81. $${\frac{3}{4}^{{\text{th}}}}$$ or $${\frac{1}{4}^{{\text{th}}}}$$ extra space is left in sewer pipes at maximum discharge for
82. In detritus tanks,
83. Kjeldahl nitrogen is a mixture of
84. The intensity of rain is expressed in
85. For sewers, inverted siphon is provided for
86. For large sewers, maximum distance between manholes may be
87. In sewage, the solids in mg per litre is
88. For the COD test of sewage, organic matter is oxidised by K2Cr2O7 in the presence of
89. To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of
90. Pathogens (or pathogenic bacterias) in water may cause
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