Question

3. Which type of components of a mixture can be separated by sieving?
4. How will you remove impurities from pulses or rice grains before cooking?
5. How is winnowing useful to farmers?
6. How is common salt obtained from sea water?
7. Is it possible to separate a mixture of sugar and wheat flour? If so, how will you do it?​

Answer 1

Answer:

The process of separating solid constituents of different particle sizes; through a sieve is called sieving. Sieving is used while separating bran from flour. It is also used while separating pebbles from sand. How will you separate sand and water from their mixture?

Answer 2

Answer:

3-The process of separating solid constituents of different particle sizes; through a sieve is called sieving. Sieving is used while separating bran from flour. It is also used while separating pebbles from sand.

4-To separate husk or dirt particles from a given sample of pulses before cooking, we need to wash the pulses with water. Husk or dirt particles being lighter keep floating in water and pulses grain will settle down so we can easily remove them. Then, water with impurities can be removed by decantation.

5-Winnowing: The process of separating heavier and lighter components of a mixture by wind or by blowing air is called winnowing. This method is used by farmers to separate lighter husk particles from heavier seeds of grain