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. As compared to shallow tube wells, deep wells have

a) more depth

b) less depth

c) more discharge

d) less discharge

2 / 50

2. 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

3 / 50

3. Excess concentration of magnesium salts in water causes

a) hardness

b) bitter taste

c) alkalinity

d) laxative effect

4 / 50

4. 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

5 / 50

5. 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

6 / 50

6. 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

7 / 50

7. The sewage consists of water:

a) 80%

b) 90%

c) 95%

d) 99.9%

8 / 50

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

a) dilution

b) oxygen reduction

c) sunlight

d) all of the above

9 / 50

9. Which metal is good for keeping drinking water?

a) copper

b) brass

c) zinc

d) iron

10 / 50

10. The velocity of flow does not depend on:

a) grade of sewer

b) hydraulic mean depth of sewer

c) roughness of sewer

d) length of sewer

11 / 50

11. If the diameter of a sewer is 150 mm, the gradient required for generating a self-cleaning velocity is:

a) 1 in 10

b) 1 in 100

c) 1 in 200

d) 1 in 300

12 / 50

12. 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

13 / 50

13. Scour valves are provided

a) at every summit of rising mains

b) at very depression and dead ends to drain out the waste water that may collect there

c) at street corners to control the flow of water

d) all of the above

14 / 50

14. 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

15 / 50

15. 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

16 / 50

16. A source of colour in water is due to

a) silt

b) clay

c) organic debris

d) inorganic inert matter

17 / 50

17. 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

18 / 50

18. 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

19 / 50

19. Clean out is provided in the underground......sewer in place of manhole.

a) main sewer

b) trunk sewer

c) outfall sewer

d) lateral sewer

20 / 50

20. 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

21 / 50

21. 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

22 / 50

22. Before entering a manhole, a candle is lowered into the manhole:

a) to illuminate it

b) to detect toxic gases

c) to give a signal to the adjacent manhole

d) to find out the presence of oxygen

23 / 50

23. In an egg-shaped sewer section, the maximum discharge occurs when the depth of flow is: (where d is the total depth of the section)

a) 0.25d

b) 0.50d

c) 0.75d

d) 0.95d

24 / 50

24. Iron and manganese are estimated by

a) jar test

b) winkler test

c) calorimetric test

d) none of the above

25 / 50

25. The main function of a manhole is:

a) cleaning of sewer

b) inspection of sewer

c) joining different types of sewer

d) joining different grade of sewer

26 / 50

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

a) 1

b) 2

c) 3

d) 4

27 / 50

27. Any trap is intended to trap foul gases with the provision of:

a) clear seal

b) sewage or sullage

c) otta seal

d) water seal

28 / 50

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

a) 1

b) 2

c) 3

d) 4

29 / 50

29. Water for domestic consumption should be:

a) colorless, odorless & tasteless

b) free from dissolved salts

c) hygienically safe

d) attractive for looks

30 / 50

30. 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

31 / 50

31. 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

32 / 50

32. 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

33 / 50

33. 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

34 / 50

34. The clarigesters are:

a) circular septic tanks

b) circular imhoff double storage tanks without bottom hoppers

c) rectangular septic tanks

d) none of the above

35 / 50

35. The capacity of Guheswari STP is:

a) 15.4 Mld

b) 1.1 Mld

c) 0.50 Mld

d) 12.1 Mld

36 / 50

36. The maximum diameter of a sewer pipe should preferably be:

a) 100 cm

b) 200 cm

c) 300 cm

d) 450 cm

37 / 50

37. 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

38 / 50

38. Which test is a must for a house sewer?

a) water test

b) air test

c) compaction test

d) smoke test

39 / 50

39. The difference between a septic tank and an imhoff tank is that in an imhoff tank:

a) digestion takes place in a different compartment

b) it is suitable for serving a much bigger population

c) both (a) and (b) of above

d) none of the above

40 / 50

40. Turbidity for domestic water is undesirable because it

a) is unaesthetic

b) causes change of taste

c) gives apparent colour

d) none of the above

41 / 50

41. 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

42 / 50

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

a) confined

b) unconfined

c) perched

d) none of the above

43 / 50

43. 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

44 / 50

44. Odour is measured in terms of...

a) threshold number

b) reynold number

c) mach number

d) none of the above

45 / 50

45. Goaty water refers to...

a) odour of water

b) turbidity of water

c) colour of water

d) all of the above

46 / 50

46. To compensate for losses, thefts, and wastage of water, an allowance made of (as per NWSC)

a) 5%

b) 10%

c) 15%

d) 35%

47 / 50

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

a) zone pattern

b) fan pattern

c) radial pattern

d) perpendicular pattern

48 / 50

48. 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%

49 / 50

49. Dengue is termed as which type of disease?

a) Waterborne

b) Water washed

c) Water based

d) Water related

50 / 50

50. A structure constructed to remove obstacles in the sewer is known as:

a) catch basin

b) well holes

c) clean outs

d) flushing tanks

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