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. 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

3.  
At which temperature, a pure semiconductor behaves slightly as a conductor?

4.  
Region without free electrons and holes in a p-n junction is

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

6. In principle, Boolean algerbra is based on:

7.  
What is a rectifier used for?

8.  
 In good conducrors of electricity the type of bonding that exist is

9. An oscillator is an amplifier with:

10. A p-type semiconductor is:

11. Energy bands in solids are a consequence of:

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

13. 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:

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

15. The Voltage gain is highest for

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

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

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

19.  
Let nh and ne be the number of holes and conduction electrons in an extrinsic semiconductor. Then

20.  
Diffusion current in a p-n junction is greater than the drift
current in magnitude