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WorksheetsSemiconductors
Total questions: 25
Worksheet time: 13mins
In solids, _________in outer most orbits of atoms determine its electrical properties
protons
neutron
electrons
positron
Free electron theory has been developed in ----------- main stages
1
2
3
5
This theory was developed by Drude & Lorentz in 1900
Classical free electron theory
Quantum free electron theory
Zone theory
Bloch theory
According to this theory, free electrons move in a periodic potential provided by the lattice
Classical free electron theory
Quantum free electron theory
free electron theory
zone theory
Electron occupying an energy level can be determined by
probability function F(E)
probability function Z(E)
Normalized function F(E)
Occupation function N(E)
Highest energy level that can be occupied by an electron at 0 K
Excited state
Conduction state
Fermi energy
Average energy
If F(E) =1, then
0% probability that the electrons to occupy energy level below Fermi level
50% probability that the electrons to occupy energy level below Fermi level
75% probability that the electrons to occupy energy level below Fermi level
100% probability that the electrons to occupy energy level below Fermi level
Carrier concentration in metals is
ZE x FE
Z(E) x F(E) dE
N(E)dE x F(E) dE
Z(E)dE
When an electric field is applied to the metal, the free electrons move in (a) direction
Wolfgang Pauli formulated the law stating that ____ electrons can have the same set of quantum numbers.
no two
only two
only one
no one
In density of states, the shape of metal piece considered initially was
sphere
shell
cube
cylinder
In DOS, volume of the sphere of radius n is equal to the
volume of cube
number of energy states
number of energy levels
none in the list
Materials which can conduct electricity better than insulator,but not as well as conductors. This is the definition of
diode
semiconductor
conductor
insulator
superconductor
Which is not one of the properties of semiconductor?
4 electrons in outermost orbit, in covalent bonding.
atoms vibrate causes electron to break free from the bonds.
Electron free leaves hole.
Semiconductor has 2 types of charge carriers.
all of the above are the properties of it
These are the characteristics of Trivalent impurities except
•3 valence electrons
•produce p-type semiconductors
•producing a "hole".
Antimony, arsenic, and phosphorus are the examples
The characteristics of p-type semiconductors include
Majority carriers are electron
Has tendency to gain electron
Has tendency to donor electron
Easy to conduct electricity
The process of adding an impurity to an intrinsic semiconductor is called
Doping
Ionization
Recombination
Atomic modification
What is the most common semiconductor material used for producing integrated circuits
Quartz
Silicon
Diamond
Tantalum
Which among these is NOT the property of a semiconductor?
Four electrons in the valence band forming covalent bonds
At 0 Kelvin semiconductor acts like an insulator
Semiconductors have two type of charge carriers
Semiconductors are temperature insensitive
Which among these is NOT a semiconductor
Germanium
Silicon
Gallium Arsenide
Titanium
Electrons and holes are equal in magnitude but opposite in polarity
True
False
The maximum energy that an electron in a metal has at the absolute zero temperature is called
(a)
The ratio of majority and minority charge carriers in intrinsic semiconductors is unity
True
False
What is the name of this component?
PN junction
LED
silicon
PNP
