Physics
For accurate scientific work, temperatures are often measured by

Mercury thermometers
Alcohol thermometers
Platinum resistance thermometers
Thermoelectric thermometers

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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 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.
It follows the wave path near the tropopause at elevations of 8 km to 15 km.

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