Sewage Treatment Plant objective questions and answers

36. Direct destruction to pathogenic bacteria is caused by

   A.Direct exposure to sunight

   B.Oxidation

   C.Burning

   D.Chlorination

37. The maximum permissible colour for doomestic suppilies basedon cobalt scale is

   A.5ppm

   B.10ppm

   C.20ppm

   D.40ppm

38. Lead caukled joints are used for laying

   A.Stone ware pipes

   B.Earthen ware pipes

   C.C.I pipes

   D.G.I pipes

39.  Disposal to sewage in large cities, is done in

   A.Irrigation

   B.Dilution

   C.Oxidation

   D.Putrification

40. In case of potanble water the permissibleupper limit of chloride content is

   A.500 ppm

   B.400 ppm

   C.350 ppm

   D.250 ppm

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