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Environmental Engineering in CE

Environmental Engineering in CE
The term Biological Oxygen Demand (BOD) is used in relation to

Distilled water
Industrial effluents
Potable water
Cooling water

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Environmental Engineering in CE
In a sedimentation tank, the detention period for water ranges from __________ hours.

2 to 4
16 to 20
8 to 12
24 to 32

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Environmental Engineering in CE
Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas?

Acetylene
Carbon monoxide
Hydrogen
Ammonia

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Environmental Engineering in CE
Which of the following is the most severe air pollutant?

Hydrocarbons
NOx
CO
SO₂

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Environmental Engineering in CE
The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant?

Chlorine
Benzene hexachloride
Alkyl benzene sulphonate (ABS)
Alkalis

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Environmental Engineering in CE
Maximum permissible limit of mercury in human blood is __________ micrograms/100 c.c.

82
7
19
1

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