Question 1

Which method is used to separate grains from stalks?

Accepted Answer

Threshing is the process that is used to free grain seeds from the chaff. It is done by beating the crop against a hard surface or using machines.

Question 2

Winnowing is used to separate:

Accepted Answer

Winnowing is used to separate heavier and lighter components of a mixture by wind or blowing air, such as wheat grain from husk.

Question 3

Which method is used to separate stone pieces from wheat?

Accepted Answer

Handpicking is a convenient method for separating slightly larger sized impurities like the pieces of dirt, stone, and husk from wheat, rice or pulses.

Question 4

Sieving is used when components of a mixture have:

Accepted Answer

Sieving allows fine flour particles to pass through the holes of the sieve while the bigger impurities remain on the sieve, which happens when components are of different sizes.

Question 5

The process of settling of heavier components in a mixture of water and insoluble solid is called:

Accepted Answer

Sedimentation is the process where heavier insoluble components settle down at the bottom of the liquid when left undisturbed for some time.

Separation of Substances