Separation Techniques: Handpicking and Sieving

What is the purpose of handpicking in separating substances from mixtures?

What is the main principle of sieving in separating substances from mixtures?

What is the process of separating grains from their stalks called?

What is the main purpose of winnowing in agriculture?

What is the main characteristic of the substances that can be separated by handpicking?

What is the main tool used in sieving?

What is the method of separating substances from mixtures using a magnet?

What is the main purpose of threshing in agriculture?

What is the primary purpose of handpicking?

What is the main characteristic of a sieve?

In which situation is sieving used?

What is the term for the process of separating grains from their stalks?

How can threshing be done?

What is the main principle of winnowing?

What is the purpose of winnowing in agriculture?

What is the characteristic of husk in relation to grain?

Separation of Mixtures

Handpicking is a method used to separate undesirable solid substances or impurities from useful solids by hand.
Handpicking is used when the undesirable substances differ in shape, size, or color, and are present in small quantities.
Examples of handpicking include removing stones, insects, and broken grains from rice and pulses before cooking.

Sieving

Sieving is a method used to separate components of a mixture using a sieve.
A sieve is a piece of mesh held in a frame, which allows fine particles to pass through while retaining bigger components.
Sieves of different sizes are available for different purposes, such as sieving flour at home and separating stones and pebbles from sand at a construction site.

Threshing

Threshing is the process of separating grains from stalks, used in agriculture after harvesting.
Crops are cut from the field, sorted into bundles, and then threshed to separate the grains from the stalks.
Threshing can be done by beating the stalks against a hard surface, using animals like bullocks to trample the stalks, or using machines.

Winnowing

Winnowing is a method that uses wind to separate heavier components of a mixture from lighter ones.
Farmers use winnowing to separate grains from their dry outer covering called husk, which is carried away by wind while the heavier grains fall near the place of winnowing.

Magnetic Separation

Magnetic separation is a method that uses a magnet to separate a magnet substance from a non-magnetic substance in a mixture.

Learn about the separation techniques of handpicking and sieving, used to separate desirable solids from impurities based on shape, size, color, and quantity.