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Environmental Engineering in CE

Environmental Engineering in CE
Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).

0.2
0.002
1.2
4.8

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Environmental Engineering in CE
A masonry structure built below ground level, where biochemical reaction takes place due to anaerobic bacteria is called

Skimming mill
Lagoon
Septic tank
Cesspool

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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

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

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Environmental Engineering in CE
Aerosols present in atmospheric air may be

Neutral
Negatively charged
Combination of all A, B & C
Positively charged

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Environmental Engineering in CE
Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels.

180
120
90
150

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

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

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