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Environmental Engineering in CE

Environmental Engineering in CE
There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant?

Lead
Aluminium
Mercury
Arsenic

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Environmental Engineering in CE
80% less than 200 mesh size particles are called

Smoke
Aggregates
Grit
Powder

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Environmental Engineering in CE
Fine grit present in sewage is removed in the __________ during sewage treatment.

Grit chamber
Trickling filter
Skimming tank
Detritus tank

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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

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

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Environmental Engineering in CE
For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm.

500
1000
5
10000

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Environmental Engineering in CE
__________ plant emits large amount of SO₂ as an air pollutant.

Iron & steel
Chloralkali
Nitric acid
Sulphuric acid

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