Question

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Answer 1

Question 38: Winnowing

Question 39: Sieving

Question 40: Hand picking

Question 41: (b) and (c)

38: Winnowing is a common agricultural practice separating husk from grains.

39: The separation of particles of different sizes using a sieve is called sieving.

40: The visible unwanted particles are removed by hand, the process is called hand picking.

41: The statements which are valid are :

(b) Mixtures have variable composition.

(c) When two (or) more elements unite chemically, a compound is formed.