Physics
Sun appears red in colour at sunrise and sunset due to

The fact that sun emits only red colour at that time
Red light having longer wave length scatters away
That sun comes out of the mountains
That all other colours scatter away except red

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Physics
The Hooke's law is valid for

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

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