WorksheetsBASIC ELECTRONICS
Total questions: 25
Worksheet time: 4mins
A semiconductor has generally ……………… valence electrons.
2
3
6
4
The forbiddenn energy gap for Germanium is of the order of
(a) 0.7 eV
(b) 0.3 eV
(c) 1.1 eV
(d) 10 eV
Which of the following is a pentavalent impuity added while forming an extrinsic semiconductor ?
Boron
Arsenic
Indium
Gallium
Doping of Semiconductors
materials which can conduct electricity better than insulator, but not as well as conductors.
The process of adding of a certain amount of specific impurities atoms in the pure semiconductor.
when 4 electrons in outermost orbit.
The process of adding an impurity to an intrinsic semiconductor is called
Doping
Ionization
Recombination
Atomic modification
The minority carriers in P-type silicon are called _________________
Neutron
Proton
Electron
Hole
Which is not one of the properties of semiconductor?
4 electrons in outermost orbit, in covalent bonding.
atoms vibrate causes electron to break free from the bonds.
Electron free leaves hole.
Semiconductor has 2 types of charge carriers.
all of the above are the properties of it
The forbidden energy gap for Silicon is of the order of
0.7 eV
0.3 eV
1.1 eV
10 eV
Who contribute to the current in a semiconductor
electrons only
holes only
negative ions
both electrons and holes
When a pentavalent impurity is added to a pure semiconductor, it becomes ………
An insulator
An intrinsic semiconductor
p-type semiconductor
n-type semiconductor
Addition of trivalent impurity to a semiconductor creates many ……..
Holes
Free electrons
Valence electrons
Bound electrons
At room temperature, an intrinsic semiconductor has ……….
Many holes only
A few free electrons and holes
Many free electrons only
No holes or free electrons
The battery connections required to reverse bias a pn junction are ……
+ve terminal to p and –ve terminal to n
-ve terminal to p and +ve terminal to n
-ve terminal to p and –ve terminal to n
+ve terminal to p and +ve terminal to n
Materials which can conduct electricity better than insulator,but not as well as conductors. This is the definition of
diode
semiconductor
conductor
insulator
superconductor
when Silicon is doped with ________ and n-type semi conductors is formed
B
P
Al
Si
These are the characteristics of Trivalent impurities except
•3 valence electrons
•produce p-type semiconductors
•producing a "hole".
Antimony, arsenic, and phosphorus are the examples
What is the most common semiconductor material used for producing integrated circuits
Quartz
Silicon
Diamond
Tantalum
How is conduction increased in an p-type semiconductor?
by increased applied electrical field
by decreased applied electrical field
by the availability of extra holes
by the availability of donor electrons
____________ are the charge carriers in N- type semiconductors.
electrons
protons
holes
neutrons
For intrinsic semiconductor, the number of electrons in the conduction band __________ the number of holes in the valence band.
is equal to
will be less than
will be greater than
will be less than or equal to
A semi conductor in an extremely pure form is known as an
Extrinsic semiconductor
P-Type semiconductor
N-Type semiconductor
Intrinsic semiconductor
When a pentavalent impurity is added to a pure semiconductor, it becomes ………
An insulator
An intrinsic semiconductor
p-type semiconductor
n-type semiconductor
Addition of trivalent impurity to a semiconductor creates many ……..
Holes
Free electrons
Valence electrons
Bound electrons
The number of electrons in the outermost orbit of silicon
4
14
3
8
Which of the following is a pentavalent impuity added while forming an extrinsic semiconductor ?
Boron
Arsenic
Indium
Gallium
