On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

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metals are good conductor of heat

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metals have higher thermal capacity than plastics

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plastics have a lower density than metals

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plastics have a higher thermal conductivity than metals

Q. On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

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