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Environmental Engineering in CE

Environmental Engineering in CE
Most of the bacteria in sewage are

None of these
Saprophytic
Anerobic
Parasitic

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Environmental Engineering in CE
Which of the following is a green house gas other than CO₂ ?

All of these
Nitrous oxide
Methane
Chlorofluro carbons (CFC)

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Environmental Engineering in CE
Lagooning process is mainly a means of the

Biological treatment of wastes
Sludge disposal
Reduction of excessive flow in sewers
None of these

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Environmental Engineering in CE
Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal

By chemical coagulation
In clarifiers
In sedimentation tanks equipped with mechanical scrapper
In vacuum filter

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Environmental Engineering in CE
Which is a secondary air pollutant?

Photochemical smog
Dust particles
Nitrogen dioxide
Sulphur dioxide

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

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

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