Semiconductors

Q. Which of the following is most commonly used as a semiconductor?

1. Silicon
2. Carbon
3. Sulphur
4. Germanium

Q.

What is organic semiconductor ? Explain with an example.

Q. Which of the following is an intrinsic semiconductor?

1. 
2. 
3. 
4. 

Q.

Which of the following is the least doped region in a transistor?

1. Base

2. Either emitter or collector

3. Emitter
4. Collector

Q.

Are semiconductors metals?

Q. The resistivity of an intrinsic semiconductor

1. increases with an increase in temperature.
2. decreases with an increase in temperature.
3. is independent of temperature.
4. increases upto a certain temperature and thereafter remains constant.

Q. Why glass rod get positive charge on rubbing with silk cloth and ebonite rod get negative charge on rubbing with fur not other charges

Q. A large flat metal surface has a uniform charge density, sigma. An electron of mass m and charge e leaves the surface at a point A with speed u , returns at B. The maximum value of AB is

Q.

Conductivity can't be increased for semiconductors

1. True

2. False

Q. An electron has negligible mass but then also we say that when a body has charge Its mass will be increased or decreased

Q.

The semiconductor crystal arrangement with n-region in between 2 p-regions takes place in:

1. p-n-p transistor

2. n-p-n transistor

3. np transistor

4. n-p-p transistor

Q. Conductivity of a semiconductor cannot be changed.

1. True
2. Flase