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. In the two-pipe system of plumbing, the number of vertical pipes is:

a) 1

b) 2

c) 3

d) 4

2 / 30

2. Velocity of flow through a grit chamber is:

a) 30 to 60 cm/sec

b) 30 to 60 cm/min

c) 15 to 45 cm/sec

d) 15 to 45 cm/min

3 / 30

3. With the increase in the size of the water pipe, the permissible velocity (If discharge is constant)

a) decreases

b) increases

c) remains constant

d) none of the above

4 / 30

4. 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

5 / 30

5. Following material is used during drilling to prevent caving

a) bentonite

b) thixotropy

c) both (a) and (b) above

d) none of the above

6 / 30

6. Water demand for public use as compared to the total demand, kept in the design of waterworks for a city, is

a) 5%

b) 10%

c) 20%

d) 25%

7 / 30

7. A communicable disease is

a) cancer

b) fluorosis

c) tuberculosis

d) goitre

8 / 30

8. Turbidity for domestic water is undesirable because it

a) is unaesthetic

b) causes change of taste

c) gives apparent colour

d) none of the above

9 / 30

9. Traddle pump is operated by

a) hand

b) foot

c) electric

d) all of the above

10 / 30

10. 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

11 / 30

11. The working chamber of a manhole, along the direction of flow should have a minimum length for depth more than 0.8m:

a) 0.6 m

b) 0.9 m

c) 1.2 m

d) 2.4 m

12 / 30

12. 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

13 / 30

13. A lamp hole is helpful in:

a) illuminating sewer line

b) cleaning sewer line

c) repairing

d) testing sewers

14 / 30

14. Physical characteristics of sewage include:

a) Turbidity

b) Color

c) Odor

d) All of the above

15 / 30

15. Goaty water refers to...

a) odour of water

b) turbidity of water

c) colour of water

d) all of the above

16 / 30

16. 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

17 / 30

17. The aquifer having the least water-bearing capacity is

a) confined

b) unconfined

c) perched

d) none of the above

18 / 30

18. A flight sewer is provided when the gradient is:

a) low

b) steep

c) maximum (i.e., vertical)

d) zero

19 / 30

19. 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

20 / 30

20. Water horsepower of a pump is given by

a) WHQ / 75

b) WHQ / 360

c) WHQ / 220

d) WHQ / 85

21 / 30

21. If in the relative stability test on sewage, the period of incubation at 20°C is 15 days, the relative stability is:

a) 95.95%

b) 96.05%

c) 96.86%

d) 100%

22 / 30

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

a) water test

b) air test

c) compaction test

d) smoke test

23 / 30

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

a) perennial river

b) impounded reservoir

c) deep well

d) elevated lake

24 / 30

24. In the one-pipe system of plumbing, the number of vertical pipes is:

a) 1

b) 2

c) 3

d) 4

25 / 30

25. 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

26 / 30

26. The water supply pipeline should be tested at a specified pressure for

a) one hour

b) two hours

c) three hours

d) four hours

27 / 30

27. 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

28 / 30

28. Absolutely soft waters are required for

a) drinking

b) boilers

c) prevention of corrosion in pipes

d) washing with synthetic detergent soap

29 / 30

29. 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

30 / 30

30. Aeration of water is done to

a) remove carbon dioxide and taste in water

b) remove taste and odour in water

c) increase the quantity of oxygen in water

d) all of the above

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