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Composition of Atmosphere MCQs with Answers

Includes 3 past paper MCQs (marked).

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Composition of Atmosphere MCQs (11–20)

10 MCQs with answers and a short one-liner. Hide answers to test yourself.

Past paper MCQs in this chapter · See all past papers

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11.
Which noble gas is present in the atmosphere at about 0.9%?
Correct Answer: C. Argon
One-liner
Argon is the noble gas present in the Earth's atmosphere at about 0.9%.
12.
Past Paper MCQ
What is the approximate percentage of oxygen in atmospheric air?
Correct Answer: B. 21%
One-liner
The approximate percentage of oxygen in atmospheric air is 21%.
13.
The most abundant constituent in Air is ?
Correct Answer: C. Nitrogen
One-liner
The most abundant constituent in air is Nitrogen, which makes up about 78% of the Earth's atmosphere by volume.
14.
The air contains _?
Correct Answer: D. All of these
One-liner
Air contains all of these — nitrogen, oxygen, and carbon dioxide — along with other gases.
15.
Carbon dioxide inhaled in air is approximately _?
Correct Answer: A. 0.04%
One-liner
Carbon dioxide in inhaled (atmospheric) air is approximately 0.04% (400 ppm).
16.
Which one of the following gases is present in the atmosphere in the highest amount?
Correct Answer: B. Nitrogen
One-liner
Nitrogen is the most abundant gas in the Earth's atmosphere, making up about 78% of it.
17.
Which gas is present in air with highest percentage?
Correct Answer: C. Nitrogen
One-liner
Nitrogen is the most abundant gas in the air, making up about 78% of the atmosphere.
18.
The major component of troposphere is ?
Correct Answer: B. Nitrogen
One-liner
The major component of the troposphere is Nitrogen, which makes up about 78% of the air by volume.
19.
Past Paper MCQ
The most abundant component in Earth's atmosphere (or Air) is?
Correct Answer: C. Nitrogen
One-liner
The most abundant component in Earth's atmosphere is Nitrogen, which makes up about 78% of the air by volume.
20.
Which of the following gases is least common in air?
Correct Answer: C. Hydrogen
One-liner
Hydrogen is the least common gas in air among the given options, as it is present only in trace amounts (about 0.00005% by volume).

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Composition of Atmosphere MCQs with Answers

Composition of Atmosphere MCQs (11–20)

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