Average annual rainfall at any station is the average of annual rainfall over a period of________________?

Related Mcqs:

1. 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 litres

2. 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 times

3. The underground sources of water, is from______________?

   Pick up the incorrect statement from the following?

   A. wells
   B. springs
   C. infiltration wells
   D. storage reservoirs
   E. none of these

4. The maximum depth of sedimentation tanks is limited to________________?

   A. 2 m
   B. 3 m
   C. 4 m
   D. 5 m
   E. 6 m

5. 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
   E. none of these

6. Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be________________?

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

7. In distribution pipes, drain valves are provided at_______________?

   A. lower point
   B. higher point
   C. junction points
   D. any where

8. Asbestos pipes are ______________?

   A. light in weight and easy to transport
   B. highly resistant to corrosion
   C. high flexible to accommodate deflection upto 12°
   D. very much smooth and hydraulically efficient
   E. all the above

9. Aeration of water is done to remove______________?

   A. odour
   B. colour
   C. bacterias
   D. hardness
   E. turbidity

10. 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