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. Highly colored waters are

a) unaesthetic

b) highly polluted

c) require elaborate

d) rich in iron and manganese.

2 / 30

2. A circular gravity aqueduct is preferred because of

a) its maximum hydraulic mean depth

b) maximum area per unit of wetted perimeter

c) minimum cost of construction

d) all of the above

3 / 30

3. Which traps have curved legs?

a) P-Trap

b) Q-Trap

c) gully trap

d) S-Trap

4 / 30

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

a) Darcy's formula

b) Slitcher's formula

c) Hazen's formula

d) Lacy's formula

5 / 30

5. Which traps have perpendicular legs?

a) P-Trap

b) Q-Trap

c) gully trap

d) S-Trap

6 / 30

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

a) hard

b) soft

c) acidic

d) pure

7 / 30

7. PVC pipes can withstand pressure up to

a) 20 m head of water

b) 50 m head of water

c) 100 m head of water

d) 150 m head of water

8 / 30

8. Gravity conduits

a) carry water under gravity

b) follow the hydraulic gradient line

c) are carried through tunnels in deep cutting

d) all of the above

9 / 30

9. A communicable disease is

a) cancer

b) fluorosis

c) tuberculosis

d) goitre

10 / 30

10. 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

11 / 30

11. 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

12 / 30

12. Imhoff tank is a:

a) one-storey sedimentation tank

b) two-storey sedimentation tank

c) three-storey sedimentation tank

d) four-storey sedimentation tank

13 / 30

13. Surface water is obtained from

a) well

b) spring

c) artesian well

d) rain

14 / 30

14. Laying of a sewer is generally done with the help of:

a) sight rails and boning rod

b) theodolite and staff

c) leveling and staff

d) all of the above

15 / 30

15. Infiltration gallery is a

a) horizontal well

b) vertical well

c) inclined well

d) none of the above

16 / 30

16. 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

17 / 30

17. It is practical to design sewer for the self-cleaning velocity at:

a) Ultimate peak flow

b) Maximum flow

c) Minimum flow

d) Extra flow

18 / 30

18. Mass curve is used for the determination of

a) area of reservoir

b) depth of reservoir

c) capacity of reservoir

d) all of the above

19 / 30

19. 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

20 / 30

20. Goaty water refers to...

a) odour of water

b) turbidity of water

c) colour of water

d) all of the above

21 / 30

21. Turbidity can be removed by

a) coagulation and filtration

b) aeration and sedimentation

c) activated carbon adsorption

d) disinfections

22 / 30

22. Turbidity is measured on..........

a) standard silica scale

b) standard cobalt scale

c) diagonal scale

d) none of the above

23 / 30

23. Abbreviation which is correct?

a) TOC (Total Organic Carbon)

b) ThOD (Theoretical Oxygen Demand)

c) TOD (Total Oxygen Demand)

d) all of the above

24 / 30

24. 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

25 / 30

25. The standard BOD at 20°C is taken for the consumption in:

a) 20 days

b) 15 days

c) 10 days

d) 5 days

26 / 30

26. The ratio of the maximum daily consumption to the average demand is

a) 1.2

b) 1.5

c) 1.8

d) 2.7

27 / 30

27. If D is the diameter of the upper circular portion, the overall depth of a standard egg-shaped section, is:

a) D

b) 1.2D

c) 1.5D

d) 2D

28 / 30

28. Septic tank is provided for:

a) To eliminate the sewer system

b) Tank for sedimentation cum disposal under aerobic conditions

c) Oxygen-free sedimentation cum disposal under anaerobic conditions

d) None of the above

29 / 30

29. Sewerage system is designed for:

a) maximum flow only

b) minimum flow only

c) average flow only

d) maximum and minimum flow

30 / 30

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

a) copper

b) concrete

c) asbestos cement

d) cast iron

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