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#1 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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#2 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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#3 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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#4 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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#5 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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#6 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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#7 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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#8 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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#9 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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#10 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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#11 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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#12 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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#13 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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#14 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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#15 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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#16 Class 12 Physics Semiconductor 2020 Mcq 1M CBSE
The formation of depletion region in a p-n junction diode is due to
A. movement of dopant atoms
B. diffusion of both electrons and holes
C. drift of electrons only
D. drift of holes only
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#17 Class 12 Physics Semiconductor 2021 Short 2M CBSE
In an extrinsic semiconductor, the number density of holes is $4 \times 10^{20}$ m$^{-3}$. If the number density of intrinsic carriers is $1.2 \times 10^{45}$ m$^{-3}$, find the number density of electrons in it.
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#18 Class 12 Physics Nuclei 2022 Short 2M CBSE
What is the nuclear radius of $^{125}$Fe, if that of $^{27}$Al is 3.6 fermi?
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#19 Class 12 Physics Nuclei 2023 Short 5M CBSE
A coin has a mass of 3.0 g and is entirely made of $^{63}_{29}$Cu atoms (mass 62.92960 u). Calculate the nuclear energy required to separate all neutrons and protons from each other. Given: $m_p = 1.007825$ u, $m_n = ...
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#20 Class 12 Physics Nuclei 2022 Short 2M CBSE
Binding energy per nucleon vs mass number curve for nuclei is shown in the figure. W, X, Y and Z are four nuclei indicated on the curve. Identify which nucleus is most likely to undergo: (i) Nuclear Fission, (ii) Nucl...
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