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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).

4.8
1.2
0.002
0.2

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Environmental Engineering in CE
Presence of iron and manganese in water causes

None of these
Discoloration of bathroom fixtures
Reduction in its dissolved oxygen content
Temporary hardness

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Environmental Engineering in CE
Which of the following is the most lethal water pollutant?

Chlorine
Phenol and cynide
Alkalis
Suspended solids

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Environmental Engineering in CE
Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).

43961
25-30
43832
15-20

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Environmental Engineering in CE
Algae growth in water is controlled by

Chlorination
Aeration
Bleaching
Deoxidation

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

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

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