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PN Junction Diode Quiz

PN Junction Diode Quiz

Q1: In forward bias, the width of potential barrier in a p-n junction diode?

a) increases
b) decreases
c) remains constant
d) first increases then decreases
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Ans: b) decreases

Q2: What is the cause of the potential barrier in a p-n diode?

a) Depletion of positive charges near the junction
b) Concentration of positive charges near the junction
c) Depletion of negative charges near the junction
d) Concentration of positive and negative charges near the junction
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Ans: d) Concentration of positive and negative charges near the junction

Q3: A depletion layer consists of?

a) electrons
b) protons
c) mobile ions
d) immobile ions
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Ans: d) immobile ions

Q4: The part of depletion layer in the p-type contains………..

a) holes
b) positive ions
c) free electrons
d) negative ions
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Ans: d) negative ions

Q5: In an unbiased p-n junction

a) The potential of the p and n sides becomes higher alternately
b) The p side is at higher electrical potential than the n side
c) The n side is at higher electrical potential than the p side
d) Both the p and n sides are at the same potential
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No answer provided

Q6: Reverse bias applied to a junction diode

a) increases the minority carrier current
b) lowers the potential barrier
c) raises the potential barrier
d) increases the majority carrier current
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c) raises the potential barrier

Q7: In a junction diode, the holes are due to

a) protons
b) extra electrons
c) neutrons
d) missing electrons
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d) missing electrons

Q8: The part of depletion layer in the n-type contains………..

a) holes
b) positive ions
c) free electrons
d) negative ions
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Ans: b) positive ions

Q9: Application of a forward bias to a p—n junction

a) widens the depletion zone.
b) increases the potential difference across the depletion zone.
c) increases the number of donors on the n side.
d) increases the electric field in the depletion zone.
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Ans: b) increases the potential difference across the depletion zone.

Q10: On increasing the reverse bias to a large value in p-n junction diode the current:

a) Increases slowly
b) remains fixed
c) Suddenly increases
d) decreases slowly
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Ans: c) Suddenly increases