Physics
The recoiling of gun is an example of which of the following?

Law of Conservation of Angular Momentum
Conversion of Kinetic Energy to Potential Energy
Law of Conservation of Energy
Law of Conservation of Linear Momentum

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

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