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## Electronic Devices

### Physics

#### Previous Years Questions

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Identify the solar cell characteristics from the following options :
JEE Main 2022 (Online) 28th July Morning Shift
For a constant collector-emitter voltage of $$8 \mathrm{~V}$$, the collector current of a transistor reached to the valu...
JEE Main 2022 (Online) 27th July Evening Shift
A logic gate circuit has two inputs A and B and output Y. The voltage waveforms of A, B and Y are shown below. The logi...
JEE Main 2022 (Online) 27th July Morning Shift
In the circuit, the logical value of $$A=1$$ or $$B=1$$ when potential at $$A$$ or $$B$$ is $$5 \mathrm{~V}$$ and the lo...
JEE Main 2022 (Online) 25th July Morning Shift
The photodiode is used to detect the optical signals. These diodes are preferably operated in reverse biased mode becaus...
JEE Main 2022 (Online) 25th June Morning Shift
Identify the logic operation performed by the given circuit: ...
JEE Main 2022 (Online) 25th June Evening Shift
The positive feedback is required by an amplifier to act an oscillator. The feedback here means :
JEE Main 2022 (Online) 26th June Evening Shift
The I-V characteristics of a p-n junction diode in forward bias is shown in the figure. The ratio of dynamic resistance,...
JEE Main 2022 (Online) 26th June Morning Shift
Identify the correct Logic Gate for the following output (Y) of two inputs A and B. ...
JEE Main 2022 (Online) 27th June Morning Shift
For a transistor to act as a switch, it must be operated in
JEE Main 2022 (Online) 27th June Evening Shift
Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : n-p...
JEE Main 2022 (Online) 28th June Morning Shift
For using a multimeter to identify diode from electrical components, choose the correct statement out of the following a...
JEE Main 2022 (Online) 28th June Morning Shift
In the following circuit, the correct relation between output (Y) and inputs A and B will be : ...
JEE Main 2022 (Online) 28th June Morning Shift
In the given circuit the input voltage Vin is shown in figure. The cut-in voltage of p-n junction diode (D1 or D2) is 0....
JEE Main 2022 (Online) 28th June Evening Shift
In the given figure, each diode has a forward bias resistance of 30$$\Omega$$ and infinite resistance in reverse bias. T...
JEE Main 2021 (Online) 1st September Evening Shift
If VA and VB are the input voltages (either 5V or 0V) and V0 is the output voltage then the two gates represented in the...
JEE Main 2021 (Online) 31st August Evening Shift
Choose the correct waveform that can represent the voltage across R of the following circuit, assuming the diode is idea...
JEE Main 2021 (Online) 31st August Morning Shift
In the following logic circuit the sequence of the inputs A, B are (0, 0), (0, 1), (1, 0) and (1, 1). The output Y for t...
JEE Main 2021 (Online) 31st August Morning Shift
For a transistor $$\alpha$$ and $$\beta$$ are given as $$\alpha = {{{I_C}} \over {{I_E}}}$$ and $$\beta = {{{I_C}} \ov... JEE Main 2021 (Online) 27th August Evening Shift For a transistor in CE mode to be used as an amplifier, it must be operated in : JEE Main 2021 (Online) 27th August Morning Shift Four NOR gates are connected as shown in figure. The truth table for the given figure is :... JEE Main 2021 (Online) 26th August Evening Shift Statement I : By doping silicon semiconductor with pentavalent material, the electrons density increases.Statement II : ... JEE Main 2021 (Online) 26th August Morning Shift Identify the logic operation carried out by the given circuit :-... JEE Main 2021 (Online) 26th August Morning Shift Find the truth table for the function Y of A and B represented in the following figure.... JEE Main 2021 (Online) 27th July Evening Shift Identify the logic operation carried out.... JEE Main 2021 (Online) 25th July Morning Shift Consider a situation in which reserve biased current of a particular P-N junction increases when it is exposed to a ligh... JEE Main 2021 (Online) 22th July Evening Shift For the circuit shown below, calculate the value of Iz :... JEE Main 2021 (Online) 20th July Morning Shift The correct relation between$$\alpha$$(ratio of collector current to emitter current) and$$\beta$$(ratio of collecto... JEE Main 2021 (Online) 18th March Evening Shift Which one of the following will be the output of the given circuit?... JEE Main 2021 (Online) 17th March Evening Shift The output of the given combination gates represents :... JEE Main 2021 (Online) 17th March Morning Shift The following logic gate is equivalent to :... JEE Main 2021 (Online) 16th March Evening Shift Draw the output signal Y in the given combination of gates.... JEE Main 2021 (Online) 26th February Evening Shift LED is constructed from Ga-As-P semiconducting material. The energy gap of this LED is 1.9 eV. Calculate the wavelength ... JEE Main 2021 (Online) 26th February Morning Shift The truth table for the following logic circuit is :... JEE Main 2021 (Online) 25th February Evening Shift For extrinsic semiconductors; when doping level is increased; JEE Main 2021 (Online) 25th February Evening Shift A 5V battery is connected across the points X and Y. Assume D1 and D2 to be normal silicon diodes. Find the current supp... JEE Main 2021 (Online) 25th February Morning Slot Zener breakdown occurs in a p$$-$$n junction having p and n both : JEE Main 2021 (Online) 24th February Evening Slot Given below are two statements :Statement I : PN junction diodes can be used to function as transistor, simply by connec... JEE Main 2021 (Online) 24th February Evening Slot The logic circuit shown above is equivalent to :... JEE Main 2021 (Online) 24th February Evening Slot If an emitter current is changed by 4 mA, the collector current changes by 3.5 mA. The value of$$\beta$$will be : JEE Main 2021 (Online) 24th February Morning Slot Identify the correct output signal Y in the given combination of gates (as shown) for the given inputs A and B. ... JEE Main 2020 (Online) 6th September Morning Slot Two Zener diodes (A and B) having breakdown voltages of 6 V and 4 V respectively, are connected as shown in the circuit ... JEE Main 2020 (Online) 5th September Evening Slot With increasing biasing voltage of a photodiode, the photocurrent magnitude : JEE Main 2020 (Online) 5th September Morning Slot Identify the operation performed by the circuit given below : ... JEE Main 2020 (Online) 4th September Evening Slot Which of the following will NOT be observed when a multimeter (operating in resistance measuring mode) probes connected ... JEE Main 2020 (Online) 3rd September Evening Slot If a semiconductor photodiode can detect a photon with a maximum wavelength of 400 nm, then its band gap energy is : Pla... JEE Main 2020 (Online) 3rd September Evening Slot When a diode is forward biased, it has a voltage drop of 0.5 V. The safe limit of current through the diode is 10 mA. If... JEE Main 2020 (Online) 3rd September Morning Slot In the following digital circuit, what will be the output at ‘Z’, when the input (A, B) are (1, 0), (0, 0), (1, 1,), (0,... JEE Main 2020 (Online) 2nd September Evening Slot Take the breakdown voltage of the zener diode used in the given circuit as 6V. For the input voltage shown in figure bel... JEE Main 2020 (Online) 4th September Morning Slot Two identical capacitors A and B, charged to the same potential 5V are connected in two different circuits as shown belo... JEE Main 2020 (Online) 9th January Evening Slot In the given circuit, value of Y is : ... JEE Main 2020 (Online) 8th January Evening Slot Boolean relation at the output stage-Y for the following circuit is : ... JEE Main 2020 (Online) 8th January Morning Slot Which of the following gives a reversible operation? JEE Main 2020 (Online) 7th January Morning Slot Figure shows a DC voltage regulator circuit, with a Zener diode of breakdown voltage = 6V. If the unregulated input volt... JEE Main 2019 (Online) 12th April Evening Slot The transfer characteristic curve of a transistor, having input and output resistance 100$$\Omega $$and 100 k$$\Omega ...
JEE Main 2019 (Online) 12th April Morning Slot
The truth table for the circuit given in the fig. is: ...
JEE Main 2019 (Online) 12th April Morning Slot
The figure represents a voltage regulator circuit using a Zener diode. The breakdown voltage of the Zener diode is 6 V a...
JEE Main 2019 (Online) 10th April Evening Slot
An npn transistor operates as a common emitter amplifier, with a power gain of 60 dB. The input circuit resistance is 10...
JEE Main 2019 (Online) 10th April Morning Slot
The logic gate equivalent to the given logic circuit is :- ...
JEE Main 2019 (Online) 9th April Evening Slot
An NPN transistor is used in common emitter configuration as an amplifier with 1 k$$\Omega$$ load resistance. Signal vo...
JEE Main 2019 (Online) 9th April Morning Slot
A common emitter amplifier circuit, built using an npn transistor, is shown in the figure. Its dc current gain is 250, R...
JEE Main 2019 (Online) 8th April Evening Slot
The reverse breakdown voltage of a Zener diode is 5.6 V in the given circuit. The current IZ through the Zener is : ...
JEE Main 2019 (Online) 8th April Morning Slot
In the figure, given that VBB supply can vary from 0 to 5.0 V, VCC = 5V, $$\beta$$dc = 200, RB = 100 k$$\Omega$$, RC =...
JEE Main 2019 (Online) 12th January Evening Slot
The output of the given logic circuit is : ...
JEE Main 2019 (Online) 12th January Morning Slot
The circuit shown below contains two ideal diodes, each with a forward resistance of 50 $$\Omega$$. If the battery volt...
JEE Main 2019 (Online) 11th January Evening Slot
In the given circuit the current through Zener Diode is close to: ...
JEE Main 2019 (Online) 11th January Morning Slot
For the circuit shown below, the current through the Zener diode is - ...
JEE Main 2019 (Online) 10th January Evening Slot
To get output 1 at R, for the given logic gate circuit the input values must be ...
JEE Main 2019 (Online) 10th January Morning Slot
Ge and Si diodes start conducting at 0.3 V and 0.7 V respectively. In the following figure if Ge diode connection are re...
JEE Main 2019 (Online) 9th January Evening Slot
Mobility of electrons in a semiconductor is defined as the ratio of their drift velocity to the applied electric field. ...
JEE Main 2019 (Online) 9th January Morning Slot
In the given circuit, the current through zener diode is : ...
JEE Main 2018 (Online) 16th April Morning Slot
Truth table for the following digital circuit will be : ...
JEE Main 2018 (Online) 15th April Evening Slot
In a common emitter configuration with suitable bias, it is given that $${R_L}$$ is the load resistance and $${R_{BE}}... JEE Main 2018 (Online) 15th April Morning Slot The reading of the ammeter for a silicon diode in the given circuit is : ... JEE Main 2018 (Offline) The current gain of a common emitter amplifier is 69. If the emitter current is 7.0 mA, collector current is : JEE Main 2017 (Online) 9th April Morning Slot The V-I characteristic of a diode is shown in the figure. The ratio of forward to reverse bias resistance is : ... JEE Main 2017 (Online) 8th April Morning Slot What is the conductivity of a semiconductor sale having electron concentration of$$5 \times {10^{18}}\,\,{m^{ - 3}},$$... JEE Main 2017 (Online) 8th April Morning Slot In a common emitter amplifier circuit using an n-p-n transistor, the phase difference between the input and the output v... JEE Main 2017 (Offline) A realistic graph depicting the variation of the reciprocal of input resistance in an input characteristics measurement ... JEE Main 2016 (Online) 10th April Morning Slot To get an output of 1 from the circuit shown in figure the input must be : ... JEE Main 2016 (Online) 10th April Morning Slot The ratio (R) of output resistance r0, and the input resistance ri in measurements of input and output characteristics o... JEE Main 2016 (Online) 10th April Morning Slot An experiment is performed to determine the I - V characteristics of a Zener diode, which has a protective resistance of... JEE Main 2016 (Online) 9th April Morning Slot An unknown transistor needs to be identified as a npn or pnp type. A multimeter, with + ve and − ve terminals, is used t... JEE Main 2016 (Online) 9th April Morning Slot The truth table given in fig. represents : .tg {border-collapse:collapse;border-spacing:0;width:100%} .tg td{font-fami... JEE Main 2016 (Online) 9th April Morning Slot Identify the semiconductor devices whose characteristics are given below, in the order$$(a), (b), (c), (d)$$: ... JEE Main 2016 (Offline) If$$a, b, c, d$$are inputs to a gate and$$x$$is its output, then, as per the following time graph, the gate is : ... JEE Main 2016 (Offline) The forward biased diode connection is: JEE Main 2014 (Offline) The current voltage relation of diode is given by$${\rm I} = \left( {{e^{100V/T}} - 1} \right)mA,$$where the applied v... JEE Main 2014 (Offline) The$${\rm I}$$-$$V$$characteristic of an$$LED$$is JEE Main 2013 (Offline) A diode detector is used to detect an amplitude modulated wave of$$60\% $$modulation by using a condenser of capacity ... JEE Main 2013 (Offline) Truth table for system of four$$NAND$$gates as shown in figure is: ... AIEEE 2012 The combination of gates shown below yields ... AIEEE 2010 A$$p$$-$$n$$junction$$(D)$$shown in the figure can act as a rectifier. An alternating current source$$(V)$$is conn... AIEEE 2009 The logic circuit shown below has the input waveforms$$'A'$$and$$'B'$$as shown. Pick out the correct output waveform... AIEEE 2009 In the circuit below,$$A$$and$$B$$represent two inputs and$$C$$represents the output. The circuit represents... AIEEE 2008 A working transistor with its three legs marked$$P,Q$$and$$R$$is tested using a multi-meter. No conduction is found ... AIEEE 2008 If in a$$p$$-$$n$$junction diode, a square input signal of$$10V$$is applied as shown Then the output signal a... AIEEE 2007 Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statement... AIEEE 2007 If the lattice constant of this semiconductor is decreased, then which of the following is correct? ... AIEEE 2006 In the following, which one of the diodes is reverse biased? AIEEE 2006 The circuit has two oppositively connected ideal diodes in parallel. What is the current following in the circuit? ... AIEEE 2006 A solid which is not transparent to visible light and whose conductivity increases with temperature is formed by AIEEE 2006 If the ratio of the concentration of electrons to that of holes in a semiconductor is$${7 \over 5}$$and the ratio of c... AIEEE 2006 In a common base mode of a transistor, the collector current is$$5.488mA$$for an emitter current of$$5.60mA.$$T... AIEEE 2006 In a common base amplifier, the phase difference between the input signal voltage and output voltage is AIEEE 2005 In a full wave rectifier circuit operating from$$50Hz$$mains frequency, the fundamental frequency in the ripple w... AIEEE 2005 The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than$$248...
AIEEE 2005
When $$p$$-$$n$$ junction diode is forward biased then
AIEEE 2004
For a transistor amplifier in common emitter configuration for load impedance of $$1k\,\Omega$$ $$\left( {{h_{fe}} = 50... AIEEE 2004 The manifestation of band structure in solids is due to AIEEE 2004 A piece of copper and another of germanium are cooled from room temperature to$$77K,$$the resistance of AIEEE 2004 When$$npn$$transistor is used as an amplifer AIEEE 2004 In the middle of the depletion layer of a reverse- biased$$p$$-$$n$$junction, the AIEEE 2003 The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to ... AIEEE 2003 A strip of copper and another of germanium are cooled from room temperature to$$80K.$$The resistance of AIEEE 2003 The part of a transistor which is most heavily doped to produce large number of majority carriers is AIEEE 2002 The energy band gap is maximum in AIEEE 2002 By increasing the temperature, the specific resistance of a conductor and a semiconductor AIEEE 2002 Formation of covalent bonds in compounds exhibits AIEEE 2002 At absolute zero, Si acts as AIEEE 2002 ## Numerical More The typical transfer characteristics of a transistor in CE configuration is shown in figure. A load resistor of$$2 \,k ...
JEE Main 2022 (Online) 26th July Evening Shift
In the circuit shown below, maximum zener diode current will be _________ $$\mathrm{mA}$$. ...
JEE Main 2022 (Online) 26th July Morning Shift
Two ideal diodes are connected in the network as shown in figure. The equivalent resistance between A and B is _________...
JEE Main 2022 (Online) 25th July Evening Shift
The energy band gap of semiconducting material to produce violet (wavelength = 4000$$\mathop A\limits^o$$ ) LED is ____...
JEE Main 2022 (Online) 25th July Morning Shift
The circuit diagram used to study the characteristic curve of a zener diode is connected to variable power supply (0 $$-... JEE Main 2022 (Online) 30th June Morning Shift A transistor is used in common-emitter mode in an amplifier circuit. When a signal of 10 mV is added to the base-emitter... JEE Main 2022 (Online) 24th June Morning Shift In the given circuit, the value of current IL will be ____________ mA. (When RL = 1k$$\Omega$$) ... JEE Main 2022 (Online) 24th June Evening Shift In an experiment of CE configuration of n-p-n transistor, the transfer characteristics are observed as given in figure. ... JEE Main 2022 (Online) 25th June Evening Shift As per the given circuit, the value of current through the battery will be ____________ A. ... JEE Main 2022 (Online) 26th June Morning Shift The cut-off voltage of the diodes (shown in figure) in forward bias is 0.6 V. The current through the resister of 40$$\...
JEE Main 2022 (Online) 27th June Evening Shift
A zener of breakdown voltage Vz = 8 V and maximum zener current, IZM = 10 mA is subjectd to an input voltage Vi = 10 V w...
JEE Main 2022 (Online) 28th June Evening Shift
A potential barrier of 0.4 V exists across a p-n junction. An electron enters the junction from the n-side with a speed ...
JEE Main 2022 (Online) 29th June Evening Shift
A transistor is used in an amplifier circuit in common emitter mode. If the base current changes by 100 $$\mu$$A, it bri...
JEE Main 2022 (Online) 29th June Morning Shift
A zener diode of power rating 2W is to be used as a voltage regulator. If the zener diode has a breakdown of 10 V and it...
JEE Main 2021 (Online) 27th August Evening Shift
A circuit is arranged as shown in figure. The output voltage V0 is equal to ................... V....
JEE Main 2021 (Online) 27th August Morning Shift
For the given circuit, the power across Zener diode is .............. mW....
JEE Main 2021 (Online) 26th August Evening Shift
If the maximum value of accelerating potential provided by a ratio frequency oscillator is 12 kV. The number of revoluti...
JEE Main 2021 (Online) 26th August Evening Shift
In a semiconductor, the number density of intrinsic charge carries at 27$$^\circ$$C is 1.5 $$\times$$ 1016/m3. If the se...
JEE Main 2021 (Online) 25th July Evening Shift
In a given circuit diagram, a 5 V zener diode along with a series resistance is connected across a 50 V power supply. Th...
JEE Main 2021 (Online) 22th July Evening Shift
For the forward biased diode characteristics shown in the figure, the dynamic resistance at ID = 3 mA will be __________...
JEE Main 2021 (Online) 20th July Evening Shift
A zener diode having zener voltage 8 V and power dissipation rating of 0.5 W is connected across a potential divider arr...
JEE Main 2021 (Online) 20th July Evening Shift
The typical output characteristics curve for a transistor working in the common-emitter configuration is shown in the fi...
JEE Main 2021 (Online) 18th March Evening Shift
An npn transistor operates as a common emitter amplifier with a power gain of 106. The input circuit resistance is 100$$... JEE Main 2021 (Online) 18th March Morning Shift In the logic circuit shown in the figure, if input A and B are 0 to 1 respectively, the output at Y would be 'x'.The val... JEE Main 2021 (Online) 16th March Morning Shift The value of power dissipated across the zener diode (Vz = 15V) connected in the circuit as shown in the figure is x$$\...
JEE Main 2021 (Online) 16th March Morning Shift
The zener diode has a Vz = 30V. The current passing through the diode for the following circuit is ________ mA....
JEE Main 2021 (Online) 26th February Evening Shift
The circuit contains two diodes each with a forward resistance of 50$$\Omega$$ and with infinite reverse resistance. If ...
JEE Main 2021 (Online) 26th February Morning Shift
In connection with the circuit drawn below, the value of current flowing through 2 k$$\Omega$$ resistor is _________ $$\... JEE Main 2021 (Online) 24th February Morning Slot The output characteristics of a transistor is shown in the figure. When VCE is 10V and IC = 4.0 mA, then value of$$\be...
JEE Main 2020 (Online) 6th September Evening Slot
The circuit shown below is working as a 8 V dc regulated voltage source. When 12 V is used as input, the power dissipate...
JEE Main 2020 (Online) 9th January Evening Slot
Both the diodes used in the circuit shown are assumed to be ideal and have negligible resistance when these are forward ...
JEE Main 2020 (Online) 9th January Morning Slot

## MCQ (More than One Correct Answer)

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For a common emitter configuration, if $$\alpha$$ and $$\beta$$ have their usual meanings, the incorrect relationship ...
JEE Main 2016 (Offline)

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