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Let and be the number of holes and conduction electrons respectively in a semiconductor. Then
(c) In intrinsic semiconductors, the creation or liberation of one free electron by the thermal energy has created one hole. Thus in intrinsic semiconductors =
Wires P and Q have the same resistance at ordinary (room) temperature. When heated, resistance of P increases and that of Q decreases. We conclude that
(d) Conductor has positive temperature coefficient of resistance but semiconductor has negative temperature coefficient of resistance.
In extrinsic P and N-type, semiconductor materials, the ratio of the impurity atoms to the pure semiconductor atoms is about
(d) In extrinsic semiconductors, impurity atoms are mixed per single atom of pure semiconductor.
The forbidden gap in the energy bands of germanium at room temperature is about
(c)
In P-type semiconductor the majority and minority charge carriers are respectively
(d) In P-type semiconductors, holes are majority charge carrier and electrons are minority charge carriers
At zero Kelvin a piece of germanium
(c) At zero Kelvin, there is no thermal agitation and therefore no electrons from valence band are able to shift to conduction band.
A semiconductor is cooled from to . Its resistance
(b) Resistance of semiconductor ∝
In intrinsic semiconductor at room temperature, number of electrons and holes are
(a) At room temperature the number of electrons and holes are equal in the intrinsic semiconductor.
In a semiconductor the separation between conduction band and valence band is of the order of
(c) In semiconductors, Forbidden energy gap is of the order of 1 eV.
The intrinsic semiconductor becomes an insulator at
(d) At 0K temperature semiconductor behaves as an insulator, because at very low temperature electrons cannot jump from the valence band to conduction band.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.