We should keep our doors and windows
Closed
Partially closed
Open
None of these
We must breathe _________for health.
Clean and fresh air
Air
Clean
Dust
Air contains _________ particles.
No particles
Dust particles
Air particles
All of these
The percentage of oxygen in the air is about
10%
21%
31%
41%
___________ keep our body fit and strong .
Unclean air
Pure air
Both a and b
Smoke
Air has
Water vapour
Food
No water vapour
When air moves gently it is called
Wind
Breeze
Hurricane
Rain
A ___________ can uproot trees and, at sea it can sink ships.
Storm
Weather
Cloud
Weight
Velocity
Volume
None
________makes the air fresh and pure.
Animals
Humans
Plants
Fish
