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

1. 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:

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

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

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

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

6. Energy bands in solids are a consequence of:

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

8.  
What is a rectifier used for?

9. A p-type semiconductor is:

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

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

12. An oscillator is an amplifier with:

13.  
At which temperature, a pure semiconductor behaves slightly as a conductor?

14. 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

15.  
 In good conducrors of electricity the type of bonding that exist is

16. In principle, Boolean algerbra is based on:

17. The Voltage gain is highest for

18.  
Region without free electrons and holes in a p-n junction is

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

20.  
Let nh and ne be the number of holes and conduction electrons in an extrinsic semiconductor. Then