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. 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

2 / 30

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

a) confined

b) unconfined

c) perched

d) none of the above

3 / 30

3. Asbestos pipes are

a) highly resistant to corrosion

b) light in weight and easy to transport

c) highly flexible to resist deflection up to 120

d) very smooth

4 / 30

4. The self-cleaning velocity normally adopted for a sewer is:

a) less than 1 m/sec

b) 1.0 m/sec to 1.2 m/sec

c) 1.5 m/sec to 1.2 m/sec

d) more than 2.0 m/sec

5 / 30

5. 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

6 / 30

6. Grit obtained in a grit chamber is used for:

a) as a manure

b) as a soil conditioner

c) as a coarse aggregate

d) as a substitute for sand

7 / 30

7. The flow in the sewers is minimum during which hours?

a) Night

b) Morning

c) Day

d) Evening

8 / 30

8. The layout of the distribution system that is suitable for haphazardly growing cities is:

a) dead-end system

b) grid iron system

c) ring system

d) radial system

9 / 30

9. Computation of discharges is difficult for:

a) dead-end system

b) grid iron system

c) ring system

d) radial system

10 / 30

10. The last trap provided in a house drainage system is:

a) q-trap

b) floor trap

c) nahni trap

d) interception trap

11 / 30

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

a) 1

b) 2

c) 3

d) 4

12 / 30

12. Factors considered in the selection of the site for the intake point are that it should be

a) nearer to the treatment plant

b) in the pure zone of the water source

c) upstream of the point of disposal of wastewater

d) all of the above

13 / 30

13. The curve showing the level of water in a well and the original water table is known as

a) inverted cone of depression

b) drawdown curve

c) circle of influence

d) all of the above

14 / 30

14. 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

15 / 30

15. 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

16 / 30

16. "Dental Caries" will be absent where the following is present

a) mottled enamel of teeth

b) itai-itai

c) methemoglobinemia

d) cancer

17 / 30

17. Inverted siphon is called:

a) depressed sewer

b) sag sewer

c) both of the above

d) none of the above

18 / 30

18. A communicable disease is

a) cancer

b) fluorosis

c) tuberculosis

d) goitre

19 / 30

19. Most commonly used section in the grade aqueduct is

a) circular

b) rectangular

c) parabolic

d) all of the above

20 / 30

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

a) more depth

b) less depth

c) more discharge

d) less discharge

21 / 30

21. 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

22 / 30

22. Groundwater is generally free from

a) suspended impurities

b) dissolved impurities

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

d) none of the above

23 / 30

23. Abbreviation which is correct?

a) TOC (Total Organic Carbon)

b) ThOD (Theoretical Oxygen Demand)

c) TOD (Total Oxygen Demand)

d) all of the above

24 / 30

24. The specific retention is least in the soil type

a) coarse gravel

b) sand

c) clay

d) silt

25 / 30

25. Highly colored waters are

a) unaesthetic

b) highly polluted

c) require elaborate

d) rich in iron and manganese.

26 / 30

26. The distribution mains in a water supply system are designed for

a) maximum daily demand

b) peak hourly demand

c) average daily demand

d) maximum hourly demand on the maximum consumption day

27 / 30

27. Turbidity of water is measured in

a) mg/1

b) Nephelometric Turbidity Unit (NTU)

c) potassium chloroplatinate units

d) threshold number

28 / 30

28. Widely used pipe for rural water supply in Nepal is:

a) HDPE pipes

b) GI pipes

c) PVC pipes

d) CI pipes

29 / 30

29. Goaty water refers to...

a) odour of water

b) turbidity of water

c) colour of water

d) all of the above

30 / 30

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

a) fluorides

b) nitrates

c) chlorides

d) nitrites

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