CLASS 7 GEOGRAPHY (AIR)

How much is the percentage of Nitrogen in air? 

• 0.03 %
• 78 % 
• 21 %
• trace

How much is the percentage of CO₂ in air ? 

• 21
• 0.03

Does air contains water vapour ?

• Yes 
• No

How much oxygen present in air .

• 21

• 82

• 32

• 12

Stratosphere contains a layer of which gas?

• Nitrogen

• Ozone

• Oxygen

• Carbon

Which gases make the bulk of the atmosphere?

• Nitrogen

• Oxygen

• Both a and b

• None of these

Which gas creates green house effect in the atmosphere?

• Carbon dioxide

• Ozone

• Oxygen

• None of these

Which of the following layers of atmosphere is free from clouds?

• Troposphere

• Stratosphere

• Exosphere

• Mesosphere

When precipitation comes down to the earth in the liquid form,it is called as

• Cloud

• Snow

• Rain

• Fog

The large part of the air is covered by ___________.

• Nitrogen

• Oxygen