Physics
The optical phenomenon that is primarily responsible for the observation of rainbow on a rainy day is

Dispersion
Interference
Reflection
Diffraction

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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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