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Environmental Engineering in CE

Environmental Engineering in CE
The commonest form of iron & manganese found in ground water as pollutant is in the form of their

Bi-carbonates
Carbonates
Chlorides
Sulphides

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Environmental Engineering in CE
Which is the most practical and economical method for removal of suspended solid matter from polluted water?

Chlorination
Biological oxidation
Sedimentation
Skimming off

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Environmental Engineering in CE
Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants?

F
NOx
SO₂
Hg

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Environmental Engineering in CE
Which of the following industries discharge mercury as a pollutant?

Chloro-alkali industry
Phosphoric acid plant
Beverage plant
Tanneries

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Environmental Engineering in CE
Threshold Limit Value (TLV) is the maximum allowable concentration (i.e. safe limit) of pollutants in air. Safe limit for SO₂ in air is __________ ppm.

500
1000
2000
5

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Environmental Engineering in CE
The disinfection efficiency of chlorine increases by(i) Decreasing the time of contact(ii) Decreasing the temperature of water(iii) Increasing the temperature of water

Only (iii)
Both (i) and (iii)
Both (i) and (ii)
Only (i)

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