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

Shining black
Shining white
Rough white
Rough black

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Physics
Energy in reflected light :

Does not depends on the angle of incidence
Becomes maximum for angle of incidence equal to 45°
Increases with the increase in angle
Decreases with the increase in angle of incidence

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