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Environmental Engineering in CE

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.

1000
100
400
4000

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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).

1.2
0.2
4.8
0.002

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Environmental Engineering in CE
Presence of iron and manganese in water causes

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

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Environmental Engineering in CE
A standard test for determination of hardness in water is termed as __________ test.

Presumptive
EDTA
Total count
Electometric

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Environmental Engineering in CE
The lowest layer of atmosphere is known as the

Ionosphere
None of these
Troposphere
Stratosphere

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Environmental Engineering in CE
Ionisation potential employed in the industrial electrostatic precipitator is of the order of

230 V DC
230 V AC
30 to 70 kV DC
30 to 70 kV AC

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