The specific retention is least in case of_______________?
The specific retention is least in case of_______________?
A. Clay
B. Sand
C. Silt
D. Coarse gravel
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Acidity in water is caused due to_______________?
Acidity in water is caused due to_______________?A. Mineral acids
B. Free CO2
C. Iron sulphate
D. Aluminium sulphate
E. All the aboveBiochemical Oxygen Demand (B.O.D.) of safe drinking water must be________________?
Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be________________?A. nil
B. 5
C. 10
D. 15
E. 20Surge tanks are used_______________?
Surge tanks are used_______________?A. for storage water
B. to increase the velocity in a pipeline
C. as overflow valves
D. to guard against water hammerThe yield of a rapid gravity filter as compared to that of slow sand filter, is__________________?
The yield of a rapid gravity filter as compared to that of slow sand filter, is__________________?A. 10 times
B. 15 times
C. 20 times
D. 30 times
E. 35 timesAverage annual rainfall at any station is the average of annual rainfall over a period of________________?
Average annual rainfall at any station is the average of annual rainfall over a period of________________?A. 7 years
B. 14 years
C. 21 years
D. 28 years
E. 35 yearsThe least thickness of class B cast iron (spun) pipe, is_________________?
The least thickness of class B cast iron (spun) pipe, is_________________?A. 7.2 mm
B. 7.9 mm
C. 8.6 mm
D. 10 mm