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Environmental Engineering in CE

Environmental Engineering in CE
The pH value of oxidised sewage is about

7.3
1.8
13.4
6.2

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Environmental Engineering in CE
Which of the following is the most widely used disinfectant in water treatment?

Cation exchanger
Coagulation
Chlorine
Irradiation of water by ultraviolet light

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Environmental Engineering in CE
Tolerable limit of nitrogen oxides in air is __________ ppm.

1
5
0.1
25

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Environmental Engineering in CE
Foul odour and bad taste of water is removed by treating with

Copper sulphate
Alum
Activated carbon
Bleaching powder

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Environmental Engineering in CE
The lowest layer of atmosphere is known as the

None of these
Troposphere
Ionosphere
Stratosphere

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

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

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