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 quantity of flushing water required for pour-flush water seal latrine is:

a) 0.5-1.5 litres

b) 1.5-2.0 litres

c) 2.0-3.0 litres

d) 3.0-4.0 litres

2 / 30

2. The specific retention is least in the soil type

a) coarse gravel

b) sand

c) clay

d) silt

3 / 30

3. 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

4 / 30

4. The pipe joint commonly used in a pumping station is

a) flexible joint

b) expansion joint

c) flanged joint

d) socket and spigot joint

5 / 30

5. A circular section for a sewer is preferred only up to a diameter of:

a) 10 cm

b) 20 cm

c) 30 cm

d) 60 cm

6 / 30

6. 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

7 / 30

7. The type of joint used in HDP pipe is

a) butt welding

b) solvent welding

c) thread joint

d) dresser coupling joint

8 / 30

8. If the head of water is more than 100 m then the type of pipe used is

a) plastic

b) HDP

c) GI

d) PVC

9 / 30

9. 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

10 / 30

10. For a 150mm diameter sewer, the gradient required to generate self-cleaning velocity is:

a) 1 in 10

b) 1 in 100

c) 1 in 200

d) 1 in 300

11 / 30

11. The common pipe used in house plumbing is:

a) PVC

b) HDPE

c) GI

d) CI

12 / 30

12. 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%

13 / 30

13. The amount of BOD in domestic water should be

a) 1 ppm

b) 2 ppm

c) 3 ppm

d) nil

14 / 30

14. Detention time for the detritus tank is:

a) 1-2 minutes

b) 2-3 minutes

c) 3-4 minutes

d) 4-5 minutes

15 / 30

15. The design discharge for the combined system shall be taken equal to:

a) rainfall

b) rainfall + dry weather flow

c) rainfall + 2× dry weather flow

d) rainfall + 4× dry weather flow

16 / 30

16. 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

17 / 30

17. A source of colour in water is due to

a) silt

b) clay

c) organic debris

d) inorganic inert matter

18 / 30

18. The working conditions in imhoff tanks are:

a) aerobic only

b) anaerobic only

c) aerobic in the lower and anaerobic in the upper compartment

d) anaerobic in the lower and aerobic in the upper compartment

19 / 30

19. The characteristics of fresh and septic sewage are:

a) alkaline and acidic

b) acidic and alkaline

c) acidic and acidic

d) alkaline and alkaline

20 / 30

20. During the water test of sewer, 2 lit/cm of dia/km of sewer line may be allowed for a period of:

a) 5 minutes

b) 30 minutes

c) 15 minutes

d) 20 minutes

21 / 30

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

a) breakdown reserve

b) fire reserve

c) all of the above

d) balancing reserve

22 / 30

22. 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

23 / 30

23. An advantage of the intermittent system of the water supply system:

a) Repairs can be carried out during non-supply hours

b) Chances of wastage of water are less

c) Less quantity of water is used

d) All of the above

24 / 30

24. The gradient of a sewer is:

a) given in the direction of the natural slope of the ground

b) given in the opposite direction of the natural slope of the ground

c) zero

d) more than 1 in 20

25 / 30

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

a) Air

b) Vacuum

c) Pressure

d) Gravity

26 / 30

26. For areas of distributed rainfall throughout the year with less intensity, the suitable system of sanitation is:

a) separate system

b) combined system

c) partially separate system

d) partially combined system

27 / 30

27. 2 ml of sewage, having BOD-500 mg/l, is diluted to 200 ml, and incubated for 5 days at 20°C. If the D.O. content after 5 days is found to be 5 mg/l, what was the initial D.O. content of the diluted sample?

a) 10 mg/l

b) 5 mg/l

c) 1 mg/l

d) none of the above

28 / 30

28. Absolutely soft waters are required for

a) drinking

b) boilers

c) prevention of corrosion in pipes

d) washing with synthetic detergent soap

29 / 30

29. Sewer has to bear:

a) internal pressure of sewage

b) temperature stresses

c) forces due to external loads

d) all of the above

30 / 30

30. 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

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