Question

daily life uses of sieving method of seperation

Answer 1

in homes for seperating wheat flour from some other substance
separating tea leaves from tea

Answer 2

Separating solid from a mixture of solids

Handpicking: It is the simplest method of separation of substances. This method is used only when unwanted material is in small quantity. Moreover, shape, size, or colour of the unwanted material is different from that of the useful materials. For example; pebbles, broken grains and insects are separated from rice, wheat and pulses; by handpicking.

Threshing: Threshing is used for separating seeds from the harvested stalks.

Manual Threshing: When the quantity is small, threshing is done manually. Small bundles of the harvested stalks are thrashed on a hard surface. This helps in separating the grains.Threshing by Animals: For larger quantities, threshing is done in the traditional way; by using animals. For this, stalks are spread around a pole. Several bullocks are tied to the pole and are made to walk over the harvested stalks. Trampling by hooves of the animals helps in separating grains.Threshing Machine: Now-a-days, threshing machines are used for the purpose. It can be powered by either a diesel engine or an electric motor. It helps in saving time and labour.

Sieving: When the size of particle it too small to be picked by hand or when the quantity is too large, sieving is used for separating substances. A sieve; having holes of proper size is used. The bigger particles are retained by the sieve whereas the smaller ones pass through it. For example; this method is used for separating bran from flour, sand from gravel, pearls of different sizes, etc.

Winnowing:The process of separation of lighter particles from heavier particles; with the help of wind; is called winnowing. This method is used for separating grains from husk. Farmers drop the mixture of wheat and husk from a height. The husk is carried by the wind and form a heap at a small distance away. The wheat grains being heavier fall vertically to form a separate heap.

Combine Harvester: Modern farming involves use of a machine; called combine harvester. This machine harvests, threshes and winnows in a single operation. Combine harvesters are used in developed countries; like the USA. In India, such machines can be seen in the farms of Punjab.

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