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. The water supply demand in a day school without a boarder should be

a) 10 lpcd

b) 20 lpcd

c) 30 lpcd

d) 40 lpcd

2 / 30

2. Sanitary sewage means:

a) domestic sewage

b) industrial sewage

c) both (a) and (b) above

d) none of the above

3 / 30

3. Strainer type tube wells are considered unsuitable for

a) coarse gravel

b) fine sand strata

c) clean gravels

d) all of the above

4 / 30

4. The sewage consists of water:

a) 80%

b) 90%

c) 95%

d) 99.9%

5 / 30

5. PH value of water for water supply

a) 6.5 to 8.5

b) 5.5 to 7.0

c) 7.0 to 9.5

d) 5.5 to 9.5

6 / 30

6. Self-purification of natural streams is caused due to

a) dilution

b) oxygen reduction

c) sunlight

d) all of the above

7 / 30

7. Where it is not possible to obtain self-cleansing velocities for sewers, flush are provided with the minimum available head of:

a) 1-3 m

b) 3-5 m

c) 5-7 m

d) 7-10 m

8 / 30

8. Sterilization is the process of

a) killing of diseases bacteria

b) produce of diseases of water

c) no change diseases bacteria

d) eliminating all life

9 / 30

9. The layout of the distribution system that is suitable for haphazardly growing cities is:

a) dead-end system

b) grid iron system

c) ring system

d) radial system

10 / 30

10. If 10 ml of raw sewage is diluted to 250 ml, the dilution factor is:

a) 24

b) 25

c) 1/25

d) none of the above

11 / 30

11. 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

12 / 30

12. The amount of BOD in domestic water should be

a) 1 ppm

b) 2 ppm

c) 3 ppm

d) nil

13 / 30

13. 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

14 / 30

14. If 10 ml of raw sewage is diluted to 250 ml, and the dissolved oxygen content of the diluted sample changes from 9 mg/l to 5 mg/l after incubation at 20°C. for 5 days, BODs of raw sewage is:

a) 0.16 mg/l

b) 4 mg/l

c) 10 mg/l

d) 100 mg/l

15 / 30

15. Septic tank effluent is:

a) quite clear and sparkling

b) always odorless

c) having fine organic solids with high BOD

d) black tarry liquor with an earthy odor

16 / 30

16. The valve which allows water to flow in one direction but prevents its flow in the reverse direction is

a) reflux valve

b) gate valve

c) sluice valve

d) pressure valve

17 / 30

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

a) 300

b) 400

c) 500

d) 550

18 / 30

18. Water demand for public use as compared to the total demand, kept in the design of waterworks for a city, is

a) 5%

b) 10%

c) 20%

d) 25%

19 / 30

19. The minimum water flow in a tap stand is:

a) 0.25 lps

b) 0.20 lps

c) 0.15 lps

d) 0.10 lps

20 / 30

20. The average discharge of a tube-well is about

a) 5 liters/sec

b) 50 liters/sec

c) 100 liters/sec

d) 500 liters/sec

21 / 30

21. Pipes for water supply are tested for

a) pressure

b) leakage

c) dimensions

d) all of the above

22 / 30

22. By boiling water, hardness can be removed if it is due to:

a) Calcium sulphate

b) Magnesium sulphate

c) Calcium nitrate

d) Calcium bicarbonate

23 / 30

23. The bacteria which can survive with or without oxygen is known as...

a) aerobic bacteria

b) anaerobic bacteria

c) facultative bacteria

d) none of the above

24 / 30

24. A heavy metal having non-toxic property

a) lead

b) copper

c) zinc

d) silver

25 / 30

25. B-coli tests are conducted to serve as a

a) very good indicator of pathogenic bacteria

b) very good indicator of acidity

c) very good indicator of alkalinity

d) means of detecting turbidity

26 / 30

26. 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

27 / 30

27. 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

28 / 30

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

a) 1

b) 2

c) 3

d) 4

29 / 30

29. Inverted siphon is called:

a) special sewer

b) general sewer

c) storm sewer

d) none of the above

30 / 30

30. Break pressure tank is generally provided in rural water supply schemes if static head exceeds

a) 30 m

b) 40 m

c) 50 m

d) 60 m

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