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

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
The doped silicon piece will become p-type

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Physics
Acceleration is

Inversely proportional to force
Inversely proportional to mass
Directly proportional to mass
Directly proportional to force

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