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Environmental Engineering in CE

Environmental Engineering in CE
Noise level during normal conversation among men is about __________ decibles.

10
90
115
45

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Environmental Engineering in CE
In large thermal power stations very fine particulates present in flue gas are removed by

Dust catcher
Electrostatic precipitators
Bag filter
Wet scrubber

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

Asphyxiation
Mathenoglobenemia
Tooth decay
Gastroentetitis

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Environmental Engineering in CE
Smog is

Nothing but black smoke
A solid particle e.g. flyash
A combination of smoke and fog
A liquid particle resulting from vapor condensation

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Environmental Engineering in CE
__________ is removed from water by lime-soda process.

Foul smell and taste
Permanent hardness
Iron and manganese
Temporary hardness

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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?

Alkyl benzene sulphonate (ABS)
Alkalis
Benzene hexachloride
Chlorine

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