Water Supply & Sanitation Engineering Online Test – Paper 3

1. Asbestos pipes are

2. Mass action' during sedimentation is the property of:

3. Water demand for public use as compared to the total demand, kept in the design of waterworks for a city, is

4. The working conditions in imhoff tanks are:

5. Which metal is good for keeping drinking water?

6. Gastrointestinal irritation is produced because of excess of the following in water

7. Any trap is intended to trap foul gases with the provision of:

8. A goose neck is:

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

10. 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:

11. The object of cowl is to:

12. The types of pump suitable for water as well as sewage

13. The clarigesters are:

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

15. PVC pipes can withstand pressure up to

16. The bacteria which require free oxygen for their survival are called:

17. The most suitable excreta disposal unit for human excreta is:

18. The diameter of pipes in bathrooms and lavatories in domestic water supply is:

19. A source of colour in water is due to

20. The type of joint used in joining the plain ends of cast-iron pipes is

21. If in the relative stability test on sewage, the period of incubation at 20°C is 15 days, the relative stability is:

22. The service pipes must be designed to carry

23. Water for domestic consumption should be:

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

25. The suitable system of sanitation for an area having rainfall for only one season is:

26. The location of a well is considered good if it is sunk into

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

28. The minimum height of a flushing cistern is:

29. The gradient to be provided for sewers depends upon:

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

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

32. Kidney damage may be caused due to excess concentration of

33. At the socket and spigot joint,

34. Letache is observed in:

35. From the septic tank, the effluents are discharged into:

36. If Q is discharge in cubic meters per second and D is the economical diameter of the pipe, then according to Lea

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

38. Turbidity is undesirable because it

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

40. The depression of the water table in a well due to pumping will be maximum

41. The hourly variation factor is generally taken

42. Manholes on sewer lines are provided for:

43. When the fall in elevation is greater than 60cm, the manhole provided is called:

44. The detention time in a septic tank is usually:

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

46. The sewage consists of water:

47. The pipe joint commonly used in a pumping station is

48. A sewer that collects sewage from toilets is called:

49. Methemoglobinemia (Blue babies) is due to

50. Which of the following impurities in water is removed by the sedimentation process?