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 average discharge of a tube-well is about

a) 5 liters/sec

b) 50 liters/sec

c) 100 liters/sec

d) 500 liters/sec

2 / 30

2. Physical characteristics of sewage include:

a) Turbidity

b) Color

c) Odor

d) All of the above

3 / 30

3. 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

4 / 30

4. Drop manholes are provided on sewers in:

a) hilly towns

b) plain towns

c) manholes are deep

d) none of the above

5 / 30

5. Where manholes shall be installed in a sewer system?

a) At the middle of each line

b) At all intersections, changes in grade, size, alignment

c) At ends of a curvilinear sewer

d) At distances not greater than 50m

6 / 30

6. 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

7 / 30

7. 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

8 / 30

8. Normally the shape of the demand line is

a) straight

b) curved

c) both of the above

d) none of the above

9 / 30

9. As compared to cast iron pipes, steel pipes are

a) stronger

b) heavier

c) costlier

d) all of the above

10 / 30

10. The capacity of a flushing cistern for water closets is:

a) 1-2 liters

b) 10-15 liters

c) 5 liters

d) 20-25 liters

11 / 30

11. The devices installed for drawing water from the sources are called

a) filters

b) intakes

c) aquifers

d) none of the above

12 / 30

12. 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

13 / 30

13. Before entering a manhole, a candle is lowered into the manhole:

a) to illuminate it

b) to detect toxic gases

c) to give a signal to the adjacent manhole

d) to find out the presence of oxygen

14 / 30

14. 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

15 / 30

15. The suitable system of sanitation for an area having rainfall for only one season is:

a) separate system

b) combined system

c) partially combined system

d) all of the above

16 / 30

16. Surface water is obtained from

a) well

b) spring

c) artesian well

d) rain

17 / 30

17. The common pipe used in house plumbing is:

a) PVC

b) HDPE

c) GI

d) CI

18 / 30

18. 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

19 / 30

19. The pipe used to carry discharge from sanitary fittings like bathrooms, kitchens, etc., is:

a) waste pipe

b) soil pipe

c) vent pipe

d) anti-siphonage pipe

20 / 30

20. Steel pipes are

a) generally laid underground and no expansion joint is required

b) connected by riveted or welded joints

c) suitable for withstanding high internal pressure

d) all of the above

21 / 30

21. Baffle wall in septic tank is:

a) Short side wall

b) Long side wall

c) Honeycomb inner wall

d) None of the above

22 / 30

22. In strainer type wells

a) the flow is radial

b) the flow is spherical

c) area of flow depends upon the size of the cavity

d) all of the above

23 / 30

23. A heavy metal having non-toxic property

a) lead

b) copper

c) zinc

d) silver

24 / 30

24. The ratio of maximum hourly consumption and average hourly consumption of the maximum day is

a) 1.2

b) 1.5

c) 1.8

d) 2.7

25 / 30

25. The open channels supported above the ground over trestles are called

a) tunnel

b) aqueduct

c) flume

d) conduit

26 / 30

26. Abbreviation which is correct?

a) TOC (Total Organic Carbon)

b) ThOD (Theoretical Oxygen Demand)

c) TOD (Total Oxygen Demand)

d) all of the above

27 / 30

27. Water to the consumers may be supplied from

a) rainy wells sunk to the water level

b) infiltration well dug out on the banks of rivers

c) infiltration galleries connected to a sump well

d) all of the above

28 / 30

28. Disinfection of water involves.....

a) killing of diseases bacteria

b) produce of diseases of water

c) no change diseases bacteria

d) none of the above

29 / 30

29. Abyssinian tube well is a special type of

a) strainer type tube well

b) cavity type tube well

c) slotted type tube well

d) perforated type tube well

30 / 30

30. 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

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