26. By boiling water, hardness can be removed if it is due to
27. Unfinished Dream is a book written by?
28. The classical Indian music has its origin in which of the following? or Which of the following Vedas is rendered musically?
29. The least thickness of class B cast iron (spun) pipe, is
30. According to IS : 1172-1963, a minimum of 135 litres of water capita per day, is required for
31. The R.L. of ground water table on the sides of a valley is 1505 m whereas R.L. of the stream water is 1475 m. If 60° slope consists of pervious soil between R.L. 1485 m to 1500 m, the gravity spring may be expected at the point of reduced level
32. The factor affecting per capita demand, is
33. Pick up the incorrect statement from the following. The underground sources of water, is from
34. Disinfection of drinking water, is done to remove
35. Sunlight
36. The expected discharge to be obtained from an open well sunk in coarse sand is 0.0059 cumec. If the working depression head of the well is 3 m, the minimum diameter of the well, is
37. Average annual rainfall at any station is the average of annual rainfall over a period of
38. Time of concentration
39. If four fires break out in a city of population 40 lakhs and if each hydrant has three streams and duration of each fire is four hours, the total quantity of water required, is
40. The fire demand of a city may be worked out by
41. Aeration of water is done to remove
42. The yield of a rapid gravity filter as compared to that of slow sand filter, is
43. While determining the yield of open wells by the pumping test
44. Increase in population of a rapidly growing city, may be estimated by
45. Pick up the correct statement from the following regarding the pressure conduits :
46. The standard B.O.D. at 20&Deg;C, is taken for the consumption in
47. Which bird is called ‘Foolish bird’?
48. Percussion drilling is unsuitable in
49. Disinfection of water with ozone is not good because
50. An earth formation which, although porous and capable of absoring water does not provide an appreciable supply to wells, is known as