Physics
When a piece of pure silicon is doped with aluminium, then

The doped silicon piece will become p-type
The doped silicon piece will become n-type
The conductivity of the doped silicon piece will remain the same
The resistivity of the doped silicon piece will increase

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

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