Semiconductor Theory Mcqs

This set of Electrical engineering Multiple Choice Questions & Answers (MCQs) focuses on study of “Semiconductor Theory ”. These questions are chosen from a collection of most authoritative and best reference books on Electrical engineering. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, University and College entrance exams, Jobs and interviews. One should practice our MCQS to assimilate Semiconductor Theory comprehensively.

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16.
At room temperature, an intrinsic silicon crystal acts approximately as_______________?

A battery

A conductor

An insulator

A piece of copper wire

17.
A forward biased pn junction diode has a resistance of the order of_____________?

O

KO

MO

None of the above

18.
In a semiconductor, current conduction is due to________________?

Only holes

Only free electrons

Holes and free electrons

None of the above

19.
The impurity level in an extrinsic semiconductor is about_______________of pure semiconductor ?

10 atoms for 108 atoms

1 atom for 108 atoms

1 atom for 104 atoms

1 atom for 100 atoms

20.
The resistivity of pure germanium under standard conditions is about_______________?

6 x 104 cm

60 x cm

3 x 106 cm

6 x 10-4 cm

23.
Addition of trivalent impurity to a semiconductor creates many_______________?

Holes

Free electrons

Valence electrons

Bound electrons

24.
As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor_______________?

Remains the same

Increases

Decreases

None of the above

25.
A hole in a semiconductor is defined as_________________?

A free electron

The incomplete part of an electron pair bond

A free proton

A free neutron

27.
The strength of a semiconductor crystal comes from______________?

Forces between nuclei

Forces between protons

Electron-pair bonds

None of the above

28.
A semiconductor is formed by ______________bonds?

Covalent

Electrovalent

Co-ordinate

None of the above

29.
The resistivity of a pure silicon is about _______________?

100 O cm

6000 O cm

3 x 105 O m

6 x 10-8 O cm

30.
When a pentavalent impurity is added to a pure semiconductor, it becomes________________?

An insulator

An intrinsic semiconductor

P-type semiconductor

N-type semiconductor

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