Semiconductor Theory

11. A trivalent impurity has ___________ valence electrons

1. 4
2. 5
3. 6
4. 3

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12. Addition of pentavalent impurity to a semiconductor creates many ___________

1. Free electrons
2. Holes
3. Valence electrons
4. Bound electrons

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13. Addition of trivalent impurity to a semiconductor creates many ___________

1. Holes
2. Free electrons
3. Valence electrons
4. Bound electrons

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14. An n-type semiconductor is ___________

1. Positively charged
2. Negatively charged
3. Electrically neutral
4. None of the above

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15. As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor ___________

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

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16. At absolute temperature, an intrinsic semiconductor has ___________

1. A few free electrons
2. Many holes
3. Many free electrons
4. No holes or free electrons

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17. At room temperature, an intrinsic semiconductor has ___________

1. Many holes only
2. A few free electrons and holes
3. Many free electrons only
4. No holes or free electrons

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18. At room temperature, an intrinsic silicon crystal acts approximately as ___________

1. A battery
2. A conductor
3. An insulator
4. A piece of copper wire

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19. In a semiconductor, current conduction is due to ___________

1. Only holes
2. Only free electrons
3. Holes and free electrons
4. None of the above

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20. In an intrinsic semiconductor, the number of free electrons ___________

1. Equals the number of holes
2. Is greater than the number of holes
3. Is less than the number of holes
4. None of the above

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