1.

Arrange the steps in a sequence for the removal of microorganisms during the purification of drinking water. (a) Lime feeder(b) Mechanical mixing(c ) Alum feeder(d) Sedimentation tank(e) Passing through gravel and sand (f) Chlorine feeder

Answer»

C a b d e f
c b a d e f
e a b c f d
a b d c e f

Solution :(i) Alum feeder(ii) Lime feeder
(iii) Mechanical MIXING(iv) Sedimentation TANK
(v) Passing through gravel and SAND(vi)Chlorine feeder


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