Physics
When a ship enters the sea from a river

It rises a little
It remains at the same level
It rises or sinks depending on the material it is made of
It sinks a little

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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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