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Environmental Engineering in CE

Environmental Engineering in CE
Fluorosis is caused due to the presence of excessive amount of __________ in drinking water.

Arsenic
Fluoride
Mercury
Lead

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Environmental Engineering in CE
The concentration of water vapour in troposphere, which depends upon the altitude & temperature varies in the range of zero to __________ percent.

12
8
4
1

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Environmental Engineering in CE
Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of __________ present in it.

Coal ash
Potassium cyanide
Ortho-xylene
None of these

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Environmental Engineering in CE
Fine grit present in sewage is removed in the __________ during sewage treatment.

Detritus tank
Skimming tank
Grit chamber
Trickling filter

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

1.2
0.002
0.2
4.8

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Environmental Engineering in CE
Carbonaceous particles having size less than 1 μm are called

Grit
Aerosols
Aggregates
Smoke

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