Physics
An ice block with a piece of lead embeded in it floats in water. If ice melts the water level

Falls
Rises
Remains same
Falls first and then rises

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Physics
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

Two thin shirts become thicker so prevent transmission of heat
Air layer between two shirts behaves like insulating media
Air layer between two shirts works as good conductor
No radiation of heat takes place

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