SEMICONDUCTOR PHYSICS

As the temperature increases conductivity increases, this is meant for

• positive temperature coefficient of resistance

• negative temperature coefficient of resistance

• neutral temperature coefficient of resistance

• None of the mentioned

Above OK the semiconductor behaves as

• Insulator

• Conductor

• Superconductor

• Semiconductor

The phenomenon of adding impurity atoms to the host atom is

• Catalysing

• Enhancing

• Doping

• None of the above

Find the odd one out

• Extrinsic semiconductor

• n type semiconductor

• p type semiconductor

• intrinsic semiconductor

The majority charge carrier in n-type semiconductor is

• electron

• holes

• electron and holes

• none of the mentioned

The carrier concentration of holes in valence band can be calculated within the energy interval

• Ev and -infinity

• Ec and infinity

• Ec and -infinity

• None of the mentioned

Assertion (A): The intrinsic semiconductor is a pure form of semiconductor

Reason (R): They occur naturally on earth

• Both A and R are true and R is the correct explanation of A.

• B. Both A and R are true, but R is not the correct explanation of A.

• A is true, but R is false.

• A is false, but R is true.

The highest energy level in conduction band and lowest energy in vaence band is represented as

• Ef

• Ev

• E

• Ec

The type of impurity atom added to pure form of semicoductor to get n-type semiconductor is

• pentavalent impurity

• Divalent impurity

• tetravalent impurity

• trivalent impurity

The majority charge carrier in intrinsic semiconductor is

• electron

• holes

• electron and holes

• no charge carrier