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.
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
Answer & Solution
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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
Answer & Solution
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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
21. The most commonly used semiconductor is________________?
Germanium
Silicon
Carbon
Sulphur
22. A pentavalent impurity has______________Valence electrons?
3
5
4
6
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
Answer & Solution
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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
Answer & Solution
C
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26. A trivalent impurity has______________valence electrons?
4
5
6
3
27. The strength of a semiconductor crystal comes from______________?
Forces between nuclei
Forces between protons
Electron-pair bonds
None of the above
Answer & Solution
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28. A semiconductor is formed by ______________bonds?
Covalent
Electrovalent
Co-ordinate
None of the above
Answer & Solution
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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
Answer & Solution
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30. When a pentavalent impurity is added to a pure semiconductor, it becomes________________?
An insulator
An intrinsic semiconductor
P-type semiconductor
N-type semiconductor
Answer & Solution
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