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. Lead in water causes

a) plumbo solvency

b) stains on clothes and paper

c) damages water systems

d) permanent bluish skin

2 / 50

2. 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

3 / 50

3. 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

4 / 50

4. Septic tank is provided for:

a) To eliminate the sewer system

b) Tank for sedimentation cum disposal under aerobic conditions

c) Oxygen-free sedimentation cum disposal under anaerobic conditions

d) None of the above

5 / 50

5. If the head of water is more than 100 m then the type of pipe used is

a) plastic

b) HDP

c) GI

d) PVC

6 / 50

6. The quantity of flushing water required for pour-flush water seal latrine is:

a) 0.5-1.5 litres

b) 1.5-2.0 litres

c) 2.0-3.0 litres

d) 3.0-4.0 litres

7 / 50

7. 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

8 / 50

8. If 10 ml of raw sewage is diluted to 250 ml, and the dissolved oxygen content of the diluted sample changes from 9 mg/l to 5 mg/l after incubation at 20°C. for 5 days, BODs of raw sewage is:

a) 0.16 mg/l

b) 4 mg/l

c) 10 mg/l

d) 100 mg/l

9 / 50

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

a) stronger

b) heavier

c) costlier

d) all of the above

10 / 50

10. PVC pipes can withstand pressure up to

a) 20 m head of water

b) 50 m head of water

c) 100 m head of water

d) 150 m head of water

11 / 50

11. The amount of BOD in domestic water should be

a) 1 ppm

b) 2 ppm

c) 3 ppm

d) nil

12 / 50

12. 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

13 / 50

13. Turbidity depends on the presence of the following in water

a) suspended solids

b) suspended solids and colloidal solids

c) any material capable of preventing light

d) intensity of coloration

14 / 50

14. 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

15 / 50

15. 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

16 / 50

16. Corrosion of well pipes can be reduced by:

a) using thicker pipes

b) reducing the flow velocity

c) reducing the draw dawn

d) all of the above

17 / 50

17. Harmful bacteria are called:

a) Parasites

b) Anaerobic bacteria

c) Aerobic bacteria

d) Pathogens

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. 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

20 / 50

20. 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

21 / 50

21. 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

22 / 50

22. The inlet and outlet pipes of the septic tank are bent:

a) upward

b) downward

c) inlet upward and outlet downward

d) inlet downward and outlet upward

23 / 50

23. Anti-siphonage pipe is connected to:

a) Top of PWC

b) Bottom of PWC

c) In the main pipe

d) None of the above

24 / 50

24. Booster pump is used for

a) water supply

b) sewage pumping

c) pressure increase

d) drinking purposes

25 / 50

25. Turbidity is undesirable because it

a) renders waters unpalatable

b) affects photosynthesis of aquatic life

c) causes milky unite coloration to water

d) causes red and brown stains

26 / 50

26. The type of joint used in HDP pipe is

a) butt welding

b) solvent welding

c) thread joint

d) dresser coupling joint

27 / 50

27. 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

28 / 50

28. Sickness of tube well indicates

a) increase in well

b) reduction in yield

c) suffering from waterborne disease

d) all of the above

29 / 50

29. The valve provided on the suction pipe in a tube-well is

a) air relief valve

b) reflux valve

c) pressure

d) sluice valve

30 / 50

30. Gravity conduits

a) carry water under gravity

b) follow the hydraulic gradient line

c) are carried through tunnels in deep cutting

d) all of the above

31 / 50

31. A heavy metal having non-toxic property

a) lead

b) copper

c) zinc

d) silver

32 / 50

32. Turbidity of water is measured in

a) mg/1

b) Nephelometric Turbidity Unit (NTU)

c) potassium chloroplatinate units

d) threshold number

33 / 50

33. Treatment of sewage of small estates and colonies is done by:

a) aerated lagoon

b) oxidation pond

c) oxidation ditch

d) all of the above

34 / 50

34. The pattern of sanitation most suitable for a sloppy area is:

a) zone pattern

b) fan pattern

c) radial pattern

d) perpendicular pattern

35 / 50

35. The highest non-scouring velocity in a sewer may be allowed in:

a) cast iron sewer

b) glazed brick sewer

c) cement concrete

d) stone ware sewer

36 / 50

36. Groundwater from artesian wells

a) contains no suspended materials

b) contains dissolved salts

c) requires less treatment

d) all of the above

37 / 50

37. 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

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. The alum, when mixed with water as a coagulant...... PH value of water.

a) decreases

b) increases

c) no change

d) none of the above

40 / 50

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

a) more depth

b) less depth

c) more discharge

d) less discharge

41 / 50

41. The per capita consumption of a locality is affected by

a) climatic condition

b) quality of water

c) distribution pressure

d) all of the above

42 / 50

42. Minimum depth of infiltration gallery is

a) 2 m

b) 3 m

c) 4 m

d) 5 m

43 / 50

43. Gastrointestinal irritation is produced because of excess of the following in water

a) chlorides

b) sulphates

c) nitrates

d) phosphates

44 / 50

44. Manhole is said to be deep if its depth is more than:

a) 1.5 m

b) 1.70 m

c) 1.9 m

d) 2.1 m

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. The specific retention is least in the soil type

a) coarse gravel

b) sand

c) clay

d) silt

47 / 50

47. In a circular sewer if depth of flow is 0.2 times the full depth, the nominal gradient:

a) is only provided

b) is doubled

c) three

d) none of the above

48 / 50

48. Pump efficiency is 85%, motor efficiency is 94% then the combined efficiency of the two is

a) 90%

b) 80%

c) 70%

d) 85%

49 / 50

49. 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

50 / 50

50. Iron and manganese are estimated by

a) jar test

b) winkler test

c) calorimetric test

d) none of the above

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