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

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

Aeration of water is done to remove______________?

A. Odour
B. Colour
C. Bacterias
D. Hardness

Disinfection of drinking water, is done to remove_________________?

A. Odour
B. Bacterias
C. Turbidity
D. Colour

The expected discharge to be obtained from an open well sunk in coarse sand is 0.0059 cumec. If the working depression head of the well is 3 m, the minimum diameter of the well, is________________?

A. 2 m
B. 2.25 m
C. 2.50 m
D. 2.75 m

Time of concentration________________?

A. Is the time taken, for precipitation
B. Duration of rainfall.
C. Time taken for all the ran off to reach the drain
D. Time taken for the storm water to travel from the most remote point to the drain

In slow sland filters, the turbidity of raw water can be removed only up to_________________?

A. 60 mg/litre
B. 75 mg/litre
C. 100 gm/litre
D. 150 mg/litre

Acidity in water is caused due to_______________?

A. mineral acids
B. free co2
C. iron sulphate
D. aluminium sulphate

Corrosion of well pipes may not be reduced by_________________?

A. Reducing the draw down and the pumping rate
B. Reducing the flow velocity
C. Using thicker pipes
D. Using screens having larger area of openings

The maximum depth of sedimentation tanks is limited to________________?

A. 2 m
B. 3 m
C. 4 m
D. 5 m