Water Supply & Sanitation Engineering Online Test

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Vikash chaudhary

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Total Questions: 50
Time Allotted: 50 minutes
Passing Score: 70%
Randomization: Yes
Certificate: Yes
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1 / 50

1. The head developed in a centrifugal pump, at zero discharge is known as

a) low head

b) high head

c) medium head

d) shut off head

2 / 50

2. Pressure relief valve is provided in the water main

a) to reduce the pressure

b) upstream of the sluice

c) at the low point

d) all of the above

3 / 50

3. Iron in water causes

a) stains on clothes

b) eutrophication

c) rust

d) corrosion

4 / 50

4. The color of septic sewage is:

a) grey

b) black

c) white

d) blue

5 / 50

5. Source of water in the mountains is:

a) tube well

b) well

c) stream

d) none of the above

6 / 50

6. Designation of GI pipe is done with:

a) internal diameter

b) external diameter

c) center line

d) none of the above

7 / 50

7. Two sewer sections laid at the same grade will be hydraulically equivalent if:

a) their discharge capacity when running full is equal

b) their flow velocity when running full is equal

c) their flowing areas when running full are equal

d) all the above factors are equal

8 / 50

8. 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

9 / 50

9. 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

10 / 50

10. Which traps have curved legs?

a) P-Trap

b) Q-Trap

c) gully trap

d) S-Trap

11 / 50

11. Size of colloidal particles present in water is

a) 10 to 10^-1 mm

b) 10^-1 to 10^-3 mm

c) 10^-3 to 10^-6 mm

d) 10^-6 to 10^-9 mm

12 / 50

12. When the fall in elevation is greater than 60cm, the manhole provided is called:

a) lamp hole

b) flight manhole

c) drop manhole

d) fall manhole

13 / 50

13. The specific gravity of sewage is:

a) equal to 1

b) slightly less than 1

c) slightly more than 1

d) none of the above

14 / 50

14. Anti-siphonage pipe is connected to:

a) Top of PWC

b) Bottom of PWC

c) In the main pipe

d) None of the above

15 / 50

15. The diameter of pipes in bathrooms and lavatories in domestic water supply is:

a) 10 mm

b) 12 mm

c) 16 mm

d) 20 mm

16 / 50

16. The layout of the distribution system that is suitable for haphazardly growing cities is:

a) dead-end system

b) grid iron system

c) ring system

d) radial system

17 / 50

17. The term "septic" refers to.....?

a) Anaerobic bacterial environment that develops in the tank

b) Refers to safety and precaution

c) Drainage of waste materials

d) Aerobic bacterial environment that develops in the tank

18 / 50

18. 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

19 / 50

19. Pick up the correct statement:

a) If PH<7 then sewage is acidic

b) If PH>7 then sewage is alkaline

c) If PH=7 the sewage is neutral

d) all of the above

20 / 50

20. The hourly variation factor is generally taken

a) 1.2

b) 1.5

c) 1.8

d) 2.3

21 / 50

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

a) one hour

b) two hours

c) three hours

d) four hours

22 / 50

22. 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

23 / 50

23. An egg-shaped section of sewer:

a) is economical than a circular section

b) is more stable than a circular section

c) provides self-cleansing velocity at low discharge

d) all of the above

24 / 50

24. Shrouding is the process of filling gravel, bajri, etc., in

a) slotted tube well

b) strainer tube well

c) perforated tube well

d) cavity tube well

25 / 50

25. The working conditions in imhoff tanks are:

a) aerobic only

b) anaerobic only

c) aerobic in the lower and anaerobic in the upper compartment

d) anaerobic in the lower and aerobic in the upper compartment

26 / 50

26. Pipes for water supply are tested for

a) pressure

b) leakage

c) dimensions

d) all of the above

27 / 50

27. The asbestos cement pipes are generally laid

a) horizontally

b) vertically

c) in any position

d) inclined at 60°

28 / 50

28. Service connections to consumer houses are generally provided with

a) copper pipes

b) PVC pipes

c) galvanized pipes

d) cast iron pipes

29 / 50

29. Thrash rack/roughing filter is provided at the entrance of

a) intake

b) slow sand filter

c) rapid sand filter

d) all of the above

30 / 50

30. Sewerage system is designed for:

a) maximum flow only

b) minimum flow only

c) average flow only

d) maximum and minimum flow

31 / 50

31. GI pipe coming from both sides is joined with a fitting called:

a) Tee

b) Union

c) Elbow

d) Socket

32 / 50

32. Sterilization is the process of

a) killing of diseases bacteria

b) produce of diseases of water

c) no change diseases bacteria

d) eliminating all life

33 / 50

33. 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

34 / 50

34. Poppet valve is a type of

a) air valve

b) blow-off valve

c) sluice valve

d) none of the above

35 / 50

35. Laying of a sewer is generally done with the help of:

a) sight rails and boning rod

b) theodolite and staff

c) leveling and staff

d) all of the above

36 / 50

36. It is practical to design sewer for the self-cleaning velocity at:

a) Ultimate peak flow

b) Maximum flow

c) Minimum flow

d) Extra flow

37 / 50

37. The odour of water can be determined by...

a) microscope

b) telescope

c) sonoscope

d) osmoscope

38 / 50

38. 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

39 / 50

39. 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

40 / 50

40. Goitre is due to

a) chlorine

b) bromine

c) iodine

d) all of the above

41 / 50

41. The sewage in an inverted siphon will flow under what condition?

a) Air

b) Vacuum

c) Pressure

d) Gravity

42 / 50

42. During the water test of sewer, 2 lit/cm of dia/km of sewer line may be allowed for a period of:

a) 5 minutes

b) 30 minutes

c) 15 minutes

d) 20 minutes

43 / 50

43. 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

44 / 50

44. The aquifer having the least water-bearing capacity is

a) confined

b) unconfined

c) perched

d) none of the above

45 / 50

45. 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

46 / 50

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

a) well

b) tube well

c) reservoir

d) none of the above

47 / 50

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

a) Darcy's formula

b) Slitcher's formula

c) Hazen's formula

d) Lacy's formula

48 / 50

48. In water analysis, the test carried out is

a) physical

b) chemical

c) biological

d) all of the above

49 / 50

49. The minimum size of a fire hydrant is:

a) 5 cm

b) 10 cm

c) 15 cm

d) 50 cm

50 / 50

50. Most suitable section, when the maximum and minimum flow ratio is not much, is:

a) circular section

b) rectangular section

c) horse-shoe section

d) egg-shaped section

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