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Environmental Engineering in CE

Environmental Engineering in CE
A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.

3000 to 6000
10000 to 100000
6000 to 9000
1000 to 2000

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Environmental Engineering in CE
Presence of __________ bacteria in water causes disease like typhoid.

Anaerobic
Aerobic
Non-pathogenic
Pathogenic

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Environmental Engineering in CE
Which of the following is not a weightless pollutant?

Noise pollution
SPM
Radioactive rays
Thermal pollution

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Environmental Engineering in CE
As compared to rapid sand filters, slow sand filters give
(i) Slower filtration rate
(ii) Higher filtration rate
(iii) Lesser efficiency in removal of bacteria
(iv) Higher efficiency in removal of bacteria
The correct answer is

(i) and (iv)
(ii) and (iv)
(ii) and (iii)
(i) and (ii)

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Environmental Engineering in CE
In a sedimentation tank, the detention period for water ranges from __________ hours.

8 to 12
2 to 4
16 to 20
24 to 32

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Environmental Engineering in CE
Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly __________ substances.

Radioactive
Inorganic
None of these
Organic

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