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Q.

The method used to separate the components of different densities  using wind is


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a

Threshing

b

Winnowing

c

Sieving

d

None of these 

answer is B.

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Detailed Solution

 The method used to separate the components of different densities  using wind is winnowing.
To separate the components of different densities, a process is used which is known as winnowing. In this process, heavier and lighter components of a mixture are separated by the help of wind or blowing air. Husk is removed from grain seeds using this process. In this process, grains are allowed to fall from a certain height. Since, husk is lighter than the grains, it is removed easily by air blow.
 
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