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. Turbidity depends on the presence of the following in water

a) suspended solids

b) suspended solids and colloidal solids

c) any material capable of preventing light

d) intensity of coloration

2 / 30

2. 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

3 / 30

3. Most suitable section of sewer in a separate sewage system is:

a) circular section

b) rectangular section

c) egg-shaped section

d) modified egg-shaped section

4 / 30

4. Inspection arm is provided in:

a) manhole

b) drop manhole

c) lamp hole

d) clean out

5 / 30

5. When the limiting non-scouring velocity is 5 m/sec, the type of sewer generally used is:

a) stone ware sewer

b) cast iron sewer

c) brick sewer

d) glazed brick sewer

6 / 30

6. As per Buston's formula, fire demand for in liters per minute for a population of p in thousands, is given by

a) 5663 √p

b) 3182 √p

c) 4640 √p

d) none of the above

7 / 30

7. Tuberculation is caused in a metal pipe due to

a) sulphur-reducing bacteria

b) nitrogen-reducing bacteria

c) oxygen-reducing bacteria

d) phosphorus of total water demand

8 / 30

8. Source of water in the mountains is:

a) tube well

b) well

c) stream

d) none of the above

9 / 30

9. Thrash rack/roughing filter is provided at the entrance of

a) intake

b) slow sand filter

c) rapid sand filter

d) all of the above

10 / 30

10. The sewerage system originates from:

a) main sewers

b) branch sewers

c) lateral sewers

d) house sewers

11 / 30

11. 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

12 / 30

12. 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

13 / 30

13. Most suitable section, when the maximum and minimum flow ratio is not much, is:

a) circular section

b) rectangular section

c) horse-shoe section

d) egg-shaped section

14 / 30

14. Turbidity is the ability of water to

a) retain suspended solids

b) retain colloidal solids in suspension

c) detain dissolved solids.

d) scatter light

15 / 30

15. 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

16 / 30

16. The colour of water is measured on the platinum cobalt scale with the help of

a) thermometer

b) tintometer

c) turbidity meter

d) barometer

17 / 30

17. Flush air inlets are sometimes called:

a) ventilated lamp holes

b) well hole

c) clean outs

d) flushing tank

18 / 30

18. 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

19 / 30

19. A wrong nominal internal diameter in mm for a cast iron (spun) pipe is

a) 300

b) 400

c) 500

d) 550

20 / 30

20. 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

21 / 30

21. 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

22 / 30

22. 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

23 / 30

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

a) 1

b) 2

c) 3

d) 4

24 / 30

24. The sewer pipes:

a) carry sewage as gravity conduits

b) should resist the wear and tear caused due to abrasion

c) are designed for generating self-cleaning velocities at different discharge

d) all of the above

25 / 30

25. The sewer meant to carry excess discharge from an existing sewer is called:

a) main sewer

b) trunk sewer

c) outfall sewer

d) relief sewer

26 / 30

26. The design discharge for the separate sewer system is taken equal to:

a) dry weather flow

b) 2x dry weather flow

c) 4x dry weather flow

d) 6x dry weather flow

27 / 30

27. 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

28 / 30

28. The underground structure in the form of a circular or rectangular tank for the purpose of admitting sewerage into it from the intercepting chamber is called:

a) Soak pit

b) septic tank

c) Cesspool

d) privy pit

29 / 30

29. 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

30 / 30

30. The asbestos cement pipes are generally laid

a) horizontally

b) vertically

c) in any position

d) inclined at 60°

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Water Supply & Sanitation Engineering Online Test – Paper 2

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