Answer:

1. separate undesirable substances such as small pieces of stones from wheat, rice and pulses.

2. technique for separating particles of different sizes.

3. Is a technique used in separating the solid components of a heterogeneous mixture.

question:

handpicking is used to?

answer:

The method of hand picking is used to separate those mixtures where one of the component is in small quantity. The method of hand picking is used to separate undesirable substances such as small pieces of stones from wheat, rice and pulses.

question:

Sieving is used to?

answer:

Sieving. Sieving is a simple technique for separating particles of different sizes. A sieve such as used for sifting flour has very small holes. Coarse particles are separated or broken up by grinding against one another and the screen openings.

question:

physical manipulation is used to?

answer:

Physical Manipulation – Is a technique used in separating the solid components of a heterogeneous mixture. – The components of the mixture should be big enough to be seen and picked up by hands or forceps.

Explanation:

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