Physics
A person standing on a railway platform listens to the whistles of arriving and departing trains. The whistle heard is

Of higher pitch when train arrives
Of higher intensity when train arrives
Of higher pitch when train departs
The same in both cases in all respects

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

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Physics
The Hooke's law is valid for

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

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