Hamad Environmental Engineering 29/10/2020 A. 10 to 25 B. 50 C. 75 D. 100 Related Mcqs: In water treatment, rapid gravity filters are adopted to remove_______________?A. dissolved organic substances B. dissolved solids and dissolved gases C. floating solids and dissolved inorganic solids D. bacteria and colloidal solids... The self cleansing velocity for all sewers in India is usually_________________?A. less than 1.0 m/sec B. 1.0 m/sec to 1.2 m/sec C. 1.5 m/sec to 2.0 m/sec D. 3.0 m/sec to 3.5 m/sec... When there is no recirculation of sewage, then recirculation factor is_______________?A. 0 B. 1 C. infinity D. none of the above... The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by_______________?A. TOD>BOD>COD B. TOD>COD>BOD C. BOD>COD>TOD D. COD>BOD>TOD... The chemical most commonly used to increase speed of sedimentation of sewage is_______________?A. sulphuric acid B. copper sulphate C. lime D. sodium permanganate...
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