Semiconductor E...

Which of the following statement(s) is/are true about holes?

Holes are created when:

The concepts of holes is introduced based on 

In p-type semiconductors, holes are:

Digital circuit can be made by repetitive use of this gate-

In physics, chemistry, and electronic engineering, _______________ is the lack of an electron at a position where one could exist in an atom or atomic lattice.

A semiconductor is a material with a small but non-zero band gap that behaves as an insulator at absolute zero but allows thermal excitation of electrons into its ____________ at temperatures that are below its melting point.

The relationship between band gap energy and temperature can be described by ____________.

What will be the input of $$A$$ and $$B$$ for Boolean expression

 A semiconductor device is connected in a series circuit with a battery and resistance. A current is found to pass through the circuit. If the polarity of the battery is reversed, the current drops almost to zero. The device may be