Physics
A white and smooth surface is

Bad absorber and bad reflector of heat
Bad absorber and good reflector of heat
Good absorber and good reflector of heat
Good absorber and bad reflector of heat

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Physics
Specific gravity is defined as the ratio of

Density of the substance to the density of water at 4°C
Density of water at 4°C to the density of the substance
Density of the substance to the density of water at 0°C
Density of the substance to the density of water

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