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Question 6:, , Explain the difference between thermoplastic and thermosetting, plastics., , Answer:, , There are two types of plastics: Thermosetting plastics and, Thermoplastics., , , , Thermosetting plastic Thermoplastic, , , , Thermosetting plastic cannot be bent, , easily. It may break when forced to Thermoplastic can be bent, , , , , , , , , , , , , , , , , , , , bend. easily., , Thermosetting plastic cannot be Thermoplastic can be, softened by heating. Thus, it cannot be |softened easily by heating., reshaped once moulded. Thus, it can be reshaped., Question 7:, , Explain why the following are made of thermosetting plastics., (a) Saucepan handles, (b) Electric plugs/switches/plug boards, , Answer:, , (a) Saucepan handles are made of thermosetting plastics because these, plastics do not get softened on heating. Also, thermosetting plastics, such as bakelite are poor conductors of heat., , (b) Thermosetting plastics such as bakelite are poor conductors of heat, and electricity. Therefore, they are used for making electric plugs,, switches, plug boards, etc.