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. A communicable disease is

a) cancer

b) fluorosis

c) tuberculosis

d) goitre

2 / 30

2. The water collected for the sample from the

a) 10-20 cm below from the surface

b) 20-30 cm below from the surface

c) 30-40 cm below from the surface

d) 40-50 cm below from the surface

3 / 30

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

a) centrifugal

b) hydraulic ram

c) reciprocating

d) rotary

4 / 30

4. Disinfection of water involves.....

a) killing of diseases bacteria

b) produce of diseases of water

c) no change diseases bacteria

d) none of the above

5 / 30

5. Aeration of water is done to

a) remove carbon dioxide and taste in water

b) remove taste and odour in water

c) increase the quantity of oxygen in water

d) all of the above

6 / 30

6. Most common sources of water in hill and terai in our country are...respectively.

a) surface and ground

b) ground and surface

c) surface and surface

d) ground and ground

7 / 30

7. 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

8 / 30

8. 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

9 / 30

9. The difference between a septic tank and an imhoff tank is that in an imhoff tank:

a) digestion takes place in a different compartment

b) it is suitable for serving a much bigger population

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

d) none of the above

10 / 30

10. 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

11 / 30

11. In the one-pipe system of plumbing, the number of vertical pipes is:

a) 1

b) 2

c) 3

d) 4

12 / 30

12. 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

13 / 30

13. The type of joint used in plastic pipe is

a) butt welding

b) solvent welding

c) thread joint

d) dresser coupling joint

14 / 30

14. Impetus valve/waste valve is provided in

a) hydraulic ram

b) centrifugal pump

c) rotary pump

d) all of the above

15 / 30

15. Septic tanks are best suited for:

a) municipalities

b) industries

c) scattered residences

d) congested areas

16 / 30

16. Purest water may have

a) no colour

b) faint blue-green colour

c) dark blue colour

d) brownish-yellow colour

17 / 30

17. To determine the velocity of flow of underground water, the most commonly used non-empirical formula is

a) Darcy's formula

b) Slitcher's formula

c) Hazen's formula

d) Lacy's formula

18 / 30

18. If D is the diameter of the upper circular portion, the overall depth of a standard egg-shaped section, is:

a) D

b) 1.2D

c) 1.5D

d) 2D

19 / 30

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

a) microscope

b) telescope

c) sonoscope

d) osmoscope

20 / 30

20. 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

21 / 30

21. 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

22 / 30

22. The color of septic sewage is:

a) grey

b) black

c) white

d) blue

23 / 30

23. The specific retention is least in the soil type

a) coarse gravel

b) sand

c) clay

d) silt

24 / 30

24. In a circular sewer if depth of flow is 0.2 times the full depth, the nominal gradient:

a) is only provided

b) is doubled

c) three

d) none of the above

25 / 30

25. An egg-shaped section of sewer:

a) is economical than a circular section

b) is more stable than a circular section

c) provides self-cleansing velocity at low discharge

d) all of the above

26 / 30

26. The sewage in an inverted siphon will flow under what condition?

a) Air

b) Vacuum

c) Pressure

d) Gravity

27 / 30

27. Laying of a sewer is generally done with the help of:

a) sight rails and boning rod

b) theodolite and staff

c) leveling and staff

d) all of the above

28 / 30

28. If the diameter of a sewer is 150 mm, the gradient required for generating a self-cleaning velocity is:

a) 1 in 10

b) 1 in 100

c) 1 in 200

d) 1 in 300

29 / 30

29. The amount of BOD in domestic water should be

a) 1 ppm

b) 2 ppm

c) 3 ppm

d) nil

30 / 30

30. Water to the consumers may be supplied from

a) rainy wells sunk to the water level

b) infiltration well dug out on the banks of rivers

c) infiltration galleries connected to a sump well

d) all of the above

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