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.
2. A reverse biased pn junction has resistance of the order of________________?
O
KO
MO
None of the above
3. A reverse bias pn junction has_____________?
Very narrow depletion layer
Almost no current
Very low resistance
Large current flow
Answer & Solution
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4. The barrier voltage at a pn junction for germanium is about________________?
5 V
3 V
Zero
0.3 V
5. The random motion of holes and free electrons due to thermal agitation is called______________?
Diffusion
Pressure
Ionisation
None of the above
Answer & Solution
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6. A hole and electron in close proximity would tend to________________?
Repel each other
Attract each other
Have no effect on each other
None of the above
Answer & Solution
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7. The battery connections required to forward bias a pn junction are_________________?
+ve terminal to p and –ve terminal to n
-ve terminal to p and +ve terminal to n
-ve terminal to p and –ve terminal to n
None of the above
Answer & Solution
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8. In the depletion region of a pn junction, there is a shortage of_________________?
Acceptor ions
Holes and electrons
Donor ions
None of the above
Answer & Solution
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9. A pn junction acts as a__________________?
Controlled switch
Bidirectional switch
Unidirectional switch
None of the above
Answer & Solution
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10. In an intrinsic semiconductor, the number of free electrons_____________?
Equals the number of holes
Is greater than the number of holes
Is less than the number of holes
None of the above
Answer & Solution
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11. When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on_________________?
Junction capacitance
Minority carriers
Majority carriers
None of the above
Answer & Solution
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12. The leakage current in a pn junction is of the order of________________?
Aa
MA
KA
µA
13. The leakage current across a pn junction is due to________________?
Minority carriers
Majority carriers
Junction capacitance
None of the above
Answer & Solution
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14. With forward bias to a pn junction , the width of depletion layer__________________?
Decreases
Increases
Remains the same
None of the above
Answer & Solution
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15. At room temperature, an intrinsic semiconductor has_______________?
Many holes only
A few free electrons and holes
Many free electrons only
No holes or free electrons
Answer & Solution
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