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. In the partially ventilated single-stack system of plumbing, the number of vertical pipes is:

a) 1

b) 2

c) 3

d) 4

2 / 50

2. Aeration of water is done to

a) remove carbon dioxide and taste in water

b) remove taste and odour in water

c) increase the quantity of oxygen in water

d) all of the above

3 / 50

3. 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

4 / 50

4. The water collected for the sample from the

a) 10-20 cm below from the surface

b) 20-30 cm below from the surface

c) 30-40 cm below from the surface

d) 40-50 cm below from the surface

5 / 50

5. The hourly variation factor is generally taken

a) 1.2

b) 1.5

c) 1.8

d) 2.3

6 / 50

6. A G.I. pipe has a coating of

a) zinc

b) lead

c) silver

d) aluminum

7 / 50

7. Excess concentration of sodium salts in water causes

a) hardness

b) bitter taste

c) alkalinity

d) laxative effect

8 / 50

8. The presence of hydrogen sulfide in water causes:

a) softening

b) acidity

c) alkalinity

d) bad taste

9 / 50

9. 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

10 / 50

10. Turbidity is measured on..........

a) standard silica scale

b) standard cobalt scale

c) diagonal scale

d) none of the above

11 / 50

11. Lead in water causes

a) plumbo solvency

b) stains on clothes and paper

c) damages water systems

d) permanent bluish skin

12 / 50

12. Detention time for the detritus tank is:

a) 1-2 minutes

b) 2-3 minutes

c) 3-4 minutes

d) 4-5 minutes

13 / 50

13. Odour is measured in terms of...

a) threshold number

b) reynold number

c) mach number

d) none of the above

14 / 50

14. Minimum depth of infiltration gallery is

a) 2 m

b) 3 m

c) 4 m

d) 5 m

15 / 50

15. 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

16 / 50

16. Methemoglobinemia (Blue babies) is due to

a) oxidation of hemoglobin

b) nitrates replacing oxygen in hemoglobin

c) nitrites replacing oxygen in hemoglobin

d) carbon monoxide replacing oxygen in hemoglobin

17 / 50

17. The pump does not require any power, energy, fuel, etc., for its working is

a) centrifugal

b) hydraulic ram

c) reciprocating

d) rotary

18 / 50

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

a) breakdown reserve

b) fire reserve

c) all of the above

d) balancing reserve

19 / 50

19. 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

20 / 50

20. Source of water in the mountains is:

a) tube well

b) well

c) stream

d) none of the above

21 / 50

21. Letache is observed in:

a) septic tank

b) sewage

c) landfill

d) none of the above

22 / 50

22. Aqueducts are generally not designed in

a) circular section

b) rectangular section

c) horse-shoe section

d) vee section

23 / 50

23. In the two-pipe system of plumbing, the number of vertical pipes is:

a) 1

b) 2

c) 3

d) 4

24 / 50

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

a) zone pattern

b) fan pattern

c) radial pattern

d) perpendicular pattern

25 / 50

25. A water supply system is said to be continuous when it is supplied for:

a) 6 hrs

b) 12 hrs

c) 18 hrs

d) 24 hrs

26 / 50

26. 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

27 / 50

27. 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

28 / 50

28. The minimum height of a flushing cistern is:

a) 1 m

b) 2 m

c) 3 m

d) 5 m

29 / 50

29. Which of the following impurities in water is removed by the sedimentation process?

a) total dissolved solids

b) bacteria

c) iron and manganese

d) suspended solids

30 / 50

30. Mass action' during sedimentation is the property of:

a) decrease in mass of sludge

b) settling of a particle along with the neighboring particle

c) quick spreading of floc

d) increase in mass of sludge

31 / 50

31. 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

32 / 50

32. 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

33 / 50

33. Sanitary sewage means:

a) domestic sewage

b) industrial sewage

c) both (a) and (b) above

d) none of the above

34 / 50

34. Which one is a waterborne disease?

a) malaria

b) cancer

c) dysentery

d) encephalitis

35 / 50

35. Water of zero hardness is obtained by

a) boiling

b) lime-soda process

c) base exchange process

d) none of the above

36 / 50

36. Grade aqueducts are not allowed to run

a) one-fourth full

b) half

c) three

d) full

37 / 50

37. 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

38 / 50

38. 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

39 / 50

39. The location of a well is considered good if it is sunk into

a) coarse gravel

b) silt

c) sand

d) clay

40 / 50

40. Infiltration gallery is a

a) horizontal well

b) vertical well

c) inclined well

d) none of the above

41 / 50

41. For an insignificant effect on the water table, the tube wells are spaced as one in every

a) 0.5 sq km

b) 1.0 sq km

c) 1.5 sq km

d) 2.0 sq km

42 / 50

42. If Q is discharge in cubic meters per second and D is the economical diameter of the pipe, then according to Lea

a) D = 0.67 to 0.87 √Q

b) D = 0.67 to 0.97 √Q

c) D = 0.97 to 1.22 √Q

d) D = 1.22 to 1.32 √Q

43 / 50

43. Self-purification of natural streams is caused due to

a) dilution

b) oxygen reduction

c) sunlight

d) all of the above

44 / 50

44. A 1 m cast iron pipe carries a discharge of 0.785 cum/sec, the velocity of flow will be

a) 0.9 m/sec

b) 1.0 m/sec

c) 1.2 m/sec

d) none of the above

45 / 50

45. Break pressure tank is generally provided in rural water supply schemes if static head exceeds

a) 30 m

b) 40 m

c) 50 m

d) 60 m

46 / 50

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

a) microscope

b) telescope

c) sonoscope

d) osmoscope

47 / 50

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

a) tunnel

b) aqueduct

c) flume

d) conduit

48 / 50

48. The most dangerous metal for human health is

a) zinc

b) copper

c) lead

d) iron

49 / 50

49. Inverted siphon is called:

a) depressed sewer

b) sag sewer

c) both of the above

d) none of the above

50 / 50

50. Sewer which gets discharge from two or more main sewers is called:

a) main sewer

b) trunk sewer

c) combined sewer

d) intercepting sewer

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