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Environmental Engineering in CE

Environmental Engineering in CE
__________ substances present in sewage are removed in grit chamber during sewage treatment.

Fatty
Inorganic
Dissolved
Organic

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Environmental Engineering in CE
Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes

Gastritis & diarrhea
Paralysis of muscles & loss of appetite
All of these
Nervous depression

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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?

Chlorination
Skimming off
Biological oxidation
Sedimentation

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Environmental Engineering in CE
Ozone is

A secondary pollutant
A primary pollutant
Both B & C
Impervious to ultra-violet rays

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Environmental Engineering in CE
Sulphur dioxide present in the industrial chimney exhaust gases causes

All of these
Reduction in plant's productivity owing to acid rain
Respiratory & lung disease
Corrosion of building materials

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Environmental Engineering in CE
Noise level in a quiet private business office is about __________ decibels.

25
50
70
85

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