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Environmental Engineering in CE

Environmental Engineering in CE
Which is the most widely used coagulant for the treatment of turbid water?

Lime
Alum (aluminium sulphate)
Ferric chloride
Sodium aluminate

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Environmental Engineering in CE
The biological decomposition of organic substances in wastes controlled conditions is called

None of these
Incineration
Composting
Biological oxidation

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Environmental Engineering in CE
The permissible color for domestic water supply is __________ ppm.

100
20
1000
1

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Environmental Engineering in CE
Sulphur dioxide present in the industrial chimney exhaust gases causes

All of these
Respiratory & lung disease
Corrosion of building materials
Reduction in plant's productivity owing to acid rain

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Environmental Engineering in CE
Smog is

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

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Environmental Engineering in CE
Dose of chlorine for disinfection of water is about __________ mg/litre of water.

0.1
0.3
1
0.01

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