Semiconductor Devices and Logic Gates PYQs - Last 10 Years

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Practice 219 MHT CET Physics questions from Semiconductor Devices and Logic Gates. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.

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Last 10 Years Semiconductor Devices and Logic Gates Questions

Showing 50 of 219 filtered questions.

1Semiconductor Devices And Logic Gates

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

2Semiconductor Devices And Logic Gates

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

3Semiconductor Devices And Logic Gates

The following graph represents

4Semiconductor Devices And Logic Gates

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

5Semiconductor Devices And Logic Gates

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

6Semiconductor Devices And Logic Gates

The Boolean expression for the following combination is

7Semiconductor Devices And Logic Gates

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?

8Semiconductor Devices And Logic Gates

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

9Semiconductor Devices And Logic Gates

The following logic gate combination is equivalent to

10Semiconductor Devices And Logic Gates

In which figure, the junction diode is forward biased?

11Semiconductor Devices And Logic Gates

Which one of the following statements is WRONG regarding LED?

12Semiconductor Devices And Logic Gates

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

13Semiconductor Devices And Logic Gates

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

14Semiconductor Devices And Logic Gates

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

15Semiconductor Devices And Logic Gates

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

16Semiconductor Devices And Logic Gates

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

17Semiconductor Devices And Logic Gates

If \(p\)-\(n\) junction diode is in forward bias then

18Semiconductor Devices And Logic Gates

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}{\a...

19Semiconductor Devices And Logic Gates

Identify the mismatch out of the following.

20Semiconductor Devices And Logic Gates

21Semiconductor Devices And Logic Gates

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

22Semiconductor Devices And Logic Gates

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

23Semiconductor Devices And Logic Gates

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

24Semiconductor Devices And Logic Gates

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

25Semiconductor Devices And Logic Gates

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

26Semiconductor Devices And Logic Gates

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

27Semiconductor Devices And Logic Gates

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

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28Semiconductor Devices And Logic Gates

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?

29Semiconductor Devices And Logic Gates

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

30Semiconductor Devices And Logic Gates

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...

31Semiconductor Devices And Logic Gates

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

32Semiconductor Devices And Logic Gates

Choose the correct statement. In conductors

33Semiconductor Devices And Logic Gates

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.

34Semiconductor Devices And Logic Gates

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

35Semiconductor Devices And Logic Gates

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)

36Semiconductor Devices And Logic Gates

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

37Semiconductor Devices And Logic Gates

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

38Semiconductor Devices And Logic Gates

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)

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39Semiconductor Devices And Logic Gates

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...

40Semiconductor Devices And Logic Gates

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...

41Semiconductor Devices And Logic Gates

Choose the FALSE statement from the following.

42Semiconductor Devices And Logic Gates

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

43Semiconductor Devices And Logic Gates

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

44Semiconductor Devices And Logic Gates

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

45Semiconductor Devices And Logic Gates

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

46Semiconductor Devices And Logic Gates

The current in the following circuit is

47Semiconductor Devices And Logic Gates

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]

48Semiconductor Devices And Logic Gates

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 elect...

49Semiconductor Devices And Logic Gates

LED is manufactured using zinc selenide then it emits.

50Semiconductor Devices And Logic Gates

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