# Mcqs of Energy band | Electronics | Silicon

Mcqs of energy band, silicon, and energy levels of the 4th chapter which is most important. Usually, this type of Mcqs comes in job tests not all of them but 2 or 3 from this post. these Mcqs of (energy band) are prepared for the learners who are now trying to get a job.

## Mcqs of Electronics, energy band and silicon

1. The electrons in the 3rd orbit of an atom have …….. energy than the electrons in the 2nd orbit.
(i) more (ii) less
(iii) the same (iv) none of the above
2. When an electron jumps from higher or larger orbit to a lower orbit, it …….. energy.
(i) absorbs (ii) emits
(iii) sometimes emits, sometimes absorbs
(iv) none of the above
3. Which of the following is quantized according to Bohr’s atomic theory of atom?
(i) linear momentum of the electron
(ii) the linear velocity of the electron
(iii) angular momentum of an electron
(iv) angular velocity of an electron
4. A semiconductor has …….. band.
(i) almost empty valence
(ii) almost empty conduction
(iii) almost full conduction
(iv) none of the above
5. The electrons in the conduction band are called ……..
(i) bound electrons (ii) valence electrons (iii) free electrons (iv) none of the above
1. In insulators, the energy gap between conduction bands and valence bands is ……..
(i) very large (ii) zero
(iii) very small (iv) none of the above
2. In a conductor, the energy gap between conduction bands and valence bands is ……..
(i) large (ii) very large
(iii) very small (iv) none of the above
3. According to Bohr’s theory of the atom, an electron can jump in an orbit of ……..
(iii) some range of radii
(iv) none of the above
4. In a semiconductor, the energy gap between conduction bands and valence bands is about ……..
(i) 15 eV (ii) 100 eV
(iii) 50 eV (iv) 1 eV
5. The energy gap between conduction bands and valence bands in insulators is about ……..
(i) 15 eV (ii) 1.5 eV
(iii) zero (iv) 0.5 eV

## Chapter Review Topics of Electronics, Energy levels and Silicon

1. Explain the salient features of Bohr’s model.
2. Explain the concept of energy bands and energy levels in solids.
3. Describe the conduction band, valence band, and forbidden energy gap with the help of the energy level diagram.
4. Give the energy band description of conductors, insulators, and semiconductors

## Discussion Questions of Electronics, Energy levels, and Silicon

1. Why is the energy of an electron greater in higher orbits?
2. What is the concept of energy band?
3. Why do conduction band electrons possess very huge energy?
4. Why are valence electrons of substance is so important?
5. What is the difference between the energy level and the energy band?

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