Multiple Choice Questions and Answers on Semiconductor Theory

Multiple Choice Questions and Answers on Semiconductor Theory

In addition to reading the questions and answers on my site, I would suggest you to check the following, on amazon, as well:

• Question Bank in Electronics & Communication Engineering by Prem R Chadha
• A Handbook on Electronics Engineering – Illustrated Formulae & Key Theory Concepts

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