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Environmental Engineering

Environmental Engineering
If Biochemical oxygen demand (BOD) of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is

4,00,000
1,00,000
4000
1000

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Environmental Engineering
The main disadvantage of cement concrete sewers is

Difficulty in construction
Difficulty in transportation due to heavy weight
Less strength
Less life

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Environmental Engineering
For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be

2X
X
X/2
X/4

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Environmental Engineering
The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called

Anti-siphonage pipe
Soil pipe
Waste pipe
Vent pipe

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Environmental Engineering
The pathogens can be killed by

Oxidation
Nitrification
None of these
Chlorination

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Environmental Engineering
The alum, when added as a coagulant in water

Increases pH value of water
Does not require alkalinity in water for flocculation
Does not affect pH value of water
Decreases pH value of water

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