Water Supply & Sanitation Engineering Online Test – Paper 2

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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. The maximum diameter of a sewer pipe should preferably be:

a) 100 cm

b) 200 cm

c) 300 cm

d) 450 cm

2 / 30

2. The pump does not require any power, energy, fuel, etc., for its working is

a) centrifugal

b) hydraulic ram

c) reciprocating

d) rotary

3 / 30

3. Sewage is treated by aerobic bacteria action in:

a) septic tank

b) settling tank

c) trickling filter

d) oxidation pond

4 / 30

4. In an egg-shaped sewer section, the maximum discharge occurs when the depth of flow is: (where d is the total depth of the section)

a) 0.25d

b) 0.50d

c) 0.75d

d) 0.95d

5 / 30

5. The peak water consumption hours as recommended by the Department of Water Supply and Sewerage (DWSS) is.... hours.

a) 5.00-7.00

b) 7.00-12.00

c) 12.00-17.00

d) 17.00-19.00

6 / 30

6. Normally the shape of the demand line is

a) straight

b) curved

c) both of the above

d) none of the above

7 / 30

7. Aeration of water is done to

a) remove carbon dioxide and taste in water

b) remove taste and odour in water

c) increase the quantity of oxygen in water

d) all of the above

8 / 30

8. Sewer preferred for a combined system of sewage is:

a) rectangular sewer

b) circular sewer

c) egg-shaped sewer

d) all of the above

9 / 30

9. 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

10 / 30

10. A wrong nominal internal diameter in mm for a cast iron (spun) pipe is

a) 300

b) 400

c) 500

d) 550

11 / 30

11. Clean out is provided in the underground......sewer in place of manhole.

a) main sewer

b) trunk sewer

c) outfall sewer

d) lateral sewer

12 / 30

12. 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

13 / 30

13. GI pipe coming from both sides is joined with a fitting called:

a) Tee

b) Union

c) Elbow

d) Socket

14 / 30

14. The types of formwork provided for ferrocement tank in rural water supply schemes are

a) steel

b) wood

c) HDP pipe

d) all of the above

15 / 30

15. Nahni trap is made of:

a) mud

b) cast iron

c) steel

d) all of the above

16 / 30

16. Source of water in the mountains is:

a) tube well

b) well

c) stream

d) none of the above

17 / 30

17. Dug wells or open wells

a) have a diameter between 1 to 4m

b) are suitable for a small discharge of about 20cum/hour

c) are cheap in construction

d) all of the above

18 / 30

18. If you have to design a simple water filtration unit for a community water supply system in Biratnagar, which type of filter will you choose in general?

a) slow sand filter

b) rapid sand filter

c) trickling filter

d) pressure filter

19 / 30

19. The water supply demand in a fully plumbed system in Nepal context

a) 45 lpcd

b) 65 lpcd

c) 112 lpcd

d) 135 lpcd

20 / 30

20. A manhole is generally provided at each:

a) bend

b) junction

c) change of gradient

d) change of sewer diameter

21 / 30

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

a) 90%

b) 75%

c) 85%

d) 70%

22 / 30

22. A flight sewer is provided when the gradient is:

a) low

b) steep

c) maximum (i.e., vertical)

d) zero

23 / 30

23. The ratio of maximum to average sewage flow for mains up to 1 m in diameter is usually:

a) 1.0

b) 1.2

c) 1.5

d) 2.0

24 / 30

24. The amount of BOD in domestic water should be

a) 1 ppm

b) 2 ppm

c) 3 ppm

d) nil

25 / 30

25. Self-purification of natural streams is caused due to

a) dilution

b) oxygen reduction

c) sunlight

d) all of the above

26 / 30

26. 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

27 / 30

27. Advantage of pressure conduits is

a) flow is independent of the grade of the hydraulic grade line

b) economical since it follows a shorter path

c) less chance of water pollution as it is closed

d) all of the above

28 / 30

28. 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

29 / 30

29. Dengue is termed as which type of disease?

a) Waterborne

b) Water washed

c) Water based

d) Water related

30 / 30

30. Widely used pipe for rural water supply in Nepal is:

a) HDPE pipes

b) GI pipes

c) PVC pipes

d) CI pipes

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Water Supply & Sanitation Engineering Online Test – Paper 2

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