Physics
A dynamo is a device which

Converts electrical energy into mechanical energy
Creates mechanical energy
Converts mechanical energy into electrical energy
Creates electrical energy

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

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

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Physics
Scalar Quantities are

Physical quantities which have no magnitude only and only direction
Physical quantities which have magnitude only and no direction
Physical quantities which have magnitude only and direction
Physical quantities which have no magnitude and no direction

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