Multiple Choice Questions and Answers on Semiconductor Theory

Q21. A forward biased pn junction diode has a resistance of the order of

1. Ω
2. kΩ
3. MΩ
4. None of the above

Answer : 1

Q22. The battery connections required to forward bias a pn junction are ……

1. +ve terminal to p and –ve terminal to n
2. -ve terminal to p and +ve terminal to n
3. -ve terminal to p and –ve terminal to n
4. None of the above

Answer : 1

Q23. The barrier voltage at a pn junction for germanium is about ………

3. 5 V
4. 3 V
5. Zero
6. 3 V

Answer : 4

Q24. In the depletion region of a pn junction, there is a shortage of ……..

1. Acceptor ions
2. Holes and electrons
3. Donor ions
4. None of the above

Answer : 2

Q25. A reverse bias pn junction has …………

1. Very narrow depletion layer
2. Almost no current
3. Very low resistance
4. Large current flow

Answer : 2

Q26. A pn junction acts as a ……….

1. Controlled switch
2. Bidirectional switch
3. Unidirectional switch
4. None of the above

Answer : 3

Q27. A reverse biased pn junction has resistance of the order of

1. Ω
2. kΩ
3. MΩ
4. None of the above

Answer : 3

Q28. The leakage current across a pn junction is due to …………..

1. Minority carriers
2. Majority carriers
3. Junction capacitance
4. None of the above

Answer : 1

Q29. When the temperature of an extrinsic semiconductor is increased, the pronounced effect is on……

1. Junction capacitance
2. Minority carriers
3. Majority carriers
4. None of the above

Answer : 2

Q30. With forward bias to a pn junction , the width of depletion layer ………

1. Decreases
2. Increases
3. Remains the same
4. None of the above

Answer : 1