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 pump does not require any power, energy, fuel, etc., for its working is

a) centrifugal

b) hydraulic ram

c) reciprocating

d) rotary

2 / 30

2. Computation of discharges is difficult for:

a) dead-end system

b) grid iron system

c) ring system

d) radial system

3 / 30

3. In the partially ventilated single-stack system of plumbing, the number of vertical pipes is:

a) 1

b) 2

c) 3

d) 4

4 / 30

4. Groundwater is generally free from

a) suspended impurities

b) dissolved impurities

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

d) none of the above

5 / 30

5. The specific retention is least in the soil type

a) coarse gravel

b) sand

c) clay

d) silt

6 / 30

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

a) 1.2

b) 1.5

c) 1.8

d) 2.7

7 / 30

7. Break pressure tank in a water supply system is incorporated to:

a) Store water under pressure

b) Treat water by adequate pressure

c) Release the pressure generated in the pipe

d) Break the pressure

8 / 30

8. 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

9 / 30

9. 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

10 / 30

10. In water analysis, the test carried out is

a) physical

b) chemical

c) biological

d) all of the above

11 / 30

11. The self-cleaning velocity normally adopted for a sewer is:

a) less than 1 m/sec

b) 1.0 m/sec to 1.2 m/sec

c) 1.5 m/sec to 1.2 m/sec

d) more than 2.0 m/sec

12 / 30

12. When the fall in elevation is greater than 60cm, the manhole provided is called:

a) lamp hole

b) flight manhole

c) drop manhole

d) fall manhole

13 / 30

13. 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

14 / 30

14. The pipe used to carry discharge from sanitary fittings like bathrooms, kitchens, etc., is:

a) waste pipe

b) soil pipe

c) vent pipe

d) anti-siphonage pipe

15 / 30

15. Flush air inlets are sometimes called:

a) ventilated lamp holes

b) well hole

c) clean outs

d) flushing tank

16 / 30

16. Harmful bacteria are called:

a) Parasites

b) Anaerobic bacteria

c) Aerobic bacteria

d) Pathogens

17 / 30

17. Stoneware pipes are generally not used for sewer mains because they are:

a) weak in compression

b) weak in tension

c) hydraulically less efficient

d) less resistant to organic corrosion

18 / 30

18. The types of formwork provided for ferrocement tank in rural water supply schemes are

a) steel

b) wood

c) HDP pipe

d) all of the above

19 / 30

19. "Puits developee" is generally provided in case of

a) well

b) tube well

c) reservoir

d) none of the above

20 / 30

20. Sewer has to bear:

a) internal pressure of sewage

b) temperature stresses

c) forces due to external loads

d) all of the above

21 / 30

21. In the two-pipe system of plumbing, the number of vertical pipes is:

a) 1

b) 2

c) 3

d) 4

22 / 30

22. The type of joint used in HDP pipe is

a) butt welding

b) solvent welding

c) thread joint

d) dresser coupling joint

23 / 30

23. Minimum required residual head at the public tap stand is not less than

a) 15

b) 10

c) 5

d) 20

24 / 30

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

a) perpendicular pattern

b) interceptor pattern

c) radial pattern

d) fan pattern

25 / 30

25. Two sewer sections laid at the same grade will be hydraulically equivalent if:

a) their discharge capacity when running full is equal

b) their flow velocity when running full is equal

c) their flowing areas when running full are equal

d) all the above factors are equal

26 / 30

26. Letache is observed in:

a) septic tank

b) sewage

c) landfill

d) none of the above

27 / 30

27. Grit is:

a) inert matter of specific gravity > 2.65

b) organic matter of specific gravity nearer to 1

c) organic and inert matter combined

d) colloidal matter of heavy specific gravity

28 / 30

28. The minimum height of a flushing cistern is:

a) 1 m

b) 2 m

c) 3 m

d) 5 m

29 / 30

29. Following material is used during drilling to prevent caving

a) bentonite

b) thixotropy

c) both (a) and (b) above

d) none of the above

30 / 30

30. Sickness of tube well indicates

a) increase in well

b) reduction in yield

c) suffering from waterborne disease

d) all of the above

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