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. 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

2 / 30

2. 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

3 / 30

3. A tube well of 38cm diameter has depths before and after pumping at 10.7 m and 4.60, respectively. The coefficient of permeability is 2273 liters per day. If the radius of the circle of influence is 304.8m. The yield from the tube well will be

a) 500,00 liters per day

b) 600,00 liters per day

c) 750,00 liters per day

d) 900,00 liters per day

4 / 30

4. The color of septic sewage is:

a) grey

b) black

c) white

d) blue

5 / 30

5. Which one is correct?

a) Baylis turbidity meter is used to measure turbidity 0-20 PPM

b) Hellige turbidity meter is used to measure turbidity 0-50 PPM

c) Jackson turbidity meter is used to measure turbidity 50-1000 PPM

d) all of the above

6 / 30

6. Drop manholes are provided on sewers in:

a) hilly towns

b) plain towns

c) manholes are deep

d) none of the above

7 / 30

7. The most suitable excreta disposal unit for human excreta is:

a) Privy pit

b) Cesspool

c) Soak pit

d) None of the above

8 / 30

8. 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

9 / 30

9. The specific retention is least in the soil type

a) coarse gravel

b) sand

c) clay

d) silt

10 / 30

10. Depth of shallow tube well shall not be more than (considering economic point)

a) 30 m

b) 40 m

c) 50 m

d) 60 m

11 / 30

11. The minimum diameter of a sewer pipe should be:

a) 5 cm

b) 10 cm

c) 15 cm

d) 25 cm

12 / 30

12. Depth of shallow tube well shall not be more than (considering economic point):

a) 30 m

b) 40 m

c) 50 m

d) 60 m

13 / 30

13. Ovoid sewers are best suited for:

a) separate system

b) combined system with less fluctuations

c) combined system with very wide fluctuations

d) outfall sewer

14 / 30

14. Total quantity of reservoir is the sum of the following

a) breakdown reserve

b) fire reserve

c) all of the above

d) balancing reserve

15 / 30

15. Clean out is provided in the underground......sewer in place of manhole.

a) main sewer

b) trunk sewer

c) outfall sewer

d) lateral sewer

16 / 30

16. Traddle pump is operated by

a) hand

b) foot

c) electric

d) all of the above

17 / 30

17. The capacity of Guheswari STP is:

a) 15.4 Mld

b) 1.1 Mld

c) 0.50 Mld

d) 12.1 Mld

18 / 30

18. The fire demand of a city is generally calculated by

a) underwriters formula

b) freeman formula

c) kuichling's formula

d) all of the above

19 / 30

19. The valve provided on the suction pipe in a tube-well is

a) air relief valve

b) reflux valve

c) pressure

d) sluice valve

20 / 30

20. 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

21 / 30

21. 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

22 / 30

22. GI pipe coming from both sides is joined with a fitting called:

a) Tee

b) Union

c) Elbow

d) Socket

23 / 30

23. 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

24 / 30

24. The characteristics of fresh and septic sewage are:

a) alkaline and acidic

b) acidic and alkaline

c) acidic and acidic

d) alkaline and alkaline

25 / 30

25. The velocity of water in water mains of 40 cm diameter is usually kept

a) below 0.5 m/sec

b) below 5 m/sec

c) below 1.8 m/sec

d) below 18 m/sec

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. Most commonly used section in the grade aqueduct is

a) circular

b) rectangular

c) parabolic

d) all of the above

28 / 30

28. Water of zero hardness is obtained by

a) boiling

b) lime-soda process

c) base exchange process

d) none of the above

29 / 30

29. 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

30 / 30

30. Sluice valves in main water supplies are

a) used to regulate the flow

b) spaced about 5 km apart

c) generally provided at the summits

d) all of the above

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Water Supply & Sanitation Engineering Online Test – Paper 2

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