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Semiconductor Electronics · Question 26

JEE Main 2025 (Online) 4th April Evening ShiftMCQEasy📈 Topic in 3% papers+4−1
1

Consider an n-type semiconductor in which ne and nh are number of electrons and holes, respectively. Choose the correct answer from the options given below :

  1. (A), (B), (E) only
  2. (A), (C), (E) only
  3. (A), (B), (C) only
  4. (A), (C), (D) only

Answer

(1) (A), (B), (E) only

Solution

(A) In an n-type semiconductor electrons are the majority carriers and holes are the minority carriers. Correct.

(B) n-type doping is done with a pentavalent (group 15) atom such as P, As or Sb. Correct.

(C) and (D) As per NCERT, in thermal equilibrium ne nh = ni2 for any (intrinsic or extrinsic) semiconductor. So ne nh ni2 is wrong, and ne nh is never greater than ni2. Both incorrect.

(E) A donor atom gives only a free electron (and becomes a fixed positive ion); the few holes come from thermal generation of electron–hole pairs, not from the donors. Correct.

(A), (B), (E) only

Answer: (1)

JEE Main 2025 (Online) 4th April Evening Shift

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2

Choose the correct logic circuit for the given truth table having inputs A and B. [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2025 (Online) 3rd April Morning Shift
3

The truth table corresponding to the circuit given below is: [figure]

  1. arrayccc A & B & C \ 0 & 0 & 0 \ 0 & 1 & 0 \ 1 & 0 & 1 \ 1 & 1 & 1 array
  2. arrayccc A & B & C \ 0 & 0 & 1 \ 1 & 0 & 0 \ 0 & 1 & 0 \ 1 & 1 & 0 array
  3. arrayccc A & B & C \ 0 & 0 & 1 \ 0 & 1 & 0 \ 1 & 0 & 0 \ 1 & 1 & 0 array
  4. arrayccc A & B & C \ 0 & 0 & 0 \ 1 & 0 & 0 \ 0 & 1 & 0 \ 1 & 1 & 1 array
JEE Main 2025 (Online) 3rd April Evening Shift
4

A zener diode with 5 V zener voltage is used to regulate an unregulated dc voltage input of 25 V. For a 400 resistor connected in series, the zener current is found to be 4 times load current. The load current (IL) and load resistance (RL) are :

  1. IL = 0.02 mA; RL = 250
  2. IL = 10 A; RL = 0.5
  3. IL = 10 mA; RL = 500
  4. IL = 20 mA; RL = 250
JEE Main 2025 (Online) 2nd April Morning Shift
5

In the digital circuit shown in the figure, for the given inputs the P and Q values are : [figure]

  1. P = 0, Q = 1
  2. P = 1, Q = 0
  3. P = 0, Q = 0
  4. P = 1, Q = 1
JEE Main 2025 (Online) 2nd April Evening Shift
6

[figure] For the circuit shown above, equivalent GATE is :

  1. NOT gate
  2. NAND gate
  3. AND gate
  4. OR gate
JEE Main 2025 (Online) 29th January Morning Shift
7

Which of the following circuits has the same output as that of the given circuit? [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2025 (Online) 28th January Morning Shift
8

[figure] In the circuit shown here, assuming threshold voltage of diode is negligibly small, then voltage VAB is correctly represented by:

  1. [figure]
  2. [figure]
  3. VAB would be zero at all times.
  4. [figure]
JEE Main 2025 (Online) 28th January Evening Shift

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