Semiconductor Devices and Logic Gates · Physics · MHT CET

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MCQ (Single Correct Answer)

1

To get the truth table shown from the following logic circuit, the logic gate G should be

MHT CET 2024 16th May Evening Shift Physics - Semiconductor Devices and Logic Gates Question 1 English

MHT CET 2024 16th May Evening Shift
2

The Boolean expression for the given combination of logic gates is

MHT CET 2024 16th May Evening Shift Physics - Semiconductor Devices and Logic Gates Question 2 English

MHT CET 2024 16th May Evening Shift
3

When a small amount of impurity atoms are added to semiconductor, then generally its resistivity

MHT CET 2024 16th May Evening Shift
4

The input signal given to C.E. amplifier having a voltage gain of 126 is $V_i=2 \cos \left(12 t+\frac{\pi}{3}\right)$. The corresponding output signal will be

MHT CET 2024 16th May Morning Shift
5

The truth table of the following circuit is

MHT CET 2024 16th May Morning Shift Physics - Semiconductor Devices and Logic Gates Question 4 English

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6

If the $\mathrm{p}-\mathrm{n}$ junction diode is unbiased,

MHT CET 2024 16th May Morning Shift
7

For detecting light intensity we use

MHT CET 2024 15th May Evening Shift
8

What is the current in the following junction diode circuit?

MHT CET 2024 15th May Evening Shift Physics - Semiconductor Devices and Logic Gates Question 7 English

MHT CET 2024 15th May Evening Shift
9

A p-n junction diode as a rectifier converts

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10

Two different logic gates giving output ' 1 ' for the inputs $(1,0)$ and then for $(0,1)$ are

MHT CET 2024 15th May Morning Shift
11

In an extrinsic n-type semiconductor, the free electrons donated by the impurity atoms occupy energy levels in

MHT CET 2024 15th May Morning Shift
12

For a transistor, current gain $(\beta)=50$. To change the collector current by $350 \mu \mathrm{~A}$, the base current should be changed by

MHT CET 2024 15th May Morning Shift
13

When n-p-n junction transistor is used as an amplifier in common emitter mode,

MHT CET 2024 11th May Evening Shift
14

Assuming that junction diode is ideal, the current in arrangement shown in figure

MHT CET 2024 11th May Evening Shift Physics - Semiconductor Devices and Logic Gates Question 10 English

MHT CET 2024 11th May Evening Shift
15

For the following digital logic circuit, the correct truth-table is

MHT CET 2024 11th May Evening Shift Physics - Semiconductor Devices and Logic Gates Question 11 English

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16

Following combination of gates is equivalent to

MHT CET 2024 11th May Morning Shift Physics - Semiconductor Devices and Logic Gates Question 18 English

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17

If ' $\mathrm{n}_{\mathrm{c}}$ ' and ' $\mathrm{n}_{\mathrm{h}}$ ' are the number of electrons and number of holes respectively in a semiconductor heavily doped with phosphorous then

MHT CET 2024 11th May Morning Shift
18

A p-n junction diode cannot be used

MHT CET 2024 11th May Morning Shift
19

In semiconductors at room temperature,

MHT CET 2024 10th May Evening Shift
20

In the given circuit, Zener breakdown voltage is 8 V . If power of Zener diode is 1.6 W . The value of $R$ is

MHT CET 2024 10th May Evening Shift Physics - Semiconductor Devices and Logic Gates Question 20 English

MHT CET 2024 10th May Evening Shift
21

The logic gate represented by following logic circuit is

MHT CET 2024 10th May Evening Shift Physics - Semiconductor Devices and Logic Gates Question 17 English

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22

Two ideal diodes are connected to a battery as shown in the circuit. The current supplied by the battery is

MHT CET 2024 10th May Morning Shift Physics - Semiconductor Devices and Logic Gates Question 23 English

MHT CET 2024 10th May Morning Shift
23

What is the output Y in the following circuit, when all the three inputs A, B, C are first 'zero' and then 'one'?

MHT CET 2024 10th May Morning Shift Physics - Semiconductor Devices and Logic Gates Question 22 English

MHT CET 2024 10th May Morning Shift
24

In the block diagram of simple rectifier circuit, from a variable a.c. voltage, constant d.c. voltage is obtained. The correct order of operation is

MHT CET 2024 10th May Morning Shift
25

In the working of photodiode, the reverse current depends on

MHT CET 2024 9th May Evening Shift
26

The resultant gate and its Boolean expression in the given circuit is

MHT CET 2024 9th May Evening Shift Physics - Semiconductor Devices and Logic Gates Question 25 English

MHT CET 2024 9th May Evening Shift
27

The current amplification factor of a transistor is 50 . The input resistance when used in common emitter mode is $1 \mathrm{k} \Omega$. The peak value for an a.c. input voltage of 0.01 V peak is

MHT CET 2024 9th May Morning Shift
28

In the logic circuit diagram, when all the four inputs $\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}$ are one, the outputs $\mathrm{Y}_1, \mathrm{Y}_2, \mathrm{Y}_3$ are respectively $(1,1,0)$. When all the inputs $\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}$ are changed to 'zero', the outputs $\mathrm{Y}_1, \mathrm{Y}_2, \mathrm{Y}_3$ respectively change to

MHT CET 2024 9th May Morning Shift Physics - Semiconductor Devices and Logic Gates Question 28 English

MHT CET 2024 9th May Morning Shift
29

For the diagram shown, the resistance between points A and B when the ideal diode ' $D$ ' is forward biased is ' $R_1$ ' and that when reverse biased is ' $R_2$ '. The ratio $\frac{R_1}{R_2}$ is

MHT CET 2024 9th May Morning Shift Physics - Semiconductor Devices and Logic Gates Question 27 English

MHT CET 2024 9th May Morning Shift
30

The truth table for the given logic circuit is

MHT CET 2024 4th May Evening Shift Physics - Semiconductor Devices and Logic Gates Question 31 English

MHT CET 2024 4th May Evening Shift
31

In the circuit diagram shown in figure, the current through the zener diode is

MHT CET 2024 4th May Evening Shift Physics - Semiconductor Devices and Logic Gates Question 30 English

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32

The depletion layer in p-n junction region is caused by

MHT CET 2024 4th May Evening Shift
33

The collector supply voltage is 6 V and a voltage drop across a resistor of $600 \Omega$ in the collector circuit is 0.6 V , in a circuit of transistor connected in common emitter mode. If the current gain is 20 then the base current is

MHT CET 2024 4th May Morning Shift
34

A zener diode, having breakdown voltage 15 V is used in a voltage regulator circuit as shown. The current through the zener diode is

MHT CET 2024 4th May Morning Shift Physics - Semiconductor Devices and Logic Gates Question 33 English

MHT CET 2024 4th May Morning Shift
35

A semiconductor device X is connected in series with a battery and a resistor. The current of 10 mA is found to pass through the circuit. If the terminals of X are connected in reverse manner, the current drops to almost zero. X may be

MHT CET 2024 4th May Morning Shift
36

The Boolean expression for ' $x-O R$ ' gate $C=(A \oplus B)$ is equal to

MHT CET 2024 3rd May Evening Shift
37

Which one of the following statements is true? A p-type semiconductor is doped with

MHT CET 2024 3rd May Evening Shift
38

The combination of NAND gates is shown in figure (I) and (II). For the given inputs, the outputs in both the combinations are respectively.

MHT CET 2024 3rd May Evening Shift Physics - Semiconductor Devices and Logic Gates Question 36 English

MHT CET 2024 3rd May Evening Shift
39

An n-p-n transistor can be considered to be equivalent to two diodes connected. The correct figure out of the following is

MHT CET 2024 3rd May Morning Shift Physics - Semiconductor Devices and Logic Gates Question 40 English

MHT CET 2024 3rd May Morning Shift
40

Find the magnitude of current in the given circuit.

MHT CET 2024 3rd May Morning Shift Physics - Semiconductor Devices and Logic Gates Question 39 English

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41

In common emitter transistor amplifier, load resistance is $6.5 \mathrm{k} \Omega$ and an input resistance is $1.3 \mathrm{k} \Omega$. If the current gain is 78 , the voltage gain is

MHT CET 2024 3rd May Morning Shift
42

The potential barrier in p-n junction diode is due to

MHT CET 2024 2nd May Evening Shift
43

The logic gate combination circuit shown in the figure performs the logic function of

MHT CET 2024 2nd May Evening Shift Physics - Semiconductor Devices and Logic Gates Question 42 English

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44

In semiconductors at room temperature,

MHT CET 2024 2nd May Morning Shift
45

The logic circuit in figure is equivalent to

MHT CET 2024 2nd May Morning Shift Physics - Semiconductor Devices and Logic Gates Question 44 English

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46

In an NPN transistor $10^{10}$ electrons enter the emitter in $10^{-6} \mathrm{~s}$ and $2 \%$ electrons recombine with holes in base. The current ratios ' $\alpha$ ' and ' $\beta$ ' of a transistor are respectively (nearly)

MHT CET 2024 2nd May Morning Shift
47

The output of following combination is same as that of

MHT CET 2023 14th May Evening Shift Physics - Semiconductor Devices and Logic Gates Question 78 English

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48

In an n-p-n transistor, the collector current is $$28 \mathrm{~mA}$$. If $$80 \%$$ of electrons reach the collector, its base current in $$\mathrm{mA}$$ is

MHT CET 2023 14th May Evening Shift
49

When the conductivity of a semiconductor is only due to the breaking of the covalent bonds, the semiconductor is called

MHT CET 2023 14th May Evening Shift
50

For a common emitter configuration, if '$$\alpha$$' and '$$\beta$$' have their usual meanings, the incorrect relation between '$$\alpha$$' and '$$\beta$$' is

MHT CET 2023 14th May Morning Shift
51

For emission of light, a light emitting diode (LED) is

MHT CET 2023 14th May Morning Shift
52

In semiconductors at room temperature,

MHT CET 2023 14th May Morning Shift
53

The Boolean expression for the following combination is

MHT CET 2023 13th May Evening Shift Physics - Semiconductor Devices and Logic Gates Question 82 English

MHT CET 2023 13th May Evening Shift
54

If the maximum efficiency of a full wave rectifier is $$x \%$$ and that of half-wave rectifier is $$y \%$$, then the relation between $$x$$ and $$y$$ is

MHT CET 2023 13th May Evening Shift
55

Doping of a semiconductor (with small impurity atoms) generally changes the resistivity as follows.

MHT CET 2023 13th May Evening Shift
56

The following graph represents

MHT CET 2023 13th May Morning Shift Physics - Semiconductor Devices and Logic Gates Question 87 English
MHT CET 2023 13th May Morning Shift
57

If two inputs of a NAND gate are shorted, the resulting gate is

MHT CET 2023 13th May Morning Shift
58

On increasing the reverse bias to a large value in a P-N junction diode, current

MHT CET 2023 13th May Morning Shift
59

In the following digital logic circuit, the output Y will be '1' for inputs

MHT CET 2023 12th May Evening Shift Physics - Semiconductor Devices and Logic Gates Question 93 English

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60

Which one of the following statements is WRONG regarding LED?

MHT CET 2023 12th May Evening Shift
61

In which figure, the junction diode is forward biased?

MHT CET 2023 12th May Evening Shift
62

The following logic gate combination is equivalent to

MHT CET 2023 12th May Morning Shift Physics - Semiconductor Devices and Logic Gates Question 92 English

MHT CET 2023 12th May Morning Shift
63

The logic gate combination circuit shown in the figure performs the logic function of

MHT CET 2023 12th May Morning Shift Physics - Semiconductor Devices and Logic Gates Question 91 English

MHT CET 2023 12th May Morning Shift
64

When forward bias is applied to a p-n junction, then what happens to the potential barrier $$\left(V_B\right)$$ and the width $$(\mathrm{X})$$ of the depletion region?

MHT CET 2023 12th May Morning Shift
65

In the study of transistor as an amplifier if $$\alpha=\frac{I_C}{I_E}=0.98$$ and $$\beta=\frac{I_C}{I_B}=49$$, where $$I_C, I_B$$ and $$\mathrm{I}_{\mathrm{E}}$$ are collector, base and emitter current respectively then $$\left(\frac{1}{\alpha}-\frac{1}{\beta}\right)$$ is equal to

MHT CET 2023 11th May Evening Shift
66

If $$p$$-$$n$$ junction diode is in forward bias then

MHT CET 2023 11th May Evening Shift
67

In the digital circuit the inputs are as shown in figure. The Boolean expression for output $$\mathrm{Y}$$ is

MHT CET 2023 11th May Evening Shift Physics - Semiconductor Devices and Logic Gates Question 94 English

MHT CET 2023 11th May Evening Shift
68

Identify the correct circuit diagrams for the normal operation from the following.

MHT CET 2023 11th May Morning Shift Physics - Semiconductor Devices and Logic Gates Question 97 English

MHT CET 2023 11th May Morning Shift
69

In energy band diagram of insulators, a band gap and the conduction band is respectively

MHT CET 2023 11th May Morning Shift
70

In the case of NAND gate, if A and B are the inputs and $$\mathrm{Y}$$ is the output then

MHT CET 2023 11th May Morning Shift
71

A pure $$\mathrm{Si}$$ crystal has $$4 \times 10^{28}$$ atoms per $$\mathrm{m}^3$$. It is doped by 1 ppm concentration of antimony. The number of free electrons available will be

MHT CET 2023 10th May Evening Shift
72

The output of an 'OR' gate is connected to both the inputs of a 'NAND' gate. The combination will serve as

MHT CET 2023 10th May Evening Shift
73

Which one of the operations of $$\mathrm{n}-\mathrm{p}-\mathrm{n}$$ transistor differs from that of $$p-n-p$$ transistor?

MHT CET 2023 10th May Evening Shift
74

For the diagram shown, the resistances between points A and B when ideal diode D is forward biased is '$$R_1$$' and that when reverse biased is '$$R_2$$'. The ratio $$R_1: R_2$$ is

MHT CET 2023 10th May Evening Shift Physics - Semiconductor Devices and Logic Gates Question 100 English

MHT CET 2023 10th May Evening Shift
75

To obtain the truth-table shown, from the following logic circuit, the gate G should be

MHT CET 2023 10th May Morning Shift Physics - Semiconductor Devices and Logic Gates Question 98 English

MHT CET 2023 10th May Morning Shift
76

In insulators

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77

Identify the mismatch out of the following.

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78

In the reverse biasing of a p-n junction diode :

MHT CET 2023 9th May Evening Shift
79

In a transistor, in common emitter configuration, the ratio of power gain to voltage gain is

MHT CET 2023 9th May Evening Shift
80

If the frequency of the input voltage is $$50 \mathrm{~Hz}$$, applied to a (a) half wave rectifier and (b) full wave rectifier. The output frequency in both cases is respectively

MHT CET 2023 9th May Evening Shift
81

For an intrinsic semiconductor $$\left(\mathrm{n}_{\mathrm{h}}\right.$$ and $$\mathrm{n}_{\mathrm{e}}$$ are the number of holes per unit volume and number of electrons per unit volume respectively)

MHT CET 2023 9th May Morning Shift
82

A $$5.0 \mathrm{~V}$$ stabilized power supply is required to be designed using a $$12 \mathrm{~V}$$ DC power supply as input source. The maximum power rating of zener diode is $$2.0 \mathrm{~W}$$. The minimum value of resistance $$R_{\mathrm{s}}$$ in $$\Omega$$ connected in series with zener diode will be

MHT CET 2023 9th May Morning Shift
83

To get the truth table shown, from the following logic circuit, the Gate G should be

MHT CET 2023 9th May Morning Shift Physics - Semiconductor Devices and Logic Gates Question 112 English

MHT CET 2023 9th May Morning Shift
84

For a NAND gate, the inputs and outputs are given below.

Input A Input B Output Y
0 1 $$\mathrm{C}$$
0 0 $$\mathrm{D}$$
1 0 $$\mathrm{E}$$
1 1 $$\mathrm{F}$$

The values taken by C, D, E, F are respectively

MHT CET 2022 11th August Evening Shift
85

The given circuit has two ideal diodes $$D_1$$ and $$D_2$$ connected as shown in the figure. The current flowing through the resistance $$R_1$$ will be

MHT CET 2022 11th August Evening Shift Physics - Semiconductor Devices and Logic Gates Question 74 English

MHT CET 2022 11th August Evening Shift
86

Choose the correct statement. In conductors

MHT CET 2021 24th September Evening Shift
87

For a transistor, the current ratio $$\alpha_{\mathrm{dc}}=\frac{69}{70}$$, the current gain $$\beta_{\mathrm{dc}}$$ is

MHT CET 2021 24th September Evening Shift
88

The input a.c. voltage of frequency $$60 \mathrm{~Hz}$$ is applied to half-wave rectifier and also to full-wave rectifier. The output frequency in case of half-wave rectifier and that in case of full wave rectifier is respectively.

MHT CET 2021 24th September Evening Shift
89

A p-n junction photodiode is fabricated from a semiconductor with a band gap of $$2.5 \mathrm{~eV}$$. It can detect a signal of wavelength [Planck's constant $$=6.6 \times 10^{-34} \mathrm{Js}, \mathrm{c}=3 \times 10^8 \mathrm{~m} / \mathrm{s}, \mathrm{e}=1.6 \times 10^{-19} \mathrm{C}$$]

MHT CET 2021 24th September Morning Shift
90

For the output of the following logic circuit to be 'I', the values of inputs A and B should be respectively

MHT CET 2021 24th September Morning Shift Physics - Semiconductor Devices and Logic Gates Question 61 English

MHT CET 2021 24th September Morning Shift
91

Two identical ideal diodes are connected to an ammeter and a d.c source (1 volt) as shown. In which one of the following circuits, ammeter will not show any deflection?

MHT CET 2021 24th September Morning Shift Physics - Semiconductor Devices and Logic Gates Question 60 English

MHT CET 2021 24th September Morning Shift
92

When the temperature of a semiconductor is increased, its resistance and electric conductivity respectively.

MHT CET 2021 23rd September Evening Shift
93

For a two input AND gate, the four entries are shown in the truth table. Identify the correct ones out of these $$(\mathrm{A}, \mathrm{B}=$$ input, $$\mathrm{Y}=$$ output)

Entry A B Y
1 0 1 0
2 1 0 0
3 1 1 1
4 0 0 1

MHT CET 2021 23rd September Evening Shift
94

In a CE transistor, a change of $$8.0 \mathrm{~mA}$$ in the emitter current produces a change of $$7.8 \mathrm{~mA}$$ in the collector current. What change in the base current is necessary to produce the same change in the collector current?

MHT CET 2021 23rd September Evening Shift
95

The resultant gate and its Boolean expression in the given circuit is

MHT CET 2021 23th September Morning Shift Physics - Semiconductor Devices and Logic Gates Question 66 English

MHT CET 2021 23th September Morning Shift
96

What are the values of the currents flowing in each of the following diode circuits $$\mathrm{X}$$ and $$\mathrm{Y}$$ respectively? (Assume that the diodes are ideal)

MHT CET 2021 23th September Morning Shift Physics - Semiconductor Devices and Logic Gates Question 67 English

MHT CET 2021 23th September Morning Shift
97

In common emitter amplifier, a change of 0.2 mA in the base current causes a change of 5 mA in the collector current. If input resistance is 2 k$$\Omega$$ and voltage gain is 75, the load resistance used in the circuit is

MHT CET 2021 23th September Morning Shift
98

Which of the following gates will give an output '1' for the given inputs?

MHT CET 2021 22th September Evening Shift Physics - Semiconductor Devices and Logic Gates Question 71 English

MHT CET 2021 22th September Evening Shift
99

For a common-emitter amplifier, the voltage gain is 40. Its input and output impedances are $$100 \Omega$$ and $$400 \Omega$$, respectively. The power gain of the CE amplifier will be

MHT CET 2021 22th September Evening Shift
100

Choose the correct statement. In semiconductors valance band and conduction band

MHT CET 2021 22th September Evening Shift
101

A logic gate which gives output 'HIGH' only when its two input terminals are at different logic levels with respect to each other is

MHT CET 2021 22th September Morning Shift
102

Choose the FALSE statement from the following.

MHT CET 2021 22th September Morning Shift
103

In an n-p-n transistor 200 electrons enter the emitter in 10$$^{-8}$$ second. If 1% electrons are lost in the base, then the current that enters the emitter and the current amplification factor are respectively [e = 1.6 $$\times$$ 10$$^{-19}$$ C]

MHT CET 2021 22th September Morning Shift
104

Combination of NAND gates is shown in the figure. It is equivalent to

MHT CET 2021 21th September Evening Shift Physics - Semiconductor Devices and Logic Gates Question 118 English

MHT CET 2021 21th September Evening Shift
105

In an ideal junction diode, the current flowing through PQ is

MHT CET 2021 21th September Evening Shift Physics - Semiconductor Devices and Logic Gates Question 116 English

MHT CET 2021 21th September Evening Shift
106

LED is manufactured using zinc selenide then it emits.

MHT CET 2021 21th September Evening Shift
107

In a pure silicon, number of electrons and holes per unit volume are $$1.6 \times 10^{16} \mathrm{~m}^{-3}$$. If silicon is doped with Boron in a way that on doping hole density increases to $$4 \times 10^{22} \mathrm{~m}^{-3}$$. Then electron density in doped semiconductor will be

MHT CET 2021 21th September Morning Shift
108

For a transitor, $$\frac{1}{\alpha_{\mathrm{DC}}}-\frac{1}{\beta_{\mathrm{DC}}}$$ is equal to [ $$\alpha_{\mathrm{DC}}$$ and $$\beta_{\mathrm{DC}}$$ are current amplification factors]

MHT CET 2021 21th September Morning Shift
109

The current in the following circuit is

MHT CET 2021 21th September Morning Shift Physics - Semiconductor Devices and Logic Gates Question 120 English

MHT CET 2021 21th September Morning Shift
110

The output of an 'OR' gate is 'one'

MHT CET 2021 20th September Evening Shift
111

In the case of insulators, a band gap and conduction band is respectively

MHT CET 2021 20th September Evening Shift
112

A rectifier is used to

MHT CET 2021 20th September Evening Shift
113

Two different logic gates moving output '0' for the inputs (0, 1) and then for (1, 0) are

MHT CET 2021 20th September Morning Shift
114

The frequency of a given a.c. signal is 'N' Hz. When it is connected to a half wave rectifier, the number of output pulses given by the rectifier in 1 second is

MHT CET 2021 20th September Morning Shift
115

Silicon and copper are cooled from 300 K to 100 K, the specific resistance (resistivity)

MHT CET 2021 20th September Morning Shift
116

A transistor having $\alpha=0.8$ is connected in common emitter configuration. When the base current changes by 6 mA , then the change in collector current is

MHT CET 2020 19th October Evening Shift
117

In an intrinsic semiconductor, at an ordinary temperature, the correct relation between the number of electrons per unit volume $n_e$ and number of holes per unit volume $n_h$.

MHT CET 2020 19th October Evening Shift
118

$$A$$ transistor has a voltage gain $$A$$. If the amount $$\beta A$$ of its output is applied to the input of the transistor, then the transistor becomes oscillator, when

MHT CET 2020 16th October Evening Shift
119

At absolute zero temperature, pure silicon behaves as

MHT CET 2020 16th October Evening Shift
120

In common emitter amplifier, input resistance is $$1000 \Omega$$, peak value of input signal voltage is $$5 \mathrm{~mV}$$ and $$\beta=60$$. The peak value of output current is

MHT CET 2020 16th October Morning Shift
121

When a small amount of impurity atoms are added to a semiconductor, then generally its resistivity

MHT CET 2020 16th October Morning Shift
122

$V-I$ characterstics of LED is shown correctly by graph

MHT CET 2019 3rd May Morning Shift
123

Which of the following regions of a transistors are, respectively, heavily dopped and lightly dopped?

MHT CET 2019 3rd May Morning Shift
124

In case of $p$-n junction diode, the width of depletion region is

MHT CET 2019 2nd May Evening Shift
125

In the study of transistor as an amplifier, the ratio of collector current to emitter current is 0.98 then the ratio of collector current to base current will be

MHT CET 2019 2nd May Evening Shift
126

Assuming that the junction diode is ideal, the current in the arrangement shown in figure is

MHT CET 2019 2nd May Morning Shift Physics - Semiconductor Devices and Logic Gates Question 51 English

MHT CET 2019 2nd May Morning Shift
127

. For a transistor, the current ratio ' $\beta_{d c}$ ' is defined as the ratio of

MHT CET 2019 2nd May Morning Shift
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