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

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

2. A p-type semiconductor is:

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

4. An oscillator is an amplifier with:

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

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

7.  
What is a rectifier used for?

8. In principle, Boolean algerbra is based on:

9.  
Region without free electrons and holes in a p-n junction is

10.  
At which temperature, a pure semiconductor behaves slightly as a conductor?

11. 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

12. The Voltage gain is highest for

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

14. Energy bands in solids are a consequence of:

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

16. 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:

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

18.  
Let nh and ne be the number of holes and conduction electrons in an extrinsic semiconductor. Then

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

20.  
 In good conducrors of electricity the type of bonding that exist is