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11.

The greatest concentration of ozone is found at ______ km:

A.	10	B.	20
C.	30	D.	None of these

12.

The pause between troposphere and stratosphere is called ________ :

A.	Tropo pause	B.	Strato pause
C.	Mezzo pause	D.	None of these

13.

The pause between stratosphere and thermosphere is called _______ :

A.	Thermopause	B.	Stratopause
C.	Both (a) & (b)	D.	None of these

14.

"CFC" is continuously destroying the ____ layer:

A.	D-layer	B.	F-layer
C.	Ozone layer	D.	None of these

15.

A layer of Ions inside the mesosphere is called _______ :

A.	F-layer	B.	D-layer
C.	Ozone layer	D.	Both (b) & (c)

16.

There is cut off signal when NASA rocket reaches in the region of ______ :

A.	D-layer	B.	Stratosphere
C.	Ozone layer	D.	Mesosphere

17.

Two ionic layers are present in:

A.	Troposphere	B.	Mesosphere
C.	Hetrosphere	D.	Thermosphere

18.

The limit of clouds is up to _______ :

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

19.

The lapse rate in Troposphere is:

A.	6.5C/1000 m	B.	7.5C/1000 m
C.	8.5C/1000 m	D.	9.5C/1000 m

20.

Temperature of atmosphere decreases in _______ :

A.	Stratosphere	B.	Troposphere
C.	Mesosphere	D.	Both (b) & (c)