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Environmental Engineering in CE

Environmental Engineering in CE
Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels.

150
120
90
180

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

Aluminium sulphate
Chloramine
Ferrous sulphate
Hydrated lime

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Environmental Engineering in CE
Which of the following is a green house gas other than COâ‚‚ ?

Chlorofluro carbons (CFC)
Nitrous oxide
All of these
Methane

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Environmental Engineering in CE
Algae growth in water is controlled by

Chlorination
Deoxidation
Bleaching
Aeration

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Environmental Engineering in CE
The length of rectangular sedimentation tank should not be more than(Where ‘B’ is the width of the tank)

2B
8B
B
4B

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

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

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