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Question

Raj's house was under construction.During the construction, he saw a man removing pebbles and stones using a plastic mesh held in a frame.Which method of separation is used here? Explain it in detail. [3 MARKS]


Solution

Solution : [1 Mark]
Explanation : [2 Marks]
The method of construction is sieving in this case.

Sieving is used to separate substances that are of different sizes. In this method, a sieve is used. The smaller components of the mixture can pass through the pores of the sieve whereas bigger components of the mixture are retained by the sieve.
For example, wheat flour has some finely powdered wheat as well as some bigger impurities. When this flour is put through a sieve, the fine powder falls through the small holes in the sieve, while the thicker impurities remain as they are too big for these holes. And hence, the substances are separated from the mixture. 

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