1. Addition of pentavalent impurity to a semiconductor creates many________________?
A. Free electrons
B. Holes
C. Valence electrons
D. Bound electrons
✅ The correct answer is option A.
Semiconductor Theory MCQs
2. A semiconductor has ______________ temperature coefficient of resistance?
A. Positive
B. Zero
C. Negative
D. None of the above
✅ The correct answer is option C.
3. With forward bias to a pn junction , the width of depletion layer__________________?
A. Decreases
B. Increases
C. Remains the same
D. None of the above
✅ The correct answer is option A.
4. In a semiconductor, current conduction is due to________________?
A. Only holes
B. Only free electrons
C. Holes and free electrons
D. None of the above
✅ The correct answer is option C.
5. When a pure semiconductor is heated, its resistance_________________?
A. Goes up
B. Goes down
C. Remains the same
D. Can’t say
✅ The correct answer is option B.
6. At room temperature, an intrinsic semiconductor has_______________?
A. Many holes only
B. A few free electrons and holes
C. Many free electrons only
D. No holes or free electrons
✅ The correct answer is option B.
7. The leakage current in a pn junction is of the order of________________?
A. Aa
B. mA
C. kA
D. µA
✅ The correct answer is option D.
8. When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on_________________?
A. Junction capacitance
B. Minority carriers
C. Majority carriers
D. None of the above
✅ The correct answer is option B.
9. At room temperature, an intrinsic silicon crystal acts approximately as_______________?
A. A battery
B. A conductor
C. An insulator
D. A piece of copper wire
✅ The correct answer is option C.
10. The leakage current across a pn junction is due to________________?
A. Minority carriers
B. Majority carriers
C. Junction capacitance
D. None of the above
✅ The correct answer is option A.