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Question (1)

QN005593

Which gas present in air is essential for the survival of humans and most living beings?

(A) Nitrogen
(B) Oxygen
(C) Argon
(D) Carbon dioxide

Correct Answer: B

Explanation:

The body needs oxygen to perform its functions.

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Question (2)

QN005594

What is moving air called?

(A) Breeze
(B) Storm
(C) Wind
(D) Cyclone

Correct Answer: C

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Question (3)

QN005595

Which gas occupies the largest percentage of air?

(A) Oxygen
(B) Carbon dioxide
(C) Nitrogen
(D) Argon

Correct Answer: C

Explanation:

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Question (4)

QN005596

Air is best described as a ________.

(A) Pure substance
(B) Single gas
(C) Mixture of gases
(D) Liquid

Correct Answer: C

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Question (5)

QN005597

If air is represented by 100 equal squares, how many squares represent oxygen?

(A) 1
(B) 21
(C) 78
(D) 79

Correct Answer: B

Explanation:

Oxygen forms 21% of air.

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Question (6)

QN005598

Out of 200 equal parts of air, approximately how many parts would be nitrogen?

(A) 78
(B) 122
(C) 156
(D) 178

Correct Answer: C

Explanation:

78% of 200 = 156.

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Question (7)

QN005599

A student holds her breath for a long time and starts feeling uncomfortable. What is the main reason?

(A) Lack of nitrogen
(B) Lack of argon
(C) Lack of oxygen
(D) Lack of water vapour

Correct Answer: C

Explanation:

The body does not get enough oxygen.

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Question (8)

QN005600

Which observation shows the presence of air around us?

(A) A stone lying still
(B) A closed notebook on a table
(C) Leaves rustling on a tree
(D) A wall standing upright

Correct Answer: C

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Question (9)

QN005601

If a container holds 500 litres of air, approximately how much oxygen does it contain?

(A) 21 litres
(B) 79 litres
(C) 105 litres
(D) 210 litres

Correct Answer: C

Explanation:

21% of 500 = 105 litres.

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Question (10)

QN005602

Which of the following is present in air in the greatest amount?

(A) Oxygen
(B) Carbon dioxide
(C) Nitrogen
(D) Other gases

Correct Answer: C

Explanation:

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Question (1)

Which gas present in air is essential for the survival of humans and most living beings?

Explanation:

Link:

Question (2)

What is moving air called?

Explanation:

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Question (3)

Which gas occupies the largest percentage of air?

Explanation:

Link:

Question (4)

Air is best described as a ________.

Explanation:

Link:

Question (5)

If air is represented by 100 equal squares, how many squares represent oxygen?

Explanation:

Link:

Question (6)

Out of 200 equal parts of air, approximately how many parts would be nitrogen?

Explanation:

Link:

Question (7)

A student holds her breath for a long time and starts feeling uncomfortable. What is the main reason?

Explanation:

Link:

Question (8)

Which observation shows the presence of air around us?

Explanation:

Link:

Question (9)

If a container holds 500 litres of air, approximately how much oxygen does it contain?

Explanation:

Link:

Question (10)

Which of the following is present in air in the greatest amount?

Explanation:

Link:

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