Q.

The process/es used to separate pebbles and stones from sand is/ are


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a

Handpicking

b

Sieving

c

Winnowing

d

None of these 

answer is B.

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Detailed Solution

The process used to separate pebbles and stones from sand is sieving.
The process in which bigger particles are separated from fine particles by using a sieve is known as sieving. Once the mixture is passed through the sieve, the bigger particles are retained in the sieve, and the finer particles pass through the holes of the sieve and are collected eventually. For example, when a mixture of sand, pebbles, and stones is passed through the sieve, the pebbles and stones remain on the sieve, and the sand passes through the sieve and gets collected.
 
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