Water Supply & Sanitation Engineering Online Test – Paper 3

1. If 10 ml of raw sewage is diluted to 250 ml, and the dissolved oxygen content of the diluted sample changes from 9 mg/l to 5 mg/l after incubation at 20°C. for 5 days, BODs of raw sewage is:

2. The pipe used to carry discharge from sanitary fittings like bathrooms, kitchens, etc., is:

3. Highly colored waters are

4. Which test is a must for a house sewer?

5. Most suitable section, when the maximum and minimum flow ratio is not much, is:

6. The types of sanitation in which urine and soil are separated are:

7. Disinfection of water involves.....

8. The water collected for the sample from the

9. The underground structure in the form of a circular or rectangular tank for the purpose of admitting sewerage into it from the intercepting chamber is called:

10. The per capita consumption of a locality will be more when

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

12. The valve provided at low points of the pipe to drain off water quickly under gravity is

13. Watershed control method is used to control

14. Groundwater from artesian wells

15. Treatment of sewage of small estates and colonies is done by:

16. In strainer type wells

17. The inlet and outlet pipes of the septic tank are bent:

18. An egg-shaped section of sewer:

19. Dyspepsia (Indigestion) is caused due to

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

21. By boiling water, hardness can be removed if it is due to:

22. The colour of water is measured on the platinum cobalt scale with the help of

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

24. A complete water supply system includes:

25. The water supply demand in a fully plumbed system in Nepal context

26. The sewerage system originates from:

27. PVC pipes can withstand pressure up to

28. Asbestos pipes are

29. For separate and partially separate systems, the pattern of collection suitable is:

30. Abyssinian tube well is a special type of

31. Copper pipes are

32. Most commonly used section in the grade aqueduct is

33. Drop manholes are provided on sewers in:

34. When more than two sewers join in a manhole:

35. The velocity of flow does not depend on:

36. The specific gravity of sewage is:

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

38. True colour of water is due to

39. Sterilized water is generally used for

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

41. Grit is:

42. Manhole is said to be shallow if its depth is less than:

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

44. An advantage of the intermittent system of the water supply system:

45. Following material is used during drilling to prevent caving

46. Water security plan is prepared:

47. The radius of influence of the well varies with

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

49. Water for domestic consumption should be:

50. In Chezy's formula v=c√ms for calculating the velocity of flow in a circular sewer, the Chezy's constant c depends upon: