Noise Pollution Quiz | PN Junction Diode Multiple Choice Questions and Answers

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Questions
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
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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

Answer: 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

Answer: holes
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

Answer: holes, 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

Answer: 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

Answer: PN junction
12 Photo diode is used for detection of
A visible light
B invisible light
C no light
D both a and b

Answer: 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

Answer: LED
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+

Answer: 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

Answer: electrons, holes
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

Answer: acceptor, 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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