Class6 - Air-Class test

Air is mostly made up of what two gases?

• oxygen and nitrogen
• oxygen and hydrogen
• hydrogen and helium
• nitrogen and hydrogen

How much oxygen is in the air? (%)

• 25%
• 21%
• 68%
• 50%

How much nitrogen is in the air? (%)

• 75%

• 78%

• 68%

• 60%

The name of the gaseous envelope around the Earth

• atmosphere
• hydrosphere
• biosphere

Which gas creates green house effect in the atmosphere?

• Carbon dioxide

• Ozone

• Oxygen

• None of these

As we go up to the layers of atmosphere, the pressure

• Increases

• Decreases

• Remains the same

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

• Troposphere

• Stratosphere

• Exosphere

• Mesosphere

Choose the other forms of precipitation

• Snow

• Sleet

• Hail

• Wind

Which property of Air shown in the image?

• Air has weight

• Air is needed for burning

What causes acid rain?

• High concentrations of sulphuric or nitric acid from pollution

• Fertilizer use

• Pesticide use

• CFCs