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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1 / 30

1. 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

2 / 30

2. 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

3 / 30

3. Manhole is said to be medium if its depth is between:

a) 0.7-0.9 m

b) 0.9-1.2 m

c) 0.9-1.3 m

d) 0.9-1.5 m

4 / 30

4. Dyspepsia (Indigestion) is caused due to

a) iron

b) carbon

c) manganese

d) all of the above

5 / 30

5. Asbestos pipes are

a) highly resistant to corrosion

b) light in weight and easy to transport

c) highly flexible to resist deflection up to 120

d) very smooth

6 / 30

6. The type of joint generally used in cast-iron pipes is

a) flanged joint

b) socket and spigot joint

c) dresser coupling joint

d) all of the above

7 / 30

7. Turbidity is the ability of water to

a) retain suspended solids

b) retain colloidal solids in suspension

c) detain dissolved solids.

d) scatter light

8 / 30

8. The radius of influence of the well varies with

a) rate of pumping

b) water table

c) types of well

d) none of the above

9 / 30

9. To determine the velocity of the flow of underground water, the most commonly used non-empirical formula is....formula:

a) Darcy's

b) Slitcher's

c) Hazen's

d) Lacy's

10 / 30

10. A circular section of sewer has the advantage of:

a) least parameter for a given area

b) offers the least opportunities for deposits

c) more suitable when the discharge is approximately constant

d) all of the above

11 / 30

11. The devices installed for drawing water from the sources are called

a) filters

b) intakes

c) aquifers

d) none of the above

12 / 30

12. Turbidity can be removed by

a) coagulation and filtration

b) aeration and sedimentation

c) activated carbon adsorption

d) disinfections

13 / 30

13. 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

14 / 30

14. The flow in the sewers is minimum during which hours?

a) Night

b) Morning

c) Day

d) Evening

15 / 30

15. The sewerage system originates from:

a) main sewers

b) branch sewers

c) lateral sewers

d) house sewers

16 / 30

16. 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

17 / 30

17. The last trap provided in a house drainage system is:

a) q-trap

b) floor trap

c) nahni trap

d) interception trap

18 / 30

18. Which device warns that the liquid is above the pump level?

a) High-level alarm

b) Check valve

c) Union

d) Pump lift chain

19 / 30

19. Lead in water causes

a) plumbo solvency

b) stains on clothes and paper

c) damages water systems

d) permanent bluish skin

20 / 30

20. Turbidity for domestic water is undesirable because it

a) is unaesthetic

b) causes change of taste

c) gives apparent colour

d) none of the above

21 / 30

21. Selection of material for the pipe depends on

a) carrying capacity of the pipe

b) durability and life of the pipe

c) effect of water to be conveyed on the pipe material

d) all of the above

22 / 30

22. The diameter of pipes in bathrooms and lavatories in domestic water supply is:

a) 10 mm

b) 12 mm

c) 16 mm

d) 20 mm

23 / 30

23. Hydrants are used for tapping water from mains for:

a) fire extinguishing

b) street washing

c) flushing sewer lines

d) all of the above

24 / 30

24. In the one-pipe system of plumbing, the number of vertical pipes is:

a) 1

b) 2

c) 3

d) 4

25 / 30

25. 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

26 / 30

26. 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

27 / 30

27. Pressure relief valve is provided in the water main

a) to reduce the pressure

b) upstream of the sluice

c) at the low point

d) all of the above

28 / 30

28. The specific retention is least in the soil type

a) coarse gravel

b) sand

c) clay

d) silt

29 / 30

29. Air inlet valve is provided in water mains at

a) summit of the pipe

b) downstream of the sluice valve

c) both (a) and (b) of the above

d) upstream of the sluice valve

30 / 30

30. Advantage of pressure conduits is

a) flow is independent of the grade of the hydraulic grade line

b) economical since it follows a shorter path

c) less chance of water pollution as it is closed

d) all of the above

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Water Supply & Sanitation Engineering Online Test – Paper 2

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