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. Advantage of pressure conduits is

a) flow is independent of the grade of the hydraulic grade line

b) economical since it follows a shorter path

c) less chance of water pollution as it is closed

d) all of the above

2 / 30

2. 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

3 / 30

3. 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

4 / 30

4. Which traps have curved legs?

a) P-Trap

b) Q-Trap

c) gully trap

d) S-Trap

5 / 30

5. 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

6 / 30

6. Alum increases

a) hardness of water

b) carbonate of water

c) sulphate of water

d) acidity of water

7 / 30

7. Pressure relief valve is provided in the water main

a) to reduce the pressure

b) upstream of the sluice

c) at the low point

d) all of the above

8 / 30

8. 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

9 / 30

9. Grit chamber has a detention period of:

a) 45 sec to 90 sec

b) 2 min to 5 min

c) 20 min to 30 min

d) 2 hours to 4 hours

10 / 30

10. 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

11 / 30

11. 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

12 / 30

12. Physical characteristics of sewage include:

a) Turbidity

b) Color

c) Odor

d) All of the above

13 / 30

13. The valve which allows water to flow in one direction but prevents its flow in the reverse direction is

a) reflux valve

b) gate valve

c) sluice valve

d) pressure valve

14 / 30

14. Pipes for water supply are tested for

a) pressure

b) leakage

c) dimensions

d) all of the above

15 / 30

15. 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

16 / 30

16. Booster pump is used for

a) water supply

b) sewage pumping

c) pressure increase

d) drinking purposes

17 / 30

17. The interference of the well depends upon

a) the number of wells

b) spacing between wells

c) types of wells

d) all of the above

18 / 30

18. The presence of hydrogen sulfide in water causes:

a) softening

b) acidity

c) alkalinity

d) bad taste

19 / 30

19. Corrosion of well pipes can be reduced by:

a) using thicker pipes

b) reducing the flow velocity

c) reducing the draw dawn

d) all of the above

20 / 30

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

a) Darcy's

b) Slitcher's

c) Hazen's

d) Lacy's

21 / 30

21. Water for domestic consumption should be:

a) colorless, odorless & tasteless

b) free from dissolved salts

c) hygienically safe

d) attractive for looks

22 / 30

22. Depth of shallow tube well shall not be more than (considering economic point):

a) 30 m

b) 40 m

c) 50 m

d) 60 m

23 / 30

23. "Dental Caries" will be absent where the following is present

a) mottled enamel of teeth

b) itai-itai

c) methemoglobinemia

d) cancer

24 / 30

24. As compared to shallow tube wells, deep wells have

a) more depth

b) less depth

c) more discharge

d) less discharge

25 / 30

25. Dug wells or open wells

a) have a diameter between 1 to 4m

b) are suitable for a small discharge of about 20cum/hour

c) are cheap in construction

d) all of the above

26 / 30

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

a) 15

b) 10

c) 5

d) 20

27 / 30

27. Which one is a waterborne disease?

a) malaria

b) cancer

c) dysentery

d) encephalitis

28 / 30

28. Thrash rack/roughing filter is provided at the entrance of

a) intake

b) slow sand filter

c) rapid sand filter

d) all of the above

29 / 30

29. Grit obtained in a grit chamber is used for:

a) as a manure

b) as a soil conditioner

c) as a coarse aggregate

d) as a substitute for sand

30 / 30

30. 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

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