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Environmental Engineering in CE

Environmental Engineering in CE
Arsenic pollutant is not generated in____industries.

Beverages
Tanneries
Glass & ceramic
Any of these

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Environmental Engineering in CE
What are the methods of treatment & disposal of radioactive wastes?

Evaporation & chemical precipitation
Fixing into a solid mass with cement and sinking deep in the sea
All of these
Biological methods & adsorption in ion exchange materials

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Environmental Engineering in CE
5-200 μm size particles are called

Smoke
Powder
Dust
Colloids or aerosols

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

Hydrogen sulphides
Nitrogen dioxide
Hydrogen flouride
Hydrocarbons

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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)
CO
SO₂
NOx

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Environmental Engineering in CE
Which is the most practical and economical method for removal of suspended solid matter from polluted water?

Skimming off
Sedimentation
Biological oxidation
Chlorination

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