MCQ (Single Correct Answer)

1

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

JEE Main 2025 (Online) 8th April Evening Shift Physics - Semiconductor Question 9 English
JEE Main 2025 (Online) 8th April Evening Shift
2

Consider the following logic circuit.

JEE Main 2025 (Online) 7th April Evening Shift Physics - Semiconductor Question 5 English

The output is Y = 0 when :

JEE Main 2025 (Online) 7th April Evening Shift
3

In the following circuit, the reading of the ammeter will be

$($ Take Zener breakdown voltage $=4 \mathrm{~V})$

JEE Main 2025 (Online) 7th April Morning Shift Physics - Semiconductor Question 6 English
JEE Main 2025 (Online) 7th April Morning Shift
4

Consider a n-type semiconductor in which $\mathrm{n}_{\mathrm{e}}$ and $\mathrm{n}_{\mathrm{h}}$ are number of electrons and holes, respectively.

(A) Holes are minority carriers

(B) The dopant is a pentavalent atom

(C) $\mathrm{n}_{\mathrm{e}} \mathrm{n}_{\mathrm{h}} \neq \mathrm{n}_i^2$

(where $\mathrm{n}_i$ is number of electrons or holes in semiconductor when it is intrinsic form)

(D) $\mathrm{n}_{\mathrm{e}} \mathrm{n}_{\mathrm{h}} \geqslant \mathrm{n}_i^2$

(E) The holes are not generated due to the donors

Choose the correct answer from the options given below :

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5

The Boolean expression $\mathrm{Y}=A \bar{B} C+\bar{A} \bar{C}$ 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, 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:

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6

$$ \text {The truth table corresponding to the circuit given below is: } $$

JEE Main 2025 (Online) 3rd April Evening Shift Physics - Semiconductor Question 1 English
JEE Main 2025 (Online) 3rd April Evening Shift
7

$$ \text { Choose the correct logic circuit for the given truth table having inputs } A \text { and } B \text {. } $$

Inputs Output
A B Y
0 0 0
0 1 0
1 0 1
1 1 1
JEE Main 2025 (Online) 3rd April Morning Shift
8

$$ \text { In the digital circuit shown in the figure, for the given inputs the } P \text { and } Q \text { values are : } $$

JEE Main 2025 (Online) 2nd April Evening Shift Physics - Semiconductor Question 7 English
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9

A zener diode with 5 V 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 $\left(I_L\right)$ and load resistance $\left(R_L\right)$ are :

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10

The truth table for the circuit given below is:

JEE Main 2025 (Online) 29th January Evening Shift Physics - Semiconductor Question 17 English
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11
JEE Main 2025 (Online) 29th January Morning Shift Physics - Semiconductor Question 18 English

For the circuit shown above, equivalent GATE is :

JEE Main 2025 (Online) 29th January Morning Shift
12

Which of the following circuits has the same output as that of the given circuit?

JEE Main 2025 (Online) 28th January Morning Shift Physics - Semiconductor Question 10 English

JEE Main 2025 (Online) 28th January Morning Shift
13

The output of the circuit is low (zero) for :

JEE Main 2025 (Online) 24th January Evening Shift Physics - Semiconductor Question 11 English

(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 :

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14

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 :

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15

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

JEE Main 2025 (Online) 23rd January Evening Shift Physics - Semiconductor Question 13 English

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16

Refer to the circuit diagram given in the figure. which of the following observations are correct?

A. Total resistance of circuit is $6 \Omega$

B. Current in Ammeter is 1 A

C. Potential across $A B$ is 4 Volts.

D. Potential across CD is 4 Volts

E. Total resistance of the circuit is $8 \Omega$.

Choose the correct answer from the options given below:

JEE Main 2025 (Online) 23rd January Morning Shift Physics - Semiconductor Question 14 English

JEE Main 2025 (Online) 23rd January Morning Shift
17

JEE Main 2025 (Online) 22nd January Evening Shift Physics - Semiconductor Question 15 English

To obtain the given truth table, following logic gate should be placed at G :

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18

Which of the following circuits represents a forward biased diode?

JEE Main 2025 (Online) 22nd January Morning Shift Physics - Semiconductor Question 16 English

Choose the correct answer from the options given below:

JEE Main 2025 (Online) 22nd January Morning Shift
19

JEE Main 2024 (Online) 9th April Evening Shift Physics - Semiconductor Question 29 English

In the truth table of the above circuit the value of X and Y are :

JEE Main 2024 (Online) 9th April Evening Shift
20

The $$I$$-$$V$$ characteristics of an electronic device shown in the figure. The device is :

JEE Main 2024 (Online) 9th April Evening Shift Physics - Semiconductor Question 30 English

JEE Main 2024 (Online) 9th April Evening Shift
21

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

JEE Main 2024 (Online) 9th April Morning Shift
22

The output $$\mathrm{Y}$$ of following circuit for given inputs is :

JEE Main 2024 (Online) 8th April Morning Shift Physics - Semiconductor Question 23 English

JEE Main 2024 (Online) 8th April Morning Shift
23

The acceptor level of a p-type semiconductor is $$6 \mathrm{~eV}$$. The maximum wavelength of light which can create a hole would be : Given $$\mathrm{hc}=1242 \mathrm{~eV} \mathrm{~nm}$$.

JEE Main 2024 (Online) 6th April Evening Shift
24

The correct truth table for the following logic circuit is :

JEE Main 2024 (Online) 6th April Morning Shift Physics - Semiconductor Question 19 English

JEE Main 2024 (Online) 6th April Morning Shift
25

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

JEE Main 2024 (Online) 5th April Evening Shift Physics - Semiconductor Question 21 English

JEE Main 2024 (Online) 5th April Evening Shift
26

Following gates section is connected in a complete suitable circuit.

JEE Main 2024 (Online) 5th April Morning Shift Physics - Semiconductor Question 22 English

For which of the following combination, bulb will glow (ON) :

JEE Main 2024 (Online) 5th April Morning Shift
27

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

JEE Main 2024 (Online) 4th April Evening Shift
28

Identify the logic gate given in the circuit :

JEE Main 2024 (Online) 4th April Evening Shift Physics - Semiconductor Question 25 English

JEE Main 2024 (Online) 4th April Evening Shift
29

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

JEE Main 2024 (Online) 4th April Morning Shift Physics - Semiconductor Question 27 English

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30
To measure the temperature coefficient of resistivity $\alpha$ of a semiconductor, an electrical arrangement shown in the figure is prepared. The arm BC is made up of the semiconductor. The experiment is being conducted at $25^{\circ} \mathrm{C}$ and resistance of the semiconductor arm is $3 \mathrm{~m} \Omega$. Arm $\mathrm{BC}$ is cooled at a constant rate of $2^{\circ} \mathrm{C} / \mathrm{s}$. If the galvanometer $\mathrm{G}$ shows no deflection after $10 \mathrm{~s}$, then $\alpha$ is :

JEE Main 2024 (Online) 1st February Evening Shift Physics - Semiconductor Question 40 English
JEE Main 2024 (Online) 1st February Evening Shift
31
In the given circuit if the power rating of Zener diode is $10 \mathrm{~mW}$, the value of series resistance $R_s$ to regulate the input unregulated supply is :

JEE Main 2024 (Online) 1st February Morning Shift Physics - Semiconductor Question 39 English
JEE Main 2024 (Online) 1st February Morning Shift
32

JEE Main 2024 (Online) 31st January Evening Shift Physics - Semiconductor Question 36 English

The output of the given circuit diagram is -

JEE Main 2024 (Online) 31st January Evening Shift
33

Identify the logic operation performed by the given circuit.

JEE Main 2024 (Online) 31st January Morning Shift Physics - Semiconductor Question 35 English

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34

JEE Main 2024 (Online) 30th January Evening Shift Physics - Semiconductor Question 32 English

In the given circuit, the voltage across load resistance (R$$_L$$) is :

JEE Main 2024 (Online) 30th January Evening Shift
35

A Zener diode of breakdown voltage $$10 \mathrm{~V}$$ is used as a voltage regulator as shown in the figure. The current through the Zener diode is :

JEE Main 2024 (Online) 30th January Morning Shift Physics - Semiconductor Question 31 English

JEE Main 2024 (Online) 30th January Morning Shift
36

The truth table for this given circuit is :

JEE Main 2024 (Online) 29th January Evening Shift Physics - Semiconductor Question 33 English

JEE Main 2024 (Online) 29th January Evening Shift
37

In the given circuit, the breakdown voltage of the Zener diode is $$3.0 \mathrm{~V}$$. What is the value of $$\mathrm{I}_{\mathrm{z}}$$ ?

JEE Main 2024 (Online) 29th January Morning Shift Physics - Semiconductor Question 34 English

JEE Main 2024 (Online) 29th January Morning Shift
38

The truth table of the given circuit diagram is :

JEE Main 2024 (Online) 27th January Evening Shift Physics - Semiconductor Question 37 English

JEE Main 2024 (Online) 27th January Evening Shift
39

Which of the following circuits is reverse - biased?

JEE Main 2024 (Online) 27th January Morning Shift
40
In the given circuit, the current (I) through the battery will be

JEE Main 2023 (Online) 15th April Morning Shift Physics - Semiconductor Question 54 English
JEE Main 2023 (Online) 15th April Morning Shift
41

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

JEE Main 2023 (Online) 13th April Evening Shift Physics - Semiconductor Question 53 English

JEE Main 2023 (Online) 13th April Evening Shift
42

For the following circuit and given inputs A and B, choose the correct option for output '$$Y$$'

JEE Main 2023 (Online) 13th April Morning Shift Physics - Semiconductor Question 51 English

JEE Main 2023 (Online) 13th April Morning Shift
43

In an n-p-n common emitter (CE) transistor the collector current changes from 5 $$\mathrm{mA}$$ to $$16 \mathrm{~mA}$$ for the change in base current from $$100~ \mu \mathrm{A}$$ and $$200 ~\mu \mathrm{A}$$, respectively. The current gain of transistor is __________.

JEE Main 2023 (Online) 12th April Morning Shift
44

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

JEE Main 2023 (Online) 11th April Evening Shift Physics - Semiconductor Question 49 English

JEE Main 2023 (Online) 11th April Evening Shift
45

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

JEE Main 2023 (Online) 11th April Morning Shift Physics - Semiconductor Question 48 English

JEE Main 2023 (Online) 11th April Morning Shift
46

If each diode has a forward bias resistance of $$25 ~\Omega$$ in the below circuit,

JEE Main 2023 (Online) 10th April Evening Shift Physics - Semiconductor Question 47 English

Which of the following options is correct :

JEE Main 2023 (Online) 10th April Evening Shift
47

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 3 V and 10 V. The value of resistance Rs for safe operation of diode will be

JEE Main 2023 (Online) 10th April Morning Shift Physics - Semiconductor Question 46 English

JEE Main 2023 (Online) 10th April Morning Shift
48

For a given transistor amplifier circuit in $$\mathrm{CE}$$ configuration $$\mathrm{V}_{\mathrm{CC}}=1 \mathrm{~V}, \mathrm{R}_{\mathrm{C}}=1 ~\mathrm{k} \Omega, \mathrm{R}_{\mathrm{b}}=100 ~\mathrm{k} \Omega$$ and $$\beta=100$$. Value of base current $$\mathrm{I}_{\mathrm{b}}$$ is

JEE Main 2023 (Online) 8th April Evening Shift Physics - Semiconductor Question 45 English

JEE Main 2023 (Online) 8th April Evening Shift
49

For the logic circuit shown, the output waveform at $$\mathrm{Y}$$ is:

JEE Main 2023 (Online) 8th April Morning Shift Physics - Semiconductor Question 44 English

JEE Main 2023 (Online) 8th April Morning Shift
50

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 $$\mathrm{n}$$-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

JEE Main 2023 (Online) 6th April Evening Shift
51

Name the logic gate equivalent to the diagram attached

JEE Main 2023 (Online) 6th April Morning Shift Physics - Semiconductor Question 43 English

JEE Main 2023 (Online) 6th April Morning Shift
52

The resistivity $$(\rho)$$ of semiconductor varies with temperature. Which of the following curve represents the correct behaviour :

JEE Main 2023 (Online) 6th April Morning Shift
53

Choose the correct statement about Zener diode :

JEE Main 2023 (Online) 1st February Evening Shift
54

Match List I with List II:

List I List II
A. Intrinsic semiconductor I. Fermi-level near the valence bond
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

Choose the correct answer from the options given below :

JEE Main 2023 (Online) 1st February Morning Shift
55

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.

JEE Main 2023 (Online) 31st January Evening Shift
56

The effect of increase in temperature on the number of electrons in conduction band ($$\mathrm{n_e}$$) and resistance of a semiconductor will be as:

JEE Main 2023 (Online) 31st January Morning Shift
57

The output $Y$ for the inputs $A$ and $B$ of circuit is given by

JEE Main 2023 (Online) 30th January Evening Shift Physics - Semiconductor Question 62 English

Truth table of the shown circuit is:

JEE Main 2023 (Online) 30th January Evening Shift
58

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

JEE Main 2023 (Online) 30th January Morning Shift Physics - Semiconductor Question 61 English

JEE Main 2023 (Online) 30th January Morning Shift
59

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

JEE Main 2023 (Online) 29th January Evening Shift Physics - Semiconductor Question 60 English

JEE Main 2023 (Online) 29th January Evening Shift
60

Which one of the following statement 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:

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61

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 ameter.

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

JEE Main 2023 (Online) 25th January Evening Shift
62

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 $$\mathrm{|{V_z}| > \pm v \ge |{v_0}|}$$ where $$\mathrm{v_0}$$ is the threshold voltage and $$\mathrm{V_z}$$ is the breakdown voltage.

In the light of the above statements, choose the correct answer from the options given below

JEE Main 2023 (Online) 25th January Morning Shift
63

JEE Main 2023 (Online) 24th January Evening Shift Physics - Semiconductor Question 56 English

The logic gate equivalent to the given circuit diagram is :

JEE Main 2023 (Online) 24th January Evening Shift
64

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R

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 :

JEE Main 2023 (Online) 24th January Morning Shift
65

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

JEE Main 2022 (Online) 28th July Evening Shift Physics - Semiconductor Question 69 English

JEE Main 2022 (Online) 28th July Evening Shift
66

Identify the solar cell characteristics from the following options :

JEE Main 2022 (Online) 28th July Morning Shift
67

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

JEE Main 2022 (Online) 27th July Evening Shift
68

A logic gate circuit has two inputs A and B and output Y. The voltage waveforms of A, B and Y are shown below.

JEE Main 2022 (Online) 27th July Morning Shift Physics - Semiconductor Question 72 English

The logic gate circuit is :

JEE Main 2022 (Online) 27th July Morning Shift
69

In the circuit, the logical value of $$A=1$$ or $$B=1$$ when potential at $$A$$ or $$B$$ is $$5 \mathrm{~V}$$ and the logical value of $$A=0$$ or $$B=0$$ when potential at $$A$$ or $$B$$ is $$0 \mathrm{~V}$$.

JEE Main 2022 (Online) 25th July Morning Shift Physics - Semiconductor Question 77 English

The truth table of the given circuit will be :

JEE Main 2022 (Online) 25th July Morning Shift
70

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 0.6 V. Which of the following output voltage (V0) waveform across the diode is correct?

JEE Main 2022 (Online) 28th June Evening Shift Physics - Semiconductor Question 94 English

JEE Main 2022 (Online) 28th June Evening Shift
71

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 Physics - Semiconductor Question 90 English

JEE Main 2022 (Online) 28th June Morning Shift
72

For using a multimeter to identify diode from electrical components, choose the correct statement out of the following about the diode :

JEE Main 2022 (Online) 28th June Morning Shift
73

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 :

JEE Main 2022 (Online) 28th June Morning Shift
74

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

JEE Main 2022 (Online) 27th June Evening Shift
75

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

JEE Main 2022 (Online) 27th June Morning Shift Physics - Semiconductor Question 87 English

JEE Main 2022 (Online) 27th June Morning Shift
76

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

JEE Main 2022 (Online) 26th June Evening Shift
77

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 voltage of 2 V and 4 V respectively, is :

JEE Main 2022 (Online) 26th June Morning Shift Physics - Semiconductor Question 84 English

JEE Main 2022 (Online) 26th June Morning Shift
78

Identify the logic operation performed by the given circuit:

JEE Main 2022 (Online) 25th June Evening Shift Physics - Semiconductor Question 83 English

JEE Main 2022 (Online) 25th June Evening Shift
79

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

JEE Main 2022 (Online) 25th June Morning Shift
80
In the given figure, each diode has a forward bias resistance of 30$$\Omega$$ and infinite resistance in reverse bias. The current I1 will be :

JEE Main 2021 (Online) 1st September Evening Shift Physics - Semiconductor Question 97 English
JEE Main 2021 (Online) 1st September Evening Shift
81
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 following circuit (A) and (B) are :-

JEE Main 2021 (Online) 31st August Evening Shift Physics - Semiconductor Question 99 English
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82
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 RL.

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 RL.

In the light of the above statements, choose the most appropriate answer from the options given below :
JEE Main 2021 (Online) 31st August Evening Shift
83
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 :

JEE Main 2021 (Online) 31st August Morning Shift Physics - Semiconductor Question 101 English
JEE Main 2021 (Online) 31st August Morning Shift
84
Choose the correct waveform that can represent the voltage across R of the following circuit, assuming the diode is ideal one :

JEE Main 2021 (Online) 31st August Morning Shift Physics - Semiconductor Question 100 English
JEE Main 2021 (Online) 31st August Morning Shift
85
For a transistor $$\alpha$$ and $$\beta$$ are given as $$\alpha = {{{I_C}} \over {{I_E}}}$$ and $$\beta = {{{I_C}} \over {{I_B}}}$$. Then the correct relation between $$\alpha$$ and $$\beta$$ will be :
JEE Main 2021 (Online) 27th August Evening Shift
86
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
87
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 Physics - Semiconductor Question 107 English
JEE Main 2021 (Online) 26th August Evening Shift
88
Identify the logic operation carried out by the given circuit :-

JEE Main 2021 (Online) 26th August Morning Shift Physics - Semiconductor Question 108 English
JEE Main 2021 (Online) 26th August Morning Shift
89
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 :
JEE Main 2021 (Online) 26th August Morning Shift
90
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 Physics - Semiconductor Question 110 English
JEE Main 2021 (Online) 27th July Evening Shift
91
Identify the logic operation carried out.

JEE Main 2021 (Online) 25th July Morning Shift Physics - Semiconductor Question 113 English
JEE Main 2021 (Online) 25th July Morning Shift
92
Consider a situation in which reserve biased current of a particular P-N junction increases when it is exposed to a light of wavelength $$\le$$ 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.
JEE Main 2021 (Online) 22th July Evening Shift
93
For the circuit shown below, calculate the value of Iz :

JEE Main 2021 (Online) 20th July Morning Shift Physics - Semiconductor Question 118 English
JEE Main 2021 (Online) 20th July Morning Shift
94
The correct relation between $$\alpha$$ (ratio of collector current to emitter current) and $$\beta$$ (ratio of collector current to base current) of a transistor is :
JEE Main 2021 (Online) 18th March Evening Shift
95
Which one of the following will be the output of the given circuit?

JEE Main 2021 (Online) 17th March Evening Shift Physics - Semiconductor Question 122 English
JEE Main 2021 (Online) 17th March Evening Shift
96
The output of the given combination gates represents :

JEE Main 2021 (Online) 17th March Morning Shift Physics - Semiconductor Question 123 English
JEE Main 2021 (Online) 17th March Morning Shift
97
The following logic gate is equivalent to :

JEE Main 2021 (Online) 16th March Evening Shift Physics - Semiconductor Question 124 English
JEE Main 2021 (Online) 16th March Evening Shift
98
Draw the output signal Y in the given combination of gates.

JEE Main 2021 (Online) 26th February Evening Shift Physics - Semiconductor Question 128 English
JEE Main 2021 (Online) 26th February Evening Shift
99
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 $$\times$$ 10$$-$$34 Js and c = 3 $$\times$$ 108 ms$$-$$1]
JEE Main 2021 (Online) 26th February Morning Shift
100
For extrinsic semiconductors; when doping level is increased;
JEE Main 2021 (Online) 25th February Evening Shift
101
The truth table for the following logic circuit is :

JEE Main 2021 (Online) 25th February Evening Shift Physics - Semiconductor Question 131 English
JEE Main 2021 (Online) 25th February Evening Shift
102
A 5V battery is connected across the points X and Y. Assume D1 and D2 to be normal silicon diodes. Find the current supplied by the battery if the +ve terminal of the battery is connected to point X.

JEE Main 2021 (Online) 25th February Morning Shift Physics - Semiconductor Question 133 English
JEE Main 2021 (Online) 25th February Morning Shift
103
JEE Main 2021 (Online) 24th February Evening Shift Physics - Semiconductor Question 136 English
The logic circuit shown above is equivalent to :
JEE Main 2021 (Online) 24th February Evening Shift
104
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.
JEE Main 2021 (Online) 24th February Evening Shift
105
Zener breakdown occurs in a p $$-$$ n junction having p and n both :
JEE Main 2021 (Online) 24th February Evening Shift
106
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 Shift
107
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 Physics - Semiconductor Question 140 English
JEE Main 2020 (Online) 6th September Morning Slot
108
Two Zener diodes (A and B) having breakdown voltages of 6 V and 4 V respectively, are connected as shown in the circuit below. The output voltage V0 variation with input voltage linearly increasing with time, is given by :
(Vinput = 0 V at t = 0)
(figures are qualitative) JEE Main 2020 (Online) 5th September Evening Slot Physics - Semiconductor Question 141 English
JEE Main 2020 (Online) 5th September Evening Slot
109
With increasing biasing voltage of a photodiode, the photocurrent magnitude :
JEE Main 2020 (Online) 5th September Morning Slot
110
Identify the operation performed by the circuit given below : JEE Main 2020 (Online) 4th September Evening Slot Physics - Semiconductor Question 143 English
JEE Main 2020 (Online) 4th September Evening Slot
111
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) JEE Main 2020 (Online) 4th September Morning Slot Physics - Semiconductor Question 148 English
JEE Main 2020 (Online) 4th September Morning Slot
112
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 $$ \times $$ 108 m/s
JEE Main 2020 (Online) 3rd September Evening Slot
113
Which of the following will NOT be observed when a multimeter (operating in resistance measuring mode) probes connected across a component, are just reversed?
JEE Main 2020 (Online) 3rd September Evening Slot
114
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
JEE Main 2020 (Online) 3rd September Morning Slot
115
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, 1) JEE Main 2020 (Online) 2nd September Evening Slot Physics - Semiconductor Question 147 English
JEE Main 2020 (Online) 2nd September Evening Slot
116
The current i in the network is : JEE Main 2020 (Online) 9th January Evening Slot Physics - Semiconductor Question 151 English
JEE Main 2020 (Online) 9th January Evening Slot
117
Two identical capacitors A and B, charged to the same potential 5V are connected in two different circuits as shown below at time t = 0. If the charge on capacitors A and B at time t = CR is QA and QB respectively, then (Here e is the base of natural logarithm) JEE Main 2020 (Online) 9th January Evening Slot Physics - Semiconductor Question 150 English
JEE Main 2020 (Online) 9th January Evening Slot
118
In the given circuit, value of Y is : JEE Main 2020 (Online) 8th January Evening Slot Physics - Semiconductor Question 153 English
JEE Main 2020 (Online) 8th January Evening Slot
119
Boolean relation at the output stage-Y for the following circuit is : JEE Main 2020 (Online) 8th January Morning Slot Physics - Semiconductor Question 154 English
JEE Main 2020 (Online) 8th January Morning Slot
120
In the figure, potential difference between A and B is : JEE Main 2020 (Online) 7th January Evening Slot Physics - Semiconductor Question 155 English
JEE Main 2020 (Online) 7th January Evening Slot
121
Which of the following gives a reversible operation?
JEE Main 2020 (Online) 7th January Morning Slot
122
Figure shows 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 maximum Zener current? JEE Main 2019 (Online) 12th April Evening Slot Physics - Semiconductor Question 157 English
JEE Main 2019 (Online) 12th April Evening Slot
123
The transfer characteristic curve of a transistor, having input and output resistance 100 $$\Omega $$ and 100 k$$\Omega $$ respectively is shown in the figure. The voltage and power gain, are respectively: JEE Main 2019 (Online) 12th April Morning Slot Physics - Semiconductor Question 158 English
JEE Main 2019 (Online) 12th April Morning Slot
124
The truth table for the circuit given in the fig. is: JEE Main 2019 (Online) 12th April Morning Slot Physics - Semiconductor Question 159 English
JEE Main 2019 (Online) 12th April Morning Slot
125
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, RL = 4k$$\Omega $$. The series resistance of the circuit is Ri = 1 k$$\Omega $$. If the battery voltage VB varies from 8 V to 16 V, what are the minimum and maximum values of the current through Zener diode? JEE Main 2019 (Online) 10th April Evening Slot Physics - Semiconductor Question 160 English
JEE Main 2019 (Online) 10th April Evening Slot
126
An n-p-n 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 :
JEE Main 2019 (Online) 10th April Morning Slot
127
The logic gate equivalent to the given logic circuit is :- JEE Main 2019 (Online) 9th April Evening Slot Physics - Semiconductor Question 162 English
JEE Main 2019 (Online) 9th April Evening Slot
128
An NPN transistor is used in common emitter configuration as an amplifier with 1 k$$\Omega $$ load resistance. Signal voltage of 10 mV is applied across the base-emitter. This produces a 3 mA change in the collector current and 15μA change in the base current of the amplifier. The input resistance and voltage gain are :
JEE Main 2019 (Online) 9th April Morning Slot
129
A common emitter amplifier circuit, built using an npn transistor, is shown in the figure. Its dc current gain is 250, RC = 1k$$\Omega$$ and VCC = 10 V. What is the minimum base current for VCE to reach saturation ? JEE Main 2019 (Online) 8th April Evening Slot Physics - Semiconductor Question 164 English
JEE Main 2019 (Online) 8th April Evening Slot
130
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 Physics - Semiconductor Question 165 English
JEE Main 2019 (Online) 8th April Morning Slot
131
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 = 1 k$$\Omega $$ and VBE = 1.0 V. The minimum base current and the input voltage at which the transistor will go to saturation, will be respectively :

JEE Main 2019 (Online) 12th January Evening Slot Physics - Semiconductor Question 166 English
JEE Main 2019 (Online) 12th January Evening Slot
132
The output of the given logic circuit is :

JEE Main 2019 (Online) 12th January Morning Slot Physics - Semiconductor Question 167 English
JEE Main 2019 (Online) 12th January Morning Slot
133
The circuit shown below contains two ideal diodes, each with a forward resistance of 50 $$\Omega $$. If the battery voltage is 6 V, the current through the 100 $$\Omega $$ resistance (in Amperes) is :

JEE Main 2019 (Online) 11th January Evening Slot Physics - Semiconductor Question 168 English
JEE Main 2019 (Online) 11th January Evening Slot
134
In the given circuit the current through Zener Diode is close to:

JEE Main 2019 (Online) 11th January Morning Slot Physics - Semiconductor Question 169 English
JEE Main 2019 (Online) 11th January Morning Slot
135
For the circuit shown below, the current through the Zener diode is -

JEE Main 2019 (Online) 10th January Evening Slot Physics - Semiconductor Question 170 English
JEE Main 2019 (Online) 10th January Evening Slot
136
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 Physics - Semiconductor Question 171 English
JEE Main 2019 (Online) 10th January Morning Slot
137
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 V0 changes by : (assume that the Ge diode has large breakdown voltage)

JEE Main 2019 (Online) 9th January Evening Slot Physics - Semiconductor Question 172 English
JEE Main 2019 (Online) 9th January Evening Slot
138
Mobility of electrons 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 1019 m$$-$$3 and their mobility is 1.6 m2/(V.s) then the resistivity of the semiconductor (since it is an n-type semiconductor contribution of holes is ignored) is close to :
JEE Main 2019 (Online) 9th January Morning Slot
139
In the given circuit, the current through zener diode is :

JEE Main 2018 (Online) 16th April Morning Slot Physics - Semiconductor Question 183 English
JEE Main 2018 (Online) 16th April Morning Slot
140
The reading of the ammeter for a silicon diode in the given circuit is : JEE Main 2018 (Offline) Physics - Semiconductor Question 187 English
JEE Main 2018 (Offline)
141
Truth table for the following digital circuit will be :
JEE Main 2018 (Online) 15th April Evening Slot Physics - Semiconductor Question 184 English
JEE Main 2018 (Online) 15th April Evening Slot
142
In a common emitter configuration with suitable bias, it is given that $${R_L}$$ is the load resistance and $${R_{BE}}$$ is small signal dynamic resistance (input side). Then, voltage gain, current gain and power gain are given, respectively, by :

$$\beta $$ is curret gain, $${{\rm I}_B},{{\rm I}_C}$$ and $${{\rm I}_E}$$ are respectively base, collector and emitter currents.
JEE Main 2018 (Online) 15th April Morning Slot
143
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
144
What is the conductivity of a semiconductor sale having electron concentration of $$5 \times {10^{18}}\,\,{m^{ - 3}},$$ hole concentration of $$5 \times {10^{19}}\,\,{m^{ - 3}},$$ electron mobility of 2.0 m2 V$$-$$1 s-1 and hole mobility of 0.01 m2 V$$-$$1 s$$-$$1 ?

(Take charge of electronas 1.6 $$ \times $$ 10 $$-$$19 c)
JEE Main 2017 (Online) 8th April Morning Slot
145
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 Physics - Semiconductor Question 181 English
JEE Main 2017 (Online) 8th April Morning Slot
146
In a common emitter amplifier circuit using an n-p-n transistor, the phase difference between the input and the output voltages will be:
JEE Main 2017 (Offline)
147
To get an output of 1 from the circuit shown in figure the input must be :

JEE Main 2016 (Online) 10th April Morning Slot Physics - Semiconductor Question 175 English
JEE Main 2016 (Online) 10th April Morning Slot
148
A realistic graph depicting the variation of the reciprocal of input resistance in an input characteristics measurement in a commonemitter transistor configuration is :
JEE Main 2016 (Online) 10th April Morning Slot
149
The ratio (R) of output resistance r0, and the input resistance ri in measurements of input and output characteristics of a transistor is typically in the range:
JEE Main 2016 (Online) 10th April Morning Slot
150
An experiment is performed to determine the I - V characteristics of a Zener diode, which has a protective resistance of R = 100 $$\Omega $$, and a maximum power of dissipation rating of 1 W. The minimum voltage range of the DC source in the circuit is :
JEE Main 2016 (Online) 9th April Morning Slot
151
An unknown transistor needs to be identified as a npn or pnp type. A multimeter, with + ve and − ve terminals, is used to measure resistance between different terminals of transistor. If terminal 2 is the base of the transistor then which of the following is correct for a pnp transistor ?
JEE Main 2016 (Online) 9th April Morning Slot
152
The truth table given in fig. represents :
A B Y
0 0 0
0 1 1
1 0 1
1 1 1
JEE Main 2016 (Online) 9th April Morning Slot
153
The temperature dependence of resistance of $$Cu$$ and undoped $$Si$$ in the temperature range $$300-400$$ $$K,$$ is best described by :
JEE Main 2016 (Offline)
154
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) Physics - Semiconductor Question 190 English
JEE Main 2016 (Offline)
155
Identify the semiconductor devices whose characteristics are given below, in the order $$(a), (b), (c), (d)$$ :

JEE Main 2016 (Offline) Physics - Semiconductor Question 189 English
JEE Main 2016 (Offline)
156
A red $$LED$$ emits light at $$0.1$$ watt uniformly around it. The amplitude of the electric field of the light at a distance of $$1$$ $$m$$ from the diode is :
JEE Main 2015 (Offline)
157
The current voltage relation of diode is given by $${\rm I} = \left( {{e^{100V/T}} - 1} \right)mA,$$ where the applied voltage $$V$$ is in volts and the temperature $$T$$ is in degree kelvin. If a student makes an error measuring $$ \pm 0.01\,V$$ while measuring the current of $$5$$ $$mA$$ at $$300$$ $$K,$$ what will be the error in the value of current on $$mA$$?
JEE Main 2014 (Offline)
158
The forward biased diode connection is:
JEE Main 2014 (Offline)
159
The $${\rm I}$$-$$V$$ characteristic of an $$LED$$ is
JEE Main 2013 (Offline)
160
A diode detector is used to detect an amplitude modulated wave of $$60\% $$ modulation by using a condenser of capacity $$250$$ picofarad in parallel with a load resistance $$100$$ kilo $$ohm.$$ Find the maximum modulated frequency which could be detected by it. JEE Main 2013 (Offline) Physics - Semiconductor Question 205 English
JEE Main 2013 (Offline)
161
Truth table for system of four $$NAND$$ gates as shown in figure is: AIEEE 2012 Physics - Semiconductor Question 192 English
AIEEE 2012
162
The combination of gates shown below yields AIEEE 2010 Physics - Semiconductor Question 193 English
AIEEE 2010
163
A $$p$$-$$n$$ junction $$(D)$$ shown in the figure can act as a rectifier. An alternating current source $$(V)$$ is connected in the circuit. AIEEE 2009 Physics - Semiconductor Question 194 English

The current $$(I)$$ in the resistor $$(R)$$ can be shown by :

AIEEE 2009
164
The logic circuit shown below has the input waveforms $$'A'$$ and $$'B'$$ as shown. Pick out the correct output waveform. AIEEE 2009 Physics - Semiconductor Question 195 English 1 AIEEE 2009 Physics - Semiconductor Question 195 English 2

Output is

AIEEE 2009
165
A working transistor with its three legs marked $$P,Q$$ and $$R$$ is tested using a multi-meter. No conduction is found between $$P$$ and $$Q$$. By connecting the common (negative) terminal of the multi-meter to $$R$$ and the other (positive) terminal to $$P$$ or $$Q,$$ some resistance is seen on the multi-meter. Which of the following is true for the transistor?
AIEEE 2008
166
In the circuit below, $$A$$ and $$B$$ represent two inputs and $$C$$ represents the output. AIEEE 2008 Physics - Semiconductor Question 196 English

The circuit represents

AIEEE 2008
167
Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statements is most appropriate ?
AIEEE 2007
168
If in a $$p$$-$$n$$ junction diode, a square input signal of $$10$$ $$V$$ is applied as shown AIEEE 2007 Physics - Semiconductor Question 197 English

Then the output signal across $${R_L}$$ will be

AIEEE 2007
169
In a common base mode of a transistor, the collector current is $$5.488$$ $$mA$$ for an emitter current of $$5.60mA.$$ The value of the base current amplification factor $$\left( \beta \right)$$ will be
AIEEE 2006
170
If the lattice constant of this semiconductor is decreased, then which of the following is correct? AIEEE 2006 Physics - Semiconductor Question 198 English
AIEEE 2006
171
In the following, which one of the diodes is reverse biased?
AIEEE 2006
172
The circuit has two oppositively connected ideal diodes in parallel. What is the current following in the circuit?

AIEEE 2006 Physics - Semiconductor Question 200 English
AIEEE 2006
173
A solid which is not transparent to visible light and whose conductivity increases with temperature is formed by
AIEEE 2006
174
If the ratio of the concentration of electrons to that of holes in a semiconductor is $${7 \over 5}$$ and the ratio of currents is $${7 \over 4},$$ then what is the ratio of their drift velocities?
AIEEE 2006
175
The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than $$2480$$ $$nm$$ is incident on it. The band gap in $$(eV)$$ for the semiconductor is
AIEEE 2005
176
In a full wave rectifier circuit operating from $$50$$ $$Hz$$ mains frequency, the fundamental frequency in the ripple would be
AIEEE 2005
177
In a common base amplifier, the phase difference between the input signal voltage and output voltage is
AIEEE 2005
178
For a transistor amplifier in common emitter configuration for load impedance of $$1k\,\Omega $$ $$\left( {{h_{fe}} = 50} \right.$$ and $$\left. {{h_{oe}} = 25} \right)$$ the current gain is
AIEEE 2004
179
When $$p$$-$$n$$ junction diode is forward biased then
AIEEE 2004
180
The manifestation of band structure in solids is due to
AIEEE 2004
181
A piece of copper and another of germanium are cooled from room temperature to $$77K,$$ the resistance of
AIEEE 2004
182
When $$npn$$ transistor is used as an amplifer
AIEEE 2004
183
A strip of copper and another of germanium are cooled from room temperature to $$80K.$$ The resistance of
AIEEE 2003
184
The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the
AIEEE 2003
185
In the middle of the depletion layer of a reverse- biased $$p$$-$$n$$ junction, the
AIEEE 2003
186
At absolute zero, Si acts as
AIEEE 2002
187
By increasing the temperature, the specific resistance of a conductor and a semiconductor
AIEEE 2002
188
The energy band gap is maximum in
AIEEE 2002
189
The part of a transistor which is most heavily doped to produce large number of majority carriers is
AIEEE 2002

Numerical

1

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

JEE Main 2024 (Online) 8th April Evening Shift Physics - Semiconductor Question 24 English

JEE Main 2024 (Online) 8th April Evening Shift
2

From the given transfer characteristic of a transistor in $$\mathrm{CE}$$ configuration, the value of power gain of this configuration is $$10^{x}$$, for $$\mathrm{R}_{\mathrm{B}}=10 ~\mathrm{k} \Omega$$, and $$\mathrm{R}_{\mathrm{C}}=1 ~\mathrm{k} \Omega$$. The value of $$x$$ is __________.

JEE Main 2023 (Online) 13th April Morning Shift Physics - Semiconductor Question 52 English

JEE Main 2023 (Online) 13th April Morning Shift
3

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

JEE Main 2022 (Online) 29th July Evening Shift Physics - Semiconductor Question 67 English

JEE Main 2022 (Online) 29th July Evening Shift
4

If the potential barrier across a p-n junction is $$0.6 \mathrm{~V}$$. Then the electric field intensity, in the depletion region having the width of $$6 \times 10^{-6} \mathrm{~m}$$, will be __________ $$\times 10^{5} \mathrm{~N} / \mathrm{C}$$.

JEE Main 2022 (Online) 29th July Morning Shift
5

The typical transfer characteristics 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 $$0.50 \,\mathrm{k} \Omega$$. The voltage gain of the transistor is ______________.

JEE Main 2022 (Online) 26th July Evening Shift Physics - Semiconductor Question 73 English

JEE Main 2022 (Online) 26th July Evening Shift
6

In the circuit shown below, maximum zener diode current will be _________ $$\mathrm{mA}$$.

JEE Main 2022 (Online) 26th July Morning Shift Physics - Semiconductor Question 74 English

JEE Main 2022 (Online) 26th July Morning Shift
7

Two ideal diodes are connected in the network as shown in figure. The equivalent resistance between A and B is __________ $$\Omega$$.

JEE Main 2022 (Online) 25th July Evening Shift Physics - Semiconductor Question 75 English

JEE Main 2022 (Online) 25th July Evening Shift
8

The energy band gap of semiconducting material to produce violet (wavelength = 4000$$\mathop A\limits^o $$ ) LED is ______________ $$\mathrm{eV}$$. (Round off to the nearest integer).

JEE Main 2022 (Online) 25th July Morning Shift
9

The circuit diagram used to study the characteristic curve of a zener diode is connected to variable power supply (0 $$-$$ 15 V) as shown in figure. A zener diode with maximum potential Vz = 10 V and maximum power dissipation of 0.4 W is connected across a potential divider arrangement. The value of resistance RP connected in series with the zener diode to protect it from the damage is ________________ $$\Omega$$.

JEE Main 2022 (Online) 30th June Morning Shift Physics - Semiconductor Question 78 English

JEE Main 2022 (Online) 30th June Morning Shift
10

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 $$\times$$ 105 ms$$-$$1. The speed with which electron enters the p side will be $${x \over 3} \times {10^5}$$ 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.)

JEE Main 2022 (Online) 29th June Evening Shift
11

A transistor is used in an amplifier circuit in common emitter mode. If the base current changes by 100 $$\mu$$A, it brings a change of 10 mA in collector current. If the load resistance is 2 k$$\Omega$$ and input resistance is 1 k$$\Omega$$, the value of power gain is x $$\times$$ 104. The value of x is _____________.

JEE Main 2022 (Online) 29th June Morning Shift
12

A zener of breakdown voltage Vz = 8 V and maximum zener current, IZM = 10 mA is subjectd to an input voltage Vi = 10 V with series resistance R = 100 $$\Omega$$. In the given circuit RL represents the variable load resistance. The ratio of maximum and minimum value of RL is _____________.

JEE Main 2022 (Online) 28th June Evening Shift Physics - Semiconductor Question 93 English

JEE Main 2022 (Online) 28th June Evening Shift
13

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.

JEE Main 2022 (Online) 27th June Evening Shift Physics - Semiconductor Question 89 English

JEE Main 2022 (Online) 27th June Evening Shift
14

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

JEE Main 2022 (Online) 26th June Morning Shift Physics - Semiconductor Question 85 English

JEE Main 2022 (Online) 26th June Morning Shift
15

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 Physics - Semiconductor Question 82 English

If the input resistance is 200 $$\Omega$$ and output resistance is 60 $$\Omega$$, the voltage gain in this experiment will be ____________.

JEE Main 2022 (Online) 25th June Evening Shift
16

In the given circuit, the value of current IL will be ____________ mA. (When RL = 1k$$\Omega$$)

JEE Main 2022 (Online) 24th June Evening Shift Physics - Semiconductor Question 80 English

JEE Main 2022 (Online) 24th June Evening Shift
17

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 _________.

JEE Main 2022 (Online) 24th June Morning Shift
18
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 Rs for safe operation should be ___________ $$\Omega$$.

JEE Main 2021 (Online) 27th August Evening Shift Physics - Semiconductor Question 102 English
JEE Main 2021 (Online) 27th August Evening Shift
19
A circuit is arranged as shown in figure. The output voltage V0 is equal to ................... V.

JEE Main 2021 (Online) 27th August Morning Shift Physics - Semiconductor Question 105 English
JEE Main 2021 (Online) 27th August Morning Shift
20
For the given circuit, the power across Zener diode is .............. mW.

JEE Main 2021 (Online) 26th August Evening Shift Physics - Semiconductor Question 106 English
JEE Main 2021 (Online) 26th August Evening Shift
21
A transistor is connected in common emitter circuit configuration, the collector supply voltage is 10 V and the voltage drop across a resistor of 1000 $$\Omega$$ in the collector circuit is 0.6 V. If the current gain factor ($$\beta$$) is 24, then the base current is _____________ $$\mu$$A. (Round off to the Nearest Integer)
JEE Main 2021 (Online) 27th July Morning Shift
22
In a semiconductor, the number density of intrinsic charge carries at 27$$^\circ$$C is 1.5 $$\times$$ 1016/m3. If the semiconductor is doped with impurity atom, the hole density increases to 4.5 $$\times$$ 1022/m3. The electron density in the doped semiconductor is ___________ $$\times$$ 109/m3.
JEE Main 2021 (Online) 25th July Evening Shift
23
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 will be __________ $$\Omega$$.

JEE Main 2021 (Online) 22th July Evening Shift Physics - Semiconductor Question 115 English
JEE Main 2021 (Online) 22th July Evening Shift
24
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 Rp is .................... $$\Omega$$.

JEE Main 2021 (Online) 20th July Evening Shift Physics - Semiconductor Question 117 English
JEE Main 2021 (Online) 20th July Evening Shift
25
For the forward biased diode characteristics shown in the figure, the dynamic resistance at ID = 3 mA will be __________ $$\Omega$$.

JEE Main 2021 (Online) 20th July Evening Shift Physics - Semiconductor Question 116 English
JEE Main 2021 (Online) 20th July Evening Shift
26
The typical output characteristics curve for a transistor working in the common-emitter configuration is shown in the figure.

JEE Main 2021 (Online) 18th March Evening Shift Physics - Semiconductor Question 120 English
The estimated current gain from the figure is __________.
JEE Main 2021 (Online) 18th March Evening Shift
27
An npn transistor operates as a common emitter amplifier with a power gain of 106. The input circuit resistance is 100$$\Omega$$ and the output load resistance is 10 K$$\Omega$$. The common emitter current gain '$$\beta$$' will be ________. (Round off to the Nearest Integer).
JEE Main 2021 (Online) 18th March Morning Shift
28
The value of power dissipated across the zener diode (Vz = 15V) connected in the circuit as shown in the figure is x $$\times$$ 10$$-$$1 watt.

JEE Main 2021 (Online) 16th March Morning Shift Physics - Semiconductor Question 126 English
The value of x, to the nearest integer, is __________.
JEE Main 2021 (Online) 16th March Morning Shift
29
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 ____________.

JEE Main 2021 (Online) 16th March Morning Shift Physics - Semiconductor Question 125 English
JEE Main 2021 (Online) 16th March Morning Shift
30
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 Physics - Semiconductor Question 127 English
JEE Main 2021 (Online) 26th February Evening Shift
31
The circuit contains two diodes each with a forward resistance of 50$$\Omega$$ and with infinite reverse resistance. If the battery voltage is 6V, the current through the 120$$\Omega$$ resistance is ____________ mA.

JEE Main 2021 (Online) 26th February Morning Shift Physics - Semiconductor Question 130 English
JEE Main 2021 (Online) 26th February Morning Shift
32
In connection with the circuit drawn below, the value of current flowing through 2 k$$\Omega$$ resistor is _________ $$\times$$ 10$$-$$4 A.

JEE Main 2021 (Online) 24th February Morning Shift Physics - Semiconductor Question 138 English
JEE Main 2021 (Online) 24th February Morning Shift
33
The output characteristics of a transistor is shown in the figure.
When VCE is 10V and IC = 4.0 mA, then value of $$\beta $$ac is __________. JEE Main 2020 (Online) 6th September Evening Slot Physics - Semiconductor Question 139 English
JEE Main 2020 (Online) 6th September Evening Slot
34
The circuit shown below is working as a 8 V dc regulated voltage source. When 12 V is used as input, the power dissipated (in mW) in each diode is; (considering both zener diodes are identical) _________. JEE Main 2020 (Online) 9th January Evening Slot Physics - Semiconductor Question 149 English
JEE Main 2020 (Online) 9th January Evening Slot
35
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 __________. JEE Main 2020 (Online) 9th January Morning Slot Physics - Semiconductor Question 152 English
JEE Main 2020 (Online) 9th January Morning Slot

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