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Semiconductors Questions

Practice 62 Semiconductors questions with detailed answers and explanations. Free MCQs, PYQs, and mock test questions for NEET, JEE, GATE, SSC and more.

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62
Total Questions
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19
Easy
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41
Medium
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2
Hard
Practice by Exam:Physics(60)General Studies(1)Chemistry(1)

About Semiconductors — practice questions, PYQs & concepts

Semiconductors is a frequently-tested topic on Physics, General Studies, Chemistry. ExamTest.live currently lists 62 Semiconductors questions spanning previous-year papers from 2026 to 2026, each with worked solutions and a step-by-step explanation. Use the filters on this page to focus on a specific exam, difficulty level or year — every answer key is free, no sign-up required.

Semiconductors weight in competitive exams

Across our Semiconductors question bank, the largest sources are Physics (60), General Studies (1) and Chemistry (1). Click any exam chip above to drill down to that exam-specific question set.

How to use this page

  • Start easy: 19 easy Semiconductors questions are available — build fluency before moving up.
  • Target weak years: Use the year filter to focus on the most recent 2026 paper or older PYQs you have not attempted.
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All Semiconductors Questions(1–62 of 62)

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Q1easymcqPhysicsAIEEE 20042026
50% accuracy
A piece of copper and another of germanium are cooled from room temperature to . The resistance of:
Q2mediummcqPhysicsWBCS Prelims2026
0% accuracy
With increase in temperature the resistance of a pure semiconductor
Q3mediummcqPhysicsNEET 20192026
0% accuracy
The correct Boolean operation represented by the circuit diagram drawn is:
image
Q4easymcqPhysicsNEET 20192026
0% accuracy
For a p-type semiconductor, which of the following statements is true?
Q5mediummcqPhysicsAIEEE 20072026
0% accuracy
If in a p-n junction diode, a square input signal of is applied as shown
image, then the output signal across a load resistance (connected in series with the diode) will be:
image
Q6mediummcqPhysicsAIEEE 20072026
0% accuracy
Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statements is most appropriate?
Q7easymcqPhysicsNEET 20172026
Which one of the following represents forward bias diode?
image
Q8easymcqPhysicsNEET 20172026
The given electrical network is equivalent to:
image
Q9mediummcqPhysicsNEET 20172026
In a common emitter transistor amplifier the audio signal voltage across the collector is . The resistance of collector is . If current gain is and the base resistance is , the voltage and power gain of the amplifier is:
Q10easymcqPhysicsNEET 2020 E12026
The solids which have the negative temperature coefficient of resistance are:
Q11mediummcqPhysicsNEET (UG) 20242026
Consider the following statements A and B and identify the correct answer:A. For a solar-cell, the I-V characteristics lies in the IV quadrant of the given graph.B. In a reverse biased pn junction diode, the current measured in (), is due to majority charge carriers.
image
Q12mediummcqPhysicsAIEEE2026
The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than is incident on it. The band gap in () for the semiconductor is:
Q13easymcqPhysicsAIEEE2026
In a common base amplifier, the phase difference between the input signal voltage and output voltage is:
Q14easymcqPhysicsAIEEE 20032026
A strip of copper and another of germanium are cooled from room temperature to . The resistance of:
Q15mediummcqPhysicsAIEEE 20032026
The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the:
Q16mediummcqPhysicsAIEEE 20032026
In the middle of the depletion layer of a reverse-biased p-n junction, the:
Q17mediummcqPhysicsJEE Main2026
The characteristic of an LED is:
image
Q18mediummcqPhysicsIndian Competitive Exams2026
Which element is used for making solar cells?
Q19mediummcqPhysicsCompetitive Exam2026
Electric conduction in a semiconductor occurs due to:
Q20mediummcqGeneral StudiesCompetitive Exams2026
With an increase in temperature, the resistance of a pure semiconductor:
Q21mediummcqPhysicsIndian Competitive Exams2026
Electric conduction in a semiconductor occurs due to
Q22mediummcqPhysicsCompetitive Exam Practice Paper2026
Pure silicon at behaves as a/an:
Q23mediummcqPhysicsPhysics
0% accuracy
A full wave rectifier circuit with diodes () and () is shown in the figure. If input supply voltage , then at :

image
Q24mediummcqPhysicsPhysics
5% accuracy
The output () of the given logic implementation is similar to the output of an/a _________ gate.

image
Q25mediummcqPhysicsPhysics
0% accuracy
A transistor is operated in common emitter configuration at such that a change in the base current from to produces a change in the collector current from to . The current gain is:
Q26mediummcqPhysicsPhysics
0% accuracy
If a small amount of antimony is added to germanium crystal:
Q27mediummcqPhysicsPhysics
0% accuracy
In forward biasing of the - junction:
Q28mediummcqPhysicsPhysics
0% accuracy
Symbolic representation of four logic gates are shown as:(i) OR gate AND gate NOT gate [NAND gate]Pick out which ones are for AND, NAND and NOT gates, respectively:
image
Q29mediummcqPhysicsPhysics
100% accuracy
A common emitter amplifier has a voltage gain of , an input impedance of and an output impedance of . The power gain of the amplifier is:
Q30easymcqPhysicsPhysics
0% accuracy
In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is a/an:
Q31mediummcqPhysicsPhysics
0% accuracy
In the following circuit, the output for all possible inputs and is expressed by the truth table:ShutterstockExplore
Q32easymcqChemistryChemistry
With which one of the following elements silicon should be doped so as to give p-type of semiconductor?
Q33easymcqPhysicsPhysics
A transistor is operated in common-emitter configuration at such that a change in the base current from to produces a change in the collector current from to . The current gain is:
Q34hardmcqPhysicsPhysics
A p-n photodiode is made of a material with a band gap of . The minimum frequency of the radiation that can be absorbed by the material is nearly:
Q35mediummcqPhysicsPhysics
The circuit shown is equivalent to:
Q36mediummcqPhysicsPhysics
The voltage gain of an amplifier with negative feedback is . The voltage gain without feedback will be:
Q37mediummcqPhysicsPhysics
The following figure shows a logic gate circuit with two inputs A and B and the output C. The voltage waveforms of A, B, and C as shown below:(Assuming waveforms where C is high only when both A and B are high, matching a standard AND gate profile)The logic circuit gate is :
image
Q38easymcqPhysicsPhysics
Which of the following is an example of forward biasing?
Q39mediummcqPhysicsPhysics
A transistor is operated in common emitter configuration at constant collector voltage such that a change in the base current from to produces a change in the collector current from to . The current gain () is:
Q40mediummcqPhysicsPhysics
A transistor-oscillator using a resonant circuit with an inductance (of negligible resistance) and a capacitance has a frequency . If is doubled and is changed to , the frequency will be:
Q41mediummcqPhysicsPhysics
Assertion: In a common emitter transistor amplifier the input current is much less than the output current.Reason: The common emitter transistor amplifier has very high input impedance.
Q42mediummcqPhysicsPhysics
Assertion: The number of electrons in a -type silicon semiconductor is less than the number of electrons in a pure silicon semiconductor at room temperature.Reason: It is due to law of mass action.
Q43easymcqPhysicsPhysics
Assertion: The logic gate NOT can be built using diode.Reason: The output voltage and the input voltage of the diode have phase difference.
Q44easymcqPhysicsPhysics
In a semiconducting material the mobilities of electrons and holes are and respectively. Which of the following is true?
Q45mediummcqPhysicsPhysics
Consider an - - transistor amplifier in common-emitter configuration. The current gain of the transistor is . If the collector current changes by , what will be the change in emitter current?
Q46mediummcqPhysicsPhysics
A transistor is connected in common emitter configuration in a given amplifier. A load resistance of is connected in the collector circuit and the voltage drop across it is . If the current amplification factor is and the input resistance of the circuit is , the voltage gain and the power gain of the amplifier will respectively be:
Q47mediummcqPhysicsPhysics
Pure at has . Doping by Indium increases to . The doped semiconductor is:
Q48easymcqPhysicsPhysics
To get an output in the given circuit (AND gate with inputs and then OR gate with ), which of the following input will be correct:
image
Q49mediummcqPhysicsPhysics
Silicon transistor input resistance is . Base current changes by resulting in collector current change of . For a load resistance of in common emitter, voltage gain is:
Q50easymcqPhysicsPhysics
and both have same lattice structure, having bonding electrons in each. However, is insulator whereas is intrinsic semiconductor. This is because:
Q51easymcqPhysicsPhysics
In a n-type semiconductor, which of the following is true?
Q52easymcqPhysicsPhysics
In the given figure, a diode is connected to an external resistance and an e.m.f. of . If the barrier potential developed across the diode is , the current in the circuit will be:
image
Q53mediummcqPhysicsPhysics
To get output 1 for the following circuit, the correct choice for the input is:
image
Q54easymcqPhysicsPhysics
Consider the junction diode as ideal. The value of current flowing through is:
image
Q55mediummcqPhysicsPhysics
The symbolic representations of four logic gates are given. The symbols for OR, NOT and NAND gates are respectively:
image
Q56hardmcqPhysicsPhysics
For CE transistor amplifier, the audio signal voltage across the collector resistance of is . If the current amplification factor of the transistor is and the base resistance is , then the input signal voltage is:
Q57mediummcqPhysicsPhysics
The given circuit has two ideal diodes connected as shown in the figure below. The current flowing through the resistance will be:
image
Q58mediummcqPhysicsPhysics
What is the output in the following circuit, when all the three inputs are first 0 and then 1?
image
Q59mediummcqPhysicsPhysics
A Zener diode with is used in a regulator with and . Current through diode is:
image
Q60easymcqPhysicsPhysics
Which of the following statements is False?
Q61mediummcqPhysicsPhysics
In which of the following figures are the diodes forward biased?
image
Q62mediummcqPhysicsPhysics
A p-n photodiode is fabricated from a semiconductor with a band gap of . It can detect a signal of wavelength:

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