PYQSide ExamsMy practice

Semiconductor Electronics · Question 25

NEET (UG) 2021MCQMedium📈 Topic in 75% papers+4−1
1

For the given circuit, the input digital signals are applied at the terminals A, B and C. What would be the output at the terminal y? [figure]

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

Answer

(3) [figure]

Solution

The upper gate is AND (inputs A, B) and the lower gate is NAND (inputs B, C); both outputs go to an OR gate.

y = A B + B C

From the waveforms, B and C are never high (5 V) together:

Before t2 and after t4: B = 0

Between t2 and t4: C = 0

B C = 0 at all times B C = 1 at all times.

y = A B + 1 = 1 (5 V) throughout.

The output y is a constant 5 V.

Answer: (3)

NEET (UG) 2021

Keep practising — Semiconductor Electronics

2

The increase in the width of the depletion region in a p-n junction diode is due to :

  1. reverse bias only
  2. both forward bias and reverse bias
  3. increase in forward current
  4. forward bias only
NEET (UG) 2020
3

For the logic circuit shown, the truth table is : [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2020
4

For transistor action, which of the following statements is correct?

  1. Base, emitter and collector regions should have same size.
  2. Both emitter junction as well as the collector junction are forward biased.
  3. The base region must be very thin and lightly doped.
  4. Base, emitter and collector regions should have same doping concentrations.
Out of syllabusNEET (UG) 2020
5

The correct Boolean operation represented by the circuit diagram drawn is : [figure]

  1. OR
  2. NAND
  3. NOR
  4. AND
NEET (UG) 2019
6

For a p-type semiconductor, which of the following statements is true?

  1. Holes are the majority carriers and trivalent atoms are the dopants.
  2. Holes are the majority carriers and pentavalent atoms are the dopants.
  3. Electrons are the majority carriers and pentavalent atoms are the dopants.
  4. Electrons are the majority carriers and trivalent atoms are the dopants.
NEET (UG) 2019
7

In the combination of the following gates the output Y can be written in terms of inputs A and B as [figure]

  1. A.B
  2. A. B + A.B
  3. A. B + A.B
  4. A + B
NEET 2018
8

In a p-n junction diode, change in temperature due to heating

  1. affects only reverse resistance
  2. affects only forward resistance
  3. does not affect resistance of p-n junction
  4. affects the overall V - I characteristics of p-n junction
NEET 2018
9

In the circuit shown in the figure, the input voltage Vi is 20 V, VBE = 0 and VCE = 0. The values of IB, IC and β are given by [figure]

  1. IB = 40 , IC = 10 mA, β = 250
  2. IB = 25 , IC = 5 mA, β = 200
  3. IB = 20 , IC = 5 mA, β = 250
  4. IB = 40 , IC = 5 mA, β = 125
Out of syllabusNEET 2018
10

The given electrical network is equivalent to [figure]

  1. OR gate
  2. NOR gate
  3. NOT gate
  4. AND gate
NEET 2017
11

Which one of the following represents forward bias diode ?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET 2017

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)