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Electronic Devices

Physics

(Past Years Questions)

MCQ (Single Correct Answer)

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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 ā€˜Zā€™, 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}},$$...
JEE Main 2017 (Online) 8th April Morning Slot
In a common emitter amplifier circuit using an n-p-n transistor, the phase difference between the input and the output v...
JEE Main 2017 (Offline)
To get an output of 1 from the circuit shown in figure the input must be : ...
JEE Main 2016 (Online) 10th April Morning Slot
A realistic graph depicting the variation of the reciprocal of input resistance in an input characteristics measurement ...
JEE Main 2016 (Online) 10th April Morning Slot
The ratio (R) of output resistance r0, and the input resistance ri in measurements of input and output characteristics o...
JEE Main 2016 (Online) 10th April Morning Slot
An experiment is performed to determine the I - V characteristics of a Zener diode, which has a protective resistance of...
JEE Main 2016 (Online) 9th April Morning Slot
An unknown transistor needs to be identified as a npn or pnp type. A multimeter, with + ve and āˆ’ ve terminals, is used t...
JEE Main 2016 (Online) 9th April Morning Slot
The truth table given in fig. represents : .tg {border-collapse:collapse;border-spacing:0;width:100%} .tg td{font-fami...
JEE Main 2016 (Online) 9th April Morning Slot
Identify the semiconductor devices whose characteristics are given below, in the order $$(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$$ junction diode, a square input signal of $$10$$ $$V$$ is applied as shown Then the output signal a...
AIEEE 2007
Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statement...
AIEEE 2007
If the lattice constant of this semiconductor is decreased, then which of the following is correct? ...
AIEEE 2006
In the following, which one of the diodes is reverse biased?
AIEEE 2006
The circuit has two oppositively connected ideal diodes in parallel. What is the current following in the circuit? ...
AIEEE 2006
A solid which is not transparent to visible light and whose conductivity increases with temperature is formed by
AIEEE 2006
If the ratio of the concentration of electrons to that of holes in a semiconductor is $${7 \over 5}$$ and the ratio of c...
AIEEE 2006
In a common base mode of a transistor, the collector current is $$5.488$$ $$mA$$ for an emitter current of $$5.60mA.$$ T...
AIEEE 2006
In a common base amplifier, the phase difference between the input signal voltage and output voltage is
AIEEE 2005
In a full wave rectifier circuit operating from $$50$$ $$Hz$$ mains frequency, the fundamental frequency in the ripple w...
AIEEE 2005
The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than $$248...
AIEEE 2005
When $$p$$-$$n$$ junction diode is forward biased then
AIEEE 2004
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
For a transistor amplifier in common emitter configuration for load impedance of $$1k\,\Omega $$ $$\left( {{h_{fe}} = 50...
AIEEE 2004
When $$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

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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
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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