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CBSE
Class 12 Physics
Semiconductor Electronics: Materials, Devices And Simple Circuits
Quiz 1
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in a semiconductor :
0%
trivalent
0%
covalent
0%
bivalent
0%
monovalent
Explanation
covalent
Number of electrons in the valence shell of a semiconductor is:
0%
1
0%
2
0%
3
0%
4
Explanation
4
Semiconductors of both p-type and n-type are produced by:
0%
ionic solids
0%
covalent solids
0%
metallic solids
0%
molecular solids
Explanation
covalent solids
With fall of temperature, the forbidden energy gap of a semiconductor
0%
increases
0%
decreases
0%
sometimes increases and sometimes decreases
0%
remains unchanged
Explanation
remains unchanged
In a p-type semiconductor, current conduction is by:
0%
atoms
0%
holes
0%
electrons
0%
protons
Explanation
holes
The relation between number of free electrons (n) in a semiconductor and temperature (T) is given by:
0%
n ∝ T
0%
n ∝ T²
0%
n ∝ T
1/2
0%
n ∝ T
3/2
Explanation
n ∝ T
3/2
In reverse biasing:
0%
large amount of current flows
0%
no current flows
0%
potential barrier across junction increases
0%
depletion layer resistance increases
Explanation
potential barrier across junction increases
Main function of a transistor is to :
0%
rectify
0%
simplify
0%
amplify
0%
all the above
Explanation
amplify
To obtain p-type silicon semiconductor, we need to dope pure silicon with:
0%
aluminium
0%
phosphorus
0%
oxygen
0%
germanium
Explanation
aluminium
On applying reverse bias to a junction diode, it:
0%
lowers the potential barrier
0%
raise the potential barrier
0%
increases the majority carrier current
0%
increases the minority carrier current
Explanation
raise the potential barrier
For germanium crystal, the forbidden energy gap in joules
0%
1.216 × 10
-19
0%
1.76 × 10
-19
0%
1.6 × 10
-19
0%
zero
Explanation
1.216 × 10
-19
To obtain electrons as majority charge carriers in a semiconductors the impurity mixed is:
0%
monovalent
0%
divalent
0%
trivalent
0%
pentavalent
Explanation
divalent
In the middle of the depletion layer of a reverse biased p-n junction, the:
0%
electric field is zero
0%
potential is maximum
0%
electric field is maximum
0%
potential zero.
Explanation
potential zero.
In a common base amplifier the phase difference between the input signal voltage and output voltage is :
0%
π/2
0%
0
0%
π/4
0%
π
Explanation
0
Energy bands in solids are a consequence of:
0%
Ohm's Law
0%
Pauli's exclusion principle
0%
Bohr's theory
0%
Heisenberg's uncertainty principle
Explanation
Pauli's exclusion principle
In semi conductor which are responsible for conduction:
0%
only electron
0%
electron and hole both
0%
only hole
0%
None of these
Explanation
electron and hole both
In binary system III represents:
0%
1
0%
3
0%
7
0%
100
Explanation
7
On heating, resistance of semiconductors:
0%
decreases
0%
increases
0%
remains same
0%
first increases then decreases
Explanation
decreases
p-n junction diode can be used as:
0%
amplifier
0%
oscillator
0%
detector
0%
modulator
Explanation
detector
In intrinsic semiconductor at room temperature, the number of electrons and holes are:
0%
equal
0%
unequal
0%
infinite
0%
zero
Explanation
equal
0 h : 0 m : 1 s
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