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 last trap provided in a house drainage system is:

a) q-trap

b) floor trap

c) nahni trap

d) interception trap

2 / 50

2. Septic tanks are best suited for:

a) municipalities

b) industries

c) scattered residences

d) congested areas

3 / 50

3. A communicable disease is

a) cancer

b) fluorosis

c) tuberculosis

d) goitre

4 / 50

4. Pipes for water supply are tested for

a) pressure

b) leakage

c) dimensions

d) all of the above

5 / 50

5. Most suitable section of sewer in a separate sewage system is:

a) circular section

b) rectangular section

c) egg-shaped section

d) modified egg-shaped section

6 / 50

6. 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

7 / 50

7. Thrust blocks are installed wherever there is a

a) change in the direction or size of the pipeline

b) change in the pressure line diagram

c) pipeline ends at a dead end

d) all of the above

8 / 50

8. A circular section for a sewer is preferred only up to a diameter of:

a) 10 cm

b) 20 cm

c) 30 cm

d) 60 cm

9 / 50

9. 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

10 / 50

10. When the limiting non-scouring velocity is 5 m/sec, the type of sewer generally used is:

a) stone ware sewer

b) cast iron sewer

c) brick sewer

d) glazed brick sewer

11 / 50

11. Stoneware pipes are generally not used for sewer mains because they are:

a) weak in compression

b) weak in tension

c) hydraulically less efficient

d) less resistant to organic corrosion

12 / 50

12. A sewer, which gets its flow from a number of transverse sewers, is known as:

a) interceptor

b) interconnector

c) head sewer

d) branch sewer

13 / 50

13. The hourly variation factor is generally taken

a) 1.2

b) 1.5

c) 1.8

d) 2.3

14 / 50

14. The relation between porosity, specific yield, and specific retention is given by

a) porosity = specific yield + specific retention

b) porosity = specific yield - specific retention

c) specific yield = porosity + specific retention

d) none of the above

15 / 50

15. Designation of GI pipe is done with:

a) internal diameter

b) external diameter

c) center line

d) none of the above

16 / 50

16. 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

17 / 50

17. Watershed control method is used to control

a) water in the pipeline

b) sedimentation in the reservoir

c) algae in the reservoir

d) bacteria in water

18 / 50

18. 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

19 / 50

19. Traddle pump is operated by

a) hand

b) foot

c) electric

d) all of the above

20 / 50

20. The maximum amount of copper in domestic water should be

a) up to 3 ppm

b) up to 15 ppm

c) up to 45 ppm

d) all of the above

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. Widely used pipe for rural water supply in Nepal is:

a) HDPE pipes

b) GI pipes

c) PVC pipes

d) CI pipes

23 / 50

23. Coefficient of permeability is maximum for

a) clean gravel

b) clay

c) fine sand

d) silt

24 / 50

24. Sewage is treated by aerobic bacteria action in:

a) septic tank

b) settling tank

c) trickling filter

d) oxidation pond

25 / 50

25. Time of concentration depends upon:

a) slope of the catchment

b) intensity of rainfall

c) nature of soil

d) all of the above

26 / 50

26. Inverted siphon is made of:

a) one pipe

b) two pipes

c) three pipes

d) four pipes

27 / 50

27. PH value is a symbol for....material:

a) hydrogen

b) magnesium

c) calcium

d) sodium

28 / 50

28. 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

29 / 50

29. Total quantity of reservoir is the sum of the following

a) breakdown reserve

b) fire reserve

c) all of the above

d) balancing reserve

30 / 50

30. Find the BOD with the following data: initial oxygen = 9 PPM, final oxygen = 4 PPM sewage sample 200 ml and diluted sewage = 4 ppm.

a) 180 PPM

b) 320 PPM

c) 200 PPM

d) 250 PPM

31 / 50

31. Sewer has to bear:

a) internal pressure of sewage

b) temperature stresses

c) forces due to external loads

d) all of the above

32 / 50

32. Aeration of water is done by

a) spray nozzles

b) cascading

c) trickling bed

d) all of the above

33 / 50

33. B-coli tests are conducted to serve as a

a) very good indicator of pathogenic bacteria

b) very good indicator of acidity

c) very good indicator of alkalinity

d) means of detecting turbidity

34 / 50

34. Priming is the process of

a) removing the trapped air from the pump

b) removing the trapped water from the pump

c) removing the debris waste from the pump

d) all of the above

35 / 50

35. In the one-pipe system of plumbing, the number of vertical pipes is:

a) 1

b) 2

c) 3

d) 4

36 / 50

36. Merit of water carriage sewage system:

a) no human agency is involved in this system

b) no problem of foul smell or hygienic trouble

c) less area is required

d) all of the above

37 / 50

37. Where manholes shall be installed in a sewer system?

a) At the middle of each line

b) At all intersections, changes in grade, size, alignment

c) At ends of a curvilinear sewer

d) At distances not greater than 50m

38 / 50

38. Goaty water refers to...

a) odour of water

b) turbidity of water

c) colour of water

d) all of the above

39 / 50

39. Inverted siphon is called:

a) depressed sewer

b) sag sewer

c) both of the above

d) none of the above

40 / 50

40. As the diameter of the sewer increases, the self-cleaning velocity:

a) increases

b) decreases

c) remains constant

d) depends on other factors

41 / 50

41. Manhole is said to be shallow if its depth is less than:

a) 0.7-0.9 m

b) 1.0-1.2 m

c) 0.8 m

d) 0.7 m

42 / 50

42. 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

43 / 50

43. The color of septic sewage is:

a) grey

b) black

c) white

d) blue

44 / 50

44. Per capita water demand is calculated in liters

a) per person per day

b) per person per month

c) per person per year

d) none of the above

45 / 50

45. Following material is used during drilling to prevent caving

a) bentonite

b) thixotropy

c) both (a) and (b) above

d) none of the above

46 / 50

46. Letache is observed in:

a) septic tank

b) sewage

c) landfill

d) none of the above

47 / 50

47. Pressure relief valve is provided to prevent

a) the increase of pressure after a certain limit

b) back flow when the pump is stopped

c) the water flowing out of the suction pipe

d) none of the above

48 / 50

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

a) drainage

b) soak pit

c) sewer

d) none of the above

49 / 50

49. The factor to be considered for the source of water supply is:

a) quantity and quality of available water

b) elevation of the sources of water

c) general terrain intervening the area

d) all of the above

50 / 50

50. If in the relative stability test on sewage, the period of incubation at 20°C is 15 days, the relative stability is:

a) 95.95%

b) 96.05%

c) 96.86%

d) 100%

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