Water Supply & Sanitation Engineering Online Test

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Vikash chaudhary

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Total Questions: 30
Time Allotted: 30 minutes
Passing Score: 50%
Randomization: Yes
Certificate: No
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1 / 30

1. Which traps have curved legs?

a) P-Trap

b) Q-Trap

c) gully trap

d) S-Trap

2 / 30

2. 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

3 / 30

3. Gravity water supply system starts from

a) intake

b) collection chamber

c) BPT

d) faucet

4 / 30

4. Water horsepower of a pump is given by

a) WHQ / 75

b) WHQ / 360

c) WHQ / 220

d) WHQ / 85

5 / 30

5. 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

6 / 30

6. After incubating a 2.5% solution of a sewage sample for 5 days at 20°C, the depletion of oxygen was found to be 5 PPM. The BOD of the sewage will be recorded as:

a) 5 PPM

b) 50 PPM

c) 100 PPM

d) 200 PPM

7 / 30

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

a) more depth

b) less depth

c) more discharge

d) less discharge

8 / 30

8. Following material is used during drilling to prevent caving

a) bentonite

b) thixotropy

c) both (a) and (b) above

d) none of the above

9 / 30

9. Excess concentration of sodium salts in water causes

a) hardness

b) bitter taste

c) alkalinity

d) laxative effect

10 / 30

10. The commonly used material for water supply pipes having the property of not easily corroded, strong, long life but heavy and brittle is

a) steel

b) cast iron

c) wrought iron

d) RCC

11 / 30

11. By boiling water, hardness can be removed if it is due to:

a) Calcium sulphate

b) Magnesium sulphate

c) Calcium nitrate

d) Calcium bicarbonate

12 / 30

12. The gradient of a sewer is:

a) given in the direction of the natural slope of the ground

b) given in the opposite direction of the natural slope of the ground

c) zero

d) more than 1 in 20

13 / 30

13. Advantage of pressure conduits is

a) flow is independent of the grade of the hydraulic grade line

b) economical since it follows a shorter path

c) less chance of water pollution as it is closed

d) all of the above

14 / 30

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

a) zinc

b) lead

c) silver

d) aluminum

15 / 30

15. The water supply demand in a fully plumbed system in Nepal context

a) 45 lpcd

b) 65 lpcd

c) 112 lpcd

d) 135 lpcd

16 / 30

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 / 30

17. 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

18 / 30

18. 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

19 / 30

19. Most suitable section, when the maximum and minimum flow ratio is not much, is:

a) circular section

b) rectangular section

c) horse-shoe section

d) egg-shaped section

20 / 30

20. Time of concentration depends upon:

a) slope of the catchment

b) intensity of rainfall

c) nature of soil

d) all of the above

21 / 30

21. 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

22 / 30

22. Garbage dumping home is:

a) places where garbage is kept

b) places where garbage is disposed

c) places where garbage is treated

d) all of the above

23 / 30

23. 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

24 / 30

24. An egg-shaped section of sewer:

a) is economical than a circular section

b) is more stable than a circular section

c) provides self-cleansing velocity at low discharge

d) all of the above

25 / 30

25. 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

26 / 30

26. 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

27 / 30

27. Flush air inlets are sometimes called:

a) ventilated lamp holes

b) well hole

c) clean outs

d) flushing tank

28 / 30

28. The sewer pipes:

a) carry sewage as gravity conduits

b) should resist the wear and tear caused due to abrasion

c) are designed for generating self-cleaning velocities at different discharge

d) all of the above

29 / 30

29. "Puits developee" is generally provided in case of

a) well

b) tube well

c) reservoir

d) none of the above

30 / 30

30. An advantage of the intermittent system of the water supply system:

a) Repairs can be carried out during non-supply hours

b) Chances of wastage of water are less

c) Less quantity of water is used

d) All of the above

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