Physics
Certain substances loose their electrical resistance completely at super low temperature. Such substances are called.

Superconductors
Semi conductors
Dielectrics
Perfect conductors

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Physics
The nature of fuse wire is

Low resistance and low melting point.
Low resistance and high melting point.
High resistance and low melting point.
High resistance and high melting point.

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Physics
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

plastics have a higher thermal conductivity than metals
plastics have a lower density than metals
metals have higher thermal capacity than plastics
metals are good conductor of heat

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