Physics
Specific gravity is defined as the ratio of

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

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Physics
Solar eclipse will take place when

the sun is between the moon and the earth
the moon does not lie on the line joining the sun and the earth
the earth is between the moon and the sun
the moon is between the sun and the earth

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