Default Title

Question (21)

QN005613

If a hall contains 10,000 litres of air, approximately how much of it is oxygen?

(A) 100 litres
(B) 7800 litres
(C) 2100 litres
(D) 7900 litres

Correct Answer: C

Explanation:

21% of 10,000 = 2100 litres.

Link:

Report Error

Question (22)

QN005614

Which of the following is an example of gentle moving air?

(A) Breeze
(B) Tornado
(C) Cyclone
(D) Hurricane

Correct Answer: A

Explanation:

Link:

Report Error

Question (23)

QN005615

If oxygen is removed from air, which life process would be most immediately affected in humans?

(A) Digestion
(B) Breathing
(C) Growth of hair
(D) Hearing

Correct Answer: B

Explanation:

Link:

Report Error

Question (24)

QN005616

Out of 400 equal squares representing air, how many squares would represent nitrogen?

(A) 78
(B) 156
(C) 312
(D) 322

Correct Answer: C

Explanation:

78% of 400 = 312.

Link:

Report Error

Question (25)

QN005617

Which pair correctly matches a gas with its approximate percentage in air?

(A) Oxygen – 78%
(B) Nitrogen – 21%
(C) Nitrogen – 78%
(D) Argon – 21%

Correct Answer: C

Explanation:

Link:

Report Error

Question (26)

QN005618

A child blows air on a firki and it starts rotating. This demonstrates that air can:

(A) Produce sound only
(B) Occupy space only
(C) Exert an effect through motion
(D) Dissolve in water only

Correct Answer: C

Explanation:

Link:

Report Error

Question (27)

QN005619

In 50 equal parts of air, approximately how many parts are oxygen?

(A) 5.5
(B) 10.5
(C) 15.5
(D) 21

Correct Answer: B

Explanation:

21% of 50 = 10.5.

Link:

Report Error

Question (28)

QN005620

Why can humans survive without food for a few days but not without oxygen for a few minutes?

(A) Oxygen is needed continuously for body functions
(B) Oxygen is stored permanently in the body
(C) Food contains oxygen
(D) Oxygen is heavier than air

Correct Answer: A

Explanation:

Link:

Report Error

Question (29)

QN005621

Which activity from the chapter helps us experience the importance of air directly?

(A) Growing plants
(B) Holding the breath for some time
(C) Collecting soil samples
(D) Harvesting rainwater

Correct Answer: B

Explanation:

Link:

Report Error

Question (30)

QN005622

A tank contains 250 litres of air. About how many litres are made up of gases other than nitrogen and oxygen?

(A) 2.5 litres
(B) 25 litres
(C) 21 litres
(D) 78 litres

Correct Answer: A

Explanation:

Other gases = 1% of air; 1% of 250 = 2.5 litres.

Link:

Report Error

Question (21)

If a hall contains 10,000 litres of air, approximately how much of it is oxygen?

Explanation:

Link:

Question (22)

Which of the following is an example of gentle moving air?

Explanation:

Link:

Question (23)

If oxygen is removed from air, which life process would be most immediately affected in humans?

Explanation:

Link:

Question (24)

Out of 400 equal squares representing air, how many squares would represent nitrogen?

Explanation:

Link:

Question (25)

Which pair correctly matches a gas with its approximate percentage in air?

Explanation:

Link:

Question (26)

A child blows air on a firki and it starts rotating. This demonstrates that air can:

Explanation:

Link:

Question (27)

In 50 equal parts of air, approximately how many parts are oxygen?

Explanation:

Link:

Question (28)

Why can humans survive without food for a few days but not without oxygen for a few minutes?

Explanation:

Link:

Question (29)

Which activity from the chapter helps us experience the importance of air directly?

Explanation:

Link:

Question (30)

A tank contains 250 litres of air. About how many litres are made up of gases other than nitrogen and oxygen?

Explanation:

Link:

Excel With Tutors

ExcelWithTutors

For Student

For Tutors

Learn

OUR POLICY