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

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Physics
Specific gravity is defined as the ratio of

Density of the substance to the density of water at 0°C
Density of the substance to the density of water at 4°C
Density of the substance to the density of water
Density of water at 4°C to the density of the substance

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