1.
Option D
2.
When the wind moves and we enjoy it, it is called as the breeze.
3.
Option B
4.
We use air pressure in a medicine dropper, fountain pen, injection, straws etc.
5.
Air exerts a pressure of 1 kg per square centimeter.
6.
Option A
7.
Moving air is called as the wind.
8.
Option C
9.
Tree make the air fresh and clean.
10.
Option B
11.
Option B
12.
Air blows around us.
13.
The air in footballs and basketballs helps them to bounce.
14.
Option B
15.
Option A
16.
Non-moving air is called as air.
17.
Option A
18.
Air is used in tires and flying kites.
19.
Option D
20.
We can see dust only when sun's rays enter the room.
