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Environmental Engineering in CE

Environmental Engineering in CE
In water treatment, alum[Al2(SO₄)3] is used for the process of

Coagulation
Filtration
Disinfection
Sedimentation

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Environmental Engineering in CE
Hazardous/polluting chemical industries should have an 'exclusion zone' with a green belt and general public access prohibited around it, covering a radius of ____ metres.

4000
1000
400
100

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Environmental Engineering in CE
Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).

0.2
4.8
0.002
1.2

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Environmental Engineering in CE
Growth of __________ is promoted by the presence of manganese in water.

Mosquitoes
Micro-organisms
Algae
Files

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

Iron and manganese
Temporary hardness
Permanent hardness
Foul smell and taste

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Environmental Engineering in CE
Which of the following is a green house gas other than CO₂ ?

Methane
Chlorofluro carbons (CFC)
Nitrous oxide
All of these

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