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Electronic Devices

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Every question from past board papers on Electronic Devices, newest paper first. Open any question for its full worked answer.

NEET UG 2025 question paper (official, booklet 45)

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  1. The output (Y) of the given logic implementation is similar to the output of an/a ________ gate.

    logic circuit: inputs A,B,A; OR-bubble gate (NOR) and NAND-type bubble gate feeding an AND gate giving Y

    4 marks · See worked answer →

  2. A full wave rectifier circuit with diodes (\(D_1\)) and (\(D_2\)) is shown in the figure. If input supply voltage \(V_{in} = 220\sin(100\pi t)\) volt, then at \(t = 15\) msec

    full-wave rectifier: source V_in, centre-tapped transformer secondary, diodes D1 and D2, load R_L

    4 marks · See worked answer →

NEET UG 2024 question paper (official, booklet S6)

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  1. 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 (\(\mu A\)), is due to majority charge carriers.

    I-V axes with quadrants I-IV

    4 marks · See worked answer →

  2. The output (\(Y\)) of the given logic gate is similar to the output of an/a :

    logic circuit with NAND and NOR feeding an OR-type gate

    4 marks · See worked answer →

  3. A logic circuit provides the output \(Y\) as per the following truth table :

    | A | B | Y |

    |---|---|---|

    | 0 | 0 | 1 |

    | 0 | 1 | 0 |

    | 1 | 0 | 1 |

    | 1 | 1 | 0 |

    The expression for the output \(Y\) is :

    4 marks · See worked answer →

NEET UG 2023 question paper (official, booklet G6)

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  1. A full wave rectifier circuit consists of two p-n junction diodes, a centre-tapped transformer, capacitor and a load resistance. Which of these components remove the ac ripple from the rectified output?

    4 marks · See worked answer →

  2. Given below are two statements:

    Statement I : Photovoltaic devices can convert optical radiation into electricity.

    Statement II : Zener diode is designed to operate under reverse bias in breakdown region.

    In the light of the above statements, choose the most appropriate answer from the options given below :

    4 marks · See worked answer →

  3. For the following logic circuit, the truth table is:

    A and B each through a NOT gate, outputs into a NAND gate giving Y

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NEET UG 2022 question paper (official, booklet R6)

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  1. In the given circuits (a), (b) and (c), the potential drop across the two p-n junctions are equal in :

    three circuits (a),(b),(c) with two p-n junctions and a battery

    4 marks · See worked answer →

  2. In half wave rectification, if the input frequency is 60 Hz, then the output frequency would be :

    4 marks · See worked answer →

  3. The truth table for the given logic circuit is :

    logic circuit with diode, two NAND gates and an AND-type gate, inputs A,B output C

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NEET UG 2021 question paper (official, booklet M4)

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  1. Consider the following statements (A) and (B) and identify the correct answer.

    (A) A zener diode is connected in reverse bias, when used as a voltage regulator.

    (B) The potential barrier of p-n junction lies between 0.1 V to 0.3 V.

    4 marks · See worked answer →

  2. The electron concentration in an n-type semiconductor is the same as hole concentration in a p-type semiconductor. An external field (electric) is applied across each of them. Compare the currents in them.

    4 marks · See worked answer →

  3. 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 ?

    input waveforms A, B, C; logic circuit with AND, NAND, OR gates; four output waveform options

    4 marks · See worked answer →

NEET UG 2020 question paper (official, booklet E1)

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

    4 marks · See worked answer →

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

    4 marks · See worked answer →

  3. For the logic circuit shown, the truth table is :

    (figure: A and B each pass through a NOT gate; both outputs feed a NOR-type gate (OR gate with output bubble) giving Y)

    logic circuit: two NOT gates feeding an OR gate with output bubble

    4 marks · See worked answer →

NEET UG 2019 question paper (official, booklet P1)

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

    4 marks · See worked answer →

  2. The correct Boolean operation represented by the circuit diagram drawn is :

    switch circuit with +6V, two resistors R, LED(Y), switches A and B

    4 marks · See worked answer →

NEET UG 2018 question paper (official, booklet EE)

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  1. In the circuit shown in the figure, the input voltage V\(_i\) is 20 V, V\(_{BE}\) = 0 and V\(_{CE}\) = 0. The values of I\(_B\), I\(_C\) and \(\beta\) are given by

    transistor circuit with RB, RC, 20 V

    4 marks · See worked answer →

  2. In the combination of the following gates the output Y can be written in terms of inputs A and B as

    logic gate network (NOT, AND, OR)

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

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NEET UG 2017 question paper (official, booklet B)

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  1. In a common emitter transistor amplifier the audio signal voltage across the collector is 3 V. The resistance of collector is 3 k\(\Omega\). If current gain is 100 and the base resistance is 2 k\(\Omega\), the voltage and power gain of the amplifier is :

    4 marks · See worked answer →

  2. The given electrical network is equivalent to :

    logic network: inputs A,B into OR gate, then NOT-type gate stages to output Y

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  3. Which one of the following represents forward bias diode ?

    four diode-resistor circuits with voltages; options are pictures

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NEET UG 2016 Phase 1 question paper (official, booklet A)

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  1. Consider the junction diode as ideal. The value of current flowing through AB is :

    ideal diode and 1 kOhm resistor between A (+4 V) and B (-6 V)

    4 marks · See worked answer →

  2. A npn transistor is connected in common emitter configuration in a given amplifier. A load resistance of 800 \(\Omega\) is connected in the collector circuit and the voltage drop across it is 0.8 V. If the current amplification factor is 0.96 and the input resistance of the circuit is 192 \(\Omega\), the voltage gain and the power gain of the amplifier will respectively be :

    4 marks · See worked answer →

  3. To get output 1 for the following circuit, the correct choice for the input is :

    logic circuit: inputs A,B into OR gate, its output and C into AND gate, output Y

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NEET UG 2016 Phase 2 question paper (official, booklet ZZ)

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  1. For CE transistor amplifier, the audio signal voltage across the collector resistance of 2 k\(\Omega\) is 4 V. If the current amplification factor of the transistor is 100 and the base resistance is 1 k\(\Omega\), then the input signal voltage is

    4 marks · See worked answer →

  2. The given circuit has two ideal diodes connected as shown in the figure below. The current flowing through the resistance \(R_1\) will be

    10 V source, R1=2 ohm, diodes D1,D2 with R2=3 ohm, R3=2 ohm

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  3. What is the output \(Y\) in the following circuit, when all the three inputs \(A, B, C\) are first 0 and then 1?

    gate P (A,B inputs) feeding gate Q with C to output Y

    4 marks · See worked answer →