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Environmental Engineering in CE

Environmental Engineering in CE
Septic tank is a(i) Settling tank(ii) Digestion tank(iii) Aeration tank

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

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Environmental Engineering in CE
Smog is

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

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Environmental Engineering in CE
Aerosols present in atmospheric air may be

Combination of all A, B & C
Positively charged
Negatively charged
Neutral

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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
Presence of iron and manganese in water causes

Discoloration of bathroom fixtures
None of these
Temporary hardness
Reduction in its dissolved oxygen content

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Environmental Engineering in CE
Acute danger to human life (i.e. death) exists, if the concentration of CO₂ in atmospheric air exceeds __________ percent (by volume).

7
3
20
1

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