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Environmental Engineering in CE

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

None of these
Biological oxidation
Incineration
Composting

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Environmental Engineering in CE
Infective bacteria in water is killed by the __________ process.

None of these
Sterilisation
Disinfection
Aeration

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Environmental Engineering in CE
Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes

Nervous depression
All of these
Paralysis of muscles & loss of appetite
Gastritis & diarrhea

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Environmental Engineering in CE
High noise level in a chemical plant can be controlled by the

Path control of noise
Protection of operating personnel
All of these
Suppression of noise at the source itself

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Environmental Engineering in CE
Siderosis is a disease caused by the inhalation of __________ dust.

Iron
Coal
None of these
Silica

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Environmental Engineering in CE
Oil and grease present in an emulsified state in waste water discharged from industries can be removed by

Settling out using chemical reagents
Chlorination
Biological oxidation
Skimming off

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