Why the switches and plugs are made of plastics?


Plastics are poor conductor of electricity and resistant to heat, so they do not allow the electric current to pass through them making them safe to handle. So they are used to make electric switches and plugs.

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What are thermosetting plastics?


Thermosetting plastics are those plastics, which can be only moulded for once. They cannot be reshaped or reused because they do not get softened on heating. Bakelite, melamine etc. are examples of thermosetting plastics.

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Why the handles of the utensils are made of bakelite?


Bakelite is a thermosetting plastic. It is a bad conductor of heat. It does not allow heat to pass through it easily. So, it is used to make the handles of the utensils so that it does not get heated and it becomes easy to handle the cookware while cooking.

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What are thermoplastics? Explain with examples.


Those plastics which can melt on heating and which can be reshaped on moulding again and again are called thermoplastics. P.V.C., Polythene are examples of thermoplastics. Toys, containers, car grills, combs etc. are made with thermoplastics.

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Out of the following materials :

Cotton, Nylon, Terylene, Wood, PET, Acrylic

Which materials are polyesters?


Terylene, PET are polyesters.

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