Physics
When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is due to the phenomenon of :

Vaporisation
Diffusion
Evaporation
Sublimation

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Physics
The Hooke's law is valid for

Entire stress strain curve
Entire elastic region of the stress strain curve
Only proportional region of the stress strain curve
Elastic as well as plastic region of the stress strain curve

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