Answer :

Natural Fibres give the smell of burning hair upon burning while artificial Fibres upon heating give the smell of the burning paper.

Similarly, Natural Fibres catch fire very early and melt down very easily and artificial Fibres burn slowly.

Depending upon these test, materials can be classified as follows.

Natural Fibres: Hair, wool, silk, cotton thread, the thread of sweater (wool).

Artificial Fibres: paper, a piece of plastic, the thread of sweater (Synthetic) and a piece of rope.

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