Physics
The blue colour of sky is due to

Reflection of sunlight
Scattering of shorter wavelengths of sunlight in the atmosphere
Refraction of sunlight
Scattering of longer wavelengths of sunlight in the atmosphere

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Physics
The Hooke's law is valid for

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

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