Physics
Purity of a metal can be determined with the help of

Boyle's law
Pascal's law
Archimedes principle
Conservation of mass principle

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

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Physics
A Fuse wire is characterised by

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

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