Physics
A bullet is fired from a rifle which recoils after firing. The ratio of kinetic energy of the rifle to that of the bullet is

Zero
Less than one
More than one
One

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

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Physics
Why two thin shirts can keep us warmer than a single thick shirt in winter ?

No radiation of heat takes place
Two thin shirts become thicker so prevent transmission of heat
Air layer between two shirts works as good conductor
Air layer between two shirts behaves like insulating media

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