We Need Clean Air

Which of the following is NOT true regarding the properties of air?

• A) Air occupies space

• B) Air is tasteless

• C) Air has no weight

• D) Air cannot be seen

The burning of fire needs

• carbon dioxide

• nitrogen

• oxygen

• water vapor

f the following does NOT disturb the balance of gases in the air?

• Growing trees

• Cutting down trees and forests

• Releasing smoke from the vehicles

• Releasing polluting gases into the air

A gentle wind is called __________

• thunderstorm

• cyclone

• air

• breeze

What is the percentage of carbon dioxide in the air?

• 1%

• 66%

• 21%

• 78%

In air, water is present in the form of _____________

• solid

• liquid

• hailstorms

• gas

Sometimes the wind moves with great speed and it rains very heavily. This wind is called:

• Breeze

• Gale

• windstorm

• None of these

What is the composition of air?

• Nitrogen, hydrogen, and water vapor

• Nitrogen, oxygen, carbon dioxide, dust particles, and water vapor

• Nitrogen, carbon dioxide, rare gases, water vapor, and dust particles

• All of these

When we blow air into a balloon it expands. What is the reason?

• Air has weight

• Air is odourless

• Air occupies space

• Air is invisible

The composition of air, from the greatest quantity to the smallest quantity.

• nitrogen, oxygen, carbon dioxide

• oxygen, nitrogen, carbon dioxide

• carbon dioxide, nitrogen, oxygen