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
Absolute Zero is defined as

At which the volume becomes zero
At which water boils at 298K
The temperature at which all molecular motion ceases
At which liquid Helium boils

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