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. 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

2 / 30

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

a) one hour

b) two hours

c) three hours

d) four hours

3 / 30

3. The curve showing the level of water in a well and the original water table is known as

a) inverted cone of depression

b) drawdown curve

c) circle of influence

d) all of the above

4 / 30

4. A lamp hole is helpful in:

a) illuminating sewer line

b) cleaning sewer line

c) repairing

d) testing sewers

5 / 30

5. Pipes for water supply are tested for

a) pressure

b) leakage

c) dimensions

d) all of the above

6 / 30

6. Lead in water causes

a) plumbo solvency

b) stains on clothes and paper

c) damages water systems

d) permanent bluish skin

7 / 30

7. 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

8 / 30

8. The open channels supported above the ground over trestles are called

a) tunnel

b) aqueduct

c) flume

d) conduit

9 / 30

9. 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

10 / 30

10. Which traps have curved legs?

a) P-Trap

b) Q-Trap

c) gully trap

d) S-Trap

11 / 30

11. 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

12 / 30

12. The specific gravity of sewage is:

a) equal to 1

b) slightly less than 1

c) slightly more than 1

d) none of the above

13 / 30

13. True colour of water is due to

a) suspended solids

b) colloidal solids

c) volatile solids

d) acids in solution

14 / 30

14. Choose the odd statement:

a) sewage is received in a wet well

b) sewage is received in a dry well

c) both of the above

d) none 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. Which test is a must for a house sewer?

a) water test

b) air test

c) compaction test

d) smoke test

17 / 30

17. Gastrointestinal irritation is produced because of excess of the following in water

a) chlorides

b) sulphates

c) nitrates

d) phosphates

18 / 30

18. The alum, when mixed with water as a coagulant...... PH value of water.

a) decreases

b) increases

c) no change

d) none of the above

19 / 30

19. Grit is:

a) inert matter of specific gravity > 2.65

b) organic matter of specific gravity nearer to 1

c) organic and inert matter combined

d) colloidal matter of heavy specific gravity

20 / 30

20. Manhole is said to be shallow if its depth is less than:

a) 0.7-0.9 m

b) 1.0-1.2 m

c) 0.8 m

d) 0.7 m

21 / 30

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

a) 5 cm

b) 10 cm

c) 15 cm

d) 25 cm

22 / 30

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

a) expansion joints

b) contraction joints

c) anchorages

d) pressure relief valves

23 / 30

23. R.M.O. means

a) running

b) maintenance

c) operation

d) all of the above

24 / 30

24. 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

25 / 30

25. 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

26 / 30

26. The term "septic" refers to.....?

a) Anaerobic bacterial environment that develops in the tank

b) Refers to safety and precaution

c) Drainage of waste materials

d) Aerobic bacterial environment that develops in the tank

27 / 30

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

a) 1.2

b) 1.5

c) 1.8

d) 2.7

28 / 30

28. Rotary pumps are suited for

a) small discharge

b) large discharge

c) high head

d) none of the above

29 / 30

29. 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

30 / 30

30. 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

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