which of the following method is used when there is a difference in size and colour of desirable and Undesirable contituents.
(a) Handpicking (b) Threshing (c) Filtration (d) Decantation
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Answer:
(c) Filtration
Explanation:
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ANSWER: (a) Handpicking
HAND-PICKING:
The method of hand picking is used to separate undesirable substances such as small pieces of stones from wheat, rice, and pulses. The food grains containing small pieces of stones are taken in a flat container. The pieces of stones are picked up from the grains by hands, one by one, and thrown away.
Examples of hand picking:
The Hand picking method is used only when unwanted material is in small quantities. Moreover, the shape, size, or colour of the unwanted material is different from that of the useful materials.
For example; sands, broken grains, and insects are separated from rice, wheat, and pulses
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