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 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

2 / 50

2. 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

3 / 50

3. 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

4 / 50

4. 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

5 / 50

5. 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

6 / 50

6. The open channels supported above the ground over trestles are called

a) tunnel

b) aqueduct

c) flume

d) conduit

7 / 50

7. 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

8 / 50

8. The minimum water flow in a tap stand is:

a) 0.25 lps

b) 0.20 lps

c) 0.15 lps

d) 0.10 lps

9 / 50

9. 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

10 / 50

10. Grit is:

a) inert matter of specific gravity > 2.65

b) organic matter of specific gravity nearer to 1

c) organic and inert matter combined

d) colloidal matter of heavy specific gravity

11 / 50

11. The coverage of water supply in Nepal as per the census of 2011 is

a) 90%

b) 75%

c) 85%

d) 70%

12 / 50

12. Aqueducts are generally not designed in

a) circular section

b) rectangular section

c) horse-shoe section

d) vee section

13 / 50

13. Abbreviation which is correct?

a) TOC (Total Organic Carbon)

b) ThOD (Theoretical Oxygen Demand)

c) TOD (Total Oxygen Demand)

d) all of the above

14 / 50

14. Nahni trap is made of:

a) mud

b) cast iron

c) steel

d) all of the above

15 / 50

15. 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

16 / 50

16. Steel pipes are

a) generally laid underground and no expansion joint is required

b) connected by riveted or welded joints

c) suitable for withstanding high internal pressure

d) all of the above

17 / 50

17. The presence of hydrogen sulfide in water causes:

a) softening

b) acidity

c) alkalinity

d) bad taste

18 / 50

18. The types of sewer suitable for a separate system where discharge is uniform are:

a) egg-shaped

b) horse-shoe

c) circular

d) elliptical

19 / 50

19. Rotary pumps are suited for

a) small discharge

b) large discharge

c) high head

d) none of the above

20 / 50

20. The SODIS method of water purification is a process of:

a) Chlorination

b) Solar disinfection

c) System of disinfected integral supply

d) Supply of disinfected and improved water system

21 / 50

21. The water supply system whose main, sub-main, and branches are interconnected with each other is:

a) dead-end system

b) grid iron system

c) ring system

d) radial system

22 / 50

22. 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

23 / 50

23. Following material is used during drilling to prevent caving

a) bentonite

b) thixotropy

c) both (a) and (b) above

d) none of the above

24 / 50

24. Incrustation of well pipes can be reduced by:

a) using a screen having a larger area of opening

b) using acid-resistant material screen

c) removing the incrusted deposit

d) reducing the pumping rate

25 / 50

25. True colour of water is due to

a) suspended solids

b) colloidal solids

c) volatile solids

d) acids in solution

26 / 50

26. Sewage is treated by aerobic bacteria action in:

a) septic tank

b) settling tank

c) trickling filter

d) oxidation pond

27 / 50

27. 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

28 / 50

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

a) one hour

b) two hours

c) three hours

d) four hours

29 / 50

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

a) HDPE pipes

b) GI pipes

c) PVC pipes

d) CI pipes

30 / 50

30. The distribution mains in a water supply system are designed for

a) maximum daily demand

b) peak hourly demand

c) average daily demand

d) maximum hourly demand on the maximum consumption day

31 / 50

31. Digesters are used for:

a) the sludge digestion under optimum conditions

b) the sludge digestion under normal conditions

c) the sludge digestion under extreme conditions

d) none of the above

32 / 50

32. With the increase in the size of the water pipe, the permissible velocity (If discharge is constant)

a) decreases

b) increases

c) remains constant

d) none of the above

33 / 50

33. An aquiclude is

a) a non-artesian aquifer

b) a large underground water body

c) a confined bed of impervious material between aquifers

d) an artesian aquifer

34 / 50

34. Anti-siphonage pipe is connected to:

a) Top of PWC

b) Bottom of PWC

c) In the main pipe

d) None of the above

35 / 50

35. Choose the odd statement:

a) sewage is received in a wet well

b) sewage is received in a dry well

c) both of the above

d) none of the above

36 / 50

36. 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

37 / 50

37. Pipes for water supply are tested for

a) pressure

b) leakage

c) dimensions

d) all of the above

38 / 50

38. 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

39 / 50

39. A goose neck is:

a) a bent flexible pipe between ferrule and stop cock

b) a T-shaped brass between ferrule and water meter

c) a straight G.I. pipe between the service pipe and stop cock

d) a bent rigid pipe between the service pipe and water meter

40 / 50

40. Letache is observed in:

a) septic tank

b) sewage

c) landfill

d) none of the above

41 / 50

41. A communicable disease is

a) cancer

b) fluorosis

c) tuberculosis

d) goitre

42 / 50

42. As compared to shallow tube wells, deep wells have

a) more depth

b) less depth

c) more discharge

d) less discharge

43 / 50

43. 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

44 / 50

44. The most commonly used coagulant is:

a) Alum

b) Lime

c) Chlorine

d) Bleaching powder

45 / 50

45. The last trap provided in a house drainage system is:

a) q-trap

b) floor trap

c) nahni trap

d) interception trap

46 / 50

46. Growth of the population can be conveniently represented by

a) arithmetical curve

b) geographical curve

c) logistic curve

d) straight line curve

47 / 50

47. R.M.O. means

a) running

b) maintenance

c) operation

d) all of the above

48 / 50

48. The types of sanitation in which urine and soil are separated are:

a) VIP latrine

b) septic tank

c) aqua privy

d) ecosanitation

49 / 50

49. Sterilized water is generally used for

a) domestic

b) medical

c) public

d) all of the above

50 / 50

50. Water demand of a city includes

a) domestic water demand

b) commercial and industrial demand

c) fire and public-use demand

d) all of the above

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