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WorksheetsQuiz 3
Total questions: 18
Worksheet time: 9mins
Doping of Semiconductors
materials which can conduct electricity better than insulator, but not as well as conductors.
The process of adding of a certain amount of specific impurities atoms in the pure semiconductor.
when 4 electrons in outermost orbit.
Which of the following statements is NOT the diode application in electronic circuit?
Diode as voltage regulator
Diode as Rectifier
Diode as Amplifier
Diode as solar cell
A full-wave rectifier consist of _______________________________
1 Diode
2 Diode
3 Diode
4 Diode
Basic building blocks of all electronic circuits are
Devices in which there is a flow of electrons
devices in which there is no flow of electrons
devices in which there is a controlled flow of electrons
devices in which there is an uncontrolled flow of electrons
conductivity of semiconductor increases with increase in temperature, because
number density of free charge carriers increases
relaxation time increases
both number density of free charge carriers and relaxation time increases
number density of free charge carriers increases relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density
Let np and ne be the number density of holes and conduction electrons respectively in a semiconductor. Then,
np > ne in an intrinsic semiconductor, I < Ip + Ie
np = ne in an extrinsic semiconductor, I > Ip + Ie
np = ne in an intrinsic semiconductor, I = Ip + Ie
np > ne in an intrinsic semiconductor, I = 0( Here, Ip = current due to holes,Ie= current due to electrons, I= total current)
During formation of p-n junction
an electron diffuses from n to p side
a hole diffuses from p to n side
a hole diffuses from n to p side
an electron diffuses from p to n side
A semiconductor has generally ……………… valence electrons.
2
3
6
4
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
Which among these is NOT a semiconductor
Germanium
Silicon
Gallium Arsenide
Titanium
The forbidden energy gap for Silicon is of the order of
0.7 eV
0.3 eV
1.1 eV
10 eV
With forward bias to a pn junction , the width of depletion layer ………
Decreases
Increases
Remains the same
None of the above
In semiconductors like silicon, the unit cell is
a simple cubic
body centred cube
face centred cube
hexagonal
Electronic distribution of an Si atom is
2,10,2
2,8,4
2,7,5
2,4,8
There is no hole current in good conductors because they
are full of electron gas
have large forbidden energy gap
have no valance band
have overlapping valance and conduction bands
