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. 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. 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

3 / 30

3. A structure constructed to remove obstacles in the sewer is known as:

a) catch basin

b) well holes

c) clean outs

d) flushing tanks

4 / 30

4. The water collected for the sample from the

a) 10-20 cm below from the surface

b) 20-30 cm below from the surface

c) 30-40 cm below from the surface

d) 40-50 cm below from the surface

5 / 30

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

a) 90%

b) 80%

c) 70%

d) 85%

6 / 30

6. 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

7 / 30

7. The type of joint used in HDP pipe is

a) butt welding

b) solvent welding

c) thread joint

d) dresser coupling joint

8 / 30

8. Inverted siphon is called:

a) special sewer

b) general sewer

c) storm sewer

d) none of the above

9 / 30

9. Which is the oldest waterworks in Nepal?

a) Bhim Dhara scheme

b) Bir Dhara scheme

c) Sundarijal scheme

d) Dudh Pokhari scheme

10 / 30

10. Thrust blocks are installed wherever there is a

a) change in the direction or size of the pipeline

b) change in the pressure line diagram

c) pipeline ends at a dead end

d) all of the above

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. The types of pump suitable for water as well as sewage

a) rotary pump

b) centrifugal pump

c) reciprocating pump

d) impulse pump

13 / 30

13. Physical characteristics of sewage include:

a) Turbidity

b) Color

c) Odor

d) All of the above

14 / 30

14. Imhoff tank is a:

a) one-storey sedimentation tank

b) two-storey sedimentation tank

c) three-storey sedimentation tank

d) four-storey sedimentation tank

15 / 30

15. If the diameter of the main pipe is taken less than the economical diameter, then

a) head loss will be high

b) cost of pipe will be less

c) cost of pumping will be more

d) all of the above

16 / 30

16. Water horsepower of a pump is given by

a) WHQ / 75

b) WHQ / 360

c) WHQ / 220

d) WHQ / 85

17 / 30

17. Minimum depth of infiltration gallery is

a) 2 m

b) 3 m

c) 4 m

d) 5 m

18 / 30

18. 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

19 / 30

19. When more than two sewers join in a manhole:

a) their tops should be at the same level

b) their centers should be at the same level

c) their bottoms should be at the same level

d) they can be either way

20 / 30

20. A source of colour in water is due to

a) silt

b) clay

c) organic debris

d) inorganic inert matter

21 / 30

21. Fluoridation is done to

a) protect children's teeth

b) protect from dental fluorosis

c) protect from both dental and skeletal fluorosis

d) add taste to water

22 / 30

22. 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

23 / 30

23. 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

24 / 30

24. 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

25 / 30

25. Slow sand filter is efficient to remove bacteria from the raw water to an extent of:

a) 50%

b) 70%

c) 85%

d) 99%

26 / 30

26. The amount of BOD in domestic water should be

a) 1 ppm

b) 2 ppm

c) 3 ppm

d) nil

27 / 30

27. An aquiclude is

a) a non-artesian aquifer

b) a large underground water body

c) a confined bed of impervious material between aquifers

d) an artesian aquifer

28 / 30

28. GI pipe coming from both sides is joined with a fitting called:

a) Tee

b) Union

c) Elbow

d) Socket

29 / 30

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

a) one hour

b) two hours

c) three hours

d) four hours

30 / 30

30. Turbidity is measured by the

a) concentration of suspended solids collected after centrifuging

b) concentration of colloidal and suspended solids after sedimentation

c) intensity of light scattered when light is passed through

d) difference in suspended solid concentration before and after filtration

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Water Supply & Sanitation Engineering Online Test – Paper 2

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