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Environmental Engineering in CE

Environmental Engineering in CE
Fresh domestic sewage is __________ in color.

Red
Dark brown
Black
Grey

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Environmental Engineering in CE
Which of the following pollutants is not emitted during volcanic eruptions?

Hydrocarbons
H₂S
CO
SO₂

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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?

Ammonia
Hydrogen
Acetylene
Carbon monoxide

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Environmental Engineering in CE
Presence of nitrates in water in excess of 50 ppm causes

Tooth decay
Asphyxiation
Gastroentetitis
Mathenoglobenemia

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Environmental Engineering in CE
The disinfection efficiency of chlorine increases by(i) Decreasing the time of contact(ii) Decreasing the temperature of water(iii) Increasing the temperature of water

Only (i)
Both (i) and (ii)
Only (iii)
Both (i) and (iii)

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Environmental Engineering in CE
In the context of the chemical process industries, the term BOD is normally associated with the

Organic concentration in gaseous effluents
Characterisation of liquid effluents
Characterisation of boiler feed water
Characterisation of solid wastes

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