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. Water security plan is prepared:

a) For consumptive use

b) For long-term minimization of hazards and risks

c) For quality water storage and uses for different purposes

d) For community participation

2 / 30

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

a) 15

b) 10

c) 5

d) 20

3 / 30

3. The amount of BOD in domestic water should be

a) 1 ppm

b) 2 ppm

c) 3 ppm

d) nil

4 / 30

4. Merit of water carriage sewage system:

a) no human agency is involved in this system

b) no problem of foul smell or hygienic trouble

c) less area is required

d) all of the above

5 / 30

5. Methemoglobinemia (Blue babies) is due to

a) oxidation of hemoglobin

b) nitrates replacing oxygen in hemoglobin

c) nitrites replacing oxygen in hemoglobin

d) carbon monoxide replacing oxygen in hemoglobin

6 / 30

6. Harmful bacteria are called:

a) Parasites

b) Anaerobic bacteria

c) Aerobic bacteria

d) Pathogens

7 / 30

7. Salvaging is:

a) extraction of essence from waste

b) dumping of solid waste

c) sanitary land filling of solid waste

d) none of the above

8 / 30

8. Growth of the population can be conveniently represented by

a) arithmetical curve

b) geographical curve

c) logistic curve

d) straight line curve

9 / 30

9. 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

10 / 30

10. Watershed control method is used to control

a) water in the pipeline

b) sedimentation in the reservoir

c) algae in the reservoir

d) bacteria in water

11 / 30

11. The relation between porosity, specific yield, and specific retention is given by

a) porosity = specific yield + specific retention

b) porosity = specific yield - specific retention

c) specific yield = porosity + specific retention

d) none of the above

12 / 30

12. Iron in water causes

a) stains on clothes

b) eutrophication

c) rust

d) corrosion

13 / 30

13. 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

14 / 30

14. Pressure relief valve is provided to prevent

a) the increase of pressure after a certain limit

b) back flow when the pump is stopped

c) the water flowing out of the suction pipe

d) none of the above

15 / 30

15. 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

16 / 30

16. Pump efficiency is 85%, motor efficiency is 94% then the combined efficiency of the two is

a) 90%

b) 80%

c) 70%

d) 85%

17 / 30

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

a) more depth

b) less depth

c) more discharge

d) less discharge

18 / 30

18. A source of colour in water is due to

a) silt

b) clay

c) organic debris

d) inorganic inert matter

19 / 30

19. 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

20 / 30

20. Minimum depth of infiltration gallery is

a) 2 m

b) 3 m

c) 4 m

d) 5 m

21 / 30

21. The water which is not chemically pure but does not contain anything harmful to human health is known as

a) pure water

b) wholesome water

c) polluted water

d) none of the water

22 / 30

22. The minimum height of a flushing cistern is:

a) 1 m

b) 2 m

c) 3 m

d) 5 m

23 / 30

23. The per capita consumption of a locality is affected by

a) climatic condition

b) quality of water

c) distribution pressure

d) all of the above

24 / 30

24. According to the guidelines of DWSS, the maximum number of users in each stand post should be:

a) 50

b) 100

c) 150

d) 200

25 / 30

25. Sewage is treated by aerobic bacteria action in:

a) septic tank

b) settling tank

c) trickling filter

d) oxidation pond

26 / 30

26. A manhole is generally provided at each:

a) bend

b) junction

c) change of gradient

d) change of sewer diameter

27 / 30

27. If 10 ml of raw sewage is diluted to 250 ml, the dilution factor is:

a) 24

b) 25

c) 1/25

d) none of the above

28 / 30

28. 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

29 / 30

29. The best sewer material to resist hydrogen sulfide corrosion is:

a) RCC

b) brick masonry

c) glazed stoneware

d) asbestos cement

30 / 30

30. The factor to be considered for the source of water supply is:

a) quantity and quality of available water

b) elevation of the sources of water

c) general terrain intervening the area

d) all of the above

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