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

a) main sewer

b) trunk sewer

c) combined sewer

d) intercepting sewer

2 / 30

2. 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

3 / 30

3. Priming is the process of

a) removing the trapped air from the pump

b) removing the trapped water from the pump

c) removing the debris waste from the pump

d) all of the above

4 / 30

4. The water collected for the sample from the

a) 10-20 cm below from the surface

b) 20-30 cm below from the surface

c) 30-40 cm below from the surface

d) 40-50 cm below from the surface

5 / 30

5. The depression of the water table in a well due to pumping will be maximum

a) at a distance r from the well

b) at a distance r/2 from the well

c) close to the well

d) none of the above

6 / 30

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

a) 5 cm

b) 10 cm

c) 15 cm

d) 25 cm

7 / 30

7. The SODIS method of water purification is a process of:

a) Chlorination

b) Solar disinfection

c) System of disinfected integral supply

d) Supply of disinfected and improved water system

8 / 30

8. The colour of water is measured on the platinum cobalt scale with the help of

a) thermometer

b) tintometer

c) turbidity meter

d) barometer

9 / 30

9. Merit of water carriage sewage system:

a) no human agency is involved in this system

b) no problem of foul smell or hygienic trouble

c) less area is required

d) all of the above

10 / 30

10. Sewer has to bear:

a) internal pressure of sewage

b) temperature stresses

c) forces due to external loads

d) all of the above

11 / 30

11. 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

12 / 30

12. The factor for the selection of the pumping station site is

a) distance of the source of contamination or pollution

b) height above the H.F.L. of the river

c) future expansion

d) all of the above

13 / 30

13. When more than two sewers join in a manhole:

a) their tops should be at the same level

b) their centers should be at the same level

c) their bottoms should be at the same level

d) they can be either way

14 / 30

14. Any trap is intended to trap foul gases with the provision of:

a) clear seal

b) sewage or sullage

c) otta seal

d) water seal

15 / 30

15. Groundwater is generally free from

a) suspended impurities

b) dissolved impurities

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

d) none of the above

16 / 30

16. Source of water in the mountains is:

a) tube well

b) well

c) stream

d) none of the above

17 / 30

17. Dengue is termed as which type of disease?

a) Waterborne

b) Water washed

c) Water based

d) Water related

18 / 30

18. Velocity of flow through a grit chamber is:

a) 30 to 60 cm/sec

b) 30 to 60 cm/min

c) 15 to 45 cm/sec

d) 15 to 45 cm/min

19 / 30

19. In Chezy's formula v=c√ms for calculating the velocity of flow in a circular sewer, the Chezy's constant c depends upon:

a) size of the sewer

b) shape of the sewer

c) roughness of the sewer

d) all of the above

20 / 30

20. Pipes for water supply are tested for

a) pressure

b) leakage

c) dimensions

d) all of the above

21 / 30

21. If Q is discharge in cubic meters per second and D is the economical diameter of the pipe, then according to Lea

a) D = 0.67 to 0.87 √Q

b) D = 0.67 to 0.97 √Q

c) D = 0.97 to 1.22 √Q

d) D = 1.22 to 1.32 √Q

22 / 30

22. 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

23 / 30

23. Turbidity can be removed by

a) coagulation and filtration

b) aeration and sedimentation

c) activated carbon adsorption

d) disinfections

24 / 30

24. Lead in water causes

a) plumbo solvency

b) stains on clothes and paper

c) damages water systems

d) permanent bluish skin

25 / 30

25. 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

26 / 30

26. The minimum water flow in a tap stand is:

a) 0.25 lps

b) 0.20 lps

c) 0.15 lps

d) 0.10 lps

27 / 30

27. The type of joint used in HDP pipe is

a) butt welding

b) solvent welding

c) thread joint

d) dresser coupling joint

28 / 30

28. Mass action' during sedimentation is the property of:

a) decrease in mass of sludge

b) settling of a particle along with the neighboring particle

c) quick spreading of floc

d) increase in mass of sludge

29 / 30

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

a) tunnel

b) aqueduct

c) flume

d) conduit

30 / 30

30. An aquiclude is

a) a non-artesian aquifer

b) a large underground water body

c) a confined bed of impervious material between aquifers

d) an artesian aquifer

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Water Supply & Sanitation Engineering Online Test – Paper 2

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