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Environmental Engineering in CE

Environmental Engineering in CE
Aerosols present in atmospheric air may be

Negatively charged
Positively charged
Neutral
Combination of all A, B & C

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Environmental Engineering in CE
The biological decomposition of organic substances in wastes controlled conditions is called

Biological oxidation
None of these
Incineration
Composting

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Environmental Engineering in CE
The progressive warming up of the earth's surface is mainly due to the

De-forestation
Blanketing effect of CO₂ in the atmosphere
Automobile exhaust
Thickening of ozone layer

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Environmental Engineering in CE
The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of __________ of water.

Biological oxygen demand
All of these
Vapor pressure
Dissolved oxygen content

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

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Environmental Engineering in CE
Maximum permissible turbidity in potable water is __________ ppm.

250
1000
1
10

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