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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
1000
4000
1,00,000

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Environmental Engineering
The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is

100
1
Infinite
Zero

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Environmental Engineering
The process in which the chlorination is done beyond the break point is known as

Pre-chlorination
Post chlorination
Break point chlorination
Super chlorination

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Environmental Engineering
For normal sludge, the value of sludge index for Indian conditions is

50 to 150
350 to 500
150 to 350
0 to 50

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Environmental Engineering
The suitable method of forecasting population for a young and rapidly increasing city is

Graphical method
Incremental increase method
Geometrical increase method
Arithmetical increase method

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

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

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