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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.
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.
Rana wants to buy shirts for summer. Should he buy cotton shirts or
shirts made from synthetic material? Advise Rana, giving your reason.
Give examples to show that plastics are noncorrosive in nature.
Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.
‘Avoid plastics as far as possible’. Comment on this advice.
Match the following of column I correctly with the phrases given in column II:
‘Manufacturing synthetic fibres is actually helping conservation of forests’.
Comment.
Describe an activity to show that thermoplastic is a poor conductor of electricity.
What are natural fibres?
Give two examples of natural fibres.
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