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Semiconductor Electronics · Question 17

NEET (UG) 2022MCQMedium📈 Topic in 25% papers+4−1
1

[figure] In the given circuits (a), (b) and (c), the potential drop across the two p-n junctions are equal in

  1. Circuit (a) only
  2. Circuit (b) only
  3. Circuit (c) only
  4. Both circuits (a) and (c)

Answer

(4) Both circuits (a) and (c)

Solution

In each circuit the two p-n junctions are in series with the cell.

Circuit (a): both junctions are oriented the same way (P–N, P–N) both have the same bias equal potential drops.

Circuit (b): the junctions are oriented oppositely (P–N, N–P) one is forward biased and the other reverse biased. The reverse-biased junction has a very high resistance, so almost the whole potential drop occurs across it drops unequal.

Circuit (c): both junctions are oriented the same way (N–P, N–P) same bias equal potential drops.

The potential drops are equal in both circuits (a) and (c).

Answer: (4)

NEET (UG) 2022

Keep practising — Semiconductor Electronics

2

In half wave rectification, if the input frequency is 60 Hz, then the output frequency would be

  1. Zero
  2. 30 Hz
  3. 60 Hz
  4. 120 Hz
NEET (UG) 2022
3

[figure] The truth table for the given logic circuit is

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2022
4

[figure] Identify the equivalent logic gate represented by the given circuit

  1. NAND
  2. OR
  3. NOR
  4. AND
NEET (UG) 2022 (Phase 2)
5

The incorrect statement about the property of a Zener diode is :

  1. p and n regions of Zener diode are heavily doped
  2. Zener voltage remains constant at breakdown
  3. It is designed to operate under reverse bias
  4. Depletion region formed is very wide
NEET (UG) 2022 (Phase 2)
6

The collector current in a common base amplifier using n-p-n transistor is 24 mA. If 80% of the electrons released by the emitter is accepted by the collector, then the base current is numerically :

  1. 3 mA and entering the base
  2. 6 mA and leaving the base
  3. 3 mA and leaving the base
  4. 6 mA and entering the base
Out of syllabusNEET (UG) 2022 (Phase 2)
7

Consider the following statements (A) and (B) and identify the correct answer. (A) A Zener diode is connected in reverse bias, when used as a voltage regulator. (B) The potential barrier of p-n junction lies between 0.1 V to 0.3 V.

  1. (A) is incorrect but (B) is correct.
  2. (A) and (B) both are correct.
  3. (A) and (B) both are incorrect.
  4. (A) is correct and (B) is incorrect.
NEET (UG) 2021
8

The electron concentration in an n-type semiconductor is the same as hole concentration in a p-type semiconductor. An external field (electric) is applied across each of them. Compare the currents in them.

  1. No current will flow in p-type, current will only flow in n-type
  2. Current in n-type = current in p-type
  3. current in p-type > current in n-type
  4. current in n-type > current in p-type
NEET (UG) 2021
9

For the given circuit, the input digital signals are applied at the terminals A, B and C. What would be the output at the terminal y? [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2021
10

The increase in the width of the depletion region in a p-n junction diode is due to :

  1. reverse bias only
  2. both forward bias and reverse bias
  3. increase in forward current
  4. forward bias only
NEET (UG) 2020
11

For the logic circuit shown, the truth table is : [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2020

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