Question

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challenge hy friends

1 synthetic fibre or natural fibre explain in points
2 types of synthetic fibre explain in points (rayon, nylon, Dacron, acrylic)
3 plastic explain in points
4 thermosetting explain in points
5 thermoplastic explain in points

Bhai or bhano expert hi answer do please

Answer 1

1 synthetic fibre are obtained from chemicals whereas natural fibre are obtained from nature. 2 a rayon it is also called artificial silk. It is obtained from pure cotton which is treated with chemical to form rayon. 3plastic are synthetic polymers. 4 thermoplastic these are the polymers which can be change into various shapes again and again. 5 thermosetting are the polymers which can only be shaped once

Answer 2

1. Synthetic fibres: fibres which are man made and are made from petrochemicals are called synthetic fibres. For example: nylon,polymer,rayon etc. 2. (i. fibre obtained by chemical treatment of wood pulp is called rayon. (ii. fibre which is man made and is made without using any natural raw material (from plant or animal) is called nylon . (iii. Dacron (polyethylene terephalate ) is a very familiar form of polyester . It is used for making bottles , utensils, films , wires etc. (iv. Fibre which is actually not made from natural wool , though it appear to resemble wool is called acrylic. 3.(i. plastic is also a polymer like the synthetic fibre . (ii. All plastic do not have the same arrangement units. (iii. plastic is also available in possible shapes and sizes. 4. (i. plastic which gets deformed easily on heating and can be bent easily are known as thermoplastic. For ex: polythene and PVC . 5. plastics which when moulded once , cannot be softened by heating are known as thermosetting plastics. For ex: bakelite and melamine.