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 object of cowl is to:

a) give an ornamental look

b) prevent the entry of rainfall into the waste pipe

c) quickly dispel foul gases

d) prevent nest building

2 / 30

2. If P is the total internal pressure, d is the diameter of the pressure conduit, and t is the thickness of the conduit, the hoop's stress is

a) d.p / 2t

b) d.p / t

c) d.t / 2p

d) d.t / p

3 / 30

3. 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

4 / 30

4. Which type of distribution system will you follow if the reduced level of the source of water is 100 m while the reduced level of the town is 50 m?

a) gravity system

b) pumping system

c) dual system

d) none of the above

5 / 30

5. PH value of water for water supply

a) 6.5 to 8.5

b) 5.5 to 7.0

c) 7.0 to 9.5

d) 5.5 to 9.5

6 / 30

6. Septic tanks are best suited for:

a) municipalities

b) industries

c) scattered residences

d) congested areas

7 / 30

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

a) Privy pit

b) Cesspool

c) Soak pit

d) None of the above

8 / 30

8. The bacteria which can survive with or without oxygen is known as...

a) aerobic bacteria

b) anaerobic bacteria

c) facultative bacteria

d) none of the above

9 / 30

9. Grit obtained in a grit chamber is used for:

a) as a manure

b) as a soil conditioner

c) as a coarse aggregate

d) as a substitute for sand

10 / 30

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

a) drainage

b) soak pit

c) sewer

d) none of the above

11 / 30

11. 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

12 / 30

12. 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

13 / 30

13. 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

14 / 30

14. If you have to design a simple water filtration unit for a community water supply system in Biratnagar, which type of filter will you choose in general?

a) slow sand filter

b) rapid sand filter

c) trickling filter

d) pressure filter

15 / 30

15. Grade aqueducts are not allowed to run

a) one-fourth full

b) half

c) three

d) full

16 / 30

16. The water carriage sewage system:

a) is cheaper in initial cost than dry conveyance system

b) requires treatment before disposal

c) creates a hygienic problem

d) all of the above

17 / 30

17. Manhole is said to be medium if its depth is between:

a) 0.7-0.9 m

b) 0.9-1.2 m

c) 0.9-1.3 m

d) 0.9-1.5 m

18 / 30

18. The difference between a septic tank and an imhoff tank is that in an imhoff tank:

a) digestion takes place in a different compartment

b) it is suitable for serving a much bigger population

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

d) none of the above

19 / 30

19. The process of obtaining energy for their (bacteria) synthesis after the oxidation of organic or inorganic matter is called

a) photosynthesis

b) chemosynthesis

c) both

d) none

20 / 30

20. Lead in water causes

a) plumbo solvency

b) stains on clothes and paper

c) damages water systems

d) permanent bluish skin

21 / 30

21. 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

22 / 30

22. Computation of discharges is difficult for:

a) dead-end system

b) grid iron system

c) ring system

d) radial system

23 / 30

23. Sewage is treated by aerobic bacteria action in:

a) septic tank

b) settling tank

c) trickling filter

d) oxidation pond

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 determine the velocity of the flow of underground water, the most commonly used non-empirical formula is....formula:

a) Darcy's

b) Slitcher's

c) Hazen's

d) Lacy's

26 / 30

26. Absolutely soft waters are required for

a) drinking

b) boilers

c) prevention of corrosion in pipes

d) washing with synthetic detergent soap

27 / 30

27. A complete water supply system includes:

a) construction of intake and collection chamber

b) digging of a well for water

c) construction of a dam for a reservoir

d) the entire arrangement from source to distribution

28 / 30

28. Sewerage system is designed for:

a) maximum flow only

b) minimum flow only

c) average flow only

d) maximum and minimum flow

29 / 30

29. The most commonly used coagulant is:

a) Alum

b) Lime

c) Chlorine

d) Bleaching powder

30 / 30

30. 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

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