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

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

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Physics
What is a compound microscope?

A microscope that has two sets of lenses : an occular lens and an eyepiece.
A microscope whose lenses are concave.
A microscope that has one lens.
A microscope whose lenses are convex.

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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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