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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Physics
Ice is packed in saw dust because

Saw dust does not stick to the ice.
Saw dust will not get melted easily.
Saw dust is poor conductor of heat.
Saw dust is a good conductor of heat.

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