Physics
In hydro power station, the motion produced in turbines is due to

Flow of water
Burning of diesel
Burning of coal
Production of steam

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Physics
Acceleration is

Directly proportional to force
Directly proportional to mass
Inversely proportional to mass
Inversely proportional to force

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

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

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