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 :

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

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Physics
The mass defect is the result of what action occurring?

Mass being converted to energy when protons and neutrons bind together in a nucleus
Energy being converted into moles of atoms when neutrons break apart protons
Protons and electrons being attracted to each other
Mass being converted to energy when protons and neutrons break apart in a nucleus

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