Physics
Super cooling stands for cooling of a liquid :

Above melting point
At freezing point
Below freezing point
At melting point

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

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

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