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Question

A good insulator of heat is

A
copper
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B
mercury
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C
trapped air
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D
iron
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Solution

The correct option is C trapped air
A thermal conductor is a material that allows energy in the form of heat, to be transferred within the material, without any movement of the material itself. Eg. Metals.
An insulator is a material that does not allow a transfer of electricity or heat. Materials that are poor thermal conductors can also be described as being good thermal insulators. Eg. trapped air

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