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Semiconductor Electronics

AIPMT 2003MCQEasy📈 Topic in 25% papers+4−1
Ques. 1AIPMT 2003

Reverse bias applied to a junction diode

  1. lowers the potential barrier
  2. raises the potential barrier
  3. increases the majority carrier current
  4. increases the minority carrier current

Answer

(2) raises the potential barrier

Solution

As per NCERT, under reverse bias the applied voltage V is in the same direction as the barrier potential.

⇒ Effective barrier height = V0 + V, i.e. the potential barrier is raised and the depletion layer widens.

The majority carrier (diffusion) current falls sharply; the small minority carrier (drift) current is nearly independent of the applied voltage (reverse saturation current).

∴ Reverse bias raises the potential barrier.

Answer: (2)

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Ques. 2AIPMT 2003

If a full wave rectifier circuit is operating from 50 Hz mains, the fundamental frequency in the ripple will be

  1. 25 Hz
  2. 50 Hz
  3. 70.7 Hz
  4. 100 Hz
Ques. 3AIPMT 2003

Barrier potential of a p-n junction diode does not depend on

  1. diode design
  2. temperature
  3. forward bias
  4. doping density
Ques. 4AIPMT 2003

An n-p-n transistor conducts when

  1. both collector and emitter are positive with respect to the base
  2. collector is positive and emitter is negative with respect to the base
  3. collector is positive and emitter is at same potential as the base
  4. both collector and emitter are negative with respect to the base
Out of syllabus
Ques. 5AIPMT 2002

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.
Ques. 6AIPMT 2002

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

  1. NAND
  2. XOR
  3. NOR
  4. OR.
Ques. 7AIPMT 2002

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.
Ques. 8AIPMT 2002

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

  1. 12
  2. 6
  3. 48
  4. 24
Out of syllabus
Ques. 9AIPMT 2001

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

  1. NAND
  2. XOR
  3. NOR
  4. OR
Ques. 10AIPMT 2001

The current in the circuit will be [figure]

  1. 540 A
  2. 550 A
  3. 510 A
  4. 520 A
Ques. 11AIPMT 2001

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 syllabus

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