51. As compared to geometrical increase method of forecasting population, arithmetical increase method gives
52. The rate of BOD exerted at any time is
53. If the coli form bacteria is present in a sample of water, then the coli-form test to be conducted is
(i) Presumptive coli-form test
(ii) Confirmed coli-form test
(iii) Completed coli-form test
(i) Presumptive coli-form test
(ii) Confirmed coli-form test
(iii) Completed coli-form test
54. Percentage of bacterial load that can be removed from water by the process of plain sedimentation is about
55. The type of sewer which is suitable for both combined and separate system is
56. Which of the following is not a water borne disease?
57. The type of valve which allows water to flow in one direction but prevents its flow in the reverse direction is
58. The rate of Alteration of pressure filters is
59. A pipe which is installed in the house drainage to preserve the water seal of traps is called
60. Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)
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