Physics
The Hooke's law is valid for

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

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Physics
Which one of the following statements with regard to Jet stream, an upper level tropospheric wave, is not correct?

It is narrow band of high-velocity wind.
It follows the wave path near the tropopause at elevations of 8 km to 15 km.
In summer, the polar front jet achieves its maximum force.
Jet streams are typically continuous over long distances.

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