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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Physics
Hydro-electric power is a:

non-renewable natural resource
A mixture of renewable and non-renewable natural resource
Neither renewable nor non renewable resource
Renewable natural resource

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