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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

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

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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 devices which are installed for drawing water from the sources are called

Aquiclude
Aquifers
Intakes
Filters

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Environmental Engineering
The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is

None of these
Greater than HMD when flowing full
Equal to HMD when flowing full
Less than HMD when flowing full

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Environmental Engineering
Alum as a coagulant is found to be most effective when pH range of water is

4 to 6
6 to 8
2 to 4
8 to 10

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Environmental Engineering
As compared to geometrical increase method of forecasting population, arithmetical increase method gives

Same value
Accurate value
Lesser value
Higher value

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