Which of the following methods is used to separate stones from grains?

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Threshing

Winnowing

Hand picking

Sieving

answer is C.

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Detailed Solution

Hand picking is used to separate stones from grains.
Hand-picking is the method used to separate mixtures in which one substance is in large quantity while another is in small. For example, stones can be easily picked up by hand from grains. Hand-picking is used to separate useful substances from undesired ones by hand. This method is useful in separating larger-sized impurities or substances which are easily visible to the naked eye. It can be used to separate those mixtures which differ in colour, shape, or weight.

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