Physics
A NOT gate can be implemented by:

A single transistor
A single resistor
Two diodes
A single diode

ANSWER DOWNLOAD EXAMIANS APP

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

ANSWER DOWNLOAD EXAMIANS APP