water supply engineering Mcqs
1. For determining the velocity of flow of underground water, the most commonly used non-empirical formula is________________?
comments icon0

A. Lacys formula

B. Hazens formula

C. Slichters formula

D. Darcys formula
2. Average annual rainfall at any station is the average of annual rainfall over a period of________________?
comments icon0

A. 14 years

B. 7 years

C. 21 years

D. 28 years

E. 35 years
3. Surge tanks are used_______________?
comments icon0
A. to guard against water hammer

B. to increase the velocity in a pipeline

C. as overflow valves

D. for storage water

4. By boiling water, hardness can be removed if it is due to_________________?
comments icon0

A. calcium sulphate

B. calcium bicarbonate

C. magnesium sulphate

D. calcium nitrate

E. none of these

5. Sunlight_________________ ?
comments icon0
A. impedes growth of algae

B. reduces turbidity

C. increases dissolved oxygen content

D. helps growth of bacterias

6. Corrosion of well pipes may not be reduced by_________________?
comments icon0

A. using thicker pipes

B. reducing the draw down and the pumping rate

C. using screens having larger area of openings

D. reducing the flow velocity

E. none of these

7. Acidity in water is caused due to_______________?
comments icon0

A. Iron sulphate

B. All the above

C. Free CO2

D. Aluminium sulphate

E. Mineral acids

8. In slow sland filters, the turbidity of raw water can be removed only up to_________________?
comments icon0

A. 150 mg/litre

B. 75 mg/litre

C. 100 gm/litre

D. 60 mg/litre
9. The R.L. of ground water table on the sides of a valley is 1505 m whereas R.L. of the stream water is 1475 m. If 60 slope consists of pervious soil between R.L. 1485 m to 1500 m, the gravity spring may be expected at the point of reduced level_______________?
comments icon0

A. 1475 m

B. 1485 m

C. 1505 m

D. 1500 m

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______________________?
comments icon0

A. 1880 kilo litres

B. 3880 kilo litres

C. 2880 kilo litres

D. 4880 kilo litres

11. Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be________________?
comments icon0

A. 15

B. nil

C. 20

D. 5

E. 10

12. The least thickness of class B cast iron (spun) pipe, is_________________?
comments icon0
A. 8.6 mm

B. 7.2 mm

C. 10 mm

D. 7.9 mm

13. The maximum depth of sedimentation tanks is limited to________________?
comments icon0

A. 2 m

B. 5 m

C. 3 m

D. 6 m

E. 4 m

14. Asbestos pipes are ______________?
comments icon0

A. highly resistant to corrosion

B. light in weight and easy to transport

C. very much smooth and hydraulically efficient

D. high flexible to accommodate deflection upto 12

E. all the above
15. Time of concentration________________?
comments icon0

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
16. According to IS : 1172-1963, a minimum of 135 litres of water capita per day, is required for________________?
comments icon0

A. Nurses home and medical quarters

B. Boarding schools

C. all the above

D. hostels

17. The factor affecting per capita demand, is___________________?
comments icon0
A. all the above

B. pressure in water mains

C. cost of water

D. size of the city

E. climatic conditions

18. Disinfection of drinking water, is done to remove_________________?
comments icon0
A. bacterias

B. turbidity

C. colour

D. odour

19. The specific retention is least in case of_______________?
comments icon0

A. Sand

B. Coarse gravel

C. Clay

D. Silt

20. Aeration of water is done to remove______________?
comments icon0

A. turbidity

B. odour

C. colour

D. hardness

E. bacterias

21. The yield of a rapid gravity filter as compared to that of slow sand filter, is__________________?
comments icon0

A. 20 times

B. 15 times

C. 35 times

D. 30 times

E. 10 times

22. In distribution pipes, drain valves are provided at_______________?
comments icon0

A. higher point

B. lower point

C. any where

D. junction points

23. The fire demand of a city may be worked out by _________________?
comments icon0

A. Bustans formula

B. Kuichlings formula

C. Under Writers formula

D. Freeman formula

E. All the above.
24. As per IS : 1172-1963, water required per head per day for average domestic purposes, is_______________?
comments icon0

A. 65 litres

B. 135 litres

C. 50 litres

D. 85 litres

E. 105 litres

25. 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________________?
comments icon0

A. 2.75 m

B. 2.25 m

C. 3.00 m

D. 2.50 m

E. 2 m

26. The underground sources of water, is from______________?
comments icon0

A. k up the incorrect statement from the following?