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. 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

2 / 30

2. The asbestos cement pipes are generally laid

a) horizontally

b) vertically

c) in any position

d) inclined at 60°

3 / 30

3. Turbidity is measured on..........

a) standard silica scale

b) standard cobalt scale

c) diagonal scale

d) none of the above

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. 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

6 / 30

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

a) expansion joints

b) contraction joints

c) anchorages

d) pressure relief valves

7 / 30

7. 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

8 / 30

8. A sanitary sewer is expected to run:

a) full

b) half-full

c) 2/3 full

d) 90% full

9 / 30

9. The suitable system of sanitation for an area having rainfall for only one season is:

a) separate system

b) combined system

c) partially combined system

d) all of the above

10 / 30

10. The water collected for the sample from the

a) 10-20 cm below from the surface

b) 20-30 cm below from the surface

c) 30-40 cm below from the surface

d) 40-50 cm below from the surface

11 / 30

11. A water supply system is said to be continuous when it is supplied for:

a) 6 hrs

b) 12 hrs

c) 18 hrs

d) 24 hrs

12 / 30

12. The disinfection efficiency of chlorination

a) increases with the temperature of water

b) decreases with the temperature of water

c) not affected by temperature

d) none of the above

13 / 30

13. The most dangerous metal for human health is

a) zinc

b) copper

c) lead

d) iron

14 / 30

14. Which traps have perpendicular legs?

a) P-Trap

b) Q-Trap

c) gully trap

d) S-Trap

15 / 30

15. Manhole is said to be medium if its depth is between:

a) 0.7-0.9 m

b) 0.9-1.2 m

c) 0.9-1.3 m

d) 0.9-1.5 m

16 / 30

16. Minimum required residual head at the public tap stand is not less than

a) 15

b) 10

c) 5

d) 20

17 / 30

17. If P is the total internal pressure, d is the diameter of the pressure conduit, and t is the thickness of the conduit, the hoop's stress is

a) d.p / 2t

b) d.p / t

c) d.t / 2p

d) d.t / p

18 / 30

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

a) 45 lpcd

b) 65 lpcd

c) 112 lpcd

d) 135 lpcd

19 / 30

19. Which test is a must for a house sewer?

a) water test

b) air test

c) compaction test

d) smoke test

20 / 30

20. Septic tanks are best suited for:

a) municipalities

b) industries

c) scattered residences

d) congested areas

21 / 30

21. Alum increases

a) hardness of water

b) carbonate of water

c) sulphate of water

d) acidity of water

22 / 30

22. Suitable sewer section for both combined and separate systems is:

a) circular section

b) rectangular section

c) egg-shaped section

d) horse-shoe type section

23 / 30

23. Depth of shallow tube well shall not be more than (considering economic point):

a) 30 m

b) 40 m

c) 50 m

d) 60 m

24 / 30

24. Booster pump is used for

a) water supply

b) sewage pumping

c) pressure increase

d) drinking purposes

25 / 30

25. Source of water in the mountains is:

a) tube well

b) well

c) stream

d) none of the above

26 / 30

26. The diameter of pipes in bathrooms and lavatories in domestic water supply is:

a) 10 mm

b) 12 mm

c) 16 mm

d) 20 mm

27 / 30

27. "Puits developee" is generally provided in case of

a) well

b) tube well

c) reservoir

d) none of the above

28 / 30

28. What will be the daily per capita water demand for a city of 0.2 million people whose total water requirement per annum is 19,710,000 cubic meters?

a) 250 liters

b) 280 liters

c) 270 liters

d) 260 liters

29 / 30

29. Most suitable section of sewer in a separate sewage system is:

a) circular section

b) rectangular section

c) egg-shaped section

d) modified egg-shaped section

30 / 30

30. "Dental Caries" will be absent where the following is present

a) mottled enamel of teeth

b) itai-itai

c) methemoglobinemia

d) cancer

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