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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_________________?

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_________________?

A. 50 mg/l
B. 100 mg/l
C. 150 mg/l
D. 250 mg/l

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_________________? Read More »

Civil Engineering Mcqs, Waste Water Engineering

In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is_____________________?

In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is_____________________?

A. 5
B. 10
C. 15
D. 20

In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is_____________________? Read More »

Civil Engineering Mcqs, Waste Water Engineering

If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of__________________?

If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of__________________?

A. Degradation
B. Active decomposition
C. Recovery
D. Cleaner water

If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of__________________? Read More »

Civil Engineering Mcqs, Waste Water Engineering