Water Supply & Sanitation Engineering Online Test – Paper 2

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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. Following material is used during drilling to prevent caving

a) bentonite

b) thixotropy

c) both (a) and (b) above

d) none of the above

2 / 30

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

a) 5%

b) 10%

c) 15%

d) 35%

3 / 30

3. The clarigesters are:

a) circular septic tanks

b) circular imhoff double storage tanks without bottom hoppers

c) rectangular septic tanks

d) none of the above

4 / 30

4. Suitable sewer section for both combined and separate systems is:

a) circular section

b) rectangular section

c) egg-shaped section

d) horse-shoe type section

5 / 30

5. The type of joint used in HDP pipe is

a) butt welding

b) solvent welding

c) thread joint

d) dresser coupling joint

6 / 30

6. Odour is measured in terms of...

a) threshold number

b) reynold number

c) mach number

d) none of the above

7 / 30

7. Gastrointestinal irritation is produced because of excess of the following in water

a) chlorides

b) sulphates

c) nitrates

d) phosphates

8 / 30

8. The difference between a septic tank and an imhoff tank is that in an imhoff tank:

a) digestion takes place in a different compartment

b) it is suitable for serving a much bigger population

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

d) none of the above

9 / 30

9. Turbidity is measured by the

a) concentration of suspended solids collected after centrifuging

b) concentration of colloidal and suspended solids after sedimentation

c) intensity of light scattered when light is passed through

d) difference in suspended solid concentration before and after filtration

10 / 30

10. Which traps have parallel legs?

a) P-Trap

b) Q-Trap

c) gully trap

d) S-Trap

11 / 30

11. Scour valves are provided

a) at every summit of rising mains

b) at very depression and dead ends to drain out the waste water that may collect there

c) at street corners to control the flow of water

d) all of the above

12 / 30

12. 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

13 / 30

13. The SODIS method of water purification is a process of:

a) Chlorination

b) Solar disinfection

c) System of disinfected integral supply

d) Supply of disinfected and improved water system

14 / 30

14. The per capita consumption of a locality is affected by

a) climatic condition

b) quality of water

c) distribution pressure

d) all of the above

15 / 30

15. The most commonly used coagulant is:

a) Alum

b) Lime

c) Chlorine

d) Bleaching powder

16 / 30

16. Imhoff tank is a:

a) one-storey sedimentation tank

b) two-storey sedimentation tank

c) three-storey sedimentation tank

d) four-storey sedimentation tank

17 / 30

17. Goitre is due to

a) chlorine

b) bromine

c) iodine

d) all of the above

18 / 30

18. The specific gravity of sewage is:

a) equal to 1

b) slightly less than 1

c) slightly more than 1

d) none of the above

19 / 30

19. The maximum diameter of a sewer pipe should preferably be:

a) 100 cm

b) 200 cm

c) 300 cm

d) 450 cm

20 / 30

20. Gravity water supply system starts from

a) intake

b) collection chamber

c) BPT

d) faucet

21 / 30

21. Excess concentration of sodium salts in water causes

a) hardness

b) bitter taste

c) alkalinity

d) laxative effect

22 / 30

22. The relation between porosity, specific yield, and specific retention is given by

a) porosity = specific yield + specific retention

b) porosity = specific yield - specific retention

c) specific yield = porosity + specific retention

d) none of the above

23 / 30

23. The disinfection efficiency of chlorination

a) increases with the temperature of water

b) decreases with the temperature of water

c) not affected by temperature

d) none of the above

24 / 30

24. 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

25 / 30

25. As compared to shallow tube wells, deep wells have

a) more depth

b) less depth

c) more discharge

d) less discharge

26 / 30

26. 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

27 / 30

27. Two sewer sections laid at the same grade will be hydraulically equivalent if:

a) their discharge capacity when running full is equal

b) their flow velocity when running full is equal

c) their flowing areas when running full are equal

d) all the above factors are equal

28 / 30

28. Size of colloidal particles present in water is

a) 10 to 10^-1 mm

b) 10^-1 to 10^-3 mm

c) 10^-3 to 10^-6 mm

d) 10^-6 to 10^-9 mm

29 / 30

29. Dengue is termed as which type of disease?

a) Waterborne

b) Water washed

c) Water based

d) Water related

30 / 30

30. The valve provided at low points of the pipe to drain off water quickly under gravity is

a) drain valve

b) blow-off valve

c) sewer valve

d) all of the above

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Water Supply & Sanitation Engineering Online Test – Paper 2

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