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81.

Which of the following air pollutant is carcinogenic?

A.	Ethylene	B.	3.4 Benzpyrene
C.	N2O	D.	PAN

82.

The pollutants like phenol, Na and Hg can be removed from water by technique/s such as:

A.	Reverse osmosis	B.	Electrodialysis
C.	Both (a) & (b)	D.	None of these

83.

The CFC pollution sources include:

A.	Jet air crafts only	B.	Fire extinguishers and jet air crafts
C.	Refrigerators and jet air crafts	D.	All of these

84.

The lowest temperature in the atmosphere is recorded at:

A.	Mesopause	B.	Tropopause
C.	Stratopause	D.	All of these

85.

Atmospheric pollution is also caused by the gas:

A.	Phosphene	B.	Nitrogen
C.	Hydrogen	D.	Nerve gas VX

86.

The photochemical smog is also called:

A.	Los Angeles type smog	B.	New York type smog
C.	Tokyo type smog	D.	California type smog

87.

What immediate hazard is likely to occur if the temperature of the earth rises by 5?C?

A.	Melting of polar ice	B.	Destruction of phytophanktons
C.	Inundation of coastal towns	D.	Increase in productivity

88.

The classical smog mainly contains:

A.	Hydrocarbons only	B.	Hydrocarbons and SO2
C.	Hydrocarbons and N2O	D.	Particulate matter and SO2

89.

The automobile emission can be reduced by adding the following in the petrol:

A.	Calcium salts	B.	Cobalt salts
C.	Silicon oil	D.	Barium salts

90.

The photochemical smog appears:

A.	In the mid day	B.	At night
C.	In early morning	D.	At evening