Water Supply & Sanitation Engineering Online Test – Paper 3

1. Excess concentration of sodium salts in water causes

2. The main pipes must be designed to carry

3. Choose the odd statement:

4. Corrosion of well pipes can be reduced by:

5. Per capita water demand is calculated in liters

6. If p is the population of a place in thousands then the fire demand of water in liters per minute, according to Kuichling formula, is given by

7. Water horsepower of a pump is given by

8. A structure constructed where self-cleaning velocity is not developed to prevent choking is called:

9. Iron and manganese are estimated by

10. 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:

11. A lamp hole is helpful in:

12. Pressure relief valve is provided to prevent

13. If the period of incubation at 37°C is 15 days in the relative stability test on sewage, the relative stability is:

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

15. For an insignificant effect on the water table, the tube wells are spaced as one in every

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

17. Digesters are used for:

18. The types of diseases caused due to the lack of water are known as

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

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

21. Alum increases

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

23. To compensate for losses, thefts, and wastage of water, an allowance made of (as per NWSC)

24. The water supply demand in a day school without a boarder should be

25. The specific retention is least in the soil type

26. The characteristics of fresh and septic sewage are:

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

28. Odour is measured in terms of...

29. Turbidity of water sample depends on

30. The working conditions in imhoff tanks are:

31. For areas of distributed rainfall throughout the year with less intensity, the suitable system of sanitation is:

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

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

34. A structure constructed to remove obstacles in the sewer is known as:

35. The presence of hydrogen sulfide in water causes:

36. Which device warns that the liquid is above the pump level?

37. Air inlet valve is provided in water mains at

38. The water collected for the sample from the

39. Dyspepsia (Indigestion) is caused due to

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

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

42. The maximum diameter of a sewer pipe should preferably be:

43. A water supply system is said to be continuous when it is supplied for:

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

45. 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:

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

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

48. Aeration of water is done by

49. Water to the consumers may be supplied from

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