Physics
Super conductors are substances that

Offer high resistance to the flow of electric current
Conduct electricity at high temperature
Offer minimum resistance to flow of electric current
Conduct electricity at low temperature

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

Plastics have a lower density than metals
Plastics have a higher thermal conductivity than metals
Metals have higher thermal capacity than plastics
Metals are good conductors of heat

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