Objective Questions on Basic Electronics- Semiconductor, Integrated Circuits, Logic Gates
ELECTRONICS
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
SEMI CONDUCTORS
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)
â–
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
INTEGRATED CIRCUITS (IC)
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
GATES
The electronic circuit which works only on two voltage levels (0 and 1) is called
Ans : Gates
LOGIC GATES ARE
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