Environmental Engineering

1

Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate ?

A. CO
B. SO2
C. NOx
D. CFC (chloro fluoro carbons)

2

Hydrogen ion concentration in distilled water is

A. 10-7
B. 7x10-7
C. 107
D. 7x107

3

Green house gases blanket/block the infrared radiation from earth's surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect ?

A. CO2
B. H2
C. SO3
D. N2

4

CFC (chloro fluoro carbon) is very highly reactive in causing depletion of ozone layer in the atmosphere. Each atom of chlorine liberated from CFC is capable of decomposing __________ molecules of ozones.

A. 102
B. 105
C. 109
D. 1015

5

The main type of sludge gas evolved during sewage treatment in Imhoff tank is

A. CO2
B. CH4
C. CO
D. H2