Integrated Science

Question 1

1In the experiment where 100 cm³ of air passes over heated copper until no further change, the volume remaining is about

Hard

A. 21 cm³ B. 79 cm³ C. 50 cm³ D. 100 cm³

Question 2

2Which gas in air is used by plants for photosynthesis?

Easy

A. oxygen B. carbon dioxide C. argon D. nitrogen

Question 3

3About what percentage of air is oxygen?

Easy

A. 0.04% B. 21% C. 78% D. 1%

Question 4

4Limewater turns milky when it reacts with

Easy

A. oxygen B. water vapour C. nitrogen D. carbon dioxide

Question 5

5Which gas makes up about 78% of the air?

Easy

A. oxygen B. carbon dioxide C. argon D. nitrogen

Question 6

6The noble gas present in air in the largest amount is

Easy

A. neon B. krypton C. argon D. helium

Question 7

7The most abundant gas in air is

Easy

A. nitrogen B. oxygen C. carbon dioxide D. argon

Question 8

8The percentage of carbon dioxide in air is about

Easy

A. 21% B. 0.04% C. 78% D. 1%

Question 9

9When air is passed over heated copper, the copper turns black because it reacts with

Hard

A. carbon dioxide B. nitrogen C. oxygen D. argon

Question 10

10Oxygen in air is needed for

Easy

A. rusting prevention B. freezing C. burning and respiration D. photosynthesis only