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

a) HDPE pipes

b) GI pipes

c) PVC pipes

d) CI pipes

2 / 30

2. Which metal is good for keeping drinking water?

a) copper

b) brass

c) zinc

d) iron

3 / 30

3. 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

4 / 30

4. Traddle pump is operated by

a) hand

b) foot

c) electric

d) all of the above

5 / 30

5. When the fall in elevation is greater than 60cm, the manhole provided is called:

a) lamp hole

b) flight manhole

c) drop manhole

d) fall manhole

6 / 30

6. GI pipe coming from both sides is joined with a fitting called:

a) Tee

b) Union

c) Elbow

d) Socket

7 / 30

7. The asbestos cement pipes are generally laid

a) horizontally

b) vertically

c) in any position

d) inclined at 60°

8 / 30

8. A circular section of sewer has the advantage of:

a) least parameter for a given area

b) offers the least opportunities for deposits

c) more suitable when the discharge is approximately constant

d) all of the above

9 / 30

9. 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

10 / 30

10. A good source of water requiring practically least treatment is

a) perennial river

b) impounded reservoir

c) deep well

d) elevated lake

11 / 30

11. 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

12 / 30

12. The clarigesters are:

a) circular septic tanks

b) circular imhoff double storage tanks without bottom hoppers

c) rectangular septic tanks

d) none of the above

13 / 30

13. Most common sources of water in hill and terai in our country are...respectively.

a) surface and ground

b) ground and surface

c) surface and surface

d) ground and ground

14 / 30

14. Aeration of water is done by

a) spray nozzles

b) cascading

c) trickling bed

d) all of the above

15 / 30

15. The quantity of flushing water required for pour-flush water seal latrine is:

a) 0.5-1.5 litres

b) 1.5-2.0 litres

c) 2.0-3.0 litres

d) 3.0-4.0 litres

16 / 30

16. The commonly used material for water supply pipes having the property of not easily corroded, strong, long life but heavy and brittle is

a) steel

b) cast iron

c) wrought iron

d) RCC

17 / 30

17. Ovoid sewers are best suited for:

a) separate system

b) combined system with less fluctuations

c) combined system with very wide fluctuations

d) outfall sewer

18 / 30

18. HGL should always be...... above the GL

a) 5 m

b) 10 m

c) 15 m

d) 20 m

19 / 30

19. The maximum diameter of a sewer pipe should preferably be:

a) 100 cm

b) 200 cm

c) 300 cm

d) 450 cm

20 / 30

20. Which is in the correct order?

a) house s.-Lateral s.-Branch s.-Sub-main s.-Main (Trunk)-outfall sewer

b) house s.-Lateral s.-Branch s.-Sub-main s.-Outfall s.-Main (Trunk) sewer

c) main (Trunk)-Outfall s.-House s.-Lateral s.-Branch s.-Sub-main sewer

d) lateral s.-Branch s.-Sub-main s.-Main (Trunk)-Outfall s-House sewer

21 / 30

21. Break pressure tank in a water supply system is incorporated to:

a) Store water under pressure

b) Treat water by adequate pressure

c) Release the pressure generated in the pipe

d) Break the pressure

22 / 30

22. 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

23 / 30

23. PH value of water for water supply

a) 6.5 to 8.5

b) 5.5 to 7.0

c) 7.0 to 9.5

d) 5.5 to 9.5

24 / 30

24. In distribution pipes, drain valves are provided at

a) lower point

b) higher point

c) junction points

d) anywhere

25 / 30

25. Mass action' during sedimentation is the property of:

a) decrease in mass of sludge

b) settling of a particle along with the neighboring particle

c) quick spreading of floc

d) increase in mass of sludge

26 / 30

26. 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

27 / 30

27. In strainer type wells

a) the flow is radial

b) the flow is spherical

c) area of flow depends upon the size of the cavity

d) all of the above

28 / 30

28. The flow in the sewers is minimum during which hours?

a) Night

b) Morning

c) Day

d) Evening

29 / 30

29. Pump efficiency is 85%, motor efficiency is 94% then the combined efficiency of the two is

a) 90%

b) 80%

c) 70%

d) 85%

30 / 30

30. 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

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