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%
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Certificate: No
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1 / 30

1. During the water test of sewer, 2 lit/cm of dia/km of sewer line may be allowed for a period of:

a) 5 minutes

b) 30 minutes

c) 15 minutes

d) 20 minutes

2 / 30

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

a) zinc

b) lead

c) silver

d) aluminum

3 / 30

3. Manhole is said to be deep if its depth is more than:

a) 1.5 m

b) 1.70 m

c) 1.9 m

d) 2.1 m

4 / 30

4. A 1 m cast iron pipe carries a discharge of 0.785 cum/sec, the velocity of flow will be

a) 0.9 m/sec

b) 1.0 m/sec

c) 1.2 m/sec

d) none of the above

5 / 30

5. Asbestos pipes are joined by means of

a) flanged joint

b) flexible joint

c) simplex joint

d) dresser coupling joint

6 / 30

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

a) 90%

b) 80%

c) 70%

d) 85%

7 / 30

7. Traddle pump is operated by

a) hand

b) foot

c) electric

d) all of the above

8 / 30

8. 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

9 / 30

9. The bacteria which can survive with or without oxygen is known as...

a) aerobic bacteria

b) anaerobic bacteria

c) facultative bacteria

d) none of the above

10 / 30

10. Inverted siphon is made of:

a) one pipe

b) two pipes

c) three pipes

d) four pipes

11 / 30

11. Iron and manganese are estimated by

a) jar test

b) winkler test

c) calorimetric test

d) none of the above

12 / 30

12. Water horsepower of a pump is given by

a) WHQ / 75

b) WHQ / 360

c) WHQ / 220

d) WHQ / 85

13 / 30

13. 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

14 / 30

14. The water supply pipeline should be tested at a specified pressure for

a) one hour

b) two hours

c) three hours

d) four hours

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. Shrouding is the process of filling gravel, bajri, etc., in

a) slotted tube well

b) strainer tube well

c) perforated tube well

d) cavity tube well

17 / 30

17. A sewer, which gets its flow from a number of transverse sewers, is known as:

a) interceptor

b) interconnector

c) head sewer

d) branch sewer

18 / 30

18. The factor for the selection of the pumping station site is

a) distance of the source of contamination or pollution

b) height above the H.F.L. of the river

c) future expansion

d) all of the above

19 / 30

19. 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

20 / 30

20. 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

21 / 30

21. 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

22 / 30

22. Septic tank effluent is:

a) quite clear and sparkling

b) always odorless

c) having fine organic solids with high BOD

d) black tarry liquor with an earthy odor

23 / 30

23. Coefficient of permeability is maximum for

a) clean gravel

b) clay

c) fine sand

d) silt

24 / 30

24. 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%

25 / 30

25. The water supply system whose main, sub-main, and branches are interconnected with each other is:

a) dead-end system

b) grid iron system

c) ring system

d) radial system

26 / 30

26. 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

27 / 30

27. Which is the oldest waterworks in Nepal?

a) Bhim Dhara scheme

b) Bir Dhara scheme

c) Sundarijal scheme

d) Dudh Pokhari scheme

28 / 30

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

a) dilution

b) oxygen reduction

c) sunlight

d) all of the above

29 / 30

29. A source of colour in water is due to

a) silt

b) clay

c) organic debris

d) inorganic inert matter

30 / 30

30. A circular gravity aqueduct is preferred because of

a) its maximum hydraulic mean depth

b) maximum area per unit of wetted perimeter

c) minimum cost of construction

d) all of the above

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Water Supply & Sanitation Engineering Online Test – Paper 2

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