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WorksheetsFundamentals of Semiconductors
Total questions: 30
Worksheet time: 15mins
Material that posses greater conductivity than insulators but less than that of conductors
Diode
Semiconductor
Conductor
Superconductor
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
The following properties for Trivalent impurities hold good EXCEPT
Three valence electrons
Produces a p type semiconductor
Electrons become the charge carriers
Which among these is the fundamental characteristic of a p type semiconductor
Electrons are the majority charge carriers
Has a tendency to gain an electron
Has a tendency to donate an electron
Easy to conduct electricity
The process of adding an impurity to an intrinsic semiconductor
Ionization
Reconstruction
Doping
Atomic Modification
The most common semiconductor used for producing IC's
Quartz
Silicon
Antimony
Germanium
Method implemented to increase conductivity is
Increase electrical field
Increase temperature
Increase doping concentration
Shining light of proper wavelength on the semiconductor
All of the above
Valence electrons occupy
the orbit closest to the nucleus
The orbit farthest from the nucleus
in various orbits around the nucleus
The current in semiconductors is due to
Electrons
Holes
Ions
Both electrons and holes
Which among these is NOT a semiconductor
Germanium
Silicon
Gallium Arsenide
Titanium
Which of the following DOES NOT hold good for a n type semiconductor
Electron concentration is greater than hole concentration
Obtained by doping an intrinsic semiconductor with a trivalent impurity
Dopants are Phosphorous or Arsenic
Minority charge carriers are holes
Electrons and holes are equal in magnitude but opposite in polarity
True
False
In semiconductors mobility of electrons are higher than holes
True
False
The maximum energy that an electron in a metal has at the absolute zero temperature is called
(a)
The energy gap between the valence band and the conduction band is called
(a)
Which semiconductor has higher conductivity at room temperature
Silicon
Germanium
Gallium Arsenide
Which charge carrier has higher mobility?
Electrons
Holes
Both electrons and holes
The electric current produced due to the steady flow of electrons in one direction is called
(a)
The resistivity of a pure semiconductor
Increases with increase in temperature
Decreases with increase in temperature
Remains unaffected by the changes in temperature
Trivalent impurities are also called
(a)
For the same order or doping which type of semiconductor exhibits higher conductivity
N type semiconductor
P type semiconductor
Both n and p type of semiconductors exhibit the same level of conductivity
Intrinsic semiconductor
The ratio of majority and minority charge carriers in intrinsic semiconductors is unity
True
False
An n type semiconductor is negatively charged
True
False
Electrical conductivity of an extrinsic semiconductor is higher than that of an intrinsic semiconductor
True
False
The velocity with which an electron moves in a semiconductor under the influence of an applied electric field is called
(a)
Doping is done to reduce the resistance of an intrinsic semiconductor
True
False
Doping with Arsenic gives rise to a
N type semiconductor
P type semiconductor
A pentavalent impurity is also called a
Donor impurity
Acceptor impurity
Majority current in N type semiconductors is due to
Electrons
Holes
Both electrons and holes
Acceptor impurity creates a
Covalent bond
Hole
Free electron
