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. Pick up the correct statement:

a) If PH<7 then sewage is acidic

b) If PH>7 then sewage is alkaline

c) If PH=7 the sewage is neutral

d) all of the above

2 / 30

2. Asbestos pipes are joined by means of

a) flanged joint

b) flexible joint

c) simplex joint

d) dresser coupling joint

3 / 30

3. Minimum required residual head at the public tap stand is not less than

a) 15

b) 10

c) 5

d) 20

4 / 30

4. The average discharge of a tube-well is about

a) 5 liters/sec

b) 50 liters/sec

c) 100 liters/sec

d) 500 liters/sec

5 / 30

5. The types of formwork provided for ferrocement tank in rural water supply schemes are

a) steel

b) wood

c) HDP pipe

d) all of the above

6 / 30

6. In Chezy's formula v=c√ms for calculating the velocity of flow in a circular sewer, the Chezy's constant c depends upon:

a) size of the sewer

b) shape of the sewer

c) roughness of the sewer

d) all of the above

7 / 30

7. Source of water in the mountains is:

a) tube well

b) well

c) stream

d) none of the above

8 / 30

8. The depression of the water table in a well due to pumping will be maximum

a) at a distance r from the well

b) at a distance r/2 from the well

c) close to the well

d) none of the above

9 / 30

9. Choose the odd statement:

a) sewage is received in a wet well

b) sewage is received in a dry well

c) both of the above

d) none of the above

10 / 30

10. Laying of a sewer is generally done with the help of:

a) sight rails and boning rod

b) theodolite and staff

c) leveling and staff

d) all of the above

11 / 30

11. Salvaging is:

a) extraction of essence from waste

b) dumping of solid waste

c) sanitary land filling of solid waste

d) none of the above

12 / 30

12. The bacteria which require free oxygen for their survival are called:

a) aerobic bacteria

b) anaerobic bacteria

c) facultative bacteria

d) none of the above

13 / 30

13. PH value is a symbol for....material:

a) hydrogen

b) magnesium

c) calcium

d) sodium

14 / 30

14. If D is the diameter of the upper circular portion, the overall depth of a standard egg-shaped section, is:

a) D

b) 1.2D

c) 1.5D

d) 2D

15 / 30

15. Aeration of water is done by

a) spray nozzles

b) cascading

c) trickling bed

d) all of the above

16 / 30

16. The common pipe used in house plumbing is:

a) PVC

b) HDPE

c) GI

d) CI

17 / 30

17. 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

18 / 30

18. Groundwater from artesian wells

a) contains no suspended materials

b) contains dissolved salts

c) requires less treatment

d) all of the above

19 / 30

19. Merit of water carriage sewage system:

a) no human agency is involved in this system

b) no problem of foul smell or hygienic trouble

c) less area is required

d) all of the above

20 / 30

20. Purest water may have

a) no colour

b) faint blue-green colour

c) dark blue colour

d) brownish-yellow colour

21 / 30

21. 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

22 / 30

22. Turbidity is the ability of water to

a) retain suspended solids

b) retain colloidal solids in suspension

c) detain dissolved solids.

d) scatter light

23 / 30

23. Which is the oldest waterworks in Nepal?

a) Bhim Dhara scheme

b) Bir Dhara scheme

c) Sundarijal scheme

d) Dudh Pokhari scheme

24 / 30

24. Depth of shallow tube well shall not be more than (considering economic point):

a) 30 m

b) 40 m

c) 50 m

d) 60 m

25 / 30

25. Poppet valve is a type of

a) air valve

b) blow-off valve

c) sluice valve

d) none of the above

26 / 30

26. 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

27 / 30

27. In the partially ventilated single-stack system of plumbing, the number of vertical pipes is:

a) 1

b) 2

c) 3

d) 4

28 / 30

28. A perched aquifer generally occurs

a) in an aquiclude

b) in an artesian aquifer

c) above the water table

d) below the water table

29 / 30

29. For a 150mm diameter sewer, the gradient required to generate self-cleaning velocity is:

a) 1 in 10

b) 1 in 100

c) 1 in 200

d) 1 in 300

30 / 30

30. R.M.O. means

a) running

b) maintenance

c) operation

d) all of the above

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Water Supply & Sanitation Engineering Online Test – Paper 2

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