Physics
A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks overboard. The level of water in the pool will

Increase
Decrease
Remains the same
First decrease and then increase

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

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

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Physics
Planets are

luminous heavenly bodies revolving around a star
luminous heavenly bodies that do not twinkle
luminous heavenly bodies that twinkle
non-luminous heavenly bodies

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