Semiconductors

Q.

Why intrinsic semiconductors are called P type semiconductor?

Q.

Which of the following are true for n type semiconductor?

1. There are doped with ${15}^{th}$ group elements (Arsenic & Phosphorous)

2. They are doped with ${13}^{th}$ group elements(Boron and Aluminium

3. They have holes which helps in conduct electricity.

4. They have free $e^{-}$ which helps in conduct electricity.

Q. What type of semiconductor will form, when a pentavalent impurity is doped in a crystal lattice of germanium?

Q. Doping of silicon (Si) with Arsenic (As) leads to

1. n-type semiconductor
2. p-type semiconductor
3. Metal
4. Insulator

Q. Doping of silicon (Si) with Arsenic (As) leads to

1. n-type semiconductor
2. p-type semiconductor
3. Metal
4. Insulator

Q. Silicon doped with group 13 and group 15 elements are called as _______ semi conductors

1. p-type, n-type
   
2. n-type, p-type
3. p-type
   
4. n-type

Q. Match the following conductivity range in ${\Omega }^{-1}{m}^{-1}$ of materials

1. ${10}^{-6}-{10}^4$
2. ${10}^4-{10}^7$

3. ${10}^{-20}-{10}^{-10}$

Q.

Germanium or silicon becomes extrinsic semi-conductor due to

1. schottky defect

2. chemicals

3. Frenkel defect

4. Both (a) and (b)

Q.

Which are true about p-type of semiconductor?

1. There are doped with ${15}^{th}$ group elements (Arsenic & Phosphorous)

2. They are doped with ${13}^{th}$ group elements(Boron and Aluminium)

3. They have holes which helps in conduct electricity.

4. They have free $e^{-}$ which helps in conduct electricity.

Q.

Reason for doping of impurities in semiconductors is to

1. Increase the hardness of semiconductor

2. Increase the conductivity of semiconductor

3. to increase magnetic properties

4. none of these