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civil engineering upsc civil service exam questions
1. The correct sequence of processes in a water treatment plant for rural water supply is
(A): Aeration, plain sedimentation, slow sand filter, chlorination
(B): Chlorination, aeration, sedimentation, rapid sand filter
(C): Coagulation, flocculation, clarification, pressure filter
(D): Coagulation, sedimentation, slow sand filter, chlorination
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