Physics
Sun appears red in colour at sunrise and sunset due to

The fact that sun emits only red colour at that time
That all other colours scatter away except red
That sun comes out of the mountains
Red light having longer wave length scatters away

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

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