Physics
The wall of a dam is broader at the base

To withstand pressure that increases in a horizontal plane
To withstand pressure that is increased with atmospheric pressure
To withstand pressure that increases with depth
Because streamlining is required

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

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

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