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. In distribution pipes, drain valves are provided at

a) lower point

b) higher point

c) junction points

d) anywhere

2 / 30

2. Sewerage system is designed for:

a) maximum flow only

b) minimum flow only

c) average flow only

d) maximum and minimum flow

3 / 30

3. A sewer that collects sewage from toilets is called:

a) lateral sewer

b) branch sewer

c) main sewer

d) outfall sewer

4 / 30

4. The object of cowl is to:

a) give an ornamental look

b) prevent the entry of rainfall into the waste pipe

c) quickly dispel foul gases

d) prevent nest building

5 / 30

5. The ratio of maximum to average sewage flow for mains up to 1 m in diameter is usually:

a) 1.0

b) 1.2

c) 1.5

d) 2.0

6 / 30

6. Factors considered in the selection of the site for the intake point are that it should be

a) nearer to the treatment plant

b) in the pure zone of the water source

c) upstream of the point of disposal of wastewater

d) all of the above

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. 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

9 / 30

9. Corrosion of well pipes can be reduced by:

a) using thicker pipes

b) reducing the flow velocity

c) reducing the draw dawn

d) all of the above

10 / 30

10. Coefficient of permeability is maximum for

a) clean gravel

b) clay

c) fine sand

d) silt

11 / 30

11. 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

12 / 30

12. Air inlet valve is provided in water mains at

a) summit of the pipe

b) downstream of the sluice valve

c) both (a) and (b) of the above

d) upstream of the sluice valve

13 / 30

13. Baffle wall in septic tank is:

a) Short side wall

b) Long side wall

c) Honeycomb inner wall

d) None of the above

14 / 30

14. 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

15 / 30

15. Turbidity depends on the presence of the following in water

a) suspended solids

b) suspended solids and colloidal solids

c) any material capable of preventing light

d) intensity of coloration

16 / 30

16. The aquifer having the least water-bearing capacity is

a) confined

b) unconfined

c) perched

d) none of the above

17 / 30

17. In order to consider temperature changes, metal pipes are usually provided with

a) expansion joints

b) contraction joints

c) anchorages

d) pressure relief valves

18 / 30

18. Sewer which gets discharge from two or more main sewers is called:

a) main sewer

b) trunk sewer

c) combined sewer

d) intercepting sewer

19 / 30

19. Turbidity is undesirable because it

a) renders waters unpalatable

b) affects photosynthesis of aquatic life

c) causes milky unite coloration to water

d) causes red and brown stains

20 / 30

20. The last trap provided in a house drainage system is:

a) q-trap

b) floor trap

c) nahni trap

d) interception trap

21 / 30

21. A sewer, which gets its flow from a number of transverse sewers, is known as:

a) interceptor

b) interconnector

c) head sewer

d) branch sewer

22 / 30

22. 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

23 / 30

23. 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

24 / 30

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

a) 300

b) 400

c) 500

d) 550

25 / 30

25. Iron and manganese are estimated by

a) jar test

b) winkler test

c) calorimetric test

d) none of the above

26 / 30

26. 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

27 / 30

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

a) dilution

b) oxygen reduction

c) sunlight

d) all of the above

28 / 30

28. The main function of a manhole is:

a) cleaning of sewer

b) inspection of sewer

c) joining different types of sewer

d) joining different grade of sewer

29 / 30

29. The approximate diameter of a water mains for supplying 7.15 mld with 1.21 m/sec velocity flow will be

a) 10 cm

b) 20 cm

c) 30 cm

d) 50 cm

30 / 30

30. Harmful bacteria are called:

a) Parasites

b) Anaerobic bacteria

c) Aerobic bacteria

d) Pathogens

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