Water Supply & Sanitation Engineering Online Test – Paper 2

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Vikash chaudhary

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Total Questions: 30
Time Allotted: 30 minutes
Passing Score: 50%
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Certificate: No
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1 / 30

1. Which type of distribution system will you follow if the reduced level of the source of water is 100 m while the reduced level of the town is 50 m?

a) gravity system

b) pumping system

c) dual system

d) none of the above

2 / 30

2. The sewerage system originates from:

a) main sewers

b) branch sewers

c) lateral sewers

d) house sewers

3 / 30

3. With the increase in the size of the water pipe, the permissible velocity (If discharge is constant)

a) decreases

b) increases

c) remains constant

d) none of the above

4 / 30

4. Coefficient of permeability is maximum for

a) clean gravel

b) clay

c) fine sand

d) silt

5 / 30

5. Purest water may have

a) no colour

b) faint blue-green colour

c) dark blue colour

d) brownish-yellow colour

6 / 30

6. 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

7 / 30

7. 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

8 / 30

8. Selection of material for the pipe depends on

a) carrying capacity of the pipe

b) durability and life of the pipe

c) effect of water to be conveyed on the pipe material

d) all of the above

9 / 30

9. Advantage of pressure conduits is

a) flow is independent of the grade of the hydraulic grade line

b) economical since it follows a shorter path

c) less chance of water pollution as it is closed

d) all of the above

10 / 30

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

a) dilution

b) oxygen reduction

c) sunlight

d) all of the above

11 / 30

11. The best sewer material to resist hydrogen sulfide corrosion is:

a) RCC

b) brick masonry

c) glazed stoneware

d) asbestos cement

12 / 30

12. Following material is used during drilling to prevent caving

a) bentonite

b) thixotropy

c) both (a) and (b) above

d) none of the above

13 / 30

13. Water of zero hardness is obtained by

a) boiling

b) lime-soda process

c) base exchange process

d) none of the above

14 / 30

14. 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

15 / 30

15. An egg-shaped section of sewer:

a) is economical than a circular section

b) is more stable than a circular section

c) provides self-cleansing velocity at low discharge

d) all of the above

16 / 30

16. Abbreviation which is correct?

a) TOC (Total Organic Carbon)

b) ThOD (Theoretical Oxygen Demand)

c) TOD (Total Oxygen Demand)

d) all of the above

17 / 30

17. At the socket and spigot joint,

a) the enlarged end of the pipe is called a socket

b) the normal end of the pipe is called a spigot

c) the spigot is fitted into the socket

d) all of the above

18 / 30

18. 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

19 / 30

19. For separate and partially separate systems, the pattern of collection suitable is:

a) perpendicular pattern

b) interceptor pattern

c) radial pattern

d) fan pattern

20 / 30

20. The most dangerous metal for human health is

a) zinc

b) copper

c) lead

d) iron

21 / 30

21. Designation of GI pipe is done with:

a) internal diameter

b) external diameter

c) center line

d) none of the above

22 / 30

22. The term "septic" refers to.....?

a) Anaerobic bacterial environment that develops in the tank

b) Refers to safety and precaution

c) Drainage of waste materials

d) Aerobic bacterial environment that develops in the tank

23 / 30

23. The sewage in an inverted siphon will flow under what condition?

a) Air

b) Vacuum

c) Pressure

d) Gravity

24 / 30

24. Pressure relief valve is provided in the water main

a) to reduce the pressure

b) upstream of the sluice

c) at the low point

d) all of the above

25 / 30

25. PVC pipes can withstand pressure up to

a) 20 m head of water

b) 50 m head of water

c) 100 m head of water

d) 150 m head of water

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. If D is the diameter of the upper circular portion, the overall depth of a standard egg-shaped section, is:

a) D

b) 1.2D

c) 1.5D

d) 2D

28 / 30

28. If in the relative stability test on sewage, the period of incubation at 20°C is 15 days, the relative stability is:

a) 95.95%

b) 96.05%

c) 96.86%

d) 100%

29 / 30

29. The water which is not chemically pure but does not contain anything harmful to human health is known as

a) pure water

b) wholesome water

c) polluted water

d) none of the water

30 / 30

30. The ratio of the maximum daily consumption to the average demand is

a) 1.2

b) 1.5

c) 1.8

d) 2.7

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Water Supply & Sanitation Engineering Online Test – Paper 2

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