Physics
In which of the following processes is energy released ?

Ingestion
Respiration
Absorption
Photosynthesis

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

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Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

density of mercury is greater than that of water.
mercury is a metal.
cohesion of water is greater than its adhesion with glass.
cohesion of mercury is greater than its adhesion with glass.

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