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Environmental Engineering

Environmental Engineering
If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be

40 mm/hr
20 mm/hr
4 mm/hr
10 mm/hr

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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

1
100
Zero
Infinite

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Environmental Engineering
The depression of water table in a well due to pumping will be maximum(Where ‘R’ is the radius of influence)

None of these
At a distance R/2 from the well
At a distance R from the well
Close to the well

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Environmental Engineering
Residual chlorine in water is determined by

Starch iodide method
Orthotolidine method
Both (A) and (B)
None of these

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Environmental Engineering
The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about

0.5 to 1.0 ppm
0.05 to 0.5 ppm
1.0 to 5.0 ppm
0.01 to 0.05 ppm

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Environmental Engineering
For satisfactory working of a sludge digestion unit, the pH range of digested sludge should be maintained as

10.5 to 12.0
4.5 to 6.0
6.5 to 8.0
8.5 to 10.0

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