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civil engineering upsc civil service exam questions
1. A river is the source of water for water supply to a town. Its water is very turbid and polluted. The correct sequence of steps for treating the river water would be :
(A): coagulation -> filtration -> sedimentation -> post-chlorination
(B): coagulation -> sedimentation -> post-chlorination
(C): Presedimentation -> prechlorination -> coagulation -> sedimentation -> filtration -> post chlorination
(D): sedimentation -> post-chlorination
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