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Environmental Engineering in CE

Environmental Engineering in CE
The term Biological Oxygen Demand (BOD) is used in relation to

Industrial effluents
Cooling water
Potable water
Distilled water

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Environmental Engineering in CE
The main industrial source of emission of hydrogen sulphide air pollutant is

Petroleum refineries
Coal based thermal power plants
Metallurgical roasting & smelting plant
Pulp and paper plant

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Environmental Engineering in CE
The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the

Bacterial stability factor
Relative stability
Biological oxygen demand (BOD)
Oxygen ion concentration

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Environmental Engineering in CE
The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.

105
120
90
60

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Environmental Engineering in CE
80% less than 200 mesh size particles are called

Aggregates
Grit
Smoke
Powder

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Environmental Engineering in CE
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?

CFC (chloro fluoro carbons)
SO₂
CO
NOx

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