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%
Randomization: Yes
Certificate: No
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1 / 30

1. Turbidity can be removed by

a) coagulation and filtration

b) aeration and sedimentation

c) activated carbon adsorption

d) disinfections

2 / 30

2. A circular section of sewer has the advantage of:

a) least parameter for a given area

b) offers the least opportunities for deposits

c) more suitable when the discharge is approximately constant

d) all of the above

3 / 30

3. HGL should always be...... above the GL

a) 5 m

b) 10 m

c) 15 m

d) 20 m

4 / 30

4. Which traps have perpendicular legs?

a) P-Trap

b) Q-Trap

c) gully trap

d) S-Trap

5 / 30

5. In water analysis, the test carried out is

a) physical

b) chemical

c) biological

d) all of the above

6 / 30

6. 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

7 / 30

7. Kidney damage may be caused due to excess concentration of

a) fluorides

b) nitrates

c) chlorides

d) nitrites

8 / 30

8. Decrease in per capita consumption occurs by

a) use of a metering system

b) hot climate

c) good-quality water is supplied

d) all of the above

9 / 30

9. Septic tank effluent is:

a) quite clear and sparkling

b) always odorless

c) having fine organic solids with high BOD

d) black tarry liquor with an earthy odor

10 / 30

10. The sewer pipes:

a) carry sewage as gravity conduits

b) should resist the wear and tear caused due to abrasion

c) are designed for generating self-cleaning velocities at different discharge

d) all of the above

11 / 30

11. Flush air inlets are sometimes called:

a) ventilated lamp holes

b) well hole

c) clean outs

d) flushing tank

12 / 30

12. 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

13 / 30

13. 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

14 / 30

14. Poppet valve is a type of

a) air valve

b) blow-off valve

c) sluice valve

d) none of the above

15 / 30

15. The velocity of flow does not depend on:

a) grade of sewer

b) hydraulic mean depth of sewer

c) roughness of sewer

d) length of sewer

16 / 30

16. The amount of BOD in domestic water should be

a) 1 ppm

b) 2 ppm

c) 3 ppm

d) nil

17 / 30

17. 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

18 / 30

18. For an insignificant effect on the water table, the tube wells are spaced as one in every

a) 0.5 sq km

b) 1.0 sq km

c) 1.5 sq km

d) 2.0 sq km

19 / 30

19. PH value is a symbol for....material:

a) hydrogen

b) magnesium

c) calcium

d) sodium

20 / 30

20. Which traps have curved legs?

a) P-Trap

b) Q-Trap

c) gully trap

d) S-Trap

21 / 30

21. Before entering a manhole, a candle is lowered into the manhole:

a) to illuminate it

b) to detect toxic gases

c) to give a signal to the adjacent manhole

d) to find out the presence of oxygen

22 / 30

22. Which metal is good for keeping drinking water?

a) copper

b) brass

c) zinc

d) iron

23 / 30

23. B-coli tests are conducted to serve as a

a) very good indicator of pathogenic bacteria

b) very good indicator of acidity

c) very good indicator of alkalinity

d) means of detecting turbidity

24 / 30

24. Septic tanks are best suited for:

a) municipalities

b) industries

c) scattered residences

d) congested areas

25 / 30

25. 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

26 / 30

26. The valve provided after the pump in the rising mains to prevent the back flow of water when the pump is stopped is

a) air relief valve

b) reflux valve

c) sluice valve

d) all of the above

27 / 30

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

a) 300

b) 400

c) 500

d) 550

28 / 30

28. Turbidity is measured by the

a) concentration of suspended solids collected after centrifuging

b) concentration of colloidal and suspended solids after sedimentation

c) intensity of light scattered when light is passed through

d) difference in suspended solid concentration before and after filtration

29 / 30

29. 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

30 / 30

30. Traddle pump is operated by

a) hand

b) foot

c) electric

d) all of the above

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Water Supply & Sanitation Engineering Online Test – Paper 2

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