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Environmental Engineering

Environmental Engineering
The phenolic compounds in public water supply should not be more than

0.001 ppm
0.0001 ppm
0.01 ppm
0.1 ppm

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Environmental Engineering
Alkalinity in water is expressed as milligrams per litre in terms of equivalent

Magnesium carbonate
Sodium carbonate
Calcium hydroxide
Calcium carbonate

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Environmental Engineering
Which of the following chemical compounds can be used for de-chlorination of water?

Sulphur dioxide
Carbon dioxide
Chloramines
Bleaching powder

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Environmental Engineering
The percentage of filtered water, which is used for backwashing in rapid sand filters, is about

5 to 7
0.2 to 0.4
0.4 to 1.0
2 to 4

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Environmental Engineering
The slope of sewer shall be

Steeper than 1 in 20
Given in the direction opposite to natural slope of ground
Given in the direction of natural slope of ground
Zero

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Environmental Engineering
The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by

BOD > COD > TOD
TOD > COD > BOD
COD > BOD > TOD
TOD > BOD > COD

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