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Waste Water Engineering

Waste Water Engineering
A rainfall may be classified as acidic if its pH value is less or equal to

7
6
6.5
5

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Waste Water Engineering
Imhoff cone is used to measure

Total solids
Settleable solids
Total in organic solids
Total organic solids

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Waste Water Engineering
The standard B.O.D. of water is taken for

5 days
2 days
1 day
3 days

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Waste Water Engineering
If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of

Active decomposition
Degradation
Cleaner water
Recovery

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Waste Water Engineering
For detecting the nitrites in the sewage, the matching colour may be developed by adding

None of these
Phenol-di -sulphuric acid potassium hydroxide
Sulphuric acid and napthamine
Potassium permanganate

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Waste Water Engineering
The gradient of sewers depends upon

Diameter of the sewer
All listed here
Discharge
Velocity of flow

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