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Question (11)

QN005603

What percentage of air is made up of argon, carbon dioxide and other gases together?

(A) 21%
(B) 78%
(C) 1%
(D) 10%

Correct Answer: C

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Question (12)

QN005604

A firki rotates when a child runs while holding it because of:

(A) Gravity
(B) Heat
(C) Wind
(D) Magnetism

Correct Answer: C

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Question (13)

QN005605

Out of 1000 litres of air, approximately how much nitrogen is present?

(A) 210 litres
(B) 780 litres
(C) 10 litres
(D) 220 litres

Correct Answer: B

Explanation:

78% of 1000 = 780 litres.

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Question (14)

QN005606

Which gas in air is directly used by the body during breathing?

(A) Nitrogen
(B) Oxygen
(C) Argon
(D) Helium

Correct Answer: B

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Question (15)

QN005607

A classroom contains air represented by 300 equal units. About how many units represent oxygen?

(A) 21
(B) 63
(C) 78
(D) 237

Correct Answer: B

Explanation:

21% of 300 = 63.

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Question (16)

QN005608

Which statement correctly defines percentage?

(A) Number of parts in 10
(B) Number of parts in 100
(C) Number of parts in 1000
(D) Fraction without denominator

Correct Answer: B

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Question (17)

QN005609

If oxygen forms 21% of air, what percentage is not oxygen?

(A) 21%
(B) 78%
(C) 79%
(D) 99%

Correct Answer: C

Explanation:

100% - 21% = 79%.

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Question (18)

QN005610

A windmill works on a principle similar to that of a:

(A) Bicycle wheel
(B) Fan
(C) Firki
(D) Pulley

Correct Answer: C

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Question (19)

QN005611

A bottle contains 800 mL of air. Approximately how much oxygen is present in it?

(A) 168 mL
(B) 210 mL
(C) 420 mL
(D) 624 mL

Correct Answer: A

Explanation:

21% of 800 = 168 mL.

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Question (20)

QN005612

Which gas occupies about 78 out of every 100 parts of air?

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

Correct Answer: B

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Question (11)

What percentage of air is made up of argon, carbon dioxide and other gases together?

Explanation:

Link:

Question (12)

A firki rotates when a child runs while holding it because of:

Explanation:

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Question (13)

Out of 1000 litres of air, approximately how much nitrogen is present?

Explanation:

Link:

Question (14)

Which gas in air is directly used by the body during breathing?

Explanation:

Link:

Question (15)

A classroom contains air represented by 300 equal units. About how many units represent oxygen?

Explanation:

Link:

Question (16)

Which statement correctly defines percentage?

Explanation:

Link:

Question (17)

If oxygen forms 21% of air, what percentage is not oxygen?

Explanation:

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Question (18)

A windmill works on a principle similar to that of a:

Explanation:

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Question (19)

A bottle contains 800 mL of air. Approximately how much oxygen is present in it?

Explanation:

Link:

Question (20)

Which gas occupies about 78 out of every 100 parts of air?

Explanation:

Link:

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