physics : class12 Valence Band : Insulators : Electronic Devices MCQ Questions and Answers
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Valence Band
MCQ questions and answers.
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MCQ Questions
1. What is the valence band in a solid?
A.
The highest energy band normally occupied by electrons
B.
The band containing only free electrons
C.
The band with no electrons at absolute zero
D.
The band formed by atomic nuclei
Correct Answer:
The highest energy band normally occupied by electrons
Explanation:
The valence band is the highest energy band that is normally occupied by electrons in a solid.
2. In an insulator, the valence band is generally:
A.
Completely empty
B.
Partially filled
C.
Completely filled
D.
Occupied only by holes
Correct Answer:
Completely filled
Explanation:
In an insulator, the valence band is completely filled with electrons under normal conditions.
3. The electrons present in the valence band are mainly responsible for:
A.
Chemical bonding in the solid
B.
Nuclear reactions
C.
Producing magnetic fields only
D.
Changing the mass of atoms
Correct Answer:
Chemical bonding in the solid
Explanation:
Valence-band electrons participate in bonding between atoms and help hold the solid together.
4. Which particles occupy the valence band of an insulator at low temperature?
A.
Electrons
B.
Protons
C.
Neutrons
D.
Ions only
Correct Answer:
Electrons
Explanation:
The valence band is an allowed energy band occupied by electrons, including in an insulator at low temperature.
5. The valence band is formed due to the splitting of:
A.
Atomic energy levels in a solid
B.
Nuclear energy levels only
C.
The masses of electrons
D.
The charges of protons
Correct Answer:
Atomic energy levels in a solid
Explanation:
When many atoms come together to form a solid, their closely spaced atomic energy levels split and form energy bands such as the valence band.
6. In an insulator, electrons in the valence band are usually:
A.
Tightly bound to atoms
B.
Completely absent
C.
Free to move throughout the solid
D.
Located inside the nucleus
Correct Answer:
Tightly bound to atoms
Explanation:
Valence-band electrons in an insulator are strongly bound and cannot move freely through the material under ordinary conditions.
7. What is the usual electron occupancy of the valence band in an insulator at absolute zero?
A.
Fully occupied
B.
Half occupied
C.
Nearly empty
D.
Occupied by protons
Correct Answer:
Fully occupied
Explanation:
At absolute zero, the valence band of an insulator is filled completely with electrons.
8. Which statement about the valence band of an insulator is correct?
A.
It contains bound electrons
B.
It contains only neutrons
C.
It is always empty
D.
It consists of free protons
Correct Answer:
It contains bound electrons
Explanation:
The valence band of an insulator contains electrons that are bound within the material and are not freely available for conduction.
9. The energy of electrons in the valence band is generally:
A.
Lower than that of electrons in higher allowed bands
B.
Zero for every electron
C.
Equal to the nuclear energy
D.
Independent of the material
Correct Answer:
Lower than that of electrons in higher allowed bands
Explanation:
The valence band is a lower energy band occupied by electrons, while higher allowed bands have greater electron energies.
10. Why do valence-band electrons in an insulator not normally move freely?
A.
They are strongly bound within the solid
B.
They have no electric charge
C.
They are heavier than protons
D.
They are present only in the nucleus
Correct Answer:
They are strongly bound within the solid
Explanation:
Valence-band electrons in an insulator are strongly bound, so they do not move freely through the material under normal conditions.
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