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WorksheetsBasics of Band Theory of Solids
Total questions: 10
Worksheet time: 5mins
In solids, energy bands are formed due to:
Scattering of electrons
Attraction of nuclei
Overlapping of atomic orbitals
Presence of free ions
The valence band is:
The band above the conduction band
The highest occupied energy band at 0 K
The band where free electrons exist
The band found only in metals
In conductors, the conduction band is:
Completely empty
Partially filled or overlaps with the valence band
Completely filled
Located far above the valence band
The energy gap (band gap) in insulators is:
Very small
Zero
Large (> 5 eV typically)
Negative
Which of the following materials has zero band gap?
Silicon
Germanium
Copper
Diamond
Semiconductors differ from insulators primarily in:
Number of electrons
Size of the energy gap
Type of atoms
Color
The conduction band in a solid is defined as:
Band containing tightly bound electrons
Band that is always empty
Band where electrons can move freely and conduct electricity
Band containing holes only
In intrinsic semiconductors at 0 K, the conduction band is:
Fully occupied
Partially occupied
Empty
Overlapping with valence band
In n-type semiconductors, the conduction is mainly due to:
Holes
Free electrons from donor atoms
Lattice vibrations
Valence electrons
What happens to a semiconductor's conductivity when temperature increases?
It decreases
It becomes zero
It increases
It becomes infinite
