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Environmental Engineering in CE

Environmental Engineering in CE
Which is a secondary air pollutant?

Sulphur dioxide
Nitrogen dioxide
Photochemical smog
Dust particles

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Environmental Engineering in CE
Salt content in sea water is about __________ percent.

0.5
1
10
3.5

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Environmental Engineering in CE
Pick out the one which is not a chemical coagulant.

Aluminium sulphate
Hydrated lime
Ferrous sulphate
Chloramine

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Environmental Engineering in CE
Septic tank is a(i) Settling tank(ii) Digestion tank(iii) Aeration tank

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

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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.

5
2000
1000
500

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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

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

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