for photosynthesis. How are these two processes related?

True or False

5 x 1 = 5

13.

Respiration can occur only in the presence of nitrogen

(a)

True

(b)

False

14.

Atmosphere is essential for life on the earth.

(a)

False

(b)

True

15.

The composition of air is always exactly the same

(a)

True

(b)

False

16.

Air helps in the movements of sailing yachts and gliders but plays no role in the flight of birds and aeroplanes.

(a)

True

(b)

False

17.

Plants produce oxygen during the process of making their own food.

(a)

False

(b)

True

Match the following

5 x 1 = 5

18.

Air

19.

Carbon dxioide

20.

Nitrogen

21.

Smoke

22.

Mountaineers

Fill up / 1 Marks

4 x 1 = 4

23.

Air helps in the dispersal of ____ and _______ of flowers of several plants.

24.

Aquatic animals use dissolved ________ in water for respiration

25.

The component of air used by green plants to make their food is _________

26.

A weather cock shows the ________ in which the air is moving at that place.

Multiple Choice Question

5 x 1 = 5

27.

Which of the following statements is incorrect?

(a)

All living things require air to breathe

(b)

We can feel air but we cannot see it

(c)

Moving air makes it possible to fly a kite

(d)

Air is present everywhere but not in soil

28.

Wind does not help in the movement of which of the following?

(a)

Firki

(b)

Weather cock

(c)

ceiling fan

(d)

Sailing yacht

29.

Mountaineers carry oxygen cylinders with them because

(a)

there is no oxygen on high mountains

(b)

there is deficiency of oxygen on mountains at higher altitude

(c)

oxygen is used for cooking

(d)

oxygen keeps them warm at low temperature

30.

Which of the following components of air is present in the largest amount in the atmosphere?

(a)

Nitrogen

(b)

Oxygen

(c)

Water vapour

(d)

Carbon dioxide

31.

About one fifth of ordinary air is

(a)

nitrogen

(b)

carbon dioxide

(c)

water vapour

(d)

oxygen

Visit QB365-SLMS - https://www.qb365.in/slms/

Answers Key:

Generic 3

5 x 3 = 15

(a) Photosynthesis by plants.
(b) Respiration by plants and animals and burning of fuels.

The leaves and flowers of the roadside plants are very dull because the air along the roadside is polluted with air pollutants due to emissions from vehicles and industries, etc.
Thus, the roadside plants had probably some dust and soot deposited on them. This made them appear dull.

Air is dissolved in water in the form of oxygen. When water bottle is left in the open sunlight, tiny bubbles were formed all around inside the bottle because air dissolved in water starts escaping in the form of tiny bubbles due to heat from the sun.

There is an interdependence of plants and animals on each other for exchange of gases. Plants take carbon dioxide from the atmosphere and prepare food. This is called photosynthesis. During this process, plants give out oxygen to the atmosphere. Animals inhale this oxygen and gives out carbon dioxide to the atmosphere. Therefore, plants and animals help each other in the exchange of gases in the atmosphere.

Oxygen is essential for respiration.

Generic 2

5 x 2 = 10

Carbon dioxide does not support combustion. When sprayed on burning object, it stops the supply of oxygen and extinguishes fire.

Carbon dioxide turns lime water milky. It is a constituent of air.

Air plays an important role in number of musical instruments such as flute, trumpet harmonium.

Dissolved air helps aquatic animals for breathing.

10.

Nitrogen and oxygen are present in the ratio of 4: 1 by volume in air.

Generic 5

2 x 5 = 10

11.

(a) Air is dissolved in water in the form of oxygen. Tiny bubbles are formed, when air present in the water escape on boiling it. So, tiny bubbles appeared due to the evolution of air dissolved in water.
(b) No, tiny bubbles will not appear as there is no dissolved air in this water.

12.

Humans and animals use oxygen present in the environment to carry out respiration and release CO₂ as a by- product of this process. Plants perform photosynthesis by using this CO₂ present in the atmosphere accumulated due to activities of humans and animals. They release oxygen as their reaction by product which also gets out in the atmosphere. Plants depend on humans and the activities performed by them like burning of fuels, etc for CO₂ and humans depend on plants for a continuous oxygen supply. Thus, these two processes maintain a unique balance between O₂ and CO₂ concentration in our environment.

True or False

5 x 1 = 5

13.