Physics
When the main switch of the house is put off it disconnects the

Live wire and the earth wire
Live wire only
Earth wire and the neutral wire
Live wire and the neutral wire

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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 :

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

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