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. Sewage is treated by aerobic bacteria action in:

a) septic tank

b) settling tank

c) trickling filter

d) oxidation pond

2 / 30

2. Break pressure tank in a water supply system is incorporated to:

a) Store water under pressure

b) Treat water by adequate pressure

c) Release the pressure generated in the pipe

d) Break the pressure

3 / 30

3. The valve provided on the suction pipe in a tube-well is

a) air relief valve

b) reflux valve

c) pressure

d) sluice valve

4 / 30

4. Sluice valves in main water supplies are

a) used to regulate the flow

b) spaced about 5 km apart

c) generally provided at the summits

d) all of the above

5 / 30

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

a) hydrogen

b) magnesium

c) calcium

d) sodium

6 / 30

6. Dengue is termed as which type of disease?

a) Waterborne

b) Water washed

c) Water based

d) Water related

7 / 30

7. The gradient to be provided for sewers depends upon:

a) the diameter of the sewer

b) the discharge

c) sewer pipe material

d) all of the above

8 / 30

8. Groundwater from artesian wells

a) contains no suspended materials

b) contains dissolved salts

c) requires less treatment

d) all of the above

9 / 30

9. 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

10 / 30

10. To compensate for losses, thefts, and wastage of water, an allowance made of (as per NWSC)

a) 5%

b) 10%

c) 15%

d) 35%

11 / 30

11. 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

12 / 30

12. A perched aquifer generally occurs

a) in an aquiclude

b) in an artesian aquifer

c) above the water table

d) below the water table

13 / 30

13. 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

14 / 30

14. Traddle pump is operated by

a) hand

b) foot

c) electric

d) all of the above

15 / 30

15. 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

16 / 30

16. 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

17 / 30

17. 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

18 / 30

18. Gravity conduits

a) carry water under gravity

b) follow the hydraulic gradient line

c) are carried through tunnels in deep cutting

d) all of the above

19 / 30

19. Mass curve is used for the determination of

a) area of reservoir

b) depth of reservoir

c) capacity of reservoir

d) all of the above

20 / 30

20. After incubating a 2.5% solution of a sewage sample for 5 days at 20°C, the depletion of oxygen was found to be 5 PPM. The BOD of the sewage will be recorded as:

a) 5 PPM

b) 50 PPM

c) 100 PPM

d) 200 PPM

21 / 30

21. 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%

22 / 30

22. 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

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. A tube well of 38cm diameter has depths before and after pumping at 10.7 m and 4.60, respectively. The coefficient of permeability is 2273 liters per day. If the radius of the circle of influence is 304.8m. The yield from the tube well will be

a) 500,00 liters per day

b) 600,00 liters per day

c) 750,00 liters per day

d) 900,00 liters per day

25 / 30

25. The most commonly used coagulant is:

a) Alum

b) Lime

c) Chlorine

d) Bleaching powder

26 / 30

26. At the socket and spigot joint,

a) the enlarged end of the pipe is called a socket

b) the normal end of the pipe is called a spigot

c) the spigot is fitted into the socket

d) all of the above

27 / 30

27. Disinfection of water involves.....

a) killing of diseases bacteria

b) produce of diseases of water

c) no change diseases bacteria

d) none of the above

28 / 30

28. 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

29 / 30

29. The process of obtaining energy for their (bacteria) synthesis after the oxidation of organic or inorganic matter is called

a) photosynthesis

b) chemosynthesis

c) both

d) none

30 / 30

30. For areas of distributed rainfall throughout the year with less intensity, the suitable system of sanitation is:

a) separate system

b) combined system

c) partially separate system

d) partially combined system

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Water Supply & Sanitation Engineering Online Test – Paper 2

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