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Question (31)

QN005623

Which gas is present in air in a greater amount than oxygen?

(A) Carbon dioxide
(B) Argon
(C) Nitrogen
(D) Water vapour

Correct Answer: C

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Question (32)

QN005624

If a room contains 600 litres of air, approximately how much nitrogen does it contain?

(A) 126 litres
(B) 468 litres
(C) 1260 litres
(D) 600 litres

Correct Answer: B

Explanation:

78% of 600 = 468 litres.

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Question (33)

QN005625

Which of the following would most likely stop working if there were no wind?

(A) Windmill
(B) Solar cooker
(C) Torch
(D) Battery-operated toy

Correct Answer: A

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Question (34)

QN005626

A student claims that air contains only oxygen because living beings need oxygen. Which statement is correct?

(A) The claim is correct
(B) Air contains oxygen and nitrogen only
(C) Air is a mixture of several gases
(D) Air contains oxygen and water only

Correct Answer: C

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Question (35)

QN005627

Out of 100 squares representing air, how many squares represent gases other than nitrogen and oxygen?

(A) 1
(B) 21
(C) 78
(D) 99

Correct Answer: A

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Question (36)

QN005628

Which statement best explains why a storm can rotate a firki faster than a breeze?

(A) Storms contain more oxygen
(B) Storms contain less nitrogen
(C) Air moves faster during a storm
(D) Storms increase the size of the firki

Correct Answer: C

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Question (37)

QN005629

If 21 litres of oxygen are present in a sample of air, the total volume of air is approximately:

(A) 21 litres
(B) 50 litres
(C) 100 litres
(D) 210 litres

Correct Answer: C

Explanation:

Oxygen is 21% of air.

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Question (38)

QN005630

Which observation provides evidence that air can cause movement?

(A) A closed bottle remains on a table
(B) Pages of an open book flutter when a fan is switched on
(C) A rock remains unchanged
(D) A pencil lies on a desk

Correct Answer: B

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Question (39)

QN005631

A container has 420 litres of oxygen. Assuming normal composition of air, the total air in the container is approximately:

(A) 1000 litres
(B) 2000 litres
(C) 420 litres
(D) 780 litres

Correct Answer: B

Explanation:

21% of 2000 = 420 litres.

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Question (40)

QN005632

Which statement about air is correct?

(A) Air contains only gases useful to humans
(B) Oxygen forms the largest part of air
(C) Nitrogen forms the largest part of air and oxygen is essential for survival
(D) Argon forms more than half of air

Correct Answer: C

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Question (31)

Which gas is present in air in a greater amount than oxygen?

Explanation:

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Question (32)

If a room contains 600 litres of air, approximately how much nitrogen does it contain?

Explanation:

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Question (33)

Which of the following would most likely stop working if there were no wind?

Explanation:

Link:

Question (34)

A student claims that air contains only oxygen because living beings need oxygen. Which statement is correct?

Explanation:

Link:

Question (35)

Out of 100 squares representing air, how many squares represent gases other than nitrogen and oxygen?

Explanation:

Link:

Question (36)

Which statement best explains why a storm can rotate a firki faster than a breeze?

Explanation:

Link:

Question (37)

If 21 litres of oxygen are present in a sample of air, the total volume of air is approximately:

Explanation:

Link:

Question (38)

Which observation provides evidence that air can cause movement?

Explanation:

Link:

Question (39)

A container has 420 litres of oxygen. Assuming normal composition of air, the total air in the container is approximately:

Explanation:

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Question (40)

Which statement about air is correct?

Explanation:

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