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Free download in PDF PN Junction Diode Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
The capacitance of a reverse biased PN junction
[A]
Increases as reverse bias is decreased
[B]
Decreases as reverse bias is increased
[C]
Increases as reverse bias is increased
[D]
Is insignificantly low
Answer: Increases as reverse bias is decreased
(2)
For a PN junction diode, the current in reverse bias may be
[A]
Few amperes
[B]
Few micro or nano amperes
[C]
Few miliamperes
[D]
Between 0.2 A and 15 A
Answer: Few micro or nano amperes
(3)
A PN junction is formed in a process which may be of
[A]
The grown type
[B]
Diffused type
[C]
Alloyed type
[D]
Any of the above
(4)
The depletion layer of a PN junction diode has
[A]
Only free mobile holes
[B]
Only free mobile electrons
[C]
Both free mobile holes as well as electrons
[D]
Neither free mobile electrons nor holes
Answer: Neither free mobile electrons nor holes
(5)
The potential barrier existing across a PN junction corresponds to
[A]
Forward bias of the junction
[B]
Height of the barrier
[C]
Width of the barrier
[D]
Reverse bias of the junction
Answer: Height of the barrier
(6)
The p-region has a greater concentration of __________ as compared to the n-region in a P-N junction.
[A]
holes
[B]
phonons
[C]
electrons
[D]
both holes & electrons
(7)
In the p & n regions of the p-n junction the _________ & the ___________ are the majority charge carriers respectively.
[A]
holes, electrons
[B]
electrons, holes
[C]
holes, holes
[D]
electrons, electrons
(8)
The n-region has a greater concentration of _________ as compared to the p-region in a P-N junction diode.
[A]
electrons
[B]
phonons
[C]
holes
[D]
oth holes & electrons
(9)
Which of the below mentioned statements is false regarding a p-n junction diode?
[A]
Diodes have three terminals
[B]
Diodes are unidirectional devices
[C]
Diode are uncontrolled devices
[D]
Diodes are rectifying devices
Answer: Diodes have three terminals
(10)
Color of light emitted by LED depends on
[A]
semiconductor material
[B]
forward current
[C]
its forward bias
[D]
its reverse bias
Answer: semiconductor material
(11)
When semiconductor is doped half with trivalent and half with pentavalent impurities, junction formed is known as
[A]
potential barrier
[B]
barrier junction
[C]
PN junction
[D]
None of the above
(12)
Photo diode is used for detection of
[A]
visible light
[B]
invisible light
[C]
no light
[D]
both a and b
(13)
One that is based on forward biased PN junction is
[A]
LED
[B]
photo diode
[C]
photo voltaic cell
[D]
both a and b
(14)
Which of the following is true in case of a forward biased p-n junction diode?
[A]
The positive terminal of the battery sucks electrons from the p-region
[B]
The negative terminal of the battery sucks electrons from the p-region
[C]
The positive terminal of the battery injects electrons into the p-region
[D]
None of the above mentioned statements are true
Answer: The positive terminal of the battery sucks electrons from the p-region
(15)
Which of the following is true in case of an unbiased p-n junction diode?
[A]
There is zero electrical potential across the junctions
[B]
Charges establish an electric field across the junctions
[C]
Diffusion does not take place
[D]
Diffusion of electrons & holes goes on infinitely
Answer: Charges establish an electric field across the junctions
(16)
When a physical contact between a p-region & n-region is established which of the following is most likely to take place?
[A]
Electrons from N-region diffuse to P-region
[B]
Holes from P-region diffuse to N-region
[C]
Both of the above mentioned statements are true
[D]
Nothing will happen
Answer: Both of the above mentioned statements are true
(17)
Lets assume that the doping density in the p-region is 10-9 cm-3 & in the n-region is 10-17cm-3, as such the p-n junction so formed would be termed as a
[A]
p+ n–
[B]
p+ n+
[C]
p– n–
[D]
p– n+
(18)
In the p & n regions of the p-n junction the _________ & the ___________ are the minority charge carriers respectively.
[A]
electrons, holes
[B]
holes, electrons
[C]
holes, holes
[D]
electrons, electrons
(19)
A p-type semiconductor material is doped with ____________ impurities whereas a n-type semiconductor material is doped with __________ impurities
[A]
acceptor, donor
[B]
donor, acceptor
[C]
acceptor, acceptor
[D]
donor, donor
(20)
Mobile electrons of P-side of the PN junction diode constitute
[A]
Depending upon voltage they may be either majority or minority current carriers
[B]
Majority current carriers
[C]
Minority current carriers
[D]
None of the above
Answer: Minority current carriers
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