Filtration on Environmental Studies related Questions and Answers

Question :   Identify the correct statement from the following options. 1. Rapid sand filter has a high initial cost 2. Coagulation is essential in slow sand filter 3. Slow sand filter requires skilled supervision 4. Period of cleaning of Rapid sand filter is 1-2 days Answer :   4 - Period of cleaning of Rapid sand filter is 1-2 days