Physics
Hot water is poured simultaneously in four metallic tumblers painted outside with different paints. After some time the water will be found to have cooled most in the tumbler painted.

Rough white
Shining black
Shining white
Rough black

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Physics
A drop of liquid assumes spherical shape because:

A sphere has the least surface area for a given volume
A sphere has the largest surface area for a given volume
Intermolecular forces are strong in liquids
Inter molecular forces are weak in liquids

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