Physics
What is the name of the device used to convert alternating current into direct current ?

Ammeter
Rectifier
Transformer
Galvanometer

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

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

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