Physics
Superconductors are those elements

Which conduct electricity only at super-high temperatures
Whose resistance falls almost to zero at very low temperatures
Which turn into insulators at very low temperatures
Whose conductivity is intermediate between metals and insulators

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

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

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