1) What is the formula for compound water a) H₂O b) H₂O₂ c) There is no formula far compound water 2) What is potable water a) Water which is not fit for drinking b) Sea water c) Lake water d) Water which is fit for drinking 3) Purest form of water a) Sea water b) River water c) Lake water d) Rain water 4) Impurest form of water a) Lake water b) Sea water c) Potable water d) Rain water 5) Two underground sources of water a) Well, Spring b) River water c) Lake water d) Mountain water 6) Chemicals used in Sedimentation and Decantation tank a) Chlorine b) Bleaching powder c) Alum & Lime d) Sand & Gravel

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