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. The water carriage sewage system:

a) is cheaper in initial cost than dry conveyance system

b) requires treatment before disposal

c) creates a hygienic problem

d) all of the above

2 / 30

2. A goose neck is:

a) a bent flexible pipe between ferrule and stop cock

b) a T-shaped brass between ferrule and water meter

c) a straight G.I. pipe between the service pipe and stop cock

d) a bent rigid pipe between the service pipe and water meter

3 / 30

3. Iron and manganese are estimated by

a) jar test

b) winkler test

c) calorimetric test

d) none of the above

4 / 30

4. 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

5 / 30

5. From the septic tank, the effluents are discharged into:

a) drainage

b) soak pit

c) sewer

d) none of the above

6 / 30

6. The hourly variation factor is generally taken

a) 1.2

b) 1.5

c) 1.8

d) 2.3

7 / 30

7. Non-scouring velocity in concrete sewer is caused by:

a) 2.5 to 3.0 m/sec

b) 2.5 to 3.5 m/sec

c) 1.5 to 2.5 m/sec

d) 0.6 to 1.2 m/sec

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. Dyspepsia (Indigestion) is caused due to

a) iron

b) carbon

c) manganese

d) all of the above

10 / 30

10. A sewer that collects sewage from toilets is called:

a) lateral sewer

b) branch sewer

c) main sewer

d) outfall sewer

11 / 30

11. Most common sources of water in hill and terai in our country are...respectively.

a) surface and ground

b) ground and surface

c) surface and surface

d) ground and ground

12 / 30

12. Water to the consumers may be supplied from

a) rainy wells sunk to the water level

b) infiltration well dug out on the banks of rivers

c) infiltration galleries connected to a sump well

d) all of the above

13 / 30

13. 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

14 / 30

14. When the fall in elevation is greater than 60cm, the manhole provided is called:

a) lamp hole

b) flight manhole

c) drop manhole

d) fall manhole

15 / 30

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

a) confined

b) unconfined

c) perched

d) none of the above

16 / 30

16. A communicable disease is

a) cancer

b) fluorosis

c) tuberculosis

d) goitre

17 / 30

17. Turbidity of water sample depends on

a) concentration and density of suspended and colloidal solids

b) concentration of suspended, colloidal, and dissolved solids

c) concentration of organic and inorganic matter

d) concentration, size, shape, and refractive index of suspended solids

18 / 30

18. 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

19 / 30

19. If p is the population of a place in thousands then the fire demand of water in liters per minute, according to Kuichling formula, is given by

a) 5663 √p

b) 3182 √p

c) 4640 √p

d) none of the above

20 / 30

20. The detention time in a septic tank is usually:

a) 1-2 hours

b) 5-6 hours

c) 18-24 hours

d) 22-24 hours

21 / 30

21. In the above problem 151, using Manning's formula with n = 0.014 then the hydraulic gradient will be

a) 1:200

b) 1:400

c) 1:800

d) 1:1000

22 / 30

22. The slope of the hydraulic grade line is always towards the well due to pumping. This line of depressed water table is called

a) drawdown curve

b) circle of influence

c) dynamic gradient

d) an inverted cone of depression

23 / 30

23. Thrash rack/roughing filter is provided at the entrance of

a) intake

b) slow sand filter

c) rapid sand filter

d) all of the above

24 / 30

24. Computation of discharges is difficult for:

a) dead-end system

b) grid iron system

c) ring system

d) radial system

25 / 30

25. The water supply demand in a day school without a boarder should be

a) 10 lpcd

b) 20 lpcd

c) 30 lpcd

d) 40 lpcd

26 / 30

26. Absolutely soft waters are required for

a) drinking

b) boilers

c) prevention of corrosion in pipes

d) washing with synthetic detergent soap

27 / 30

27. As the diameter of the sewer increases, the self-cleaning velocity:

a) increases

b) decreases

c) remains constant

d) depends on other factors

28 / 30

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

a) 90%

b) 75%

c) 85%

d) 70%

29 / 30

29. Pump efficiency is 85%, motor efficiency is 94% then the combined efficiency of the two is

a) 90%

b) 80%

c) 70%

d) 85%

30 / 30

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

a) more depth

b) less depth

c) more discharge

d) less discharge

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