Semiconductor Electronics: Materials, Devices and Simple Circuits Class 12 MCQs Questions with Answers

1. The relation between number of free electrons (n) in a semiconductor and temperature (T) is given by:

2. The energy band gap is maximum in which of the following?

3. In an n-p-n transistor circuit the collector current is 18 mA. If 90% of the electrons emitted reach the collector, than the emitter current is:1.6 mA

4. If the conductivity of a semiconductor is only due to break of the covalent band due to the thermal excitation, then the semiconductor is called:

5.  
 In good conducrors of electricity the type of bonding that exist is

6. Winch of the following gate is not an universal gate?

7.  
Diffusion current in a p-n junction is greater than the drift
current in magnitude

8.  
Region without free electrons and holes in a p-n junction is

9.  
At which temperature, a pure semiconductor behaves slightly as a conductor?

10. Energy bands in solids are a consequence of:

11. The Voltage gain is highest for

12. The mobility of conduction electrons is greater than that of holes since electrons is greater than that of holes since electrons.

13. On applying reverse bias to a junction diode, it:

14. Semiconductors of both p-type and n-type are produced by:

15. p-n junction diode can be used as:

16. A p-type semiconductor is:

17.  
Let nh and ne be the number of holes and conduction electrons in an extrinsic semiconductor. Then

18.  
What is a rectifier used for?

19. An oscillator is an amplifier with:

20. In principle, Boolean algerbra is based on: