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

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

2. In principle, Boolean algerbra is based on:

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

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

5.  
At which temperature, a pure semiconductor behaves slightly as a conductor?

6.  
Let nh and ne be the number of holes and conduction electrons in an extrinsic semiconductor. Then

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

8.  
Diffusion current in a p-n junction is greater than the drift
current in magnitude

9. An oscillator is an amplifier with:

10. A p-type semiconductor is:

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. Energy bands in solids are a consequence of:

13.  
 In good conducrors of electricity the type of bonding that exist is

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

15. 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:

16.  
What is a rectifier used for?

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

18. The Voltage gain is highest for

19.  
Region without free electrons and holes in a p-n junction is

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