Semiconductor Electronics Materials Devices And Simple Circuits

Physics
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Which of the following contains a covalent bond?

A
B
C
D
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The bond, that exists in a semiconductor is

A
covalent bond
B
ionic bond
C
metalic bond
D
hydrogen bond
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A hole is

A
a positively charged electron.
B
an electron in the valence band.
C
an unfilled covalent bond.
D
an excess electron in covalent bond.
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The mobility of free electrons is greater than that of free holes because 

A
they carry negative charge
B
they are light
C
their mutual collisions are less
D
they require low energy to continue their motion
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The value indicated by Fermi energy level in an intrinsic semiconductor is

A
the average energy of electrons and holes.
B
the energy of electrons in conduction band.
C
the energy of holes in valence band.
D
the energy of forbidden region.
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In an intrinsic semiconductor, the Fermi energy level is

A
nearer to valence band than conduction band.
B
equidistant from conduction band and valence band.
C
nearer to conduction band than valence band.
D
bisecting the conduction band.
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There is no hole current in conductors, because they have

A
high conductivity
B
high electron density
C
no valence band
D
overlapping of valence and conduction bands
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Forbidden gap in a pure conductor is

A
B
C
D
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Which of the following are correct for insulators?

A
The valence band is partially filled with electrons.
B
The conduction band is partially filled with electrons.
C
The conduction band is partially filled with electrons and valence band is empty.
D
The conduction band is empty and the valence band is filled with electrons.
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