JEE Semiconductor Electronics PYQs with Solutions PDF, Check

The charge stored by the capacitor C in the given circuit in the steady state is ______ $$\mu C$$.

The given circuit works as:

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

The following diagram shows a Zener diode as a voltage regulator. The Zener diode is rated at $$V_{z}=5V$$ and the desired current in load is 5 mA. The unregulated voltage source can supply upto 25 V. Considering the Zener diode can withstand four times of the load current, the value of resistor $$R_{s}$$ (shown in circuit) should be ____ Ω .

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

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

Identify the correct truth table of the given logic circuit.

Assuming in forward bias condition there is a voltage drop of 0.7V across a silicon diode, the current through diode $$D_{1}$$ in the circuit is ___ mA.
(Assume all diodes in the given circuit are identical)

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

Two p-n junction diodes $$D_{1}\text{ and }D_{2}$$ are connected as shown in figure. A and B are input signals and C is the output. The given circuit will function as a________.

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

Which of the following circuits represents a forward biased diode?

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 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:

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

$$(A)\; X=0,\,Y=0 \text{ }(B)\; X=0,\,Y=1 \text{ }(C)\; X=1,\,Y=0 \text{ }(D)\; X=1,\,Y=1$$ Choose the correct answer from the options given below:

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

For the circuit shown above, equivalent GATE is :

The truth table for the circuit given below is :

In the circuit shown here, assuming threshold voltage of diode is negligibly small, then voltage $$V_{AB}$$ is correctly represented by :

In the given circuit if the power rating of Zener diode is $$10$$ mW, the value of series resistance $$R_s$$ to regulate the input unregulated supply is:

Conductivity of a photodiode starts changing only if the wavelength of incident light is less than 660 nm. The band gap of photodiode is found to be $$\frac{X}{8}$$ eV. The value of X is: (Given $$h = 6.6 \times 10^{-34}$$ J s, $$e = 1.6 \times 10^{-19}$$ C)

Which of the following circuits is reverse-biased?

The truth table of the given circuit diagram is :

The truth table for this given circuit is:

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

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

Identify the logic operation performed by the given circuit.

The output of the given circuit diagram is

Identify the logic gate given in the circuit:

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

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) :

Given below are two statements: Statement I : Bromination of phenol in solvent with low polarity such as $$CHCl_3$$ or $$CS_2$$ requires Lewis acid catalyst. Statement II : The Lewis acid catalyst polarises the bromine to generate $$Br^+$$. In the light of the above statements, choose the correct answer from the options given below :

The correct truth table for the following logic circuit is :

Given below are two statements : Statement I : Picric acid is 2,4,6 - trinitrotoluene. Statement II : Phenol - 2,4 - disulphonic acid is treated with Conc. $$HNO_3$$ to get picric acid. In the light of the above statements, choose the most appropriate answer from the options given below :

In Reimer - Tiemann reaction, phenol is converted into salicylaldehyde through an intermediate. The structure of intermediate is _____

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

Match List - I with List - II.

Choose the correct answer from the options given below :

The output Y of following circuit for given inputs is :

Identify the major products A and B respectively in the following set of reactions.

Which one of the following compounds will readily react with dilute NaOH?