Physics
Water will not be vapourised if

The humidity is 0%
The humidity is 100%
The temperature is 100°C
The temperature is 0°C

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Physics
A dynamo is used to convert

Mechanical energy into electrical energy
Electrical energy into mechanical energy
Electrical energy into magnetic energy
Magnetic energy into mechanical energy

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

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