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. At the socket and spigot joint,

a) the enlarged end of the pipe is called a socket

b) the normal end of the pipe is called a spigot

c) the spigot is fitted into the socket

d) all of the above

2 / 30

2. 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

3 / 30

3. Which one is correct?

a) Baylis turbidity meter is used to measure turbidity 0-20 PPM

b) Hellige turbidity meter is used to measure turbidity 0-50 PPM

c) Jackson turbidity meter is used to measure turbidity 50-1000 PPM

d) all of the above

4 / 30

4. The detention time in a septic tank is usually:

a) 1-2 hours

b) 5-6 hours

c) 18-24 hours

d) 22-24 hours

5 / 30

5. The capacity of a flushing cistern for water closets is:

a) 1-2 liters

b) 10-15 liters

c) 5 liters

d) 20-25 liters

6 / 30

6. A wrong nominal internal diameter in mm for a cast iron (spun) pipe is

a) 300

b) 400

c) 500

d) 550

7 / 30

7. From the septic tank, the effluents are discharged into:

a) drainage

b) soak pit

c) sewer

d) none of the above

8 / 30

8. In Chezy's formula v=c√ms for calculating the velocity of flow in a circular sewer, the Chezy's constant c depends upon:

a) size of the sewer

b) shape of the sewer

c) roughness of the sewer

d) all of the above

9 / 30

9. A source of colour in water is due to

a) silt

b) clay

c) organic debris

d) inorganic inert matter

10 / 30

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

a) Privy pit

b) Cesspool

c) Soak pit

d) None of the above

11 / 30

11. The types of pipe which are generally laid vertically due to low strength is

a) copper

b) concrete

c) asbestos cement

d) cast iron

12 / 30

12. The type of joint generally used in cast-iron pipes is

a) flanged joint

b) socket and spigot joint

c) dresser coupling joint

d) all of the above

13 / 30

13. Time of concentration depends upon:

a) slope of the catchment

b) intensity of rainfall

c) nature of soil

d) all of the above

14 / 30

14. Septic tank effluent is:

a) quite clear and sparkling

b) always odorless

c) having fine organic solids with high BOD

d) black tarry liquor with an earthy odor

15 / 30

15. The type of joint used in plastic pipe is

a) butt welding

b) solvent welding

c) thread joint

d) dresser coupling joint

16 / 30

16. Scour valves are provided

a) at every summit of rising mains

b) at very depression and dead ends to drain out the waste water that may collect there

c) at street corners to control the flow of water

d) all of the above

17 / 30

17. The main 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

18 / 30

18. In strainer type wells

a) the flow is radial

b) the flow is spherical

c) area of flow depends upon the size of the cavity

d) all of the above

19 / 30

19. Letache is observed in:

a) septic tank

b) sewage

c) landfill

d) none of the above

20 / 30

20. Fluoridation is done to

a) protect children's teeth

b) protect from dental fluorosis

c) protect from both dental and skeletal fluorosis

d) add taste to water

21 / 30

21. The characteristics of fresh and septic sewage are:

a) alkaline and acidic

b) acidic and alkaline

c) acidic and acidic

d) alkaline and alkaline

22 / 30

22. Inverted siphon is called:

a) depressed sewer

b) sag sewer

c) both of the above

d) none of the above

23 / 30

23. 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

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. To compensate for losses, thefts, and wastage of water, an allowance made of (as per NWSC)

a) 5%

b) 10%

c) 15%

d) 35%

26 / 30

26. The interference of the well depends upon

a) the number of wells

b) spacing between wells

c) types of wells

d) all of the above

27 / 30

27. Which traps have parallel legs?

a) P-Trap

b) Q-Trap

c) gully trap

d) S-Trap

28 / 30

28. As compared to cast iron pipes, steel pipes are

a) stronger

b) heavier

c) costlier

d) all of the above

29 / 30

29. Inverted siphon is made of:

a) one pipe

b) two pipes

c) three pipes

d) four pipes

30 / 30

30. A manhole of such depth that an access shaft is required in addition to the working chamber, is called.....:

a) shallow manhole

b) medium manhole

c) deep manhole

d) none of the above

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