Semiconductors — JEE Main PYQs

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

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

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

Identify the correct truth table of the given logical circuit.

Two p-n junction diodes ${\mathrm{D}}_1$ and ${\mathrm{D}}_2$ are connected as shown in figure. A and B are input signals and C is the output. The given circuit will function as a ______.

The given circuit works as :

If $X$ and $Y$ are the inputs, the given circuit works as ____.

Two 4 bits binary numbers, A=1101 and B=1010 are given in the inputs of a logic circuit shown in figure below. The output (Y) will be :

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A : A diode under reverse- biased condition provides very small current which is nearly independent of voltage until a critical limit at which the current increases dras …

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

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

In a semiconductor p-n diode, the doping concentrations on p-side and n-side are $10^{15}$ atoms/${\mathrm{cm}}^3$ and $10^{18}$ atoms $/{\mathrm{cm}}^3$, respectively. Which one of the following statement is true?

Refer to the logic circuit given below. For two inputs ($\mathrm{A}=1,\mathrm{B}=1$) and ($\mathrm{A}=0,\mathrm{B}=1$), output (Y) will be ______.

The output Y for the given inputs A and B to the circuit is :

For the given circuit (shown in part (A)) the time dependent input voltage ${\mathrm{v}}_{\text{in }}(\mathrm{t})$ and corresponding output ${\mathrm{v}}_{\mathrm{o}}(\mathrm{t})$ are shown in part (B) and part (C), respectively. Identify the components that are used in the circuit …

Which of the following circuits represents a forward biased diode?

Choose the correct answer from the options given below:

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

The truth table for the circuit given below is :

For the circuit shown above, equivalent GATE is :

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

The output of the circuit is low (zero) for :
(A) $\mathrm{X}=0,\mathrm{Y}=0$
(B) $X=0,Y=1$
(C) $X=1,Y=0$
(D) $\mathrm{X}=1,\mathrm{Y}=1$

Choose the correct answer from the options given below :

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 in …

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

Choose the correct logic circuit for the given truth table having inputs A and B .

The truth table corresponding to the circuit given below is

The Boolean expression $Y=A\overline{B}C+\overline{A}\overline{C}$ can be realised with which of the following gate configurations.
A. One 3-input AND gate, 3 NOT gates and one 2input OR gate, One 2-input AND gate,
B. One 3-input AND gate, 1 NOT gate, One 2input NOR gate and o …

Consider the following logic circuit.

The output is $\mathrm{Y}=0$ when :

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

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

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

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

Identify the logic gate given in the circuit :

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

Following gates section is connected in a complete suitable circuit.

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

The correct truth table for the following logic circuit is :

The output Y of following circuit for given inputs is :

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

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

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

The truth table of the given circuit diagram is :

The truth table for this given circuit is :

Which of the following circuits is reverse - biased ?

Identify the logic operation performed by the given circuit.

In the given circuit if the power rating of Zener diode is 10 mW, the value of series resistance ${\mathrm{R}}_{\mathrm{s}}$ to regulate the input unregulated supply is:

A Zener diode of breakdown voltage 10 V is used as a voltage regulator as shown in the figure. The current through the Zener diode is

The output of the given circuit diagram is

The power radiated from a linear antenna of length $l$ is proportional to

(Given, $\lambda =$ Wavelength of wave):

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

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 …

For an amplitude modulated wave the minimum amplitude is 3 V, while the modulation index is $60\%$. The maximum amplitude of the modulated wave is: