Wool, jute, asbestos are classified as ____________.

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RRB JE CE 22 Apr 2025 Shift 1 CBT 2 Official Paper
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  1. mineral fibres
  2. animal fibres 
  3. man-made fibres
  4. natural fibres

Answer (Detailed Solution Below)

Option 4 : natural fibres
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Explanation:

Natural fibres are fibres that are obtained from natural sources—plants, animals, or minerals. The fibres in the question fall into this category:

  • Wool – Obtained from the fleece of animals (commonly sheep). It is an animal-based natural fibre.

  • Jute – Extracted from the stem of the jute plant. It is a plant-based natural fibre.

  • Asbestos – A naturally occurring silicate mineral that can be separated into thin, fibrous crystals. It is classified as a mineral-based natural fibre.

Additional InformationMineral fibres

  • These are fibres that are derived from naturally occurring minerals.

  • Example: Asbestos

  • Why incorrect: Only asbestos qualifies; wool and jute are not mineral fibres.

Animal fibres

  • These are fibres derived from animals, typically from their hair or secretions.

  • Examples: Wool (from sheep), silk (from silkworms)

  • Why incorrect: While wool fits, jute (plant) and asbestos (mineral) do not.

Man-made fibres

  • These are synthetic or semi-synthetic fibres produced through chemical processes.

  • Examples: Nylon, polyester, acrylic, rayon

  • Why incorrect: Wool, jute, and asbestos are all naturally occurring, not man-made.

Natural fibres

  • Fibres obtained directly from nature—plant, animal, or mineral origin.

  • Examples:

    • Animal: Wool, silk

    • Plant: Cotton, jute, flax

    • Mineral: Asbestos

  • Why correct: All three—wool, jute, and asbestos—fall under natural fibres from different sources.

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