Wired Faculty
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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.
Explain why some fibres are called synthetic.
Rayon is different from synthetic fibre because
Synthetic fibres are also called _______ or _____ fibres.
Synthetic fibres are synthesised from raw material called ______.
Like synthetic fibres, plastic is also a ________.
Give examples which indicate that nylon fibres are very strong.
Explain why plastic containers are favoured for storing food.
Explain the difference between the thermoplastic and thermosetting plastics.
Explain why the following are made of thermosetting plastics.
(a) Saucepan handles
(b) Electric plugs/switches/plug boards
Categorise the materials of the following products into ‘can be recycled’
and ‘cannot be recycled’:
Telephone instruments, plastic toys, cooker handles, carry bags, ball point
pens, plastic bowls, plastic covering on electrical wires, plastic chairs,
electrical switches.
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Mock Test Series
