Physics
Scalar Quantities are

Physical quantities which have magnitude only and no direction
Physical quantities which have no magnitude only and only direction
Physical quantities which have no magnitude and no direction
Physical quantities which have magnitude only and direction

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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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