Physics
The Hooke's law is valid for

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

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Physics
Superconductors are those elements

Which turn into insulators at very low temperatures
Whose conductivity is intermediate between metals and insulators
Which conduct electricity only at super-high temperatures
Whose resistance falls almost to zero at very low temperatures

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