Conduction Band MCQs
We know that the electrons in an atom are present in different energy level. For stability of structure the electrons has to split in different levels, these levels are termed as Energy Bands. There are two types of energy bands
1) Conduction band 2) Valance band
Valence Band: Energy levels of valence electrons are known as the valence band. It is completely/highest filled energy band. Electron in this level possesses lowest energy.
Conduction Band: Almost empty energy level is known as conduction band. But electron from valance band can jump in to this band so as to possess higher energies. Electrons present in this band can contribute for flow of current. It has conducting electrons resulting in the flow of current. The conduction band possesses high energy level and is generally empty.
The gap between adjacent bands representing a range of energies that possess no electron is called a Forbidden gap.
Q.1) The conduction band in insulators is……
a) Completely filled
b) Completely empty
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c) Partially filled.
d) None of these.
Q.2) The forbidden energy gap in insulators is about…..
a) greater than 3.0 eV.
b) less than 3.0 eV.
b) greater than 1 eV
d) less than 1 eV
Q.3) The electrons present in conduction band are……..
a) having higher energies
b) available for conduction
c) in excited state
d) all of these
Q.4) Conduction band and valance band are almost overlapped in….
a) conductors
b) insulators
c) semiconductors
d) all of these
Q.5) The conduction band is partially filled in…..
a) conductors
b) insulators
c) semiconductors
d) all of these
Q.6) The conduction band is completely empty in……..
a) conductors
b) insulators
c) semiconductors
d) all of these
Q.7) The conduction band and valence band in semiconductors are separated by energy gap of….
a) zero
b) less than 2 eV
c) greater than 2 eV
d) 3 eV
Answers:
Q.1) b) Completely empty
Q.2) a) greater than 3.0 eV.
Q.3) d) all of these
Q.4) a) conductors
Q.5) c) semiconductors
Q.6) b) insulators
Q.7) b) less than 2 eV