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#1 Class 12 Physics Semiconductor 2020 Short 2M CBSE
Distinguish between n-type and p-type semiconductors.
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#2 Class 12 Physics Semiconductor 2021 Short 2M CBSE
Pure Si at 500 K has equal electron and hole concentration $n_i = 1.5 \times 10^{16}$ m$^{-3}$. Doping by indium increases $n_h$ to $4.5 \times 10^{22}$ m$^{-3}$. Identify the type of doped semiconductor and find the ...
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#3 Class 12 Physics Semiconductor 2022 Long 1M CBSE
Assertion (A): Putting p-type semiconductor slab directly in physical contact with n-type semiconductor slab cannot form a p-n junction. Reason (R): The roughness at the contact will be much more than inter-atomic cry...
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#4 Class 12 Physics Semiconductor 2022 Mcq 1M CBSE
The number of electrons made available for conduction by dopant atoms depends strongly upon
A. doping level
B. increase in ambient temperature
C. energy gap
D. both doping level and temperature
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#5 Class 12 Physics Semiconductor 2023 Long 1M CBSE
Assertion (A): The electrical conductivity of a semiconductor increases on doping. Reason (R): Doping always increases the number of electrons in the semiconductor.
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#6 Class 12 Physics Semiconductor 2022 Long 1M CBSE
Assertion: The number of electrons in a p-type silicon semiconductor is less than the number of electrons in pure silicon at room temperature. Reason: It is due to the law of mass action.
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#7 Class 12 Physics Semiconductor 2021 Long 1M CBSE
Assertion: The value of current through p-n junction in the given figure will be 10 mA. Reason: In the above figure, p-side is at higher potential than n-side.
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#8 Class 12 Physics Semiconductor 2022 Long 1M CBSE
Assertion: The resistivity of a semiconductor decreases with temperature. Reason: The atoms of a semiconductor vibrate with larger amplitude at higher temperatures, thereby decreasing its resistivity.
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#9 Class 12 Physics Semiconductor 2020 Mcq 1M CBSE
Assuming the p-n junction diode shown is ideal, if the circuit has a battery of 2 V and a resistor of 100 $\Omega$ in series with the forward-biased diode, the current through the diode is
A. 0.02 A
B. 2:00 AM
C. 0.2 A
D. 20 A
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#10 Class 12 Physics Semiconductor 2021 Mcq 1M CBSE
In comparison to a half-wave rectifier, the full-wave rectifier gives lower
A. efficiency
B. average current
C. average output voltage
D. none of these
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#11 Class 12 Physics Semiconductor 2020 Mcq 1M CBSE
When the p-end of a p-n junction is connected to the negative terminal and the n-end to the positive terminal of the battery, the p-n junction behaves like a/an
A. insulator
B. conductor
C. semiconductor
D. superconductor
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#12 Class 12 Physics Semiconductor 2021 Mcq 1M CBSE
At 0 K temperature, a p-type semiconductor
A. does not have any charge carrier
B. has few holes and few free electrons
C. has few holes but no free electron
D. has equal number of holes and free electrons
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#13 Class 12 Physics Semiconductor 2019 Mcq 1M CBSE
When the conductivity of a semiconductor is only due to the breaking of covalent bonds, the semiconductor is called
A. extrinsic
B. intrinsic
C. n-type
D. p-type
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#14 Class 12 Physics Semiconductor 2018 Mcq 1M CBSE
A pure semiconductor behaves slightly as a conductor at
A. low temperature
B. high temperature
C. room temperature
D. both (a) and (b)
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#15 Class 12 Physics Semiconductor 2020 Mcq 1M CBSE
With the increase of temperature, the width of the forbidden gap in a semiconductor
A. decreases
B. increases
C. remains same
D. becomes zero
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#16 Class 12 Physics Semiconductor 2019 Mcq 1M CBSE
The impurity atom that should be added to Germanium to make it an n-type semiconductor is
A. iodine
B. indium
C. arsenic
D. aluminium
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#17 Class 12 Physics Semiconductor 2020 Mcq 1M CBSE
The state of energy of the valence electrons when the temperature is raised or when an electric field is applied is called
A. valence band
B. conduction band
C. forbidden band
D. none of these
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#18 Class 12 Physics Semiconductor 2019 Mcq 1M CBSE
The majority current-carrier in a p-type semiconductor is
A. electron
B. hole
C. photon
D. proton
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#19 Class 12 Physics Semiconductor 2018 Mcq 1M CBSE
For n-type Germanium, the impurity doped in Germanium is
A. Trivalent
B. Tetravalent
C. Pentavalent
D. None of these
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#20 Class 12 Physics Semiconductor 2019 Mcq 1M CBSE
A semiconductor is cooled from $T_1$ K to $T_2$ K. Its resistance will
A. increase
B. decrease
C. remain constant
D. first decrease then increase
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