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Environmental Engineering in CE

Environmental Engineering in CE
Color test of water is done with an instrument called

Colorimeter
Tintometer
Electro-chemical cell
Turbidimeter

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Environmental Engineering in CE
TLV of ammonia, nitrogen dioxide and phenol vapor in air is __________ ppm.

1000
2000
5
100

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Environmental Engineering in CE
The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.

120
60
105
90

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Environmental Engineering in CE
__________ plant emits large amount of SO₂ as an air pollutant.

Sulphuric acid
Nitric acid
Iron & steel
Chloralkali

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Environmental Engineering in CE
Siderosis is a disease caused by the inhalation of __________ dust.

Silica
Coal
Iron
None of these

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Environmental Engineering in CE
A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.

1000 to 2000
10000 to 100000
6000 to 9000
3000 to 6000

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