Water Supply & Sanitation Engineering Online Test

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Vikash chaudhary

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Total Questions: 30
Time Allotted: 30 minutes
Passing Score: 50%
Randomization: Yes
Certificate: No
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1 / 30

1. Mass curve is used for the determination of

a) area of reservoir

b) depth of reservoir

c) capacity of reservoir

d) all of the above

2 / 30

2. The coverage of water supply in Nepal as per the census of 2011 is

a) 90%

b) 75%

c) 85%

d) 70%

3 / 30

3. Tuberculation is caused in a metal pipe due to

a) sulphur-reducing bacteria

b) nitrogen-reducing bacteria

c) oxygen-reducing bacteria

d) phosphorus of total water demand

4 / 30

4. The main pipes must be designed to carry

a) 3 times the average demand

b) 4 times the average demand

c) 1 times the average demand

d) 2 times the average demand

5 / 30

5. For areas of distributed rainfall throughout the year with less intensity, the suitable system of sanitation is:

a) separate system

b) combined system

c) partially separate system

d) partially combined system

6 / 30

6. In Chezy's formula v=c√ms for calculating the velocity of flow in a circular sewer, the Chezy's constant c depends upon:

a) size of the sewer

b) shape of the sewer

c) roughness of the sewer

d) all of the above

7 / 30

7. The types of diseases caused due to the lack of water are known as

a) waterborne

b) water-washed

c) water-based

d) water vector

8 / 30

8. Copper pipes are

a) highly resistant to acidic and alkaline water

b) easy to bend and do not sag if used for hot water supply

c) not liable to corrosion

d) all of the above

9 / 30

9. Before entering a manhole, a candle is lowered into the manhole:

a) to illuminate it

b) to detect toxic gases

c) to give a signal to the adjacent manhole

d) to find out the presence of oxygen

10 / 30

10. The gradient of a sewer is:

a) given in the direction of the natural slope of the ground

b) given in the opposite direction of the natural slope of the ground

c) zero

d) more than 1 in 20

11 / 30

11. Manhole is said to be deep if its depth is more than:

a) 1.5 m

b) 1.70 m

c) 1.9 m

d) 2.1 m

12 / 30

12. Manholes on sewer lines are provided for:

a) periodic cleaning

b) providing air for oxidation

c) removal of part of sewerage

d) all of the above

13 / 30

13. Septic tank effluent is:

a) quite clear and sparkling

b) always odorless

c) having fine organic solids with high BOD

d) black tarry liquor with an earthy odor

14 / 30

14. Most commonly used section in the grade aqueduct is

a) circular

b) rectangular

c) parabolic

d) all of the above

15 / 30

15. Groundwater is generally free from

a) suspended impurities

b) dissolved impurities

c) both (a) and (b) of the above

d) none of the above

16 / 30

16. Following material is used during drilling to prevent caving

a) bentonite

b) thixotropy

c) both (a) and (b) above

d) none of the above

17 / 30

17. The velocity of water in water mains of 40 cm diameter is usually kept

a) below 0.5 m/sec

b) below 5 m/sec

c) below 1.8 m/sec

d) below 18 m/sec

18 / 30

18. "A right-angled sleeve (valve) connected in the water main through which water is tapped for domestic supply is called:

a) service pipe

b) goose neck

c) ferrule

d) stop tap

19 / 30

19. Pressure relief valve is provided to prevent

a) the increase of pressure after a certain limit

b) back flow when the pump is stopped

c) the water flowing out of the suction pipe

d) none of the above

20 / 30

20. The design discharge for the combined system shall be taken equal to:

a) rainfall

b) rainfall + dry weather flow

c) rainfall + 2× dry weather flow

d) rainfall + 4× dry weather flow

21 / 30

21. Merit of water carriage sewage system:

a) no human agency is involved in this system

b) no problem of foul smell or hygienic trouble

c) less area is required

d) all of the above

22 / 30

22. The standard BOD at 20°C is taken for the consumption in:

a) 20 days

b) 15 days

c) 10 days

d) 5 days

23 / 30

23. The underground structure in the form of a circular or rectangular tank for the purpose of admitting sewerage into it from the intercepting chamber is called:

a) Soak pit

b) septic tank

c) Cesspool

d) privy pit

24 / 30

24. Impetus valve/waste valve is provided in

a) hydraulic ram

b) centrifugal pump

c) rotary pump

d) all of the above

25 / 30

25. The layout of the distribution system that is suitable for haphazardly growing cities is:

a) dead-end system

b) grid iron system

c) ring system

d) radial system

26 / 30

26. The highest non-scouring velocity in a sewer may be allowed in:

a) cast iron sewer

b) glazed brick sewer

c) cement concrete

d) stone ware sewer

27 / 30

27. Gravity conduits

a) carry water under gravity

b) follow the hydraulic gradient line

c) are carried through tunnels in deep cutting

d) all of the above

28 / 30

28. As compared to cast iron pipes, steel pipes are

a) stronger

b) heavier

c) costlier

d) all of the above

29 / 30

29. The water supply system whose main, sub-main, and branches are interconnected with each other is:

a) dead-end system

b) grid iron system

c) ring system

d) radial system

30 / 30

30. A sewer, which receives the discharge of a number of house sewers, is called:

a) house sewer

b) lateral sewer

c) intercepting sewer

d) sub-main sewer

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