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Semiconductor Electronics · Question 84

AIPMT 2006MCQEasy📈 Topic in 75% papers+4−1
1

The following figure shows a logic gate circuit with two inputs A and B and the output C. [figure] The voltage waveforms of A, B and C are as shown below. [figure] The logic circuit gate is

  1. OR gate
  2. AND gate
  3. NAND gate
  4. NOR gate

Answer

(2) AND gate

Solution

Reading the waveforms interval by interval:

A = 1, B = 1 ⇒ C = 1

A = 0, B = 1 ⇒ C = 0

A = 1, B = 0 ⇒ C = 0

A = 0, B = 0 ⇒ C = 0

∴ C = 1 only when both A and B are 1, i.e. C = A · B, which is an AND gate.

Answer: (2)

AIPMT 2006

Keep practising — Semiconductor Electronics

2

Which one of the following represents forward bias diode ?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2006
3

A transistor is operated in common emitter configuration at constant collector voltage VC = 1.5 V such that a change in the base current from 100 to 150 produces a change in the collector current from 5 mA to 10 mA. The current gain is

  1. 50
  2. 67
  3. 75
  4. 100
Out of syllabusAIPMT 2006
4

Choose the only false statement from the following.

  1. In conductors the valence and conduction bands overlap.
  2. Substances with energy gap of the order of 10 eV are insulators.
  3. The resistivity of a semiconductor increases with increase in temperature.
  4. The conductivity of a semiconductor increases with increase in temperature.
AIPMT 2005
5

Zener diode is used for

  1. amplification
  2. rectification
  3. stabilisation
  4. producing oscillations in an oscillator.
AIPMT 2005
6

Application of a forward bias to a p-n junction

  1. widens the depletion zone
  2. increases the potential difference across the depletion zone
  3. increases the number of donors on the n side
  4. decreases the electric field in the depletion zone.
AIPMT 2005
7

Carbon, silicon and germanium atoms have four valence electrons each. Their valence and conduction bands are separated by energy band gaps represented by (Eg)C, (Eg)Si and (Eg)Ge respectively. Which one of the following relationships is true in their case?

  1. (Eg)C > (Eg)Si
  2. (Eg)C < (Eg)Si
  3. (Eg)C = (Eg)Si
  4. (Eg)C < (Eg)Ge.
AIPMT 2005
8

In a p-n junction photo cell, the value of the photo-electromotive force produced by monochromatic light is proportional to

  1. The barrier voltage at the p-n junction.
  2. The intensity of the light falling on the cell.
  3. The frequency of the light falling on the cell.
  4. The voltage applied at the p-n junction.
AIPMT 2005
9

In semiconductors at room temperature

  1. the valence band is partially empty and the conduction band is partially filled
  2. the valence band is completely filled and the conduction band is partially filled
  3. the valence band is completely filled
  4. the conduction band is completely empty
AIPMT 2004
10

The peak voltage in the output of a half wave diode rectifier fed with a sinusoidal signal without filter is 10 V. The d.c. component of the output voltage is

  1. (10/ 2) V
  2. ( 10 ) V
  3. 10 V
  4. (20/ ) V
AIPMT 2004
11

The output of OR gate is 1

  1. if both inputs are zero
  2. if either or both inputs are 1
  3. only if both inputs are 1
  4. if either input is zero
AIPMT 2004

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