What percentage of air consist of oxygen?
78%
88%
98%
21%
Some trees lose their leaves in:
Winter
Spring
Autumn
Which of the following comes just before winter?
Which of the following has no colour?
Water
Soil
Air
Which type of clothes do we wear in summer?
Nylon
Light cotton
Silk
Linen
The flame of a candle goes of when covered with a glass because :
There is no light.
The air does not reach the flame.
The air get trapped inside the glass.
There is no space inside the glass.
When do people go out for walks?
Afternoon
Morning
Night
The mixture of gases that makes up the Earth's atmosphere is called :
Water vapour
Nitrogen
Hydrogen
How is wind produced?
When Sun rays are blocked by the clouds.
When cool air rises up.
When water vapor in the air rises up.
When hot air rises up.
When we drop a small stone in a mug of water, thin tiny bubbles of air comes from the:
Mug
Stone
Both a and b
