SEMICONDUCTOR
DIODES & APPLICATIONS
OBJECTIVE
TYPE QUESTIONS BASED ON DIPLOMA LEVEL SYLLABUS FOR THE
DRDO,DMRC,SSC,BHEL,RAILWAYS & OTHER ENGINEERING(DIPLOMA LEVEL) COMPETITIVE EXAMS
1.
Flow of electrons is generally termed as _____________.
(a) Electric current (b)
electric shock
(c) Semiconductor (d) none of the
above
2.
A _______________ is a material which offers very little
resistance to the flow of
current through it.
a) Good conductor b) insulator
3.
The resistance offered by ______________ is extremely
large for the flow of current
through it.
a) Good conductor b) insulator
c) Semiconductor d) none of the above
4.
The materials which behave like perfect insulators at
low temperatures & at higher temperatures, they behave like good conductors
are termed as ________.
a)
Good conductor b)
insulator
c) Semiconductor d) none of
the above
5.
The conductivity of a semiconductor _____________ with
temperature.
a) Increases
b) decreases
c) Can’t say d)
none of the above
6.
The conductivity of a good conductor _____________ with
temperature.
a) Increases b) decreases
c) Can’t say d) none of the
above
7.
The resistance of a semiconductor _____________ with
temperature.
a) Increases b) decreases
c) Can’t say d) none of the above
8.
The resistance of a good conductor _____________ with
temperature.
a) Increases
b) decreases
c) Can’t say d)
none of the above
9.
The charge of an electron is ___________________.
a) 1.602×10+27Coulomb b) 1.602×10-27Coulomb
c) 1.602×10+19Coulomb d) 1.602×10-19Coulomb
10. The total
number of electrons in an atom depends upon ____________.
a)
The atomic mass
b) the atomic weight
c) The atomic number d) the atomic size
11. In any atom, the number of electrons
in the last orbit (i.e., the outermost
orbit or the valence orbit)
is limited to ________________.
a) 4 b) 8
c) 10 d)
12
12. In any atom,
the outermost orbit is called ______________.
a) Valence orbit
b) energy band
c)
Conduction band d)
forbidden band
13. The electrons
present in the valence orbit are termed as _______________.
a)
Valence electrons
b) free electrons
c) Can’t say
d) none of the above
14.
The range of energies possessed by the electrons of any
one orbit of all atoms is
referred as _____________________.
a) Valence band b) energy band
c)
Conduction band d)
forbidden band
15. The energy
band in relation to valence electrons is termed as ___________.
a) Valence band
b) energy band
c)
Conduction band d)
forbidden band
16. Electrons
which are removed from the valence orbits of atoms, which are freely available
for conduction, are termed as __________________.
a)
Valence electrons
b) free
electrons
c) Can’t say
d) none of the above
17. The range of
energies possessed by the free electrons is termed as ______.
a) Valence band b)
energy band
c) Conduction band d) forbidden band
18. The void (or
gap) separating conduction band and valence band, and noelectron can exist in
this void is termed as ______________.
a) Valence band b)
energy band
c) Conduction band d) forbidden band
19. In a metal,
the number of valence electrons is ___________.
a) Less than 4
b) equal to 4
c) Greater than 4 d)
equal to 8
20. In a
semiconductor material, the number of valence electrons is ___________.
a) Less than 4
b) equal to 4
c) Greater than 4 d) equal to 8
21. In an
insulator, the number of valence electrons is ___________.
a) Less than 4 b)
equal to 4
c) Greater than 4 d) equal to 8
22. The current which results in a semiconductor
material due to the movement
of holes
is termed as ___________________.
a) hole current
b) electron current
c) negative current d)
none of the above
23. A semiconductor
in its pure form is termed as __________________.
a) intrinsic semiconductor b) extrinsic semiconductor
c)
p-type semiconductor d)
n-type semiconductor
24. The
process of adding impurity to a pure semiconductor material, in order to
increase its
conductivity
is called as __________________.
a) dancing
b) doping
c) creating holes d)
creating electrons
25. A
semiconductor to which an impurity is added with view to increase its
conductivity is
termed
as __________________.
a) intrinsic
semiconductor b) extrinsic semiconductor
c)
p-type semiconductor d)
n-type semiconductor
26. If a
pentavalent impurity like arsenic or antimony or phosphorus is added to pure
germanium
or silicon, a _____________________ results.
a)
intrinsic semiconductor b)
extrinsic semiconductor
c)
p-type semiconductor d) n-type semiconductor
27. In a n-type
semiconductor material electrons are ________________.
a) majority charge carriers b)
minority charge carriers
c)
donor atoms d)
acceptor atoms
28. In a
n-type semiconductor material holes are ________________.
a)
majority charge carriers b) minority charge carriers
c) donor atoms d)
acceptor atoms
29. The
pentavalent impurity atom, like arsenic, added to pure germanium material is
termed as ____________.
a)
majority charge carriers b)
minority charge carriers
c) donor atoms
d) acceptor atoms
30. If a
trivalent impurity like gallium or indium or aluminum is added to pure
germanium
or
silicon, a _____________________ results.
a)
intrinsic semiconductor b)
extrinsic semiconductor
c) p-type semiconductor d) n-type semiconductor
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