How many questions from Electronic Devices appear in JEE?

Electronic Devices has appeared in 145 of the last 186 JEE Main and JEE Advanced papers — about 78% of them — contributing 179 questions in total across those papers.

Is Electronic Devices an important chapter for JEE?

Judged by how often it is actually tested, it appears in roughly 78% of papers. Chapters above about 50% are effectively guaranteed to show up every session, so they repay thorough preparation; lower-frequency chapters are better treated as targeted revision.

Where do these Electronic Devices questions come from?

Every question is from an official JEE Main or JEE Advanced paper, transcribed from the original paper and tagged to this chapter. Answers follow the official answer key.

Electronic Devices JEE Previous Year Questions with Answers

Q1·PhysicsSingle correctJEE Main 2026

The output

Y

for the given inputs

A

and

B

to the circuit is:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q2·PhysicsSingle correctJEE Main 2026

The maximum rated power of the LED is 2 mW and it is used in the circuit with input voltage of 5 V as shown in the figure below. The current through resistance

R_S

is 0.5 mA. The minimum value of the resistance of

R_S

, to ensure that the LED is not damaged is _______ kΩ.

(A)6
(B)2
(C)4
(D)5

Q3·PhysicsSingle correctJEE Main 2026

Refer to the logic circuit given below. For two inputs

(A = 1, B = 1)

and

(A = 0, B = 1)

, output

(Y)

will be __________.

(A)1, 0 respectively
(B)0, 1 respectively
(C)0, 0 respectively
(D)1, 1 respectively

Q4·PhysicsSingle correctJEE Main 2026

In a semiconductor p-n diode, the doping concentrations on p-side and n-side are 10

^{15}

atoms/cm

^{3}

and 10

^{18}

atoms/cm

^{3}

, respectively. Which one of the following statements is true ?

(A)Widths of depletion region on either side of the interface are equal
(B)The depletion region width is more on p-side compared to that in n-side
(C)The depletion region width is more on n-side compared to that in p-side
(D)No depletion region forms because of unequal doping concentrations on p and n-sides

Q5·PhysicsSingle correctJEE Main 2026

For the given logic circuit, which of the following inputs combination will make both LED−1 and LED−2 to glow?

(A) $A = 0, B = 1, C = 1$
(B) $A = 1, B = 0, C = 0$
(C) $A = 1, B = 0, C = 1$
(D) $A = 1, B = 1, C = 0$

Q6·PhysicsSingle correctJEE Main 2026

Consider a circuit consisting of a capacitor (

20\ \mu

F), resistor (

100\ \Omega

) and two identical diodes as shown in figure. The resistance of diode under forward biasing condition is

10\ \Omega

. The time constant of the circuit is

\alpha \times 10^{-3}

s. The value of

\alpha

is ______

(A)2.2
(B)2.0
(C)2.1
(D)2.4

Q7·PhysicsNumericalJEE Main 2026

A diode has Zener voltage of 10 V and maximum power dissipation of 0.5 W, then the minimum resistance to be used in series with this diode for safety when it is connected to a 25 V power supply is ______ Ω.

Q8·PhysicsSingle correctJEE Main 2026

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: A diode under reverse-biased condition provides very small current which is nearly independent of voltage until a critical limit at which the current increases drastically. Reason R: Below the critical voltage limit, only majority charge carriers flow which increases drastically above critical voltage. Choose the correct answer from the options given below

(A)Both A and R are true and R is the correct explanation of A
(B)Both A and R are true but R is NOT the correct explanation of A
(C)A is true but R is false
(D)A is false but R is true

Q9·PhysicsSingle correctJEE Main 2026

Two 4 bits binary numbers,

A = 1101

and

B = 1010

are given in the inputs of a logic circuit shown in figure below. The output

(Y)

will be:

(A) $Y = 1101$
(B) $Y = 0010$
(C) $Y = 0111$
(D) $Y = 1000$

Q10·PhysicsSingle correctJEE Main 2026

If

X

and

Y

are the inputs, the given circuit works as ______.

(A)OR gate
(B)AND gate
(C)NAND gate
(D)NOR gate

Q11·PhysicsSingle correctJEE Main 2026

Assuming in forward bias condition there is a voltage drop of 0.7 V across a silicon diode, the current through diode

D_{1}

in the circuit is ______ mA. (Assume all diodes in the given circuit are identical)

(A)20.15
(B)11.7
(C)17.6
(D)18.8

Q12·PhysicsSingle correctJEE Main 2026

Two p-n junction diodes

D_{1}

and

D_{2}

are connected as shown in figure. A and B are input signals and C is the output. The given circuit will function as a ____.

(A)OR Gate
(B)NOR Gate
(C)NAND Gate
(D)AND Gate

Q13·PhysicsNumericalJEE Main 2026

A voltage regulating circuit consisting of Zener diode, having break-down voltage of 10 V and maximum power dissipation of 0.4 W, is operated at 15 V. The approximate value of protective resistance in this circuit is ________ Ω.

Q14·PhysicsSingle correctJEE Main 2026

Identify the correct truth table of the given logical circuit.

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q15·PhysicsSingle correctJEE Main 2026

For the given logic gate circuit, which of the following is the correct truth table?

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q16·PhysicsSingle correctJEE Main 2026

The correct truth table for the given input data of the following logic gate is :

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q17·PhysicsSingle correctJEE Main 2026

Find the correct combination of A, B, C and D inputs which can cause the LED to glow.

(A)0100
(B)0011
(C)1000
(D)1101

Q18·PhysicsSingle correctJEE Main 2026

The given circuit works as :

(A)AND gate
(B)NOR gate
(C)NAND gate
(D)OR gate

Q19·PhysicsSingle correctJEE Main 2025

The output voltage in the following circuit is (Consider ideal diode case):

(A) $10$ V
(B) $0$ V
(C) $+5$ V
(D) $-5$ V

Q20·PhysicsSingle correctJEE Main 2025

Consider the following logic circuit. The output is

Y=0

when:

(A)A = 1 and B = 1
(B)A = 0 and B = 1
(C)A = 1 and B = 0
(D)A = 0 and B = 0

Q21·PhysicsSingle correctJEE Main 2025

In the following circuit (shown in the figure), the reading of the ammeter will be (Take Zener breakdown voltage = 4 V)

(A)24 mA
(B)80 mA
(C)10 mA
(D)60 mA

Q22·PhysicsSingle correctJEE Main 2025

The Boolean expression

Y=A\bar{B}C+\bar{A}\bar{C}

can be realised with which of the following gate configurations. A. One 3-input AND gate, 3 NOT gates and one 2-input OR gate, One 2-input AND gate, B. One 3-input AND gate, 1 NOT gate and one 2-input NOR gate and one 2-input OR gate C. 3-input OR gate, 3 NOT gates and one 2-input AND gate. Choose the correct answer from the options given below

(A)B, C Only
(B)A, B Only
(C)A, B, C Only
(D)A, C Only

Q23·PhysicsSingle correctJEE Main 2025

Consider a n-type semiconductor in which

n_e

and

n_h

are number of electrons and holes, respectively. (A) Holes are minority carriers. (B) The dopant is a pentavalent atom. (C)

n_e n_h \ne n_i^2

(where

n_i

is number of electrons or holes in semiconductor when it is in intrinsic form). (D)

n_e n_h \ge n_i^2

. (E) The holes are not generated due to the donors. Choose the correct answer from the options given below:

(A)(A), (C), (D) only
(B)(A), (C), (E) only
(C)(A), (B), (E) only
(D)(A), (B), (C) only

Q24·PhysicsSingle correctJEE Main 2025

The truth table corresponding to the circuit given below is:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q25·PhysicsSingle correctJEE Main 2025

Choose the correct logic circuit (shown in the figure) for the given truth table having inputs A and B. Truth table — inputs

(A,B)\to

output

Y

:

(0,0)\to0

,

(0,1)\to0

,

(1,0)\to1

,

(1,1)\to1

.

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q26·PhysicsSingle correctJEE Main 2025

In the digital circuit shown in the figure, for the given inputs the P and Q values are:

(A) $P=1, Q=1$
(B) $P=0, Q=0$
(C) $P=0, Q=1$
(D) $P=1, Q=0$

Q27·PhysicsSingle correctJEE Main 2025

A zener diode with 5V zener voltage is used to regulate an unregulated dc voltage input of 25 V. For a 400

\Omega

resistor connected in series, the zener current is found to be 4 times load current. The load current (

I_L

) and load resistance (

R_L

) are:

(A) $I_L=20$ mA; $R_L=250\ \Omega$
(B) $I_L=10$ mA; $R_L=0.5\ \Omega$
(C) $I_L=0.02$ mA; $R_L=250\ \Omega$
(D) $I_L=10$ mA; $R_L=500\ \Omega$

Q28·PhysicsSingle correctJEE Main 2025

The truth table for the logic circuit given in the figure (inputs A, B; output Y) is:

(A)A,B→Y: (0,0)→0, (0,1)→1, (1,0)→1, (1,1)→0
(B)A,B→Y: (0,0)→0, (1,0)→0, (1,1)→1, (0,1)→1
(C)A,B→Y: (0,0)→0, (1,0)→1, (0,1)→0, (1,1)→0
(D)A,B→Y: (0,0)→0, (1,1)→1, (1,0)→1, (0,1)→1

Q29·PhysicsSingle correctJEE Main 2025

For the logic circuit shown in the figure (inputs A and B, output Y), the equivalent GATE is:

(A)OR gate
(B)NOT gate
(C)AND gate
(D)NAND gate

Q30·PhysicsSingle correctJEE Main 2025

Which of the following circuits has the same output as that of the given circuit? (The given circuit takes inputs A and B through an inverter and two AND gates feeding a NOR gate to produce output Y.)

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q31·PhysicsSingle correctJEE Main 2025

In the circuit shown here, assuming threshold voltage of diode is negligibly small, then voltage

V_{AB}

is correctly represented by:

(A) $V_{AB}$ would be zero at all times
(B)a full sine wave (both half cycles appear)
(C)positive half-wave humps only
(D)negative half-wave humps only

Q32·PhysicsSingle correctJEE Main 2025

The output of the circuit (shown in the figure) is low (zero) for : (A) X=0, Y=0 (B) X=0, Y=1 (C) X=1, Y=0 (D) X=1, Y=1. Choose the correct answer from the options given below :

(A)(A), (C) and (D) only
(B)(A), (B) and (C) only
(C)(B), (C) and (D) only
(D)(A), (B) and (D) only

Q33·PhysicsSingle correctJEE Main 2025

Consider the following statements : A. The junction area of solar cell is made very narrow compared to a photo diode. B. Solar cells are not connected with any external bias. C. LED is made of lightly doped p-n junction. D. Increase of forward current results in continuous increase of LED light intensity. E. LEDs have to be connected in forward bias for emission of light. Choose the correct answer from the options given below :

(A)B, D, E Only
(B)A, C Only
(C)A, C, E Only
(D)B, E Only

Q34·PhysicsSingle correctJEE Main 2025

Refer to the circuit diagram given in the figure, which of the following observation of circuit are correct? A. Total resistance of circuit is 6 Ω. B. Current in Ammeter is 1A. C. Potential across AB is 4 Volts. D. Potential across CD is 4 Volts. E. Total resistance of the circuit is 8Ω. Choose the correct answer from the options given below :

(A)A, B and D only
(B)A, C and D only
(C)B, C and E only
(D)A, B and C only

Q35·PhysicsSingle correctJEE Main 2025

What is the current through the battery in the circuit shown below?

(A) $1.0$ A
(B) $1.5$ A
(C) $0.5$ A
(D) $0.25$ A

Q36·PhysicsSingle correctJEE Main 2025

Which of the following circuits represents a forward-biased diode? (See figure for circuits (A)–(E) with their node potentials and diode orientations.)

(A)(B), (D) and (E) only
(B)(A) and (D) only
(C)(B), (C) and (E) only
(D)(C) and (E) only

Q37·PhysicsSingle correctJEE Main 2024

The

I

-

V

characteristics of an electronic device is shown in the figure. The device is:

(A)a solar cell
(B)a transistor which can be used as an amplifier
(C)a zener diode which can be used as a voltage regulator
(D)a diode which can be used as a rectifier

Q38·PhysicsSingle correctJEE Main 2024

A light emitting diode (LED) is fabricated using GaAs semiconducting material whose band gap is 1.42 eV. The wavelength of light emitted from the LED is:

(A)650 nm
(B)1243 nm
(C)875 nm
(D)1400 nm

Q39·PhysicsSingle correctJEE Main 2024

In the truth table of the logic circuit shown in the figure, the values of X and Y are:

(A)1, 1
(B)1, 0
(C)0, 1
(D)0, 0

Q40·PhysicsSingle correctJEE Main 2024

The output

Y

of following circuit for given inputs is:

(A) $A\cdot\overline{(A+B)}$
(B) $A\cdot B$
(C) $0$
(D) $\bar A\cdot B$

Q41·PhysicsNumericalJEE Main 2024

A potential divider circuit is connected with a dc source of 20 V, a light emitting diode of glow in voltage 1.8 V and a zener diode of breakdown voltage of 3.2 V. The length (PR) of the resistive wire is 20 cm. The minimum length of PQ to just glow the LED is ________ cm.

Q42·PhysicsSingle correctJEE Main 2024

The acceptor level of a p-type semiconductor is 6eV. The maximum wavelength of light which can create a hole would be : Given

hc = 1242

eV nm.

(A)407 nm
(B)414 nm
(C)207 nm
(D)103.5 nm

Q43·PhysicsSingle correctJEE Main 2024

A combination of logic gates is connected in a complete suitable circuit (shown in the figure). For which of the following input combinations will the bulb glow (ON)?

(A)A = 0, B = 1, C = 1, D = 1
(B)A = 1, B = 0, C = 0, D = 0
(C)A = 0, B = 0, C = 0, D = 1
(D)A = 1, B = 1, C = 1, D = 0

Q44·PhysicsSingle correctJEE Main 2024

The output (Y) of the logic circuit given below is 0 only when:

(A)A = 1, B = 0
(B)A = 0, B = 0
(C)A = 1, B = 1
(D)A = 0, B = 1

Q45·PhysicsSingle correctJEE Main 2024

Identify the logic gate given in the circuit (shown in the figure):

(A)NAND - gate
(B)OR - gate
(C)AND gate
(D)NOR gate

Q46·PhysicsSingle correctJEE Main 2024

Which of the diode circuit shows correct biasing used for the measurement of dynamic resistance of p-n junction diode?

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q47·PhysicsSingle correctJEE Main 2024

The value of net resistance of the network as shown in the given figure is:

(A) $\dfrac52\,\Omega$
(B) $\dfrac{15}{4}\,\Omega$
(C) $6\,\Omega$
(D) $\dfrac{30}{11}\,\Omega$

Q48·PhysicsSingle correctJEE Main 2024

The output of the given circuit diagram (shown in the figure) is

(A)A,B,Y: (0,0)→0, (1,0)→0, (0,1)→0, (1,1)→1
(B)A,B,Y: (0,0)→0, (1,0)→1, (0,1)→1, (1,1)→0
(C)A,B,Y: (0,0)→0, (1,0)→0, (0,1)→0, (1,1)→0
(D)A,B,Y: (0,0)→0, (1,0)→0, (0,1)→1, (1,1)→0

Q49·PhysicsSingle correctJEE Main 2024

Identify the logic operation performed by the given circuit.

(A)NAND
(B)NOR
(C)OR
(D)AND

Q50·PhysicsSingle correctJEE Main 2024

A Zener diode of breakdown voltage

10\,V

is used as a voltage regulator as shown in the figure. The current through the Zener diode is:

(A) $50\,mA$
(B) $0$
(C) $30\,mA$
(D) $20\,mA$

Q51·PhysicsSingle correctJEE Main 2024

In the given circuit, the voltage across resistance

(R_L)

will be:

(A)8.75 V
(B)9.00 V
(C)8.50 V
(D)14.00 V

Q52·PhysicsSingle correctJEE Main 2024

In the given circuit, the breakdown voltage of the Zener diode is 3.0 V. What is the value of

I_z

?

(A)3.3 mA
(B)5.5 mA
(C)10 mA
(D)7 mA

Q53·PhysicsSingle correctJEE Main 2024

The truth table for the given circuit is:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q54·PhysicsSingle correctJEE Main 2024

The truth table of the given circuit diagram is :

(A) $\begin{array}{ccc} A&B&Y\\ 0&0&0\\ 0&1&0\\ 1&0&0\\ 1&1&1\end{array}$
(B) $\begin{array}{ccc} A&B&Y\\ 0&0&0\\ 0&1&1\\ 1&0&1\\ 1&1&0\end{array}$
(C) $\begin{array}{ccc} A&B&Y\\ 0&0&0\\ 0&1&1\\ 1&0&1\\ 1&1&1\end{array}$
(D) $\begin{array}{ccc} A&B&Y\\ 0&0&1\\ 0&1&1\\ 1&0&1\\ 1&1&0\end{array}$

Q55·PhysicsSingle correctJEE Main 2024

Which of the following circuits is reverse-biased?

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q56·PhysicsSingle correctJEE Main 2023

The output from a NAND gate having inputs A and B given below will be:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q57·PhysicsSingle correctJEE Main 2023

For the following circuit and given inputs

A

and

B

, choose the correct option for output

'Y'

:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q58·PhysicsNumericalJEE Main 2023

From the given transfer characteristic of a transistor in CE configuration, the value of power gain of this configuration is

10^{x}

, for

R_{B}=10\,k\Omega

and

R_{C}=1\,k\Omega

. The value of

x

is _____.

Q59·PhysicsSingle correctJEE Main 2023

In an n-p-n common emitter (CE) transistor the collector current changes from 5 mA to 16 mA for the change in base current from 100

\mu

A and 200

\mu

A, respectively. The current gain of transistor is _________.

(A)110
(B)0.9
(C)210
(D)9

Q60·PhysicsSingle correctJEE Main 2023

The logic operation performed by the given digital circuit is equivalent to:

(A)AND
(B)NOR
(C)OR
(D)NAND

Q61·PhysicsSingle correctJEE Main 2023

The logic performed by the circuit shown in figure is equivalent to :

(A)AND
(B)NAND
(C)OR
(D)NOR

Q62·PhysicsSingle correctJEE Main 2023

A zener diode of power rating 1.6 W is to be used as voltage regulator. If the zener diode has a breakdown of 8V and it has to regulate voltage fluctuating between 3V and 10 V, the value of resistance R for safe operation of diode will be:

(A) $13.3\,\Omega$
(B) $12\,\Omega$
(C) $10\,\Omega$
(D) $11\,\Omega$

Q63·PhysicsSingle correctJEE Main 2023

If each diode has a forward bias resistance of

25\,\Omega

in the circuit shown in the figure, which of the following options is correct:

(A) $\tfrac{I_1}{I_4}=1$
(B) $\tfrac{I_3}{I_4}=1$
(C) $\tfrac{I_3}{I_2}=1$
(D) $\tfrac{I_1}{I_2}=2$

Q64·PhysicsSingle correctJEE Main 2023

For a given transistor amplifier circuit in CE configuration

V_{CC}=1

V,

R_c=1

k

\Omega

,

R_b=100

k

\Omega

and

\beta=100

. The value of base current

I_b

is

(A) $I_b=1.0\ \mu A$
(B) $I_b=0.10\ \mu A$
(C) $I_b=100\ \mu A$
(D) $I_b=10\ \mu A$

Q65·PhysicsSingle correctJEE Main 2023

For the logic circuit shown, the output waveform at Y is:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q66·PhysicsSingle correctJEE Main 2023

Name the logic gate equivalent to the diagram attached:

(A)OR
(B)NOR
(C)NAND
(D)AND

Q67·PhysicsSingle correctJEE Main 2023

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Diffusion current in a p-n junction is greater than the drift current in magnitude if the junction is forward biased. Reason R: Diffusion current in a p-n junction is from the n-side to the p-side if the junction is forward biased. In the light of the above statements, choose the most appropriate answer from the options given below

(A)Both A and R are correct and R is the correct explanation of A
(B)Both A and R are correct but R is NOT the correct explanation of A
(C)A is correct but R is not correct
(D)A is not correct but R is correct

Q68·PhysicsSingle correctJEE Main 2023

The resistivity

(\rho)

of semiconductor varies with temperature. Which of the following curve represents the correct behaviour:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q69·PhysicsSingle correctJEE Main 2023

Choose the correct statement about Zener diode:

(A)It works as a voltage regulator in forward bias and behaves like simple pn junction diode in reverse bias.
(B)It works as a voltage regulator only in forward bias.
(C)It works as a voltage regulator in both forward and reverse bias.
(D)It works as a voltage regulator in reverse bias and behaves like simple pn junction diode in forward bias.

Q70·PhysicsSingle correctJEE Main 2023

Match List I (type of semiconductor/conductor) with List II (position of the Fermi-level). Choose the correct answer from the options given below:

List I	List II
A.Intrinsic semiconductor	I.Fermi-level near the valence band
B.n-type semiconductor	II.Fermi-level in the middle of valence and conduction band
C.p-type semiconductor	III.Fermi-level near the conduction band
D.Metals	IV.Fermi-level inside the conduction band

(A)A-II, B-III, C-I, D-IV
(B)A-I, B-II, C-III, D-IV
(C)A-II, B-I, C-III, D-IV
(D)A-III, B-I, C-II, D-IV

Q71·PhysicsSingle correctJEE Main 2023

The effect of increase in temperature on the number of electrons in conduction band

(n_e)

and resistance of a semiconductor will be as:

(A)Both $n_e$ and resistance increase
(B)Both $n_e$ and resistance decrease
(C) $n_e$ decreases, resistance increases
(D) $n_e$ increases, resistance decreases

Q72·PhysicsSingle correctJEE Main 2023

Given below are two statements: Statement I: In a typical transistor, all three regions emitter, base and collector have same doping level. Statement II: In a transistor, collector is the thickest and base is the thinnest segment. In the light of the above statements, choose the most appropriate answer from the options given below.

(A)Both Statement I and Statement II are correct
(B)Statement I is incorrect but Statement II is correct
(C)Statement I is correct but Statement II is incorrect
(D)Both Statement I and Statement II are incorrect

Q73·PhysicsSingle correctJEE Main 2023

The output Y for the inputs A and B of the circuit shown in the figure is given by the truth table (choose the correct truth table from the options shown in the figure):

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q74·PhysicsSingle correctJEE Main 2023

The output waveform of the given logical circuit for the following inputs A and B as shown below, is

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q75·PhysicsSingle correctJEE Main 2023

For the given logic gates combination, the correct truth table will be:

(A)(1)
(B)(2)
(C)(3)
(D)(4)

Q76·PhysicsSingle correctJEE Main 2023

Which one of the following statements is not correct in the case of light emitting diodes? A. It is a heavily doped p-n junction. B. It emits light only when it is forward biased. C. It emits light only when it is reverse biased. D. The energy of the light emitted is equal to or slightly less than the energy gap of the semiconductor used. Choose the correct answer from the options given below:

(A)A
(B)C and D
(C)C
(D)B

Q77·PhysicsSingle correctJEE Main 2023

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Photodiodes are used in forward bias usually for measuring the light intensity. Reason R: For a p-n junction diode, at applied voltage V the current in the forward bias is more than the current in the reverse bias for

|V_z|\ge\pm V\ge|V_b|

where

V_b

is the threshold voltage and

V_z

is the breakdown voltage. In the light of the above statements, choose the correct answer from the options given below:

(A)Both A and R are true and R is the correct explanation of A
(B)Both A and R are true but R is NOT the correct explanation of A
(C)A is true but R is false
(D)A is false but R is true

Q78·PhysicsSingle correctJEE Main 2023

Statement I: When a Si sample is doped with Boron, it becomes P type and when doped by Arsenic it becomes N-type semi conductor such that P-type has excess holes and N-type has excess electrons. Statement II: When such P-type and N-type semi-conductors, are fused to make a junction, a current will automatically flow which can be detected with an externally connected ammeter. In the light of above statements, choose the most appropriate answer from the options given below:

(A)Both Statement I and statement II are correct
(B)Statement I is incorrect but statement II is correct
(C)Both Statement I and Statement II are incorrect
(D)Statement I is correct but statement II is incorrect

Q79·PhysicsSingle correctJEE Main 2023

The logic gate equivalent to the given circuit diagram is:

(A)NAND
(B)OR
(C)AND
(D)NOR

Q80·PhysicsAssertion & ReasonJEE Main 2023

Assertion A: Photodiodes are preferably operated in reverse bias condition for light intensity measurement. Reason R: The current in the forward bias is more than the current in the reverse bias for a

p-n

junction diode. In the light of the above statements, choose the correct answer from the options given below:

(A)A is true but R is false
(B)A is false but R is true
(C)Both A and R are true and R is the correct explanation of A
(D)Both A and R are true but R is NOT the correct explanation of A

Q81·PhysicsNumericalJEE Main 2022

A 8 V Zener diode along with a series resistance R is connected across a 20 V supply (as shown in the figure). If the maximum Zener current is 25 mA, then the minimum value of R will be ______Ω.

Q82·PhysicsNumericalJEE Main 2022

If the potential barrier across a p-n junction is 0.6 V. Then the electric field intensity, in the depletion region having the width of

6 \times 10^{-6}

m, will be __________

\times 10^{5}

N/C.

Q83·PhysicsSingle correctJEE Main 2022

An n.p.n transistor with current gain

\beta

= 100 in common emitter configuration is shown in figure. The output voltage of the amplifier will be

(A)0.1 V
(B)1.0 V
(C)10 V
(D)100 V

Q84·PhysicsSingle correctJEE Main 2022

Identify the solar cell characteristics from the following options :

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q85·PhysicsSingle correctJEE Main 2022

In the case of amplitude modulation to avoid distortion the modulation index (μ) should be :

(A)μ ≤ 1
(B)μ ≥ 1
(C)μ = 2
(D)μ = 0

Q86·PhysicsSingle correctJEE Main 2022

A square wave of the modulating signal is shown in the figure. The carrier wave is given by C(t) = 5 sin (8 πt) Volt. The modulation index is :

(A)0.2
(B)0.1
(C)0.3
(D)0.4

Q87·PhysicsSingle correctJEE Main 2022

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 logic gate circuit is

(A)AND gate
(B)OR gate
(C)NOR gate
(D)NAND gate

Q88·PhysicsSingle correctJEE Main 2022

For a constant collector-emitter voltage of 8V, the collector current of a transistor reached to the value of 6 mA from 4 mA, whereas base current changed from 20 μA to 25 μA value. If transistor is in active state, small signal current gain (current amplification factor) will be :

(A)240
(B)400
(C)0.0025
(D)200

Q89·PhysicsNumericalJEE Main 2022

The typical transfer characteristic of a transistor in CE configuration is shown in figure. A load resistor of 2

k\Omega

is connected in the collector branch of the circuit used. The input resistance of the transistor is 0.50

k\Omega

. The voltage gain of the transistor is

Q90·PhysicsNumericalJEE Main 2022

In the circuit shown below, maximum zener diode current will be _____mA

Q91·PhysicsNumericalJEE Main 2022

The energy band gap of semiconducting material to produce violet (wavelength = 4000 Å) LED is _______ eV. (Round off to the nearest integer).

Q92·PhysicsSingle correctJEE Main 2022

In the circuit, the logical value of A = 1 or B = 1 when potential at A or B is 5V and the logical value of A = 0 or B = 0 when potential at A or B is 0 V. The truth table of the given circuit will be :

(A)A B Y 0 0 0 1 0 0 0 1 0 1 1 1
(B)A B Y 0 0 0 1 0 1 0 1 1 1 1 1
(C)A B Y 0 0 0 1 0 0 0 1 0 1 1 0
(D)A B Y 0 0 1 1 0 1 0 1 1 1 1 0

Q93·PhysicsNumericalJEE Main 2022

A transistor is used in an amplifier circuit in common emitter mode. If the base current changes by 100 μA, it brings a change of 10 mA in collector current. If the load resistance is 2 kΩ and input resistance is 1 kΩ, the value of power gain is

x \times 10^4

. The value of x is ________.

Q94·PhysicsNumericalJEE Main 2022

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 of

6.0 \times 10^5

ms

^{-1}

. The speed with which electron enters the p side will be

\frac{x}{3} \times 10^5

ms

^{-1}

the value of x is ________. (Given mass of electron =

9 \times 10^{-31}

kg, charge on electron =

1.6 \times 10^{-19}

C.)

Q95·PhysicsSingle correctJEE Main 2022

In the given circuit the input voltage V

_{in}

is shown in figure. The cut–in voltage of p–n junction diode (D

_1

or D

_2

) is 0.6 V. Which of the following output voltage (V

_0

) waveform across the diode is correct?

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q96·PhysicsSingle correctJEE Main 2022

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : n-p-n transistor permits more current than a p-n-p transistor. Reason R : Electrons have greater mobility as a charge carrier. Choose the correct answer from the options given below :

(A)Both A and R true. and R is correct explanation of A.
(B)Both A and R are true but R is NOT the correct explanation of A.
(C)A is true but R is false.
(D)A is false but R is true.

Q97·PhysicsNumericalJEE Main 2022

A Zener of breakdown voltage V

_Z

= 8V and maximum zener current, I

_{ZM}

= 10 mA is subjected to an input voltage V

_i

= 10V with series resistance R = 100Ω. In the given circuit R

_L

represents the variable load resistance. The ratio of maximum and minimum value of R

_L

is ________

Q98·PhysicsSingle correctJEE Main 2022

In the following circuit, the correct relation between output (Y) and inputs A and B will be :

(A) $Y = AB$
(B) $Y = A + B$
(C) $Y = \overline{AB}$
(D) $Y = \overline{A + B}$

Q99·PhysicsNumericalJEE Main 2022

The cut-off voltage of the diodes (shown in figure) in forward bias is 0.6 V. The current through the resister of 40

\Omega

is ________ mA.

Q100·PhysicsSingle correctJEE Main 2022

For a transistor to act as a switch, it must be operated in

(A)Active region
(B)Saturation state only
(C)Cut-off state only
(D)Saturation and cut-off state

Q101·PhysicsSingle correctJEE Main 2022

Identify the correct Logic Gate for the following output (Y) of two inputs A and B.

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q102·PhysicsSingle correctJEE Main 2022

The I-V characteristics of a p-n junction diode in forward bias is shown in the figure. The ratio of dynamic resistance, corresponding to forward bias voltages of 2V and 4V respectively, is :

(A)1 : 2
(B)5 : 1
(C)1 : 40
(D)20 : 1

Q103·PhysicsNumericalJEE Main 2022

As per the given circuit, the value of current through the battery will be ........... A.

Q104·PhysicsSingle correctJEE Main 2022

The positive feedback is required by an amplifier to act an oscillator. The feedback here means :

(A)External input is necessary to sustain ac signal in output.
(B)A portion of the output power is returned back to the input.
(C)Feedback can be achieved by LR network.
(D)The base-collector junction must be forward biased.

Q105·PhysicsNumericalJEE Main 2022

In an experiment of CE configuration of n-p-n transistor, the transfer characteristics are observed as given in figure. If the input resistance is 200Ω and output resistance is 60 Ω the voltage gain in this experiment will be ______

Q106·PhysicsSingle correctJEE Main 2022

Identify the logic operation performed by the given circuit :

(A)AND gate
(B)OR gate
(C)NOR gate
(D)NAND gate

Q107·PhysicsSingle correctJEE Main 2022

The photodiode is used to detect the optiocal signals. These diodes are preferably operated in reverse biased mode because.

(A)fractional change in majority carriers produce higher forward bias current
(B)fractional change in majority carriers produce higher reverse bias current
(C)fractional change in minority carriers produce higher forward bias current
(D)fractional change in minority carriers produce higher reverse bias current

Q108·PhysicsNumericalJEE Main 2022

In the given circuit- the value of current I

_L

will be ______ mA. (When R

_L

= 1 k

\Omega

)

Q109·PhysicsNumericalJEE Main 2022

A transistor is used in common-emitter mode in an amplifier circuit. When a signal of 10 mV is added to the base-emitter voltage, the base current changes by 10

\mu

A and the collector current changes by 1.5 mA. The load resistance is 5 k

\Omega

. The voltage gain of the transistor will be ______ .

Q110·PhysicsSingle correctJEE Main 2021

In the given figure, each diode has a forward bias resistance of 30Ω and infinite resistance in reverse bias. The current I

_{1}

will be :

(A)3.75 A
(B)2.35 A
(C)2 A
(D)2.73 A

Q111·PhysicsSingle correctJEE Main 2021

If

V_A

and

V_B

are the input voltages (either 5V or 0V) and

V_o

is the output voltage then the two gates represented in the following circuit (A) and (B) are:-

(A)AND and OR Gate
(B)OR and NOT Gate
(C)NAND and NOR Gate
(D)AND and NOT Gate

Q112·PhysicsSingle correctJEE Main 2021

Statement-I : To get a steady dc output from the pulsating voltage received from a full wave rectifier we can connect a capacitor across the output parallel to the load

R_L

. Statement-II : To get a steady dc output from the pulsating voltage received from a full wave rectifier we can connect an inductor in series with

R_L

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

(A)Statement I is true but Statement II is false
(B)Statement I is false but Statement II is true
(C)Both Statement I and Statement II are false
(D)Both Statement I and Statement II are true

Q113·PhysicsSingle correctJEE Main 2021

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 this sequence will be :

(A)1, 0, 1, 0
(B)0, 1, 0, 1
(C)1, 1, 1, 0
(D)0, 0, 1, 1

Q114·PhysicsNumericalJEE Main 2021

A circuit is arranged as shown in figure. The output voltage

V_0

is equal to ....... V.

Q115·PhysicsSingle correctJEE Main 2021

For a transistor in CE mode to be used as an amplifier, it must be operated in :

(A)Both cut-off and Saturation
(B)Saturation region only
(C)Cut-off region only
(D)The active region only

Q116·PhysicsSingle correctJEE Main 2021

For a transistor α and β are given as

\alpha = \frac{I_{C}}{I_{E}}

and

\beta = \frac{I_{C}}{I_{B}}

. Then the correct relation between α and β will be :

(A) $\alpha = \frac{1-\beta}{\beta}$
(B) $\beta = \frac{\alpha}{1-\alpha}$
(C) $\alpha\beta = 1$
(D) $\alpha = \frac{\beta}{1-\beta}$

Q117·PhysicsNumericalJEE Main 2021

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 has to regulate voltage fluctuated between 6 V and 14 V, the value of

R_s

for safe operation should be ________ Ω.

Q118·PhysicsNumericalJEE Main 2021

For the given circuit, the power across zener diode is ............ mW.

Q119·PhysicsSingle correctJEE Main 2021

Statement-I : By doping silicon semiconductor with pentavalent material, the electrons density increases. Statement-II : The n-type semiconductor has net negative charge. In the light of the above statements, choose the most appropriate answer from the options given below :

(A)Statement-I is true but Statement-II is false.
(B)Statement-I is false but Statement-II is true.
(C)Both Statement-I and Statement-II are true.
(D)Both Statement-I and Statement-II are false.

Q120·PhysicsSingle correctJEE Main 2021

Four NOR gates are connected as shown in figure. The truth table for the given figure is :

(A)A B | Y 0 0 | 1 0 1 | 0 1 0 | 1 1 1 | 0
(B)A B | Y 0 0 | 0 0 1 | 1 1 0 | 1 1 1 | 0
(C)A B | Y 0 0 | 0 0 1 | 1 1 0 | 0 1 1 | 1
(D)A B | Y 0 0 | 1 0 1 | 0 1 0 | 0 1 1 | 1

Q121·PhysicsSingle correctJEE Main 2021

Identify the logic operation carried out by the given circuit :-

(A)OR
(B)AND
(C)NOR
(D)NAND

Q122·PhysicsNumericalJEE Main 2021

A transistor is connected in common emitter circuit configuration, then collector supply voltage is 10 V and the voltage drop across a resistor of 1000Ω in the collector is 0.6 V. If the current gain factor (β) is 24, then the base current is ____ μA. (Round off to the Nearest Integer)

Q123·PhysicsSingle correctJEE Main 2021

Find the truth table for the function Y of A and B represented in the following figure.

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q124·PhysicsNumericalJEE Main 2021

The amplitude of upper and lower side bands of A.M. wave where a carrier signal with frequency 11.21 MHz, peak voltage 15 V is amplitude modulate by a 7.7 kHz sine wave of 5 V amplitude are

\frac{a}{10}

V and

\frac{b}{10}

V respectively. Then the value of

\frac{a}{b}

is ____.

Q125·PhysicsNumericalJEE Main 2021

In a semiconductor, the number density of intrinsic charge carriers at 27°C is

1.5 \times 10^{16}

/ m³. If the semiconductor is doped with impurity atom, the hole density increases to

4.5 \times 10^{22}

/ m³. The electron density in the doped semiconductor is ________

\times 10^{9}

/ m³.

Q126·PhysicsSingle correctJEE Main 2021

Identify the logic operation carried out.

(A)OR
(B)NOR
(C)AND
(D)NAND

Q127·PhysicsSingle correctJEE Main 2021

In Amplitude Modulation, the message signal

V_m\left(t\right) = 10\sin\left(2\pi \times 10^5 t\right)

volts and carrier signal

V_c\left(t\right) = 20\sin\left(2\pi \times 10^7 t\right)

volts. The modulated signal now contains the message signal with lower side band and upper side band frequency, therefore the bandwidth of modulated signal is

\alpha

kHz. The value of

\alpha

is :

(A)200 kHz
(B)100 kHz
(C)0
(D)50 kHz

Q128·PhysicsSingle correctJEE Main 2021

Consider a situation in which reverse biased current of a particular

P-N

junction increase when it is exposed to a light of wavelength ≤ 621 nm. During this process, enhancement in carrier concentration takes place due to generation of hole

-

electron pairs. The value of band gap is nearly.

(A)1 eV
(B)4 eV
(C)0.5 eV
(D)2 eV

Q129·PhysicsSingle correctJEE Main 2021

What should be the height of transmitting antenna and the population covered if the television telecast is to cover a radius of 150 km? The average population density around the tower is 200 / km

^2

and the value of

R_e=6.5\times10^6

m.

(A)Height = 1800 m; Population Covered = $1413\times10^8$
(B)Height = 1241 m; Population Covered = $7\times10^5$
(C)Height = 1600 m; Population Covered = $2\times10^5$
(D)Height = 1731 m; Population Covered = $1413\times10^5$

Q130·PhysicsNumericalJEE Main 2021

In a given circuit diagram, a 5 V zener diode along with a series resistance is connected across a 50 V power supply. The minimum value of the resistance required, if the maximum zener current is 90 mA be ________ Ω.

Q131·PhysicsNumericalJEE Main 2021

For the forward biased diode characteristics shown in the figure, the dynamic resistance at

\mathrm{I}_{\mathrm{D}} = 3\,\mathrm{mA}

will be ___________

\Omega

.

Q132·PhysicsNumericalJEE Main 2021

A zener diode having zener voltage 8 V and power dissipation rating of 0.5 W is connected across a potential divider arranged with maximum potential drop across zener diode is as shown in the diagram. The value of protective resistance

\mathrm{R}_{\mathrm{p}}

is __________

\Omega

.

Q133·PhysicsSingle correctJEE Main 2021

For the circuit shown below, calculate the value of

I_2

:

(A)0.15 A
(B)0.1 A
(C)25 mA
(D)0.05 A

Q134·PhysicsNumericalJEE Main 2021

A carrier wave

V_C(t) = 160 \sin(2\pi \times 10^6 t)

volts is made to very between

V_{max} = 200

V and

V_{min} = 120

V by a message signal

V_m(t) = A_m \sin(2\pi \times 10^3 t)

volts. The peak voltage

A_m

of the modulating single is _________ V.

Q135·PhysicsNumericalJEE Main 2021

The typical output characteristics curve for a transistor working in the common-emitter configuration is shown in the figure. The estimated current gain from the figure is

Q136·PhysicsNumericalJEE Main 2021

An npn transistor operates as a common emitter amplifier with a power gain of 10

^{6}

. The input circuit resistance is 100Ω and the output load resistance is 10 KΩ. The common emitter current gain 'β' will be ______. (Round off to the Nearest Integer)

Q137·PhysicsSingle correctJEE Main 2021

The correct relation between α (ratio of collector current to emitter current) and β (ratio of collector current to base current) of a transistor is :

(A) $\beta=\frac{\alpha}{1+\alpha}$
(B) $\alpha=\frac{\beta}{1-\alpha}$
(C) $\beta=\frac{1}{1-\alpha}$
(D) $\alpha=\frac{\beta}{1+\beta}$

Q138·PhysicsSingle correctJEE Main 2021

Which one of the following will be the output of the given circuit ?

(A)NOR Gate
(B)NAND Gate
(C)AND Gate
(D)XOR Gate

Q139·PhysicsSingle correctJEE Main 2021

The output of the given combination gates represents :

(A)XOR Gate
(B)NAND Gate
(C)AND Gate
(D)NOR Gate

Q140·PhysicsNumericalJEE Main 2021

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 value of x is _______.

Q141·PhysicsNumericalJEE Main 2021

The value of power dissipated across the zener diode (V

_{z}

= 15 V) connected in the circuit as shown in the figure is x × 10

^{-1}

watt. The value of x, to the nearest integer, is ______.

Q142·PhysicsSingle correctJEE Main 2021

The following logic gate is equivalent to :

(A)NOR Gate
(B)OR Gate
(C)AND Gate
(D)NAND Gate

Q143·PhysicsSingle correctJEE Main 2021

LED is constructed from Ga-As-P semiconducting material. The energy gap of this LED is 1.9 eV. Calculate the wavelength of light emitted and its colour. [h=6.63×10

^{-34}

Js and c=3×10

^{8}

ms

^{-1}

]

(A)654 nm and red colour
(B)1046 nm and blue colour
(C)1046 nm and red colour
(D)654 nm and orange colour

Q144·PhysicsSingle correctJEE Main 2021

Draw the output Y in the given combination of gates.

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q145·PhysicsNumericalJEE Main 2021

The circuit contains two diodes each with a forward resistance of 50Ω and with infinite reverse resistance. If the battery voltage is 6 V, the current through the 120 Ω resistance is ___________ mA.

Q146·PhysicsNumericalJEE Main 2021

The zener diode has a

V_Z

= 30 V. The current passing through the diode for the following ciruit is ________________mA.

Q147·PhysicsSingle correctJEE Main 2021

A 5V battery is connected across the points X and Y. Assume

D_1

and

D_2

to be normal silicon diodes. Find the current supplied by the battery if the +ve terminal of the battery is connected to point X.

(A)~0.86 A
(B)~0.5 A
(C)~ 0.43 A
(D)~ 1.5 A

Q148·PhysicsSingle correctJEE Main 2021

Match List I with List II. List I List II (a) Rectifier (i) Used either for stepping up or stepping down the a.c. Voltage (b) Stabilizer (ii) Used to convert a.c. voltage into d.c. voltage (c) Transformer (iii) Used to remove any ripple in the rectified output voltage (d) Filter (iv) Used for constant output voltage even when the input voltage or load current change Choose the correct answer form the options given below:

(A)(a)-(ii), (b)- (i), (c)-(iv), (d)-(iii)
(B)(a)-(ii), (b)- (iv), (c)-(i), (d)-(iii)
(C)(a)-(ii), (b)- (i), (c)-(iii), (d)-(iv)
(D)(a)-(iii), (b)- (iv), (c)-(i), (d)-(ii)

Q149·PhysicsSingle correctJEE Main 2021

For extrinsic semiconductors: when doping level is increased;

(A)Fermi–level of p and n-type semiconductors will not be affected.
(B)Fermi–level of p-type semiconductors will go downward and Fermi–level of n-type semiconductor will go upward.
(C)Fermi–level of both p–type and n–type semiconductors will go upward for T > TF K and downward for T< TFK, where TF is Fermi temperature.
(D)Fermi–level of p-type semiconductor will go upward and Fermi–level of n–type semiconductors will go downward.

Q150·PhysicsSingle correctJEE Main 2021

Given below are two statements : Statement I : PN junction diodes can be used to function as transistor, simply by connecting two diodes, back to back, which acts as the base terminal. Statement II : In the study of transistor, the amplification factor

\beta

indicates ratio of the collector current to the base current. In the light of the above statements, choose the correct answer from the options given below.

(A)Statement I is false but Statement II is true.
(B)Both Statement I and Statement II are true
(C)Statement I is true but Statement II is false.
(D)Both Statement I and Statement II are false

Q151·PhysicsSingle correctJEE Main 2021

If an emitter current is changed by 4mA, the collector current changes by 3.5 mA.The value of

\beta

will be -

(A)7
(B)0.875
(C)0.5
(D)3.5

Q152·PhysicsSingle correctJEE Main 2021

The logic circuit shown above is equivalent to :

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q153·PhysicsNumericalJEE Main 2021

In connection with the circuit drawn below, the value of current flowing through 2k

\Omega

resistor is ________

\times 10^{-4}

A.

Q154·PhysicsSingle correctJEE Main 2021

Zener breakdown occurs in a p-n junction having p and n both :

(A)lightly doped and have wide depletion layer.
(B)heavily doped andhave narrow depletion layer.
(C)heavily doped and have wide depletion layer.
(D)lightly doped and have narrow depletion layer.

Q155·PhysicsNumericalJEE Main 2020

The out put characteristics of a transistor is shown in the figure. When

V_{CE}

is 10 V and

I_{C}

= 4.0 mA, then value of

\beta_{ac}

is ______.

Q156·PhysicsSingle correctJEE Main 2020

Take the breakdown voltage of the zener diode used in the given circuit as 6V. For the input voltage shown in figure below, the time variation of the output voltage is: (Graphs drawn are schematic and not to scale)

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q157·PhysicsSingle correctJEE Main 2020

Identify the operation performed by the circuit given below:

(A)AND
(B)NOT
(C)NAND
(D)OR

Q158·PhysicsSingle correctJEE Main 2020

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 a battery of emf 1.5 V is used in the circuit, the value of minimum resistance to be connected in series with the diode so that the current does not exceed the safe limit is

(A)100 Ω
(B)200 Ω
(C)50 Ω
(D)300 Ω

Q159·PhysicsSingle correctJEE Main 2020

If a semiconductor photodiode can detect a photon with a maximum wavelength of 400 nm, then its band gap energy is: Planck's constant

h = 6.63 \times 10^{-34}

J.s. Speed of light

c = 3 \times 10^{8}

m / s

(A)3.1eV
(B)1.5eV
(C)2.0eV
(D)1.1eV

Q160·PhysicsNumericalJEE Main 2020

Both the diodes used in the circuit shown are assumed to be ideal and have negligible resistance when these are forward biased. Built in potential in each diode is 0.7 V. For the input voltages shown in the figure, the voltage (in Volts) at point A is ____.

Q161·PhysicsSingle correctJEE Main 2020

Boolean relation at the output state-Y for the following circuits is:

(A) $\overline{A} \cdot \overline{B}$
(B)A + B
(C) $\overline{A} + \overline{B}$
(D)A · B

Q162·PhysicsSingle correctJEE Main 2020

In the given circuit, value of Y is

(A)0
(B)1
(C)toggles between 0 and 1
(D)will not execute

Q163·PhysicsSingle correctJEE Main 2020

Which of the following given a reversible operation?

(A)(A)
(B)(B)
(C)(C)
(D)(D)

Q164·PhysicsSingle correctJEE Main 2020

In the figure, potential difference between A and B is:

(A)5 V
(B)10 V
(C)zero
(D)15 V

Q165·PhysicsSingle correctJEE Main 2019

Figure shown a DC voltage regulator circuit, with a Zener diode of breakdown voltage = 6V. If the unregulated input voltage varies between 10 V to 16 V, then what is the maximum Zener current?

(A)2.5 mA
(B)3.5 mA
(C)7.5 mA
(D)1.5 mA

Q166·PhysicsSingle correctJEE Main 2019

The truth table for the circuit given in the fig is :

(A)A B Y: 0 0 1; 0 1 0; 1 0 0; 1 1 0
(B)A B Y: 0 0 0; 0 1 0; 1 0 1; 1 1 1
(C)A B Y: 0 0 1; 0 1 1; 1 0 1; 1 1 1
(D)A B Y: 0 0 1; 0 1 1; 1 0 0; 1 1 0

Q167·PhysicsSingle correctJEE Main 2019

The transfer characteristic curve of a transistor, having input and output resistance 100 Ω and 100 kΩ respectively, is shown in the figure. The Voltage and Power gain, are respectively :

(A) $5\times10^{4}$ , $2.5\times10^{6}$
(B) $5\times10^{4}$ , $5\times10^{6}$
(C) $5\times10^{4}$ , $5\times10^{5}$
(D) $2.5\times10^{4}$ , $2.5\times10^{6}$

Q168·PhysicsSingle correctJEE Main 2019

The figure represents a voltage regulator circuit using a Zener diode. The breakdown voltage of the Zener diode is 6 V and the load resistance is R

_L

= 4kΩ. The series resistance of the circuit is R

_i

= 1kΩ. If the battery voltage V

_8

varies from 8 V to 16 V, what are the minimum and maximum values of the current through Zener diode?

(A)0.5 mA; 0.6 mA
(B)1 mA; 8.5 mA
(C)1.5 mA; 8.5 mA
(D)0.5 mA; 8.5 mA

Q169·PhysicsSingle correctJEE Main 2019

An npn transistor operates as a common emitter amplifier, with a power gain of 60 dB. The input circuit resistance Is 100

\Omega

and the output load resistance is 10 k

\Omega

. the common emitter current gain

\beta

is:

(A) $6 \times 10^{2}$
(B) $10^{2}$
(C)60
(D) $10^{4}$

Q170·PhysicsSingle correctJEE Main 2019

The logic gate equivalent to the given logic circuit is:

(A)OR
(B)AND
(C)NOR
(D)NAND

Q171·PhysicsSingle correctJEE Main 2019

An NPN transistor is used in common emitter configuration as an amplifier with 1 kΩ load resistance. Signal voltage of 10 mV is applied across the base-emitter. This produces a 3 mA change in the collector current and 15 μA change in the base current of the amplifier. The input resistance and voltage gain are:

(A)0.67 kΩ, 300
(B)0.67 kΩ, 200
(C)0.33 kΩ, 1.5
(D)0.33 kΩ, 300

Q172·PhysicsSingle correctJEE Main 2019

A common emitter amplifier circuit, built using an npn transistor, is shown in the figure. Its dc current gain is 250,

R_C = 1k\Omega

and

V_{CC} = 10V

. What is the minimum base current for

V_{CE}

to reach saturation?

(A) $7\mu A$
(B) $40\mu A$
(C) $10\mu A$
(D) $100\mu A$

Q173·PhysicsSingle correctJEE Main 2019

The reverse breakdown voltage of a Zener diode is 5.6 V in the given circuit . The current

I_z

through the Zener is:

(A)10 mA
(B)15 mA
(C)7 mA
(D)17 mA

Q174·PhysicsSingle correctJEE Main 2019

In the figure, given that V

_{BB}

supply can vary from 0 to 5.0 V, V

_{CC}

= 5 V,

\beta_{dc}

= 200, R

_B

= 100, k

\Omega

, R

_C

= 1 k

\Omega

an V

_{BE}

= 1.0 V, The minimum base current and the input voltage at which the transistor will go to saturation, will be respectively :

(A)25 μA and 3.5 V
(B)20 μA and 3.5 V
(C)25 μA and 2.8 V
(D)20 μA and 2.8 V

Q175·PhysicsSingle correctJEE Main 2019

The output of the given logic circuit is:

(A) $A\bar{B}+\bar{A}B$
(B) $AB+\overline{AB}$
(C) $A\bar{B}$
(D) $\bar{A}B$

Q176·PhysicsSingle correctJEE Main 2019

In the given circuit the current through Zener Diode is close to:

(A)0.0 mA
(B)6.7 mA
(C)4.0 mA
(D)6.0 mA

Q177·PhysicsSingle correctJEE Main 2019

To get output '1' at R, for the given logic gate circuit the input values must be:

(A)X = 0, Y = 1
(B)X = 1, Y = 1
(C)X = 1, Y = 0
(D)X = 0, Y = 0

Q178·PhysicsSingle correctJEE Main 2019

Ge and Si diodes start conducting at 0.3 V and 0.7 V respectively. In the following figure if Ge diode connection are reversed, the value of

V_o

changes by: (assume that the Ge diode has large breakdown voltage)

(A)0.8 V
(B)0.6 V
(C)0.2 V
(D)0.4 V

Q179·PhysicsSingle correctJEE Main 2019

Mobility of electron in a semiconductor is defined as the ratio of their drift velocity to the applied electric field. If, for an n-type semiconductor, the density of electrons is

10^{19}

m

^{-3}

and their mobility is 1.6 m

^{2}

/(V.s) then the resistivity of the semiconductor(since it is an n-type semiconductor contribution of holes is ignored) is close to:

(A)2 $\Omega$ m
(B)4 $\Omega$ m
(C)0.4 $\Omega$ m
(D)0.2 $\Omega$ m

Electronic Devices — JEE Previous Year Questions

All 179 Electronic Devices questions

Electronic Devices — frequently asked

How many questions from Electronic Devices appear in JEE?

Is Electronic Devices an important chapter for JEE?

Where do these Electronic Devices questions come from?

Other Physics chapters

Practise Electronic Devices until it stops costing you marks.