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WorksheetsThe Band Theory
Total questions: 12
Worksheet time: 6mins
In an insulating material, _______.
the valence band is filled and the conduction
band is empty
the valence band is empty and the
conduction band is filled
both the valence band and conduction band
are empty
both the valence band and conduction band
are filled
both the valence band and conduction band
are partially filled
A material with 5 eV forbidden gap energy is:
conductor
An insulator
A semiconductor
An isolated molecule
An isolated atom
A material with a relatively large gap between its
valance band and conduction band would be
expected to be ______.
a good conductor
easily melted
a poor conductor
in the liquid state
crystalline material
According to the band theory of solids, why is lead
a good conductor?
There is a wide energy gap between the
valance band and conduction band of lead
The valance band of lead is empty and the
conduction band is filled
The valance band and the conduction
band of lead is half filled.
A great deal of energy is needed to move
valence electrons of lead to the conduction
band
The conduction band of lead overlaps the
valance band
What is the approximate energy gap between the
valance band and conduction band of insulators?
0 eV
1 eV
5 eV
10 eV
100 eV
Which of the following is not a semiconductor?
Silicon
Gallium
Germanium
Aluminum
Antimony
If a material contains overlapping conduction and
valence bands, both of which are partially
filled, then ____.
no potential difference is required to
induce a current in the material
the acceleration of electrons will require a
relatively large input of radiation
the conductance of the material will be
directly related to its temperature
a small electric field will make electrons
move from one atom to another
the acceleration of electrons will require
doping of the material
A material that conducts electricity well tends to
have ______.
no valance electrons
partially filled bands
completely filled bands
conduction and valance bands that are far
apart
a full valence band and an empty
conduction band
________ is an insulator.
Copper
Silicon
Gold
Table salt
Germanium
In a conductor, conductivity increases as ______.
temperature decreases
the applied electrical field decreases
resistance increases
more electrons move into the valence
band
Which of the following is not semiconductor
Sodium
Silicon
Aluminium
Nitrogen
Chlorine
The n-type semiconductors are doped with elements in group
13
15
