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Published on: 29/08/2019
Electronic Devices
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Questions + Answers key
Take MCQ Physics Test
1.
Is the number of electrons greater than, less than (or) equal to the number of holes in an intrinsic semi conductor?
2.
Why does the conductivity of a semi conductor change with the rise in temperature ?
3.
What is the order of energy gap in a conductor, semi conductor, and insulator?
4.
Name the types in which the electronic circuits have been classified.
5.
What is doping?
6.
Where does the fermi-level of intrinsic semiconductor lie?
7.
What is fermi level and fermi energy?
8.
According to energy band diagram, what makes a substance
(a) conductor
(b) insulator?
9.
In an n-type semiconductor, the Fermi level lies 0.3 e V below the conduction band at 300 k. If the temperature is increased to 330 k, where does the new position of the Fermi level lie?
0.55 e V below the conduction band
0.44 eV below the conduction band
0.33 eV below the conduction band
0.27 eV below the conduction band
10.
In intrinsic semiconductor at room temperature, the number of electrons and holes are
equal
zero
unequal
infinite
11.
In good conductorsof electricity the type of bonding that exists is
ionic
vander waals
covalent
metallic
12.
The conduction band in a solid is partially filled at 0 k. The solid sample is
Conductor
Semiconductor
Insulator
none of these
1.
In an intrinsic semi conductor the number of free electrons and holes is same.
2.
When a semi conductor is heated more & more electrons get enough energy to jump across the forbidden energy gap from valence band to the conduction band, where they are free to conduct electricity. Thereby increasing the conductivity of a semi conductor.
3.
Conductor - no energy gap
Semi Conductor - It is of the order of 1 ev
Insulator - 6 ev (or) more than 6 ev
4.
(a) Analogue circuits and
(b) Digital circuits.
5.
Doping is a process of deliberate addition of a desirable impurity in a pure semiconductor to modify its properties in a controlled manner.
6.
The fermi-level of intrinsic semiconductor lies mid way between its valence and conduction bands i.e., in the middle of forbidden energy gap of intrinsic semi-conductor.
7.
In an energy band, the highest energy level occupied by electron at 0K is called fermi level and its energy is called fermi -energy.
8.
(a) Overlapping of conduction band and valence band
(b) A large energy gap (more than 3 eV) Between conduction band and valence band.
9.
(d)
0.27 eV below the conduction band
10.
equal
11.
(d)
metallic
12.
Conductor
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