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Practice each question, then open the answer or worked solution.
Name and describe briefly a method that can be helpful in separating a mixture of husk from grains. What is the principle of this method?
Ans: Winnowing is the process of separating the husk from the grains. From a particular height, the mixture is allowed to fall. The lighter husk gets blown away by the wind and falls to the ground in this case. The grains fall to the earth in a direct line.
Match the mixtures in Column I with their method of separation in Column II.
Column I | Column II |
(a) Oil mixed in water | (i) Sieving |
(b) Iron powder mixed with flour | (ii) Handpicking |
(c) Salt mixed with water | (iii) Decantation |
(d) Lady’s finger mixed with French beans | (iv) Magnet |
(e) Rice flour mixed with kidney beans | (v) Evaporation |
Ans: The correct match is-
Column I | Column II |
(a) Oil mixed in water | (iii) Decantation |
(b) Iron powder mixed with flour | (iv) Magnet |
(c) Salt mixed with water | (v) Evaporation |
(d) Lady’s finger mixed with French beans | (ii) Handpicking |
(e) Rice flour mixed with kidney beans | (i) Sieving |