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Environmental Engineering in CE

Environmental Engineering in CE
Death may occur, when SO₂ concentration in atmospheric air exceeds __________ ppm.

400
100
200
20

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Environmental Engineering in CE
Which of the following is the most major constituents of air pollutants?

Oxides of nitrogen
Hydrogen sulphide
Carbon monoxide
Oxides of sulphur

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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

Lagoon
Septic tank
Skimming mill
Cesspool

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Environmental Engineering in CE
The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU).

1500
230
20
750

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Environmental Engineering in CE
Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.

35
105
95
75

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Environmental Engineering in CE
Radioactive solid nuclear wastes are disposed off by

High temperature incineration
Underground burial in concrete containers
Pyrolysis
Pathological incineration

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