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. Physical characteristics of sewage include:

a) Turbidity

b) Color

c) Odor

d) All of the above

2 / 30

2. 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

3 / 30

3. The common pipe used in house plumbing is:

a) PVC

b) HDPE

c) GI

d) CI

4 / 30

4. The amount of BOD in domestic water should be

a) 1 ppm

b) 2 ppm

c) 3 ppm

d) nil

5 / 30

5. If 10 ml of raw sewage is diluted to 250 ml, the dilution factor is:

a) 24

b) 25

c) 1/25

d) none of the above

6 / 30

6. Detention time for the detritus tank is:

a) 1-2 minutes

b) 2-3 minutes

c) 3-4 minutes

d) 4-5 minutes

7 / 30

7. 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

8 / 30

8. R.M.O. means

a) running

b) maintenance

c) operation

d) all of the above

9 / 30

9. Corrosion of well pipes can be reduced by:

a) using thicker pipes

b) reducing the flow velocity

c) reducing the draw dawn

d) all of the above

10 / 30

10. 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

11 / 30

11. 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

12 / 30

12. A tube well of 38cm diameter has depths before and after pumping at 10.7 m and 4.60, respectively. The coefficient of permeability is 2273 liters per day. If the radius of the circle of influence is 304.8m. The yield from the tube well will be

a) 500,00 liters per day

b) 600,00 liters per day

c) 750,00 liters per day

d) 900,00 liters per day

13 / 30

13. The types of diseases caused due to the lack of water are known as

a) waterborne

b) water-washed

c) water-based

d) water vector

14 / 30

14. True colour of water is due to

a) suspended solids

b) colloidal solids

c) volatile solids

d) acids in solution

15 / 30

15. The valve which allows water to flow in one direction but prevents its flow in the reverse direction is

a) reflux valve

b) gate valve

c) sluice valve

d) pressure valve

16 / 30

16. Infiltration gallery is a

a) horizontal well

b) vertical well

c) inclined well

d) none of the above

17 / 30

17. 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

18 / 30

18. The slope of the hydraulic grade line is always towards the well due to pumping. This line of depressed water table is called

a) drawdown curve

b) circle of influence

c) dynamic gradient

d) an inverted cone of depression

19 / 30

19. Asbestos pipes are

a) highly resistant to corrosion

b) light in weight and easy to transport

c) highly flexible to resist deflection up to 120

d) very smooth

20 / 30

20. Which traps have perpendicular legs?

a) P-Trap

b) Q-Trap

c) gully trap

d) S-Trap

21 / 30

21. The pressure at the inlet and outlet in a break pressure tank is

a) zero and 1 m

b) 1 m and zero

c) zero and zero

d) 1 m and 1 m

22 / 30

22. If 10 ml of raw sewage is diluted to 250 ml, and the dissolved oxygen content of the diluted sample changes from 9 mg/l to 5 mg/l after incubation at 20°C. for 5 days, BODs of raw sewage is:

a) 0.16 mg/l

b) 4 mg/l

c) 10 mg/l

d) 100 mg/l

23 / 30

23. Inverted siphon is made of:

a) one pipe

b) two pipes

c) three pipes

d) four pipes

24 / 30

24. A structure constructed to remove obstacles in the sewer is known as:

a) catch basin

b) well holes

c) clean outs

d) flushing tanks

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. "A right-angled sleeve (valve) connected in the water main through which water is tapped for domestic supply is called:

a) service pipe

b) goose neck

c) ferrule

d) stop tap

27 / 30

27. Depth of shallow tube well shall not be more than (considering economic point):

a) 30 m

b) 40 m

c) 50 m

d) 60 m

28 / 30

28. Booster pump is used for

a) water supply

b) sewage pumping

c) pressure increase

d) drinking purposes

29 / 30

29. Lead in water causes

a) plumbo solvency

b) stains on clothes and paper

c) damages water systems

d) permanent bluish skin

30 / 30

30. If the head of water is more than 100 m then the type of pipe used is

a) plastic

b) HDP

c) GI

d) PVC

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Water Supply & Sanitation Engineering Online Test – Paper 2

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