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Environmental Engineering in CE

Environmental Engineering in CE
The Killer gas which caused Bhopal gas tragedy in 1984 was

Phosgene
Sulphur dioxide
Methyl iso-cynate (MIC)
Carbon monoxide

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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
Sedimentation tank
Chemical coagulation
Circular clarifier

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Environmental Engineering in CE
Noise pollution level in a chemical plant is expressed in

Roentgen
Decibel
None of these
Hertz

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Environmental Engineering in CE
Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes

Depletion of dissolved oxygen
Explosion hazards
Fire hazards
Persistent foam

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Environmental Engineering in CE
Water effluent generated in printing industry is decolourised by

Adsorption
Electrolytic decomposition
Ion exchange technique
Reverse osmosis

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Environmental Engineering in CE
Which of the following plants does not emit appreciable amount of SO₂ in atmosphere?

Nitric acid plant
Sulphuric acid plant
Thermal power plant
Petroleum refinery

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