81. The most dangerous pollutant in vehicular emissions is
82. The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is
83. The design period in years for pumping plants, is
84. At the junction of sewers
85. The most effective arrangement for diverting excess storm water into a natural drainage, is
86. Imhoff cone is used to determine
87. The algae dies out in the zone of
88. For detecting the nitrates in sewage, the colour may be developed by adding
89. For detecting the nitrites in the sewage, the matching colour may be developed by adding
90. The average temperature of sewage in India, is
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