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Environmental Engineering

Environmental Engineering
Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about

75
50
59
100

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Environmental Engineering
The rate of filtration in slow sand filters in million litres per day per hectare is about

100 to 150
50 to 60
500 to 600
1400 to 1500

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Environmental Engineering
Which of the following compounds is widely used for algae control?

Calcium chloride
Copper sulphate
Sodium sulphate
Sodium chloride

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Environmental Engineering
The type of sewer which is suitable for both combined and separate system is

Circular sewer
Horseshoe type sewer
Semi-elliptical sewer
Egg shaped sewer

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Environmental Engineering
The rate of BOD exerted at any time is

Inversely proportional to BOD satisfied
Directly proportional to BOD satisfied
Directly proportional to BOD remaining
Inversely proportional to BOD remaining

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Environmental Engineering
Disinfection efficiency is

Reduced at higher pH value of water
Increased at higher pH value of water
Unaffected by pH value of water
Highest at pH value equal to 7

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