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

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

2. 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:

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

4.  
Let nh and ne be the number of holes and conduction electrons in an extrinsic semiconductor. Then

5.  
Diffusion current in a p-n junction is greater than the drift
current in magnitude

6. A p-type semiconductor is:

7.  
What is a rectifier used for?

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

9. In principle, Boolean algerbra is based on:

10. 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

11. Energy bands in solids are a consequence of:

12.  
Region without free electrons and holes in a p-n junction is

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

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

15. The Voltage gain is highest for

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

17. An oscillator is an amplifier with:

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

19.  
 In good conducrors of electricity the type of bonding that exist is

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