PYQSide ExamsMy practice

Semiconductor Electronics · Question 83

AIPMT 2007MCQEasy📈 Topic in 0% papers+4−1
1

In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is [figure]

  1. an insulator
  2. a metal
  3. an n-type semiconductor
  4. a p-type semiconductor

Answer

(4) a p-type semiconductor

Solution

From the figure: conduction band has 2 electrons; valence band has 6 holes.

nh > ne, holes are the majority carriers.

As per NCERT, a semiconductor with nh ne is a p-type semiconductor (the acceptor level lies just above the valence band).

The material is a p-type semiconductor.

Answer: (4)

AIPMT 2007

Keep practising — Semiconductor Electronics

2

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
AIPMT 2006
3

Which one of the following represents forward bias diode ?

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

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
5

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
6

Zener diode is used for

  1. amplification
  2. rectification
  3. stabilisation
  4. producing oscillations in an oscillator.
AIPMT 2005
7

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
8

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
9

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
10

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
11

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

All Semiconductor Electronics PYQs →

PDFDownload Semiconductor Electronics PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All NEET Physics chapters
Class 11Units and MeasurementsMotion in a Straight LineMotion in a PlaneLaws of MotionWork, Energy and PowerSystem of Particles and Rotational MotionGravitationMechanical Properties of SolidsMechanical Properties of FluidsThermal Properties of MatterThermodynamics (Physics)Kinetic TheoryOscillationsWaves
Class 12Electric Charges and FieldsElectrostatic Potential and CapacitanceCurrent ElectricityMoving Charges and MagnetismMagnetism and MatterElectromagnetic InductionAlternating CurrentElectromagnetic WavesRay Optics and Optical InstrumentsWave OpticsDual Nature of Radiation and MatterAtomsNucleiSemiconductor ElectronicsExperimental Skills (Physics)