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. Which one is a waterborne virus infection?

a) malaria

b) cancer

c) dysentery

d) jaundice

2 / 30

2. 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

3 / 30

3. Flush air inlets are sometimes called:

a) ventilated lamp holes

b) well hole

c) clean outs

d) flushing tank

4 / 30

4. Turbidity for domestic water is undesirable because it

a) is unaesthetic

b) causes change of taste

c) gives apparent colour

d) none of the above

5 / 30

5. If the head of water is more than 100 m then the type of pipe used is

a) plastic

b) HDP

c) GI

d) PVC

6 / 30

6. Imhoff tank is a:

a) one-storey sedimentation tank

b) two-storey sedimentation tank

c) three-storey sedimentation tank

d) four-storey sedimentation tank

7 / 30

7. The presence of hydrogen sulfide in water causes:

a) softening

b) acidity

c) alkalinity

d) bad taste

8 / 30

8. The per capita consumption of a locality will be more when

a) good-quality water is supplied

b) during summer months

c) distribution pressure is increased

d) all of the above

9 / 30

9. The color of septic sewage is:

a) grey

b) black

c) white

d) blue

10 / 30

10. Size of colloidal particles present in water is

a) 10 to 10^-1 mm

b) 10^-1 to 10^-3 mm

c) 10^-3 to 10^-6 mm

d) 10^-6 to 10^-9 mm

11 / 30

11. The design discharge for the separate sewer system is taken equal to:

a) dry weather flow

b) 2x dry weather flow

c) 4x dry weather flow

d) 6x dry weather flow

12 / 30

12. 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

13 / 30

13. To compensate for losses, thefts, and wastage of water, an allowance made of (as per NWSC)

a) 5%

b) 10%

c) 15%

d) 35%

14 / 30

14. If Q is discharge in cubic meters per second and D is the economical diameter of the pipe, then according to Lea

a) D = 0.67 to 0.87 √Q

b) D = 0.67 to 0.97 √Q

c) D = 0.97 to 1.22 √Q

d) D = 1.22 to 1.32 √Q

15 / 30

15. Purest water may have

a) no colour

b) faint blue-green colour

c) dark blue colour

d) brownish-yellow colour

16 / 30

16. Grit obtained in a grit chamber is used for:

a) as a manure

b) as a soil conditioner

c) as a coarse aggregate

d) as a substitute for sand

17 / 30

17. Thrust blocks are installed wherever there is a

a) change in the direction or size of the pipeline

b) change in the pressure line diagram

c) pipeline ends at a dead end

d) all of the above

18 / 30

18. 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

19 / 30

19. In order to consider temperature changes, metal pipes are usually provided with

a) expansion joints

b) contraction joints

c) anchorages

d) pressure relief valves

20 / 30

20. Designation of GI pipe is done with:

a) internal diameter

b) external diameter

c) center line

d) none of the above

21 / 30

21. The pressure at the inlet and outlet in a break pressure tank is

a) zero and 1 m

b) 1 m and zero

c) zero and zero

d) 1 m and 1 m

22 / 30

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

a) 90%

b) 75%

c) 85%

d) 70%

23 / 30

23. Non-scouring velocity in concrete sewer is caused by:

a) 2.5 to 3.0 m/sec

b) 2.5 to 3.5 m/sec

c) 1.5 to 2.5 m/sec

d) 0.6 to 1.2 m/sec

24 / 30

24. A manhole of such depth that an access shaft is required in addition to the working chamber, is called.....:

a) shallow manhole

b) medium manhole

c) deep manhole

d) none of the above

25 / 30

25. The common pipe used in house plumbing is:

a) PVC

b) HDPE

c) GI

d) CI

26 / 30

26. The sewer meant to carry excess discharge from an existing sewer is called:

a) main sewer

b) trunk sewer

c) outfall sewer

d) relief sewer

27 / 30

27. Turbidity can be removed by

a) coagulation and filtration

b) aeration and sedimentation

c) activated carbon adsorption

d) disinfections

28 / 30

28. 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

29 / 30

29. The minimum size of a fire hydrant is:

a) 5 cm

b) 10 cm

c) 15 cm

d) 50 cm

30 / 30

30. If the diameter of a sewer is 150 mm, the gradient required for generating a self-cleaning velocity is:

a) 1 in 10

b) 1 in 100

c) 1 in 200

d) 1 in 300

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