Air Around Us Practice Questions

Class 6 · Science · 1183 free MCQs with instant results and detailed explanations.

1183

Total

367

Easy

576

Medium

240

Hard

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Topics in Air Around Us

Composition of Air 407

Properties of Air 369

Uses of Air 407

Sample Questions from Air Around Us

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Easy

What percentage of air is made up of nitrogen?

A. 78%

B. 21%

C. 1%

D. 50%

Show Answer & Explanation

Correct Answer: A

Nitrogen makes up about 78% of the Earth's atmosphere, making it the most abundant gas.

Easy

Which gas is essential for human respiration?

A. Carbon Dioxide

B. Oxygen

C. Hydrogen

D. Nitrogen

Show Answer & Explanation

Correct Answer: B

Oxygen is crucial for humans to breathe and is required for cellular respiration.

Easy

Which gas is produced when we exhale?

A. Oxygen

B. Nitrogen

C. Carbon Dioxide

D. Helium

Show Answer & Explanation

Correct Answer: C

Carbon Dioxide is produced as a waste product when we breathe out air after using oxygen.

Medium

What is the primary gas present in the air we breathe?

A. Oxygen

B. Nitrogen

C. Carbon Dioxide

D. Hydrogen

Show Answer & Explanation

Correct Answer: B

Nitrogen constitutes about 78% of the atmosphere, making it the most abundant gas.

Medium

Which of the following statements about carbon dioxide in air is true?

A. It is essential for human respiration.

B. It makes up a large portion of the air.

C. It is a greenhouse gas.

D. It is the most abundant gas.

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Correct Answer: C

Carbon dioxide is a greenhouse gas that helps trap heat in the atmosphere.

Medium

In addition to nitrogen and oxygen, which gas is present in trace amounts in the atmosphere?

A. Neon

B. Argon

C. Helium

D. Chlorine

Show Answer & Explanation

Correct Answer: B

Argon is present in about 0.93% of the atmosphere, making it a trace gas.

Medium

What is the approximate percentage of oxygen in the air?

A. 21%

B. 31%

C. 11%

D. 41%

Show Answer & Explanation

Correct Answer: A

Oxygen accounts for about 21% of the Earth's atmosphere.

Hard

If a balloon filled with air is brought to a higher altitude, what is likely to happen to its size?

A. It will expand

B. It will shrink

C. It will explode

D. It will remain the same

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Correct Answer: A

At higher altitudes, the atmospheric pressure decreases, allowing the balloon to expand due to the lower external pressure.

Hard

Which of the following gases contributes to the greenhouse effect in the atmosphere?

A. Nitrogen

B. Oxygen

C. Carbon Dioxide

D. Hydrogen

Show Answer & Explanation

Correct Answer: C

Carbon Dioxide traps heat in the atmosphere, contributing significantly to the greenhouse effect and global warming.

Q10

Hard

What percentage of air is composed of nitrogen?

A. 21%

B. 78%

C. 1%

D. 50%

Show Answer & Explanation

Correct Answer: B

Nitrogen makes up approximately 78% of the Earth's atmosphere, making it the most abundant gas.

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Air Around Us — Class 6 Science Practice Questions Online

This page contains 1183 practice MCQs for the chapter Air Around Us in Class 6 Science. The questions are organized by difficulty — 367 easy, 576 medium, 240 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 3 topics, giving you comprehensive coverage of the entire chapter.