Semiconductor Devices — Important Questions
Telangana Open School (TOSS) · Class 12 · Physics
46 important questions from Semiconductor Devices for Telangana Open School (TOSS) Class 12 Physics, with answers. Written for the board exams 2027.
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Important Questions from Semiconductor Devices
What is the unit of energy gap in semiconductors?
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Electron volt (eV)
The energy gap between valence and conduction bands is measured in electron volts (eV), a standard unit in semiconductor physics.
In an intrinsic semiconductor, the number of electrons and holes are:
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Equal
In intrinsic semiconductors, electron-hole pairs are generated in pairs due to thermal energy, so the number of electrons equals the number of holes.
Doping is the process of adding impurities to a pure semiconductor to:
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Modify its electrical properties
Doping introduces extra charge carriers (electrons or holes), thereby changing the conductivity and making the semiconductor extrinsic.
Which group of elements is used for doping to create n-type semiconductors?
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Group V
Pentavalent impurities from Group V (like phosphorus) provide extra electrons, forming n-type semiconductors.
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