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. As the diameter of the sewer increases, the self-cleaning velocity:

a) increases

b) decreases

c) remains constant

d) depends on other factors

2 / 30

2. Impetus valve/waste valve is provided in

a) hydraulic ram

b) centrifugal pump

c) rotary pump

d) all of the above

3 / 30

3. Thrust blocks are installed wherever there is a

a) change in the direction or size of the pipeline

b) change in the pressure line diagram

c) pipeline ends at a dead end

d) all of the above

4 / 30

4. The types of sanitation in which urine and soil are separated are:

a) VIP latrine

b) septic tank

c) aqua privy

d) ecosanitation

5 / 30

5. 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

6 / 30

6. The commonly used material for water supply pipes having the property of not easily corroded, strong, long life but heavy and brittle is

a) steel

b) cast iron

c) wrought iron

d) RCC

7 / 30

7. 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

8 / 30

8. 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

9 / 30

9. Detention time for the detritus tank is:

a) 1-2 minutes

b) 2-3 minutes

c) 3-4 minutes

d) 4-5 minutes

10 / 30

10. The term "septic" refers to.....?

a) Anaerobic bacterial environment that develops in the tank

b) Refers to safety and precaution

c) Drainage of waste materials

d) Aerobic bacterial environment that develops in the tank

11 / 30

11. 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

12 / 30

12. Gravity conduits

a) carry water under gravity

b) follow the hydraulic gradient line

c) are carried through tunnels in deep cutting

d) all of the above

13 / 30

13. A communicable disease is

a) cancer

b) fluorosis

c) tuberculosis

d) goitre

14 / 30

14. 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

15 / 30

15. Growth of the population can be conveniently represented by

a) arithmetical curve

b) geographical curve

c) logistic curve

d) straight line curve

16 / 30

16. Most suitable section, when the maximum and minimum flow ratio is not much, is:

a) circular section

b) rectangular section

c) horse-shoe section

d) egg-shaped section

17 / 30

17. Computation of discharges is difficult for:

a) dead-end system

b) grid iron system

c) ring system

d) radial system

18 / 30

18. What will happen if an induction motor pump is run under significantly low voltage continually?

a) Less water is pumped

b) High energy will be consumed, increasing the energy bill

c) The motor will make loud noise

d) The motor will ultimately burn-out

19 / 30

19. 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

20 / 30

20. Odour is measured in terms of...

a) threshold number

b) reynold number

c) mach number

d) none of the above

21 / 30

21. With the increase in the size of the water pipe, the permissible velocity (If discharge is constant)

a) decreases

b) increases

c) remains constant

d) none of the above

22 / 30

22. Asbestos pipes are joined by means of

a) flanged joint

b) flexible joint

c) simplex joint

d) dresser coupling joint

23 / 30

23. The inlet and outlet pipes of the septic tank are bent:

a) upward

b) downward

c) inlet upward and outlet downward

d) inlet downward and outlet upward

24 / 30

24. Per capita water demand is calculated in liters

a) per person per day

b) per person per month

c) per person per year

d) none of the above

25 / 30

25. Turbidity is measured on..........

a) standard silica scale

b) standard cobalt scale

c) diagonal scale

d) none of the above

26 / 30

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

a) confined

b) unconfined

c) perched

d) none of the above

27 / 30

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

a) thermometer

b) tintometer

c) turbidity meter

d) barometer

28 / 30

28. Slow sand filter is efficient to remove bacteria from the raw water to an extent of:

a) 50%

b) 70%

c) 85%

d) 99%

29 / 30

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

a) 5 m

b) 10 m

c) 15 m

d) 20 m

30 / 30

30. Nahni trap is made of:

a) mud

b) cast iron

c) steel

d) all of the above

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