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

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

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Physics
Skating on ice is possible because

Ice is cold
The pressure on the ice due to skate raises its melting point
The surface of ice is smooth
The pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water

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