Air around Us Test

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Air around Us Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

The correct ascending order of gases as per their composition in air is:

A
oxygen < carbon dioxide < nitrogen

B
hydrogen < oxygen < nitrogen

C
nitrogen < hydrogen < oxygen

D
oxygen < carbon dioxide < hydrogen

Solution

By volume dry air contains $$78.09\%$$ Nitrogen, $$20.95\%$$ Oxygen, $$0.93\%$$ Argon, $$0.04\%$$ Carbon dioxide and small traces of other gases.
Ascending order of gases as per their composition in air is-
Hydrogen $$<$$ Oxygen $$<$$ Nitrogen
Question 2
1 / -0

Air is regarded as a mixture because:

A
its pressure may vary

B
its temperature may change

C
its volume changes under different conditions

D
its composition may vary

Solution

Air is composed of various gases in different proportions which can be separated using physical methods.
Question 3
1 / -0

Which is the most abundant gas in our atmosphere ?

A
Nitrogen

B
Oxygen

C
Carbon dioxide

D
Carbon monoxide

Solution

Nitrogen (78%) and oxygen (21%) are two gases that make up the bulk of the atmosphere. Carbon dioxide, helium, ozone, argon and water vapour make up 1% of the rest of the atmosphere. Carbon monoxide is not a part of our atmosphere.
Question 4
1 / -0

Which of the following gases burns in air?

A
Nitrogen

B
Carbon dioxide

C
Carbon monoxide

D
Helium

Solution

Out of the given options, nitrogen, carbon dioxide, and helium do not burn in the air. But carbon monoxide burns in the air to produce carbon dioxide.
Question 5
1 / -0

The percentage of nitrogen and oxygen in air is:

A
21% by volume

B
50% by weight

C
37% by weight

D
99% by volume

E
29% by volume

Solution

Nitrogen and oxygen together make up 99% of air.
Question 6
1 / -0

What is the major constituent of air?

A
Hydrogen

B
Oxygen

C
Nitrogen

D
Water vapour

Solution

The major constituent of air is nitrogen. Air consists of 78% nitrogen, 21% oxygen and 1% of other gases, dust, impurities, water vapour.
Question 7
1 / -0

A greenhouse gas that absorbs energy and maintains earth's temperature is:

A
carbon dioxide

B
oxygen

C
nitrogen

D
argon

Solution

A greenhouse gas that absorbs energy and maintains the earth's temperature is carbon dioxide $$(CO_2)$$. Other greenhouse gases are methane $$(CH_4)$$, nitrous oxide $$(N_2O)$$, and chloro-fluoro-carbon$$(CFC)$$.
Question 8
1 / -0

Carbon dioxide constitutes nearly ___ % of the atmosphere.

A
45

B
78

C
21

D
0.03

Solution

Carbon dioxide constitutes nearly 0.03% of the atmosphere.
Question 9
1 / -0

Combustion can not take place without:

A
water

B
carbon

C
air

D
zinc

Solution

Combustion can not take place without air. Air contains about 21% by volume of oxygen. Oxygen is essential for combustion to occur.
Question 10
1 / -0

Which of these statements are true about air?
(i) Air is a mixture of several types of gases.
(ii) Air exerts pressure.
(iii) The composition of air is constant in the atmosphere.

A
(i) and (ii)

B
(ii) and (iii)

C
(i) and (iii)

D
(i), (ii) and (iii)

Solution

Air is mixture of several gases like nitrogen, oxygen and carbon dioxide.
As air is like gas it exerts pressure.
The composition of air varies in the atmosphere.

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Air around Us Test - 6

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Air around Us Test - 6

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SHARING IS CARING

Question 1

oxygen < carbon dioxide < nitrogen

hydrogen < oxygen < nitrogen

nitrogen < hydrogen < oxygen

oxygen < carbon dioxide < hydrogen

Solution

Question 2

its pressure may vary

its temperature may change

its volume changes under different conditions

its composition may vary

Solution

Question 3

Nitrogen

Oxygen

Carbon dioxide

Carbon monoxide

Solution

Question 4

Nitrogen

Carbon dioxide

Carbon monoxide

Helium

Solution

Question 5

21% by volume

50% by weight

37% by weight

99% by volume

29% by volume

Solution

Question 6

Hydrogen

Oxygen

Nitrogen

Water vapour

Solution

Question 7

carbon dioxide

oxygen

nitrogen

argon

Solution

Question 8

45

78

21

0.03

Solution

Question 9

water

carbon

air

zinc

Solution

Question 10

(i) and (ii)

(ii) and (iii)

(i) and (iii)

(i), (ii) and (iii)

Solution

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