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Atmosphere is divided into two main vertical regions one is called hydrosphere and lower is ______:

A.	Troposphere	B.	Mezosphere
C.	Homosphere	D.	None of these

The total height of homosphere is ______ km:

A.	60-100	B.	70-100
C.	8--100	D.	90-100

Total height of atmosphere is _______ km.

A.	30,000	B.	40,000
C.	50,000	D.	60,000

The part of atmosphere which contains constant gasses with known composition called:

A.	Homosphere	B.	Thermosphere
C.	Hetrosphere	D.	None of these

Nitrogen is ______ % in the air:

A.	58	B.	68
C.	78	D.	88

Oxygen is ______ % in the air:

A.	18	B.	19
C.	20	D.	21

The part of atmosphere which is consisted on variable gasses with unknown composition is called _______:

A.	Stratosphere	B.	Hetrosphere
C.	Homosphere	D.	None of these

_______ absorbs energy which is transferred to the atmosphere from the earth's surface and maintains temperature for life:

A.	CO2	B.	O2
C.	N2O	D.	O3

Without _______ there would be no clouds or rainfall:

A.	Water Vapour	B.	CO
C.	CO2	D.	O3

10.

A layer located in stratorphere which absorbs ultraviolet rays of sun called _______:

A.	Ozone layer	B.	F-layer
C.	D-layer	D.	E-layer