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

A)
recovery
B)
degradation
C)
cleaner water
D)
active decomposition

Correct Answer :   active decomposition

Recently Updated in Waste Water Engineering Questions
What is the growth of huge amounts of algae and other aquatic plants leading to the deterioration of the water quality called?
A)
Algae growth
B)
Eutrophication
C)
Denitrification
D)
Nitrification

Correct Answer : Option (B) :   Eutrophication

Explanation : Eutrophication is the growth of huge amounts of algae and other aquatic plants leading to the deterioration of water quality. The untreated wastewater is rich in organic matter which demands oxygen.

5 days-biochemical oxygen demand (BOD₅) is taken at a temperature of
A)
0°C
B)
15°C
C)
20°C
D)
25°C

Correct Answer : Option (C) :   20°C

Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for
A)
unexpected increase in the population
B)
under estimates of maximum and average flows
C)
unexpected large scale infiltration of stream water
D)
All of the above

Correct Answer : Option (D) :   All of the above

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