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Environmental Engineering in CE

Environmental Engineering in CE
Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.

Hydrocarbons
Hydrogen flouride
Hydrogen sulphides
Nitrogen dioxide

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Environmental Engineering in CE
__________ is the process of killing organism in water.

Coagulation
Disinfection
Sterilisation
Sedimentation

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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

Chlorination
Skimming off
Biological oxidation
Settling out using chemical reagents

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Environmental Engineering in CE
The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is

Fluctuation in liquid flow
Cavitation
Boundary layer separation
Pipe vibrations

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Environmental Engineering in CE
Salt content in sea water is about __________ percent.

0.5
10
1
3.5

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Environmental Engineering in CE
A considerable part of the harmful ultraviolet radiation of the sum does not reach the earth surface, because of the fact that, there is a layer of __________ high above earth's atmosphere, which absorbs it.

None of these
Hydrogen
Carbon dioxide
Ozone

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