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. 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 ratio of maximum to average sewage flow for mains up to 1 m in diameter is usually:

a) 1.0

b) 1.2

c) 1.5

d) 2.0

3 / 30

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

a) High-level alarm

b) Check valve

c) Union

d) Pump lift chain

4 / 30

4. The per capita consumption of a locality is affected by

a) climatic condition

b) quality of water

c) distribution pressure

d) all of the above

5 / 30

5. The maximum amount of copper in domestic water should be

a) up to 3 ppm

b) up to 15 ppm

c) up to 45 ppm

d) all of the above

6 / 30

6. Asbestos pipes are joined by means of

a) flanged joint

b) flexible joint

c) simplex joint

d) dresser coupling joint

7 / 30

7. 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

8 / 30

8. 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

9 / 30

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

a) 5 m

b) 10 m

c) 15 m

d) 20 m

10 / 30

10. 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

11 / 30

11. Before entering a manhole, a candle is lowered into the manhole:

a) to illuminate it

b) to detect toxic gases

c) to give a signal to the adjacent manhole

d) to find out the presence of oxygen

12 / 30

12. 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

13 / 30

13. Iron and manganese are estimated by

a) jar test

b) winkler test

c) calorimetric test

d) none of the above

14 / 30

14. The common pipe used in house plumbing is:

a) PVC

b) HDPE

c) GI

d) CI

15 / 30

15. Which traps have perpendicular legs?

a) P-Trap

b) Q-Trap

c) gully trap

d) S-Trap

16 / 30

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

a) 100 cm

b) 200 cm

c) 300 cm

d) 450 cm

17 / 30

17. A G.I. pipe has a coating of

a) zinc

b) lead

c) silver

d) aluminum

18 / 30

18. Surface water is obtained from

a) well

b) spring

c) artesian well

d) rain

19 / 30

19. The average discharge of a tube-well is about

a) 5 liters/sec

b) 50 liters/sec

c) 100 liters/sec

d) 500 liters/sec

20 / 30

20. 2 ml of sewage, having BOD-500 mg/l, is diluted to 200 ml, and incubated for 5 days at 20°C. If the D.O. content after 5 days is found to be 5 mg/l, what was the initial D.O. content of the diluted sample?

a) 10 mg/l

b) 5 mg/l

c) 1 mg/l

d) none of the above

21 / 30

21. 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

22 / 30

22. 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

23 / 30

23. 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

24 / 30

24. Physical characteristics of sewage include:

a) Turbidity

b) Color

c) Odor

d) All of the above

25 / 30

25. By boiling water, hardness can be removed if it is due to:

a) Calcium sulphate

b) Magnesium sulphate

c) Calcium nitrate

d) Calcium bicarbonate

26 / 30

26. Manholes on sewer lines are provided for:

a) periodic cleaning

b) providing air for oxidation

c) removal of part of sewerage

d) all of the above

27 / 30

27. Gravity conduits are generally in the form of

a) open channels

b) conduits

c) tunnels

d) all of the above

28 / 30

28. Source of water in the mountains is:

a) tube well

b) well

c) stream

d) none of the above

29 / 30

29. What will be the daily per capita water demand for a city of 0.2 million people whose total water requirement per annum is 19,710,000 cubic meters?

a) 250 liters

b) 280 liters

c) 270 liters

d) 260 liters

30 / 30

30. The most suitable excreta disposal unit for human excreta is:

a) Privy pit

b) Cesspool

c) Soak pit

d) None of the above

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