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. 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

2 / 30

2. 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

3 / 30

3. Time of concentration depends upon:

a) slope of the catchment

b) intensity of rainfall

c) nature of soil

d) all of the above

4 / 30

4. 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

5 / 30

5. Which of the following impurities in water is removed by the sedimentation process?

a) total dissolved solids

b) bacteria

c) iron and manganese

d) suspended solids

6 / 30

6. 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

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. Merit of water carriage sewage system:

a) no human agency is involved in this system

b) no problem of foul smell or hygienic trouble

c) less area is required

d) all of the above

9 / 30

9. 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

10 / 30

10. The factor for the selection of the pumping station site is

a) distance of the source of contamination or pollution

b) height above the H.F.L. of the river

c) future expansion

d) all of the above

11 / 30

11. Scour valves are provided

a) at every summit of rising mains

b) at very depression and dead ends to drain out the waste water that may collect there

c) at street corners to control the flow of water

d) all of the above

12 / 30

12. When more than two sewers join in a manhole:

a) their tops should be at the same level

b) their centers should be at the same level

c) their bottoms should be at the same level

d) they can be either way

13 / 30

13. Physical characteristics of sewage include:

a) Turbidity

b) Color

c) Odor

d) All of the above

14 / 30

14. If the diameter of the main pipe is taken less than the economical diameter, then

a) head loss will be high

b) cost of pipe will be less

c) cost of pumping will be more

d) all of the above

15 / 30

15. 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

16 / 30

16. Sewer which gets discharge from two or more main sewers is called:

a) main sewer

b) trunk sewer

c) combined sewer

d) intercepting sewer

17 / 30

17. Steel pipes are

a) generally laid underground and no expansion joint is required

b) connected by riveted or welded joints

c) suitable for withstanding high internal pressure

d) all of the above

18 / 30

18. An advantage of the intermittent system of the water supply system:

a) Repairs can be carried out during non-supply hours

b) Chances of wastage of water are less

c) Less quantity of water is used

d) All of the above

19 / 30

19. Sewer preferred for a combined system of sewage is:

a) rectangular sewer

b) circular sewer

c) egg-shaped sewer

d) all of the above

20 / 30

20. The asbestos cement pipes are generally laid

a) horizontally

b) vertically

c) in any position

d) inclined at 60°

21 / 30

21. The pipe used to carry discharge from sanitary fittings like bathrooms, kitchens, etc., is:

a) waste pipe

b) soil pipe

c) vent pipe

d) anti-siphonage pipe

22 / 30

22. The design discharge for the combined system shall be taken equal to:

a) rainfall

b) rainfall + dry weather flow

c) rainfall + 2× dry weather flow

d) rainfall + 4× dry weather flow

23 / 30

23. When the limiting non-scouring velocity is 5 m/sec, the type of sewer generally used is:

a) stone ware sewer

b) cast iron sewer

c) brick sewer

d) glazed brick sewer

24 / 30

24. Hydrants are used for tapping water from mains for:

a) fire extinguishing

b) street washing

c) flushing sewer lines

d) all of the above

25 / 30

25. 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

26 / 30

26. Which device warns that the liquid is above the pump level?

a) High-level alarm

b) Check valve

c) Union

d) Pump lift chain

27 / 30

27. The service pipes must be designed to carry

a) 3 times the average demand

b) 4 times the average demand

c) 1 times the average demand

d) 2 times the average demand

28 / 30

28. Factors considered in the selection of the site for the intake point are that it should be

a) nearer to the treatment plant

b) in the pure zone of the water source

c) upstream of the point of disposal of wastewater

d) all of the above

29 / 30

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

a) perennial river

b) impounded reservoir

c) deep well

d) elevated lake

30 / 30

30. The amount of BOD in domestic water should be

a) 1 ppm

b) 2 ppm

c) 3 ppm

d) nil

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Water Supply & Sanitation Engineering Online Test – Paper 2

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