______ is the most important gas for the survival of living organisms.

(a)

Helium

(b)

carbon-di-oxide

(c)

oxygen

(d)

oxygen

The ________  is the chief energy source of the Earth.

(a)

Sun

(b)

Moon

(c)

Stars

(d)

Clouds.

_____  clouds are called 'Sheep clouds'

(a)

Alto-cumulus

(b)

Alto-Stratus

(c)

Nimbo - stratus

(d)

Cirro-stratus

The upper most layer of the atmosphere is ___________

(a)

Statrosphere

(b)

Mesosphere

(c)

Exosphere

(d)

Thermosphere

This precipitation is a mixture of snow and rain

(a)

Sleet

(b)

Snow

(c)

Hail

(d)

Hailstones

Anemometer

(1)

direction of wind

Wind Vane

(2)

wind speed

Leeward side

(3)

rain shadow region

Oxygen

(4)

21%

Nitrogen

(5)

78%