Electrical Engineering MCQs

Page No. 36

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


a Remains the same


bIncreases


cDecreases


dNone of the above


View Answer Decreases

A hole in a semiconductor is defined as_________________?


aA free electron


bThe incomplete part of an electron pair bond


c A free proton


dA free neutron



A trivalent impurity has______________valence electrons?


a4


b 5


c6


d3


View Answer 3

The strength of a semiconductor crystal comes from______________?


aForces between nuclei


bForces between protons


cElectron-pair bonds


dNone of the above


View Answer Electron-pair bonds

A semiconductor is formed by ______________bonds?


aCovalent


bElectrovalent


cCo-ordinate


dNone of the above


View Answer Covalent

The resistivity of a pure silicon is about _______________?


a100 O cm


b6000 O cm


c3 x 105 O m


d 6 x 10-8 O cm


View Answer 6000 O cm

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


aAn insulator


bAn intrinsic semiconductor


c p-type semiconductor


dn-type semiconductor


View Answer n-type semiconductor

An n-type semiconductor is______________?


aPositively charged


bNegatively charged


cElectrically neutral


dNone of the above


View Answer Electrically neutral

Addition of pentavalent impurity to a semiconductor creates many________________?


aFree electrons


bHoles


c Valence electrons


d Bound electrons


View Answer Free electrons

When a pure semiconductor is heated, its resistance_________________?


aGoes up


b Goes down


cRemains the same


d Can’t say


View Answer Goes down

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