Water Supply & Sanitation Engineering Online Test – Paper 2

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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. Service connections to consumer houses are generally provided with

a) copper pipes

b) PVC pipes

c) galvanized pipes

d) cast iron pipes

2 / 30

2. R.M.O. means

a) running

b) maintenance

c) operation

d) all of the above

3 / 30

3. The most commonly used coagulant is:

a) Alum

b) Lime

c) Chlorine

d) Bleaching powder

4 / 30

4. Water demand for public use as compared to the total demand, kept in the design of waterworks for a city, is

a) 5%

b) 10%

c) 20%

d) 25%

5 / 30

5. 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

6 / 30

6. The process of obtaining energy for their (bacteria) synthesis after the oxidation of organic or inorganic matter is called

a) photosynthesis

b) chemosynthesis

c) both

d) none

7 / 30

7. 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

8 / 30

8. The working conditions in imhoff tanks are:

a) aerobic only

b) anaerobic only

c) aerobic in the lower and anaerobic in the upper compartment

d) anaerobic in the lower and aerobic in the upper compartment

9 / 30

9. Kidney damage may be caused due to excess concentration of

a) fluorides

b) nitrates

c) chlorides

d) nitrites

10 / 30

10. 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

11 / 30

11. Priming is the process of

a) removing the trapped air from the pump

b) removing the trapped water from the pump

c) removing the debris waste from the pump

d) all of the above

12 / 30

12. The common pipe used in house plumbing is:

a) PVC

b) HDPE

c) GI

d) CI

13 / 30

13. The types of pipe which are generally laid vertically due to low strength is

a) copper

b) concrete

c) asbestos cement

d) cast iron

14 / 30

14. 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

15 / 30

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

a) 1

b) 2

c) 3

d) 4

16 / 30

16. The color of septic sewage is:

a) grey

b) black

c) white

d) blue

17 / 30

17. For separate and partially separate systems, the pattern of collection suitable is:

a) perpendicular pattern

b) interceptor pattern

c) radial pattern

d) fan pattern

18 / 30

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

a) Calcium sulphate

b) Magnesium sulphate

c) Calcium nitrate

d) Calcium bicarbonate

19 / 30

19. Sewage is treated by aerobic bacteria action in:

a) septic tank

b) settling tank

c) trickling filter

d) oxidation pond

20 / 30

20. 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

21 / 30

21. The approximate diameter of a water mains for supplying 7.15 mld with 1.21 m/sec velocity flow will be

a) 10 cm

b) 20 cm

c) 30 cm

d) 50 cm

22 / 30

22. Traddle pump is operated by

a) hand

b) foot

c) electric

d) all of the above

23 / 30

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

a) 90%

b) 75%

c) 85%

d) 70%

24 / 30

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

a) egg-shaped

b) horse-shoe

c) circular

d) elliptical

25 / 30

25. In strainer type wells

a) the flow is radial

b) the flow is spherical

c) area of flow depends upon the size of the cavity

d) all of the above

26 / 30

26. 2 ml of sewage, having BOD-500 mg/l, is diluted to 200 ml, and incubated for 5 days at 20°C. If the D.O. content after 5 days is found to be 5 mg/l, what was the initial D.O. content of the diluted sample?

a) 10 mg/l

b) 5 mg/l

c) 1 mg/l

d) none of the above

27 / 30

27. 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

28 / 30

28. The working chamber of a manhole, along the direction of flow should have a minimum length for depth more than 0.8m:

a) 0.6 m

b) 0.9 m

c) 1.2 m

d) 2.4 m

29 / 30

29. The most dangerous metal for human health is

a) zinc

b) copper

c) lead

d) iron

30 / 30

30. A complete water supply system includes:

a) construction of intake and collection chamber

b) digging of a well for water

c) construction of a dam for a reservoir

d) the entire arrangement from source to distribution

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Water Supply & Sanitation Engineering Online Test – Paper 2

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