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.

Shining black
Rough white
Rough black
Shining white

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Physics
The blue colour of sky is due to

Refraction of sunlight
Scattering of longer wavelengths of sunlight in the atmosphere
Reflection of sunlight
Scattering of shorter wavelengths of sunlight in the atmosphere

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