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Semiconductor Electronics · Question 100

AIPMT 2002MCQEasy📈 Topic in 25% papers+4−1
1

In a p-n junction

  1. high potential at n side and low potential at p side
  2. high potential at p side and low potential at n side
  3. p and n both are at same potential
  4. undetermined.

Answer

(1) high potential at n side and low potential at p side

Solution

As per NCERT, when a p-n junction is formed, holes diffuse from p to n and electrons from n to p, leaving uncovered negative acceptor ions on the p side and positive donor ions on the n side of the depletion layer.

This space charge sets up an electric field from the n side to the p side and a barrier potential across the junction.

Since the field points from n to p, the n side is at the higher potential and the p side at the lower potential.

High potential at n side and low potential at p side.

Answer: (1)

AIPMT 2002

Keep practising — Semiconductor Electronics

2

The given truth table is for which logic gate? [figure]

  1. NAND
  2. XOR
  3. NOR
  4. OR.
AIPMT 2002
3

For the given circuit of p-n junction diode, which is correct? [figure]

  1. in forward bias the voltage across R is V
  2. in reverse bias the voltage across R is V
  3. in forward bias the voltage across R is 2V
  4. in reverse bias the voltage across R is 2V.
AIPMT 2002
4

For a transistor ICIE = 0.96, then current gain for common emitter is

  1. 12
  2. 6
  3. 48
  4. 24
Out of syllabusAIPMT 2002
5

The given truth table is for which logic gate [figure]

  1. NAND
  2. XOR
  3. NOR
  4. OR
AIPMT 2001
6

The current in the circuit will be [figure]

  1. 540 A
  2. 550 A
  3. 510 A
  4. 520 A
AIPMT 2001
7

For a common base circuit if ICIE = 0.98 then current gain for common emitter circuit will be

  1. 49
  2. 98
  3. 4.9
  4. 25.5
Out of syllabusAIPMT 2001
8

From the following diode circuits, which diode is in forward biased condition?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2000
9

The correct relation between and for a transistor is

  1. = 1-
  2. = 1-
  3. = -1
  4. = 1
Out of syllabusAIPMT 2000

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