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Semiconductors Questions

Practice 57 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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57
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19
Easy
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36
Medium
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2
Hard
Practice by Exam:Physics(56)Chemistry(1)

About Semiconductors — practice questions, PYQs & concepts

Semiconductors is a frequently-tested topic on Physics, Chemistry. ExamTest.live currently lists 57 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 (56) and Chemistry (1). Click any exam chip above to drill down to that exam-specific question set.

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  • Start easy: 19 easy Semiconductors questions are available — build fluency before moving up.
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All Semiconductors Questions(1–57 of 57)

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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:
Q2mediummcqPhysicsAIEEE 20072026
0% accuracy
Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statements is most appropriate?
Q3mediummcqPhysicsAIEEE 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
Q4easymcqPhysicsNEET 20192026
0% accuracy
For a p-type semiconductor, which of the following statements is true?
Q5mediummcqPhysicsNEET 20192026
0% accuracy
The correct Boolean operation represented by the circuit diagram drawn is:
image
Q6easymcqPhysicsAIEEE2026
In a common base amplifier, the phase difference between the input signal voltage and output voltage is:
Q7mediummcqPhysicsNEET 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:
Q8easymcqPhysicsNEET 20172026
Which one of the following represents forward bias diode?
image
Q9easymcqPhysicsNEET 20172026
The given electrical network is equivalent to:
image
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:
Q13mediummcqPhysicsAIEEE 20032026
The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the:
Q14mediummcqPhysicsAIEEE 20032026
In the middle of the depletion layer of a reverse-biased p-n junction, the:
Q15easymcqPhysicsAIEEE 20032026
A strip of copper and another of germanium are cooled from room temperature to . The resistance of:
Q16mediummcqPhysicsJEE Main2026
The characteristic of an LED is:
image
Q17mediummcqPhysicsIndian Competitive Exams2026
Which element is used for making solar cells?
Q18mediummcqPhysicsPhysics
0% accuracy
A full wave rectifier circuit with diodes () and () is shown in the figure. If input supply voltage , then at :

image
Q19mediummcqPhysicsPhysics
6% accuracy
The output () of the given logic implementation is similar to the output of an/a _________ gate.

image
Q20mediummcqPhysicsPhysics
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:
Q21mediummcqPhysicsPhysics
0% accuracy
If a small amount of antimony is added to germanium crystal:
Q22mediummcqPhysicsPhysics
0% accuracy
In forward biasing of the - junction:
Q23mediummcqPhysicsPhysics
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
Q24easymcqChemistryChemistry
With which one of the following elements silicon should be doped so as to give p-type of semiconductor?
Q25hardmcqPhysicsPhysics
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:
Q26hardmcqPhysicsPhysics
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:
Q27mediummcqPhysicsPhysics
The circuit shown is equivalent to:
Q28mediummcqPhysicsPhysics
The voltage gain of an amplifier with negative feedback is . The voltage gain without feedback will be:
Q29mediummcqPhysicsPhysics
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
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
In the following circuit, the output for all possible inputs and is expressed by the truth table:ShutterstockExplore
Q32mediummcqPhysicsPhysics
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
Q33easymcqPhysicsPhysics
Which of the following is an example of forward biasing?
Q34mediummcqPhysicsPhysics
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:
Q35mediummcqPhysicsPhysics
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:
Q36mediummcqPhysicsPhysics
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.
Q37mediummcqPhysicsPhysics
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.
Q38easymcqPhysicsPhysics
Assertion: The logic gate NOT can be built using diode.Reason: The output voltage and the input voltage of the diode have phase difference.
Q39easymcqPhysicsPhysics
In a semiconducting material the mobilities of electrons and holes are and respectively. Which of the following is true?
Q40mediummcqPhysicsPhysics
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?
Q41easymcqPhysicsPhysics
and both have same lattice structure, having bonding electrons in each. However, is insulator whereas is intrinsic semiconductor. This is because:
Q42mediummcqPhysicsPhysics
A p-n photodiode is fabricated from a semiconductor with a band gap of . It can detect a signal of wavelength:
Q43easymcqPhysicsPhysics
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:
Q44easymcqPhysicsPhysics
Which of the following statements is False?
Q45mediummcqPhysicsPhysics
A Zener diode with is used in a regulator with and . Current through diode is:
image
Q46mediummcqPhysicsPhysics
In which of the following figures are the diodes forward biased?
image
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:
Q50mediummcqPhysicsPhysics
What is the output in the following circuit, when all the three inputs are first 0 and then 1?
image
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
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:
Q56mediummcqPhysicsPhysics
The symbolic representations of four logic gates are given. The symbols for OR, NOT and NAND gates are respectively:
image
Q57mediummcqPhysicsPhysics
The given circuit has two ideal diodes connected as shown in the figure below. The current flowing through the resistance will be:
image

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