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Waste Water Engineering

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

Eyes
Ovaries/testis
Kidneys
Thyroid

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Waste Water Engineering
To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of

Citric acid
Hydrochloric acid
Nitric acid
Sulphuric acid

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Waste Water Engineering
For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed

3 ppm
5 ppm
10 ppm
4 ppm

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Waste Water Engineering
¾th or ¼th extra space is left in sewer pipes at maximum discharge for

All listed here
Unexpected increase in population
Large scale infiltration of storm water
Low estimates of the average and maximum flows

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Waste Water Engineering
The sewage treatment units in which anaerobic decomposition of organic matter is used, are called

Sludge sedimentation tanks
Imhoff tanks
None of these
Trickling filters

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Waste Water Engineering
The suitable cross-section of sewers to carry combined flow, is

Circular
Rectangular
Horse shoe shaped
Egg shaped

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