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

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Physics
What is the principle of a ''Life Jacket"?

It decreases the volume of the person to keep him afloat
It provides oxygen to a drowning person
It increases the volume of the person to keep him afloat
The person can sit on it like a raft

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