SCIENCE GRADE 4

The invisible blanket of air is called

• Air

• Clouds

• Atmosphere

What is the percentage of nitrogen in the air?

• 78

• 77

• 79

Oxygen is very essential for _________

• Living things

• Non living things

• both

__________ is used to make fertilizers.

• Carbondioxide

• Oxygen

• Nitrogen

What is the percentage of the oxygen?

• 22

• 21

• 20

___________ gas is needed for all the plants for photosynthesis.

• Oxygen

• Carbondioxide

• Nitrogen

Which gas is used to produce colourful glow in glass tubes.

• Argon

• Neon

• Helium

What is the percentage of other gases?

• 1

• 2

• 3

___________ will trap the sun's heat from the atmosphere.

• Carbondioxide

• Oxygen

• Neon

Which of the following is the properties of air?

• it has weight

• it occupies space

• both