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Standard XII
Physics
Question

Consider the following statements A and B and identify the correct answer.
Statement(A):A Zener diode is always connected in reverse bias to use it as voltage.
Statement(B):The potential barrier of a p-n junction lies between 0.1 to 0.3 V, approximately.
  1. A and B are correct.
  2. A and B are wrong.
  3. A is correct but B is wrong.
  4. A is wrong but B is correct.

A
A is correct but B is wrong.
B
A is wrong but B is correct.
C
A and B are correct.
D
A and B are wrong.
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Solution
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When Zener diode is forward biased, it behaves like ordinary diode and when reverse biased, it will be a voltage stabilizer. Also, at room temperature, the voltage across the depletion layer for silicon is about 0.6−0.7V and for germanium is about 0.3−0.35V
Hence, statement A is correct but statement B is wrong.

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Similar Questions
Q1
Consider the following statements A and B and identify the correct answer.
Statement(A):A Zener diode is always connected in reverse bias to use it as voltage.
Statement(B):The potential barrier of a p-n junction lies between 0.1 to 0.3 V, approximately.
View Solution
Q2
Consider following two statements

(A) In forward biased condition, width of depletion region in p-n junction diode decreases.

(B) Barrier potential of a p-n junction depends on amount of doping.

The correct statement(s) is/are
View Solution
Q3
Consider the following two statements:
(A) Kirchhoff's junction law follows from conservation of charge.
(B) Kirchhoff's loop law follows from conservative nature of electric field.

(a) A and B are correct.
(b) A is correct but B is wrong.
(c) B is correct but A is wrong.
(d) A and B are wrong.
View Solution
Q4

How is a Zener diode fabricated? What causes the setting up of high electric field even for small reverse bias voltage across the diode?

Describe, with the help of a circuit diagram, the working of Zener diode as a voltage regulator

OR

(a) Explain with the help of a diagram, how depletion region and potential barrier are formed in a junction diode.

(b) If a small voltage is applied to a p-n junction diode, how will the barrier potential be affected when it is (i) forward biased, and (ii) reveres biased?

View Solution
Q5
Consider the following statements regarding a thermocouple.
(A) The neutral temperature does not depend on the temperature of the cold junction.
(B) The inversion temperature does not depend on the temperature of the cold junction.
(a) A and B are correct.
(b) A is correct but B is wrong.
(c) B is correct but A is wrong.
(d) A and B are wrong.
View Solution