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Environmental Engineering in CE

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

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

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Environmental Engineering in CE
The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the

Relative stability
Oxygen ion concentration
Bacterial stability factor
Biological oxygen demand (BOD)

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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.

None of these
Ortho-xylene
Potassium cyanide
Coal ash

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Environmental Engineering in CE
Noise level inside a jet air liner in normal flight is about __________ decibels.

145
80
100
125

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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.

4
12
1
8

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Environmental Engineering in CE
The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the

Global warming
Green house effect
Catalytic conversion
Both B and C

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