31. Design period of 40 to 50 years is adopted for
32. Setting out the alignments of sewers may start from
33. The rate of accumulation of sludge per person per year, is
34. The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is
35. To maintain aerobic biological activity, the moisture content of the compost mass should be about
36. A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of
37. Pick up the incorrect statement from the following for allowing workers to enter sewers
38. Imhoff cone is used to measure
39. The normal values of over flow rates for secondary sedimentation tanks, ranges between
40. The normal value of over flow rates for plain primary sedimentation tanks, ranges between
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