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 flow in the sewers is minimum during which hours?

a) Night

b) Morning

c) Day

d) Evening

2 / 30

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

a) zinc

b) lead

c) silver

d) aluminum

3 / 30

3. 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

4 / 30

4. The standard BOD at 20°C is taken for the consumption in:

a) 20 days

b) 15 days

c) 10 days

d) 5 days

5 / 30

5. Computation of discharges is difficult for:

a) dead-end system

b) grid iron system

c) ring system

d) radial system

6 / 30

6. The most commonly used coagulant is:

a) Alum

b) Lime

c) Chlorine

d) Bleaching powder

7 / 30

7. The hourly variation factor is generally taken

a) 1.2

b) 1.5

c) 1.8

d) 2.3

8 / 30

8. Groundwater from artesian wells

a) contains no suspended materials

b) contains dissolved salts

c) requires less treatment

d) all of the above

9 / 30

9. 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

10 / 30

10. "Puits developee" is generally provided in case of

a) well

b) tube well

c) reservoir

d) none of the above

11 / 30

11. 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%

12 / 30

12. For a 150mm diameter sewer, the gradient required to generate self-cleaning velocity is:

a) 1 in 10

b) 1 in 100

c) 1 in 200

d) 1 in 300

13 / 30

13. The location of a well is considered good if it is sunk into

a) coarse gravel

b) silt

c) sand

d) clay

14 / 30

14. The valve provided at low points of the pipe to drain off water quickly under gravity is

a) drain valve

b) blow-off valve

c) sewer valve

d) all of the above

15 / 30

15. Grade aqueducts are not allowed to run

a) one-fourth full

b) half

c) three

d) full

16 / 30

16. The velocity of water in water mains of 40 cm diameter is usually kept

a) below 0.5 m/sec

b) below 5 m/sec

c) below 1.8 m/sec

d) below 18 m/sec

17 / 30

17. Dug wells or open wells

a) have a diameter between 1 to 4m

b) are suitable for a small discharge of about 20cum/hour

c) are cheap in construction

d) all of the above

18 / 30

18. A sewer, which receives the discharge of a number of house sewers, is called:

a) house sewer

b) lateral sewer

c) intercepting sewer

d) sub-main sewer

19 / 30

19. The types of sewer suitable for a separate system where discharge is uniform are:

a) egg-shaped

b) horse-shoe

c) circular

d) elliptical

20 / 30

20. The sewer meant to carry excess discharge from an existing sewer is called:

a) main sewer

b) trunk sewer

c) outfall sewer

d) relief sewer

21 / 30

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

a) 1.2

b) 1.5

c) 1.8

d) 2.7

22 / 30

22. Air inlet valve is provided in water mains at

a) summit of the pipe

b) downstream of the sluice valve

c) both (a) and (b) of the above

d) upstream of the sluice valve

23 / 30

23. The coverage of water supply in Nepal as per the census of 2011 is

a) 90%

b) 75%

c) 85%

d) 70%

24 / 30

24. Decrease in per capita consumption occurs by

a) use of a metering system

b) hot climate

c) good-quality water is supplied

d) all of the above

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 ratio of maximum hourly consumption and average hourly consumption of the maximum day is

a) 1.2

b) 1.5

c) 1.8

d) 2.7

27 / 30

27. Advantage of pressure conduits is

a) flow is independent of the grade of the hydraulic grade line

b) economical since it follows a shorter path

c) less chance of water pollution as it is closed

d) all of the above

28 / 30

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

a) one hour

b) two hours

c) three hours

d) four hours

29 / 30

29. The water which is not chemically pure but does not contain anything harmful to human health is known as

a) pure water

b) wholesome water

c) polluted water

d) none of the water

30 / 30

30. According to the guidelines of DWSS, the maximum number of users in each stand post should be:

a) 50

b) 100

c) 150

d) 200

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Water Supply & Sanitation Engineering Online Test – Paper 2

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