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. Excess concentration of magnesium salts in water causes

a) hardness

b) bitter taste

c) alkalinity

d) laxative effect

2 / 30

2. Baffle wall in septic tank is:

a) Short side wall

b) Long side wall

c) Honeycomb inner wall

d) None of the above

3 / 30

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

a) breakdown reserve

b) fire reserve

c) all of the above

d) balancing reserve

4 / 30

4. Service connections to consumer houses are generally provided with

a) copper pipes

b) PVC pipes

c) galvanized pipes

d) cast iron pipes

5 / 30

5. Anti-siphonage pipe is connected to:

a) Top of PWC

b) Bottom of PWC

c) In the main pipe

d) None of the above

6 / 30

6. Sewer has to bear:

a) internal pressure of sewage

b) temperature stresses

c) forces due to external loads

d) all of the above

7 / 30

7. The maximum pressure which the pipe can withstand without any leakage during the hydrostatic pressure test is called

a) working pressure

b) test pressure

c) design pressure

d) none of the above

8 / 30

8. The types of pump suitable for water as well as sewage

a) rotary pump

b) centrifugal pump

c) reciprocating pump

d) impulse pump

9 / 30

9. Following material is used during drilling to prevent caving

a) bentonite

b) thixotropy

c) both (a) and (b) above

d) none of the above

10 / 30

10. Sluice valves in main water supplies are

a) used to regulate the flow

b) spaced about 5 km apart

c) generally provided at the summits

d) all of the above

11 / 30

11. Surface water is obtained from

a) well

b) spring

c) artesian well

d) rain

12 / 30

12. The pattern of sanitation most suitable for a sloppy area is:

a) zone pattern

b) fan pattern

c) radial pattern

d) perpendicular pattern

13 / 30

13. 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

14 / 30

14. Alum increases

a) hardness of water

b) carbonate of water

c) sulphate of water

d) acidity of water

15 / 30

15. The water supply system whose main, sub-main, and branches are interconnected with each other is:

a) dead-end system

b) grid iron system

c) ring system

d) radial system

16 / 30

16. 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

17 / 30

17. Sewage is treated by aerobic bacteria action in:

a) septic tank

b) settling tank

c) trickling filter

d) oxidation pond

18 / 30

18. Purest water may have

a) no colour

b) faint blue-green colour

c) dark blue colour

d) brownish-yellow colour

19 / 30

19. If 10 ml of raw sewage is diluted to 250 ml, and the dissolved oxygen content of the diluted sample changes from 9 mg/l to 5 mg/l after incubation at 20°C. for 5 days, BODs of raw sewage is:

a) 0.16 mg/l

b) 4 mg/l

c) 10 mg/l

d) 100 mg/l

20 / 30

20. Which traps have curved legs?

a) P-Trap

b) Q-Trap

c) gully trap

d) S-Trap

21 / 30

21. The radius of influence of the well varies with

a) rate of pumping

b) water table

c) types of well

d) none of the above

22 / 30

22. Pick up the correct statement:

a) If PH<7 then sewage is acidic

b) If PH>7 then sewage is alkaline

c) If PH=7 the sewage is neutral

d) all of the above

23 / 30

23. Groundwater is generally free from

a) suspended impurities

b) dissolved impurities

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

d) none of the above

24 / 30

24. Manhole is said to be deep if its depth is more than:

a) 1.5 m

b) 1.70 m

c) 1.9 m

d) 2.1 m

25 / 30

25. The minimum size of a fire hydrant is:

a) 5 cm

b) 10 cm

c) 15 cm

d) 50 cm

26 / 30

26. The gradient to be provided for sewers depends upon:

a) the diameter of the sewer

b) the discharge

c) sewer pipe material

d) all of the above

27 / 30

27. Turbidity of water sample depends on

a) concentration and density of suspended and colloidal solids

b) concentration of suspended, colloidal, and dissolved solids

c) concentration of organic and inorganic matter

d) concentration, size, shape, and refractive index of suspended solids

28 / 30

28. 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

29 / 30

29. Turbidity for domestic water is undesirable because it

a) is unaesthetic

b) causes change of taste

c) gives apparent colour

d) none of the above

30 / 30

30. 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

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