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. Absolutely soft waters are required for

a) drinking

b) boilers

c) prevention of corrosion in pipes

d) washing with synthetic detergent soap

2 / 30

2. Which traps have perpendicular legs?

a) P-Trap

b) Q-Trap

c) gully trap

d) S-Trap

3 / 30

3. Clean out is provided in the underground......sewer in place of manhole.

a) main sewer

b) trunk sewer

c) outfall sewer

d) lateral sewer

4 / 30

4. The type of joint used in HDP pipe is

a) butt welding

b) solvent welding

c) thread joint

d) dresser coupling joint

5 / 30

5. A circular section for a sewer is preferred only up to a diameter of:

a) 10 cm

b) 20 cm

c) 30 cm

d) 60 cm

6 / 30

6. To compensate for losses, thefts, and wastage of water, an allowance made of (as per NWSC)

a) 5%

b) 10%

c) 15%

d) 35%

7 / 30

7. 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

8 / 30

8. Self-purification of natural streams is caused due to

a) dilution

b) oxygen reduction

c) sunlight

d) all of the above

9 / 30

9. A sewer, which receives the discharge of a number of house sewers, is called:

a) house sewer

b) lateral sewer

c) intercepting sewer

d) sub-main sewer

10 / 30

10. The peak water consumption hours as recommended by the Department of Water Supply and Sewerage (DWSS) is.... hours.

a) 5.00-7.00

b) 7.00-12.00

c) 12.00-17.00

d) 17.00-19.00

11 / 30

11. Surface water is obtained from

a) well

b) spring

c) artesian well

d) rain

12 / 30

12. The working chamber of a manhole, along the direction of flow should have a minimum length for depth more than 0.8m:

a) 0.6 m

b) 0.9 m

c) 1.2 m

d) 2.4 m

13 / 30

13. Dengue is termed as which type of disease?

a) Waterborne

b) Water washed

c) Water based

d) Water related

14 / 30

14. The odour of water can be determined by...

a) microscope

b) telescope

c) sonoscope

d) osmoscope

15 / 30

15. Manholes on sewer lines are provided for:

a) periodic cleaning

b) providing air for oxidation

c) removal of part of sewerage

d) all of the above

16 / 30

16. In the above problem 151, using Manning's formula with n = 0.014 then the hydraulic gradient will be

a) 1:200

b) 1:400

c) 1:800

d) 1:1000

17 / 30

17. The sewer meant to carry excess discharge from an existing sewer is called:

a) main sewer

b) trunk sewer

c) outfall sewer

d) relief sewer

18 / 30

18. Physical characteristics of sewage include:

a) Turbidity

b) Color

c) Odor

d) All of the above

19 / 30

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

a) 15

b) 10

c) 5

d) 20

20 / 30

20. A water supply system is said to be continuous when it is supplied for:

a) 6 hrs

b) 12 hrs

c) 18 hrs

d) 24 hrs

21 / 30

21. Manhole is said to be medium if its depth is between:

a) 0.7-0.9 m

b) 0.9-1.2 m

c) 0.9-1.3 m

d) 0.9-1.5 m

22 / 30

22. After incubating a 2.5% solution of a sewage sample for 5 days at 20°C, the depletion of oxygen was found to be 5 PPM. The BOD of the sewage will be recorded as:

a) 5 PPM

b) 50 PPM

c) 100 PPM

d) 200 PPM

23 / 30

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

a) well

b) tube well

c) reservoir

d) none of the above

24 / 30

24. The amount of BOD in domestic water should be

a) 1 ppm

b) 2 ppm

c) 3 ppm

d) nil

25 / 30

25. 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

26 / 30

26. Which device warns that the liquid is above the pump level?

a) High-level alarm

b) Check valve

c) Union

d) Pump lift chain

27 / 30

27. The maximum amount of copper in domestic water should be

a) up to 3 ppm

b) up to 15 ppm

c) up to 45 ppm

d) all of the above

28 / 30

28. Purest water may have

a) no colour

b) faint blue-green colour

c) dark blue colour

d) brownish-yellow colour

29 / 30

29. Flush air inlets are sometimes called:

a) ventilated lamp holes

b) well hole

c) clean outs

d) flushing tank

30 / 30

30. 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

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