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ENVIRONMENTAL ENGINEERING IN CE

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

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

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Environmental Engineering in CE
Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream?

Mechanical flocculation
Circular clarifier
Sedimentation tank
Chemical coagulation

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Environmental Engineering in CE
__________ is removed from water by lime-soda process.

Foul smell and taste
Permanent hardness
Iron and manganese
Temporary hardness

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Environmental Engineering in CE
The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the

None of these
Stratosphere
Troposphere
Ionosphere

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Environmental Engineering in CE
A 'body' which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the

Green house
Ionosphere
Global warming
Atmospheric effect

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