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Q.

Process of separating chaff from grain is done by :

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a

Winnowing

b

Threshing

c

Floating

d

Sinking

answer is A.

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Detailed Solution

Winnowing: Blow a current of air through (grains) in order to remove the chaff.  It is based on density.  Grains are heavier where as chaffs are lighter, hence it can be separated.
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