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. From the septic tank, the effluents are discharged into:

a) drainage

b) soak pit

c) sewer

d) none of the above

2 / 30

2. A 1 m cast iron pipe carries a discharge of 0.785 cum/sec, the velocity of flow will be

a) 0.9 m/sec

b) 1.0 m/sec

c) 1.2 m/sec

d) none of the above

3 / 30

3. A lamp hole is helpful in:

a) illuminating sewer line

b) cleaning sewer line

c) repairing

d) testing sewers

4 / 30

4. The interference of the well depends upon

a) the number of wells

b) spacing between wells

c) types of wells

d) all of the above

5 / 30

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

a) 45 lpcd

b) 65 lpcd

c) 112 lpcd

d) 135 lpcd

6 / 30

6. 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

7 / 30

7. Grit chamber has a detention period of:

a) 45 sec to 90 sec

b) 2 min to 5 min

c) 20 min to 30 min

d) 2 hours to 4 hours

8 / 30

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

a) expansion joints

b) contraction joints

c) anchorages

d) pressure relief valves

9 / 30

9. The pressure at the inlet and outlet in a break pressure tank is

a) zero and 1 m

b) 1 m and zero

c) zero and zero

d) 1 m and 1 m

10 / 30

10. Selection of material for the pipe depends on

a) carrying capacity of the pipe

b) durability and life of the pipe

c) effect of water to be conveyed on the pipe material

d) all of the above

11 / 30

11. The relation between porosity, specific yield, and specific retention is given by

a) porosity = specific yield + specific retention

b) porosity = specific yield - specific retention

c) specific yield = porosity + specific retention

d) none of the above

12 / 30

12. 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

13 / 30

13. A complete water supply system includes:

a) construction of intake and collection chamber

b) digging of a well for water

c) construction of a dam for a reservoir

d) the entire arrangement from source to distribution

14 / 30

14. Traddle pump is operated by

a) hand

b) foot

c) electric

d) all of the above

15 / 30

15. 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

16 / 30

16. 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

17 / 30

17. Most commonly used section in the grade aqueduct is

a) circular

b) rectangular

c) parabolic

d) all of the above

18 / 30

18. A septic tank is a watertight tank where the following operation(s) take place:

a) sedimentation

b) sedimentation + digestion (anaerobic)

c) digestion (aerobic)

d) decomposition of organic and inorganic matter by bacteria

19 / 30

19. Turbidity is undesirable because it

a) renders waters unpalatable

b) affects photosynthesis of aquatic life

c) causes milky unite coloration to water

d) causes red and brown stains

20 / 30

20. 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

21 / 30

21. A source of colour in water is due to

a) silt

b) clay

c) organic debris

d) inorganic inert matter

22 / 30

22. Pick up the correct statement:

a) If PH<7 then sewage is acidic

b) If PH>7 then sewage is alkaline

c) If PH=7 the sewage is neutral

d) all of the above

23 / 30

23. Service connections to consumer houses are generally provided with

a) copper pipes

b) PVC pipes

c) galvanized pipes

d) cast iron pipes

24 / 30

24. Goaty water refers to...

a) odour of water

b) turbidity of water

c) colour of water

d) all of the above

25 / 30

25. 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

26 / 30

26. Which is the oldest waterworks in Nepal?

a) Bhim Dhara scheme

b) Bir Dhara scheme

c) Sundarijal scheme

d) Dudh Pokhari scheme

27 / 30

27. The minimum diameter of a sewer pipe should be:

a) 5 cm

b) 10 cm

c) 15 cm

d) 25 cm

28 / 30

28. Thrash rack/roughing filter is provided at the entrance of

a) intake

b) slow sand filter

c) rapid sand filter

d) all of the above

29 / 30

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

a) main sewer

b) trunk sewer

c) outfall sewer

d) lateral sewer

30 / 30

30. The object of cowl is to:

a) give an ornamental look

b) prevent the entry of rainfall into the waste pipe

c) quickly dispel foul gases

d) prevent nest building

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Water Supply & Sanitation Engineering Online Test – Paper 2

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