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Waste Water Engineering

Waste Water Engineering
The water carried sewerage system removes

Industrial sewage
Domestic sewage
Storm sewage
All listed here

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Waste Water Engineering
If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is

250 mg/l
150 mg/l
50 mg/l
100 mg/l

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Waste Water Engineering
Sewer pipes need be checked for

Minimum flow
Both A and B
Maximum flow
None of these

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Waste Water Engineering
As compared to fresh river water, sea water contains oxygen

20% more
20% less
10% less
10% more

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Waste Water Engineering
Which one of the following part of human body withstands minimum radiation?

Kidneys
Eyes
Thyroid
Ovaries/testis

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Waste Water Engineering
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter

Less than 0.01 mm
Less than 0.1 mm
Less than 0.05 mm
Greater than 0.1 mm

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