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 types of sewer suitable for a separate system where discharge is uniform are:

a) egg-shaped

b) horse-shoe

c) circular

d) elliptical

2 / 30

2. Coefficient of permeability is maximum for

a) clean gravel

b) clay

c) fine sand

d) silt

3 / 30

3. Presence of algae in water indicates that the water is

a) hard

b) soft

c) acidic

d) pure

4 / 30

4. Aeration of water is done by

a) spray nozzles

b) cascading

c) trickling bed

d) all of the above

5 / 30

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

a) low

b) steep

c) maximum (i.e., vertical)

d) zero

6 / 30

6. 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

7 / 30

7. 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

8 / 30

8. At the socket and spigot joint,

a) the enlarged end of the pipe is called a socket

b) the normal end of the pipe is called a spigot

c) the spigot is fitted into the socket

d) all of the above

9 / 30

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

a) more depth

b) less depth

c) more discharge

d) less discharge

10 / 30

10. Letache is observed in:

a) septic tank

b) sewage

c) landfill

d) none of the above

11 / 30

11. The SODIS method of water purification is a process of:

a) Chlorination

b) Solar disinfection

c) System of disinfected integral supply

d) Supply of disinfected and improved water system

12 / 30

12. To determine the velocity of the flow of underground water, the most commonly used non-empirical formula is....formula:

a) Darcy's

b) Slitcher's

c) Hazen's

d) Lacy's

13 / 30

13. Sluice valves in main water supplies are

a) used to regulate the flow

b) spaced about 5 km apart

c) generally provided at the summits

d) all of the above

14 / 30

14. Which type of distribution system will you follow if the reduced level of the source of water is 100 m while the reduced level of the town is 50 m?

a) gravity system

b) pumping system

c) dual system

d) none of the above

15 / 30

15. After incubating a 2.5% solution of a sewage sample for 5 days at 20°C, the depletion of oxygen was found to be 5 PPM. The BOD of the sewage will be recorded as:

a) 5 PPM

b) 50 PPM

c) 100 PPM

d) 200 PPM

16 / 30

16. Nahni trap is made of:

a) mud

b) cast iron

c) steel

d) all of the above

17 / 30

17. Gastrointestinal irritation is produced because of excess of the following in water

a) chlorides

b) sulphates

c) nitrates

d) phosphates

18 / 30

18. 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

19 / 30

19. Which one is correct?

a) Baylis turbidity meter is used to measure turbidity 0-20 PPM

b) Hellige turbidity meter is used to measure turbidity 0-50 PPM

c) Jackson turbidity meter is used to measure turbidity 50-1000 PPM

d) all of the above

20 / 30

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

a) copper

b) concrete

c) asbestos cement

d) cast iron

21 / 30

21. In the one-pipe system of plumbing, the number of vertical pipes is:

a) 1

b) 2

c) 3

d) 4

22 / 30

22. Anti-siphonage pipe is connected to:

a) Top of PWC

b) Bottom of PWC

c) In the main pipe

d) None of the above

23 / 30

23. The best sewer material to resist hydrogen sulfide corrosion is:

a) RCC

b) brick masonry

c) glazed stoneware

d) asbestos cement

24 / 30

24. Shrouding is the process of filling gravel, bajri, etc., in

a) slotted tube well

b) strainer tube well

c) perforated tube well

d) cavity tube well

25 / 30

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

a) 90%

b) 75%

c) 85%

d) 70%

26 / 30

26. Sewerage system is designed for:

a) maximum flow only

b) minimum flow only

c) average flow only

d) maximum and minimum flow

27 / 30

27. 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

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. 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

30 / 30

30. In water analysis, the test carried out is

a) physical

b) chemical

c) biological

d) all of the above

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