Biochemical 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. 20
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The factor affecting per capita demand, is___________________?
The factor affecting per capita demand, is___________________?A. size of the city
B. climatic conditions
C. pressure in water mains
D. cost of water
E. all the aboveThe maximum depth of sedimentation tanks is limited to________________?
The maximum depth of sedimentation tanks is limited to________________?A. 2 m
B. 3 m
C. 4 m
D. 5 m
E. 6 mAs per IS : 1172-1963, water required per head per day for average domestic purposes, is_______________?
As per IS : 1172-1963, water required per head per day for average domestic purposes, is_______________?A. 50 litres
B. 65 litres
C. 85 litres
D. 105 litres
E. 135 litresIn distribution pipes, drain valves are provided at_______________?
In distribution pipes, drain valves are provided at_______________?A. lower point
B. higher point
C. junction points
D. any whereThe fire demand of a city may be worked out by _________________?
The fire demand of a city may be worked out by _________________?A. Kuichling’s formula
B. Freeman formula
C. Under Writers formula
D. Bustan’s formula
E. All the above.If four fires break out in a city of population 40 lakhs and if each hydrant has three streams and duration of each fire is four hours, the total quantity of water required, is______________________?
If four fires break out in a city of population 40 lakhs and if each hydrant has three streams and duration of each fire is four hours, the total quantity of water required, is______________________?A. 1880 kilo litres
B. 2880 kilo litres
C. 3880 kilo litres
D. 4880 kilo litres