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.
It follows the wave path near the tropopause at elevations of 8 km to 15 km.
Jet streams are typically continuous over long distances.
It is narrow band of high-velocity wind.

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Physics
The nature of fuse wire is

High resistance and high melting point.
Low resistance and low melting point.
Low resistance and high melting point.
High resistance and low melting point.

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