Questions for Semiconductors (JC) Set 1

When a p-n junction is under reverse bias mode, the width of the depletion region will be increased. Which of the following statements is true?

  1. The applied voltage moves the electrons from n-type region to p-type region.
  2. The applied voltage moves the holes from p-type region to n-type region.
  3. The applied voltage drives the electrons towards n-type region.
  4. The applied voltage drives the holes towards n-type region.

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Answer: 3

Which statement about conduction of electricity in semiconductors is correct?

  1. The presence of impurities in a semiconductor is used to decrease its resistance.
  2. In a semiconductor, there is a large energy gap between the conduction and valence bands.
  3. At low temperatures, free electrons are found both in the conduction band and in the valence band.
  4. In an intrinsic semiconductor, electrons travel in the same direction as the holes.

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Answer: 1

Which of the following statements about semiconductors is true?

  1. The empty energy bands overlap with the bands containing electrons so that current can be conducted.
  2. When an external electric field is applied, both conduction electrons and holes move in the same direction to contribute to current flow.
  3. At temperatures above 0K, some free electrons in the energy gap are free to conduct electricity.
  4. As temperature increases, the resistivity of the material drops.

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Answer: 4

In order to produce a p-n type silicon semi-conductor, how many valence electrons does each of the doping atoms need to have?

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

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Answer: 1

Due to bombardment by light, an electron-hole pair is generated in the depletion layer of a p-n junction. What is the subsequent motion of the electron and the hole?

  1. The electron drifts towards the n side while the hole drifts towards the p side.
  2. The electron diffuses towards the p side while the hole diffuses towards the n side.
  3. The electron and hole move towards the nearest donor ion and acceptor ion respectively.
  4. The electron and hole cannot move because they are in the depletion layer.

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Answer: 1

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