Semiconductors - JEE Main Previous Year Questions with Solutions

JEE Main Previous Year Question of Physics with Solutions are available here. Practicing JEE Main Previous Year Papers Questions of Physics will help all the JEE aspirants in realizing the question pattern as well as help in analyzing their weak & strong areas.

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Previous Years AIEEE/JEE Mains Questions

Q. An p-n junction (D) shown in the figure can act as a rectifier. An alternating current source (V) is connected in the circuit. The current (I) in the resistor R can be shown by:

[AIEEE-2009]

Sol. (3)

When postive cycle enters into diode it is forward bias while for negative half cycle it is reversed bias.

Q. The logic circuit shown below has the input wave forms ‘A’ and ‘B’ as shown. Pick out the correct output waveform.

[AIEEE-2009]

Sol. (1)

Q. The combination of gates shown below yields.

(1) XOR gate (2) NAND gate (3) OR gate (4) NOT gate

[AIEEE-2010]

Sol. (3)

No need

Q. Truth table for system of four NAND gates as shown in figure is:

[AIEEE-2012]

Sol. (3)

No need

Q. The I-V characteristic of an LED is

[JEE Main 2013]

Sol. (4)

I $\alpha \frac{1}{\lambda}$ more $\lambda,$ less intensity and less energy.

Q. The forward biased diode connection is:

[JEE Main-2014]

Sol. (4)

If n side is at low potential relative to P side then diode is forward bias.

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

$(1) \alpha=\frac{\beta^{2}}{1+\beta^{2}}$

(2) $\frac{1}{\alpha}=\frac{1}{\beta}+1$

(3) $\alpha=\frac{\beta}{1-\beta}$

(4) $\alpha=\frac{\beta}{1+\beta}$

[JEE Main-2016]

Sol. (1,3)

$\alpha=\frac{I_{C}}{I_{e}}, \beta=\frac{I_{C}}{I_{b}}$

$I_{e}=I_{b}+I_{c}$

$\Rightarrow \frac{I_{e}}{I_{c}}=\frac{I_{b}}{I_{c}}+1 \quad \Rightarrow \quad \frac{1}{\alpha}=\frac{1}{\beta}+1$

Q. 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]

Sol. (4)

Output of OR gate is 0 when all inputs are 0 & output is 1 when atleast one of the input is 1.

Observing output x :- It is 0 when all inputs are 0 & it is 1 when atleast one of the inputs is 1.

$\therefore$ OR gate

Q. The temperature dependence of resistances of Cu and undoped Si in the temperature range 300-400K, is best described by :-

(1) Linear decrease for Cu, linear decrease for Si.

(2) Linear increase for Cu, linear increase for Si.

(3) Linear increase for Cu, exponential increase for Si

(4) Linear increase for Cu, exponential decrease for Si

[JEE Main-2016]

Sol. (4)

Factual

Cu is conductor so with increase in temperature, resistance will increase

Si is semiconductor so with increase in temperature resistance will decrease

Q. Identify the semiconductor devices whose characteristics are given below, in the order (a), (b), (c), (d) :-

(1) Zener diode, Solar cell, Simple diode, Light dependent resistance

(2) Simple diode, Zener diode, Solar cell, Light dependent resistance

(3) Zener diode, Simple diode, Light dependent resistance, Solar cell

(4) Solar cell, Light dependent resistance, Zener diode, Simple diode

[JEE Main-2016]

Sol. (2)

Factual

Q. In a common emitter amplifier circuit using an n-p-n transistor, the phase difference between the input and the output voltages will be :

(1) $135^{\circ}$

(2) $180^{\circ}$

(3) $45^{\circ}$

(4) $90^{\circ}$

[JEE Main-2017]

Sol. (2)

In common emitter amplifier circuit input and out put voltage are out of phase. When input

voltage is increased then $\mathrm{i}_{\mathrm{b}}$ is increased, i also increases so voltage drop across $\mathrm{R}_{\mathrm{c}}$ is increased.

However increase in voltage across $\mathrm{R}_{\mathrm{C}}$ is in opposite sense.

Q. The reading of the ammeter for a silicon diode in the given circuit is :-

[JEE Main-2018]

Sol. (2)

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