Water Supply & Sanitation Engineering Online Test

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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. Sterilized water is generally used for

a) domestic

b) medical

c) public

d) all of the above

2 / 30

2. Absolutely soft waters are required for

a) drinking

b) boilers

c) prevention of corrosion in pipes

d) washing with synthetic detergent soap

3 / 30

3. The detention time in a septic tank is usually:

a) 1-2 hours

b) 5-6 hours

c) 18-24 hours

d) 22-24 hours

4 / 30

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

a) chlorides

b) sulphates

c) nitrates

d) phosphates

5 / 30

5. Normally the shape of the demand line is

a) straight

b) curved

c) both of the above

d) none of the above

6 / 30

6. Septic tank is provided for:

a) To eliminate the sewer system

b) Tank for sedimentation cum disposal under aerobic conditions

c) Oxygen-free sedimentation cum disposal under anaerobic conditions

d) None of the above

7 / 30

7. The slope of the hydraulic grade line is always towards the well due to pumping. This line of depressed water table is called

a) drawdown curve

b) circle of influence

c) dynamic gradient

d) an inverted cone of depression

8 / 30

8. Designation of GI pipe is done with:

a) internal diameter

b) external diameter

c) center line

d) none of the above

9 / 30

9. Goaty water refers to...

a) odour of water

b) turbidity of water

c) colour of water

d) all of the above

10 / 30

10. When the fall in elevation is greater than 60cm, the manhole provided is called:

a) lamp hole

b) flight manhole

c) drop manhole

d) fall manhole

11 / 30

11. The highest non-scouring velocity in a sewer may be allowed in:

a) cast iron sewer

b) glazed brick sewer

c) cement concrete

d) stone ware sewer

12 / 30

12. The capacity of Guheswari STP is:

a) 15.4 Mld

b) 1.1 Mld

c) 0.50 Mld

d) 12.1 Mld

13 / 30

13. A water supply system is said to be continuous when it is supplied for:

a) 6 hrs

b) 12 hrs

c) 18 hrs

d) 24 hrs

14 / 30

14. A structure constructed where self-cleaning velocity is not developed to prevent choking is called:

a) catch basin

b) flushing tank

c) manhole

d) inverted siphon

15 / 30

15. 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

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 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

18 / 30

18. Harmful bacteria are called:

a) Parasites

b) Anaerobic bacteria

c) Aerobic bacteria

d) Pathogens

19 / 30

19. The pattern of sanitation most suitable for a sloppy area is:

a) zone pattern

b) fan pattern

c) radial pattern

d) perpendicular pattern

20 / 30

20. 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

21 / 30

21. Aeration of water is done by

a) spray nozzles

b) cascading

c) trickling bed

d) all of the above

22 / 30

22. Which of the following impurities in water is removed by the sedimentation process?

a) total dissolved solids

b) bacteria

c) iron and manganese

d) suspended solids

23 / 30

23. A communicable disease is

a) cancer

b) fluorosis

c) tuberculosis

d) goitre

24 / 30

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

a) 300

b) 400

c) 500

d) 550

25 / 30

25. The types of pump suitable for water as well as sewage

a) rotary pump

b) centrifugal pump

c) reciprocating pump

d) impulse pump

26 / 30

26. Laying of a sewer is generally done with the help of:

a) sight rails and boning rod

b) theodolite and staff

c) leveling and staff

d) all of the above

27 / 30

27. Widely used pipe for rural water supply in Nepal is:

a) HDPE pipes

b) GI pipes

c) PVC pipes

d) CI pipes

28 / 30

28. Water for domestic consumption should be:

a) colorless, odorless & tasteless

b) free from dissolved salts

c) hygienically safe

d) attractive for looks

29 / 30

29. 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

30 / 30

30. The amount of BOD in domestic water should be

a) 1 ppm

b) 2 ppm

c) 3 ppm

d) nil

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