1) How much of the earth covered with water? a) 3/4 b) 90% c) 2/3 d) 1/4 2) Name two visible impurities in water? a) Salt and germs b) Soil c) Mud and algae d) Minerals 3) Which is better water purifier? a) UV Purifier b) RO Purifier c) Boiler d) UV light 4) Name two invisible impurities in water? a) Mud b) Algae c) Salt and germs d) Soil and stone 5) Which chemical used to kill germ in large amount of water? a) Nitrogen b) Hydrogen c) Chlorine d) Hydrochloric acid 6) Which water is portable water? a) Muddy water b) Purified water c) Pond water d) Sea water 7) It is the process of heating and boiling water such that the vapour can be collected and the impurities are left behind? a) Filtration b) Sedimentation c) Distillation d) Chlorination

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