Water Supply & Sanitation Engineering Online Test

Created by

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 of water is measured in

a) mg/1

b) Nephelometric Turbidity Unit (NTU)

c) potassium chloroplatinate units

d) threshold number

2 / 30

2. The rate of flow in an artesian spring is continuous and

a) increases in the rainy season

b) is constant in all conditions

c) increases as the water table rises

d) decreases in the drought season

3 / 30

3. Sewage is treated by aerobic bacteria action in:

a) septic tank

b) settling tank

c) trickling filter

d) oxidation pond

4 / 30

4. Groundwater from artesian wells

a) contains no suspended materials

b) contains dissolved salts

c) requires less treatment

d) all of the above

5 / 30

5. 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

6 / 30

6. 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

7 / 30

7. Inverted siphon is made of:

a) one pipe

b) two pipes

c) three pipes

d) four pipes

8 / 30

8. Abbreviation which is correct?

a) TOC (Total Organic Carbon)

b) ThOD (Theoretical Oxygen Demand)

c) TOD (Total Oxygen Demand)

d) all of the above

9 / 30

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

a) 1

b) 2

c) 3

d) 4

10 / 30

10. Dyspepsia (Indigestion) is caused due to

a) iron

b) carbon

c) manganese

d) all of the above

11 / 30

11. 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

12 / 30

12. A flight sewer is provided when the gradient is:

a) low

b) steep

c) maximum (i.e., vertical)

d) zero

13 / 30

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

a) hydrogen

b) magnesium

c) calcium

d) sodium

14 / 30

14. In the single-stack system of plumbing, the number of vertical pipes is:

a) 1

b) 2

c) 3

d) 4

15 / 30

15. Designation of GI pipe is done with:

a) internal diameter

b) external diameter

c) center line

d) none of the above

16 / 30

16. 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

17 / 30

17. Stoneware pipes are generally not used for sewer mains because they are:

a) weak in compression

b) weak in tension

c) hydraulically less efficient

d) less resistant to organic corrosion

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. Baffle wall in septic tank is:

a) Short side wall

b) Long side wall

c) Honeycomb inner wall

d) None of the above

20 / 30

20. 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

21 / 30

21. 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

22 / 30

22. Goaty water refers to...

a) odour of water

b) turbidity of water

c) colour of water

d) all of the above

23 / 30

23. A source of colour in water is due to

a) silt

b) clay

c) organic debris

d) inorganic inert matter

24 / 30

24. Turbidity can be removed by

a) coagulation and filtration

b) aeration and sedimentation

c) activated carbon adsorption

d) disinfections

25 / 30

25. 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

26 / 30

26. Kidney damage may be caused due to excess concentration of

a) fluorides

b) nitrates

c) chlorides

d) nitrites

27 / 30

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

a) catch basin

b) well holes

c) clean outs

d) flushing tanks

28 / 30

28. Gravity water supply system starts from

a) intake

b) collection chamber

c) BPT

d) faucet

29 / 30

29. The hourly variation factor is generally taken

a) 1.2

b) 1.5

c) 1.8

d) 2.3

30 / 30

30. 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

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