Semiconductor Electronics: Materials, Devices and Simple Circuits MCQs for NEET — Physics Questions with Answers

Practice free Semiconductor Electronics: Materials, Devices and Simple Circuits (Physics) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

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In an insulator, the forbidden energy gap between the valence band and conduction band is of the order of

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Explanation

(d) In insulators, the forbidden energy gap is largest and it is of the order of 15 eV.

A N-type semiconductor is

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Explanation

(c) N-type semiconductors are neutral because neutral atoms are added during doping.

The energy band gap of Si is

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Explanation

(b) The energy band gap for Si=1.1 eV

The forbidden energy band gap in conductors, semiconductors and insulators are EG1,EG2 and EG3 and respectively. The relation among them is

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Explanation

(b) In insulators, the forbidden energy gap is very large, in case of semiconductor it is moderate and in conductors the energy gap is zero.

When Ge crystals are doped with phosphorus atom, then it becomes 

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Explanation

(c) Phosphorus is pentavalent.

Let nP and ne be the number of holes and conduction electrons respectively in a semiconductor. Then

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Explanation

(c) In intrinsic semiconductors, the creation or liberation of one free electron by the thermal energy has created one hole. Thus in intrinsic semiconductors  nP=ne

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

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Explanation

(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 

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Explanation

(d) In extrinsic semiconductors, 10-7 impurity atoms are mixed per single atom of pure semiconductor.

The forbidden gap in the energy bands of germanium at room temperature is about 

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Explanation

(c) Eg(Germanium)=0.67 eV

In P-type semiconductor the majority and minority charge carriers are respectively

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Explanation

(d) In P-type semiconductors, holes are majority charge carrier and electrons are minority charge carriers

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