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

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Physics
Solids have definite shapes.This is because

The forces of adhesion are large
The forces of cohesion of the molecules within are very much less in them
The forces of adhesion are less
The forces of cohesion are very large

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