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. 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

2 / 30

2. According to the guidelines of DWSS, the maximum number of users in each stand post should be:

a) 50

b) 100

c) 150

d) 200

3 / 30

3. The types of pipe which are generally laid vertically due to low strength is

a) copper

b) concrete

c) asbestos cement

d) cast iron

4 / 30

4. During the water test of sewer, 2 lit/cm of dia/km of sewer line may be allowed for a period of:

a) 5 minutes

b) 30 minutes

c) 15 minutes

d) 20 minutes

5 / 30

5. Time of concentration depends upon:

a) slope of the catchment

b) intensity of rainfall

c) nature of soil

d) all of the above

6 / 30

6. Most suitable section, when the maximum and minimum flow ratio is not much, is:

a) circular section

b) rectangular section

c) horse-shoe section

d) egg-shaped section

7 / 30

7. As compared to shallow tube wells, deep wells have

a) more depth

b) less depth

c) more discharge

d) less discharge

8 / 30

8. Total quantity of reservoir is the sum of the following

a) breakdown reserve

b) fire reserve

c) all of the above

d) balancing reserve

9 / 30

9. Disinfection of water involves.....

a) killing of diseases bacteria

b) produce of diseases of water

c) no change diseases bacteria

d) none of the above

10 / 30

10. Harmful bacteria are called:

a) Parasites

b) Anaerobic bacteria

c) Aerobic bacteria

d) Pathogens

11 / 30

11. The factor for the selection of the pumping station site is

a) distance of the source of contamination or pollution

b) height above the H.F.L. of the river

c) future expansion

d) all of the above

12 / 30

12. When the limiting non-scouring velocity is 5 m/sec, the type of sewer generally used is:

a) stone ware sewer

b) cast iron sewer

c) brick sewer

d) glazed brick sewer

13 / 30

13. Asbestos pipes are

a) highly resistant to corrosion

b) light in weight and easy to transport

c) highly flexible to resist deflection up to 120

d) very smooth

14 / 30

14. The main function of a manhole is:

a) cleaning of sewer

b) inspection of sewer

c) joining different types of sewer

d) joining different grade of sewer

15 / 30

15. The devices installed for drawing water from the sources are called

a) filters

b) intakes

c) aquifers

d) none of the above

16 / 30

16. Gravity conduits are generally in the form of

a) open channels

b) conduits

c) tunnels

d) all of the above

17 / 30

17. A structure constructed where self-cleaning velocity is not developed to prevent choking is called:

a) catch basin

b) flushing tank

c) manhole

d) inverted siphon

18 / 30

18. An egg-shaped section of sewer:

a) is economical than a circular section

b) is more stable than a circular section

c) provides self-cleansing velocity at low discharge

d) all of the above

19 / 30

19. A communicable disease is

a) cancer

b) fluorosis

c) tuberculosis

d) goitre

20 / 30

20. The depression of the water table in a well due to pumping will be maximum

a) at a distance r from the well

b) at a distance r/2 from the well

c) close to the well

d) none of the above

21 / 30

21. Sanitary sewage means:

a) domestic sewage

b) industrial sewage

c) both (a) and (b) above

d) none of the above

22 / 30

22. Which metal is good for keeping drinking water?

a) copper

b) brass

c) zinc

d) iron

23 / 30

23. If in the relative stability test on sewage, the period of incubation at 20°C is 15 days, the relative stability is:

a) 95.95%

b) 96.05%

c) 96.86%

d) 100%

24 / 30

24. B-coli tests are conducted to serve as a

a) very good indicator of pathogenic bacteria

b) very good indicator of acidity

c) very good indicator of alkalinity

d) means of detecting turbidity

25 / 30

25. 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

26 / 30

26. Any trap is intended to trap foul gases with the provision of:

a) clear seal

b) sewage or sullage

c) otta seal

d) water seal

27 / 30

27. The most widely used tube well in Nepal is

a) strainer well

b) cavity well

c) slotted

d) perforated well

28 / 30

28. 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

29 / 30

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

a) HDPE pipes

b) GI pipes

c) PVC pipes

d) CI pipes

30 / 30

30. Slow sand filter is efficient to remove bacteria from the raw water to an extent of:

a) 50%

b) 70%

c) 85%

d) 99%

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