Separation Techniques: Handpicking and Sieving
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Questions and Answers

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

  • To separate fine particles from bigger components
  • To separate undesirable substances from useful ones based on shape, size, or color (correct)
  • To separate heavier components from lighter ones
  • To separate magnetic substances from non-magnetic ones

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

  • Beating stalks against a hard surface to separate grains
  • Using a magnet to separate substances
  • Using wind to separate heavier components from lighter ones
  • Passing fine particles through a mesh while retaining bigger components (correct)

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

  • Winnowing
  • Handpicking
  • Sieving
  • Threshing (correct)

    • What is the main purpose of winnowing in agriculture?

    <p>To separate husk from grains (A)</p> Signup and view all the answers

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

    <p>They have different shapes, sizes, or colors (A)</p> Signup and view all the answers

    What is the main tool used in sieving?

    <p>A sieve (D)</p> Signup and view all the answers

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

    <p>Magnetic separation (A)</p> Signup and view all the answers

    What is the main purpose of threshing in agriculture?

    <p>To separate grains from their stalks (C)</p> Signup and view all the answers

    What is the primary purpose of handpicking?

    <p>To separate undesirable substances from useful solids (C)</p> Signup and view all the answers

    What is the main characteristic of a sieve?

    <p>It is a piece of mesh held in a frame (B)</p> Signup and view all the answers

    In which situation is sieving used?

    <p>At home to sieve flour and at a construction site to separate stones and pebbles from sand (D)</p> Signup and view all the answers

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

    <p>Threshing (B)</p> Signup and view all the answers

    How can threshing be done?

    <p>By all of the above methods (D)</p> Signup and view all the answers

    What is the main principle of winnowing?

    <p>Separating heavier components from lighter ones (C)</p> Signup and view all the answers

    What is the purpose of winnowing in agriculture?

    <p>To separate the grains from their dry outer covering called husk (D)</p> Signup and view all the answers

    What is the characteristic of husk in relation to grain?

    <p>It is lighter than grain (C)</p> Signup and view all the answers

    Study Notes

    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.

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    Description

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

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