Multiple Choice Questions and Answers on Semiconductor Theory

Multiple Choice Questions and Answers on Semiconductor Theory

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Q1. A semiconductor is formed by ……… bonds.

  1. Covalent
  2. Electrovalent
  3. Co-ordinate
  4. None of the above

Answer : 1

Q2. A semiconductor has ………… temperature coefficient of resistance.

  1. Positive
  2. Zero
  3. Negative
  4. None of the above

Answer : 3

Q3. The most commonly used semiconductor is ………..

  1. Germanium
  2. Silicon
  3. Carbon
  4. Sulphur

Answer : 2

Q4. A semiconductor has generally ……………… valence electrons.

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

Answer : 4

Q5. The resistivity of pure germanium under standard conditions is about ……….

  1. 6 x 104
  2. Ω cm
  3. 60
  4. Ω cm
  5. 3 x 106
  6. Ω cm
  7. 6 x 10-4
  8. Ω cm

Answer : 2

Q6. The resistivity of a pure silicon is about ……………

  1. 100 Ω cm
  2. 6000 Ω cm
  3. 3 x 105 Ω m
  4. 6 x 10-8 Ω cm

Answer : 2

Q7. When a pure semiconductor is heated, its resistance …………..

  1. Goes up
  2. Goes down
  3. Remains the same
  4. Can’t say

Answer : 2

Q8. The strength of a semiconductor crystal comes from ……..

  1. Forces between nuclei
  2. Forces between protons
  3. Electron-pair bonds
  4. None of the above

Answer : 3

Q9. When a pentavalent impurity is added to a pure semiconductor, it becomes ………

  1. An insulator
  2. An intrinsic semiconductor
  3. p-type semiconductor
  4. n-type semiconductor

Answer : 4

Q10. Addition of pentavalent impurity to a semiconductor creates many ……..

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

Answer : 1