SEMICONDUCTORS Important Question

 

SEMICONDUCTORS Important Question

*Materials whose conductivity lies between conductors and insulators

Ans : Semi conductors

*Examples of semiconductors are

Ans : Germanium, Silicon

*Semi conductor in pure state is called

Ans : Intrinsic Semiconductors

*In intrinsic, number of holes is equal to number of

Ans : Electrons

*The process to improve conductivity 

Ans : Doping

*Process of adding controlled impurities to a pure semiconductor is known as 

Ans : Doping

*The substances used for doping 

Ans : Dopants

*An intrinsic semiconductor undergoes doping, change into

Ans : Extrinsic semiconductor 

*Extrinsic are of two types:

(1)N-type semiconductor

(2)P-type semiconductor In N-type, charge carriers are

Ans : Electrons

*An intrinsic semiconductors have

*Trivalent impurity (eg: Boron, Gallium)

*Pentavalent impurity (eg: Antimony, Arsenic)

■ SEMI CONDUCTORS ARE USED MAINLY IN 

* Solar cells (silicon)    *transistors

*diodes    *Integrated circuits (IC)

DIODE

*The electronic device which has semiconducting property that allows current to flow in one direction 

Ans : Diode

*Diode is mostly used to convert 

Ans : AC to DC 

*Diode is used as a 

Ans : Rectifier

*Zener diode is used as 

Ans : Voltage regulator

TRANSISTOR

*A semiconductor device used to amplify or switch electronic signals and electrical power

Ans : Transistor

*Transistor is operated at low temperatures and voltages.

*Three regions of a transistor

Ans : Emitter, Base, Collector 

*Transistor transfers a signal from a low resistance to

Ans : High resistance 

*Transistor was invented by

Ans : John Bardeen, W.H. Brattain and William Shockley 

*Electronic intelligene is called 

Ans : ELINT

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