- Technical Blog From My Notebook

Thursday, February 21, 2019

Objective Questions on Basic Electronics- Semiconductor, Integrated Circuits, Logic Gates

Objective Questions on Basic Electronics- Semiconductor, Integrated Circuits, Logic Gates


The study of nature, control and application of electrons
Ans : Electronics
Vacuum tubes work on the principle of 
Ans : Thermionic emission 
The simplest form of a vacuum tube 
Ans : Diode
The device used to convert alternating current (AC) to Direct Current (DC) 
Ans : Rectifiers 
The device which converts DC energy into AC energy
Ans : Electronic oscillator 
The process which makes the current to pass in the same direction is called 
Ans : Rectification
Now thermionic valves are completely replaced by
Ans : Transistors
Miracle child of electronics 
Ans : Transistor 
Triode was invented by 
Ans : Lee De Forest 
Element used in solar cells 
Ans : Silicon


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)


Solar cells (silicon)    transistors
diodes    Integrated circuits (IC)


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


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 


The circuits that act as transistors, diodes, resistors etc is called
Ans : Integrated Circuits 
'IC' chips are made up of
Ans : Silicon or Germanium 
IC was invented by 
Ans : Jack Kilby
IC chip using Silicon was invented by 
Ans : Robert Noyce


The electronic circuit which works only on two voltage levels (0 and 1) is called 
Ans : Gates


1. AND Gate 
2. OR Gate 
3. NOT gate
Universal logics are - NAND, NOR
Voltage levels In a circuit is either represented by
Ans : '1' or '0'
The level '1' represents
Ans : High voltage level
The level '0' represents
Ans : Zero voltage level

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