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Home/JEE MAINS/physics/semiconductor electronics
Curated PYQ Collection

Top 50 Most Repeated SEMICONDUCTOR ELECTRONICS PYQs | JEE MAINS

A curated collection of the most important questions from SEMICONDUCTOR ELECTRONICS, fully solved with step-by-step concepts to prepare for JEE MAINS.

Question #1

Practice Question

A.Forward breakdown
B.Reverse breakdown
C.Forward bias
D.No bias

Concept Applied

Zener diodes work in reverse breakdown region....

Read Full Step-by-Step Solution →

Question #2

Practice Question

A.0.79 V
B.0.56 V
C.0.95 V
D.1.12 V

Concept Applied

The built‑in potential is $V_{bi}=\frac{kT}{q}\ln\left(\frac{N_A N_D}{n_i^2}\right)$. Computing the ratio $\frac{N_A N_D}{n_i^2}=\frac{(1\times10^{17}...

Read Full Step-by-Step Solution →

Question #3

Practice Question

A.$\bar{A} \cdot \bar{B}$
B.$A \cdot B$
C.$\bar{A} + \bar{B}$
D.$A + B$

Concept Applied

De Morgan's law: $\overline{A + B} = \bar{A} \cdot \bar{B}$. Direct application....

Read Full Step-by-Step Solution →

Question #4

Practice Question

A.10 V
B.20 V
C.5 V
D.14.14 V

Concept Applied

In a center-tapped full-wave rectifier, during the negative half-cycle, one diode is reverse-biased and sees the full voltage across the entire second...

Read Full Step-by-Step Solution →

Question #5

Practice Question

A.p-side connected to +ve terminal
B.n-side connected to +ve terminal
C.no battery connected
D.reverse voltage applied

Concept Applied

Forward bias means p-side to positive, n-side to negative of battery....

Read Full Step-by-Step Solution →

Question #6

Practice Question

Concept Applied

For a full‑wave bridge rectifier, \(V_{avg}=\frac{2V_{p}}{\pi}\). With \(V_{p}=20\) V, \(V_{avg}=\frac{40}{\pi}\approx12.73\) V....

Read Full Step-by-Step Solution →

Question #7

Practice Question

A.Limit Zener current
B.Increase load voltage
C.Reduce input noise
D.Block AC component

Concept Applied

Series resistor limits current through Zener to prevent damage....

Read Full Step-by-Step Solution →

Question #8

Practice Question

A.$\bar{A} \cdot \bar{B}$
B.$\bar{A} + \bar{B}$
C.$A \cdot B$
D.$\overline{A \cdot B}$

Concept Applied

De Morgan's theorem: $\overline{A+B} = \bar{A} \cdot \bar{B}$...

Read Full Step-by-Step Solution →

Question #9

Practice Question

Concept Applied

For a half‑wave rectifier with a capacitor filter, the ripple factor $r \approx \frac{1}{2fRC}$. Setting $r<0.05$ and solving for $C$ gives $C > \frac...

Read Full Step-by-Step Solution →

Question #10

Practice Question

A.No phase difference
B.$ \pi/2 $ phase difference
C.$ \pi $ phase difference
D.$ 3\pi/2 $ phase difference

Concept Applied

In CE configuration, output is inverted relative to input — phase shift of $ \pi $ radians....

Read Full Step-by-Step Solution →

Question #11

Practice Question

A.$\bar{A} + \bar{B} + C$
B.$\bar{A}\bar{B} + C$
C.$(\bar{A}+\bar{B})C$
D.$\bar{A}+\bar{B}+\bar{C}$

Concept Applied

Apply De Morgan's law to the sum and then the product....

Read Full Step-by-Step Solution →

Question #12

Practice Question

A.Forward breakdown
B.Reverse breakdown
C.Forward bias
D.No bias

Concept Applied

Zener diodes work in reverse breakdown region....

Read Full Step-by-Step Solution →

Question #13

Practice Question

A.0.79 V
B.0.56 V
C.0.95 V
D.1.12 V

Concept Applied

The built‑in potential is $V_{bi}=\frac{kT}{q}\ln\left(\frac{N_A N_D}{n_i^2}\right)$. Computing the ratio $\frac{N_A N_D}{n_i^2}=\frac{(1\times10^{17}...

Read Full Step-by-Step Solution →

Question #14

Practice Question

A.$\bar{A} \cdot \bar{B}$
B.$A \cdot B$
C.$\bar{A} + \bar{B}$
D.$A + B$

Concept Applied

De Morgan's law: $\overline{A + B} = \bar{A} \cdot \bar{B}$. Direct application....

Read Full Step-by-Step Solution →

Question #15

Practice Question

A.10 V
B.20 V
C.5 V
D.14.14 V

Concept Applied

In a center-tapped full-wave rectifier, during the negative half-cycle, one diode is reverse-biased and sees the full voltage across the entire second...

Read Full Step-by-Step Solution →

Question #16

Practice Question

A.p-side connected to +ve terminal
B.n-side connected to +ve terminal
C.no battery connected
D.reverse voltage applied

Concept Applied

Forward bias means p-side to positive, n-side to negative of battery....

Read Full Step-by-Step Solution →

Question #17

Practice Question

Concept Applied

For a full‑wave bridge rectifier, \(V_{avg}=\frac{2V_{p}}{\pi}\). With \(V_{p}=20\) V, \(V_{avg}=\frac{40}{\pi}\approx12.73\) V....

Read Full Step-by-Step Solution →

Question #18

Practice Question

A.Limit Zener current
B.Increase load voltage
C.Reduce input noise
D.Block AC component

Concept Applied

Series resistor limits current through Zener to prevent damage....

Read Full Step-by-Step Solution →

Question #19

Practice Question

A.$\bar{A} \cdot \bar{B}$
B.$\bar{A} + \bar{B}$
C.$A \cdot B$
D.$\overline{A \cdot B}$

Concept Applied

De Morgan's theorem: $\overline{A+B} = \bar{A} \cdot \bar{B}$...

Read Full Step-by-Step Solution →

Question #20

Practice Question

Concept Applied

For a half‑wave rectifier with a capacitor filter, the ripple factor $r \approx \frac{1}{2fRC}$. Setting $r<0.05$ and solving for $C$ gives $C > \frac...

Read Full Step-by-Step Solution →

Question #21

Practice Question

A.No phase difference
B.$ \pi/2 $ phase difference
C.$ \pi $ phase difference
D.$ 3\pi/2 $ phase difference

Concept Applied

In CE configuration, output is inverted relative to input — phase shift of $ \pi $ radians....

Read Full Step-by-Step Solution →

Question #22

Practice Question

A.$\bar{A} + \bar{B} + C$
B.$\bar{A}\bar{B} + C$
C.$(\bar{A}+\bar{B})C$
D.$\bar{A}+\bar{B}+\bar{C}$

Concept Applied

Apply De Morgan's law to the sum and then the product....

Read Full Step-by-Step Solution →

Question #23

Practice Question

A.Forward breakdown
B.Reverse breakdown
C.Forward bias
D.No bias

Concept Applied

Zener diodes work in reverse breakdown region....

Read Full Step-by-Step Solution →

Question #24

Practice Question

A.0.79 V
B.0.56 V
C.0.95 V
D.1.12 V

Concept Applied

The built‑in potential is $V_{bi}=\frac{kT}{q}\ln\left(\frac{N_A N_D}{n_i^2}\right)$. Computing the ratio $\frac{N_A N_D}{n_i^2}=\frac{(1\times10^{17}...

Read Full Step-by-Step Solution →

Question #25

Practice Question

A.$\bar{A} \cdot \bar{B}$
B.$A \cdot B$
C.$\bar{A} + \bar{B}$
D.$A + B$

Concept Applied

De Morgan's law: $\overline{A + B} = \bar{A} \cdot \bar{B}$. Direct application....

Read Full Step-by-Step Solution →

Question #26

Practice Question

A.10 V
B.20 V
C.5 V
D.14.14 V

Concept Applied

In a center-tapped full-wave rectifier, during the negative half-cycle, one diode is reverse-biased and sees the full voltage across the entire second...

Read Full Step-by-Step Solution →

Question #27

Practice Question

A.p-side connected to +ve terminal
B.n-side connected to +ve terminal
C.no battery connected
D.reverse voltage applied

Concept Applied

Forward bias means p-side to positive, n-side to negative of battery....

Read Full Step-by-Step Solution →

Question #28

Practice Question

Concept Applied

For a full‑wave bridge rectifier, \(V_{avg}=\frac{2V_{p}}{\pi}\). With \(V_{p}=20\) V, \(V_{avg}=\frac{40}{\pi}\approx12.73\) V....

Read Full Step-by-Step Solution →

Question #29

Practice Question

A.Limit Zener current
B.Increase load voltage
C.Reduce input noise
D.Block AC component

Concept Applied

Series resistor limits current through Zener to prevent damage....

Read Full Step-by-Step Solution →

Question #30

Practice Question

A.$\bar{A} \cdot \bar{B}$
B.$\bar{A} + \bar{B}$
C.$A \cdot B$
D.$\overline{A \cdot B}$

Concept Applied

De Morgan's theorem: $\overline{A+B} = \bar{A} \cdot \bar{B}$...

Read Full Step-by-Step Solution →

Question #31

Practice Question

Concept Applied

For a half‑wave rectifier with a capacitor filter, the ripple factor $r \approx \frac{1}{2fRC}$. Setting $r<0.05$ and solving for $C$ gives $C > \frac...

Read Full Step-by-Step Solution →

Question #32

Practice Question

A.No phase difference
B.$ \pi/2 $ phase difference
C.$ \pi $ phase difference
D.$ 3\pi/2 $ phase difference

Concept Applied

In CE configuration, output is inverted relative to input — phase shift of $ \pi $ radians....

Read Full Step-by-Step Solution →

Question #33

Practice Question

A.$\bar{A} + \bar{B} + C$
B.$\bar{A}\bar{B} + C$
C.$(\bar{A}+\bar{B})C$
D.$\bar{A}+\bar{B}+\bar{C}$

Concept Applied

Apply De Morgan's law to the sum and then the product....

Read Full Step-by-Step Solution →

Question #34

Practice Question

A.Forward breakdown
B.Reverse breakdown
C.Forward bias
D.No bias

Concept Applied

Zener diodes work in reverse breakdown region....

Read Full Step-by-Step Solution →

Question #35

Practice Question

A.0.79 V
B.0.56 V
C.0.95 V
D.1.12 V

Concept Applied

The built‑in potential is $V_{bi}=\frac{kT}{q}\ln\left(\frac{N_A N_D}{n_i^2}\right)$. Computing the ratio $\frac{N_A N_D}{n_i^2}=\frac{(1\times10^{17}...

Read Full Step-by-Step Solution →

Question #36

Practice Question

A.$\bar{A} \cdot \bar{B}$
B.$A \cdot B$
C.$\bar{A} + \bar{B}$
D.$A + B$

Concept Applied

De Morgan's law: $\overline{A + B} = \bar{A} \cdot \bar{B}$. Direct application....

Read Full Step-by-Step Solution →

Question #37

Practice Question

A.10 V
B.20 V
C.5 V
D.14.14 V

Concept Applied

In a center-tapped full-wave rectifier, during the negative half-cycle, one diode is reverse-biased and sees the full voltage across the entire second...

Read Full Step-by-Step Solution →

Question #38

Practice Question

A.p-side connected to +ve terminal
B.n-side connected to +ve terminal
C.no battery connected
D.reverse voltage applied

Concept Applied

Forward bias means p-side to positive, n-side to negative of battery....

Read Full Step-by-Step Solution →

Question #39

Practice Question

Concept Applied

For a full‑wave bridge rectifier, \(V_{avg}=\frac{2V_{p}}{\pi}\). With \(V_{p}=20\) V, \(V_{avg}=\frac{40}{\pi}\approx12.73\) V....

Read Full Step-by-Step Solution →

Question #40

Practice Question

A.Limit Zener current
B.Increase load voltage
C.Reduce input noise
D.Block AC component

Concept Applied

Series resistor limits current through Zener to prevent damage....

Read Full Step-by-Step Solution →

Question #41

Practice Question

A.$\bar{A} \cdot \bar{B}$
B.$\bar{A} + \bar{B}$
C.$A \cdot B$
D.$\overline{A \cdot B}$

Concept Applied

De Morgan's theorem: $\overline{A+B} = \bar{A} \cdot \bar{B}$...

Read Full Step-by-Step Solution →

Question #42

Practice Question

Concept Applied

For a half‑wave rectifier with a capacitor filter, the ripple factor $r \approx \frac{1}{2fRC}$. Setting $r<0.05$ and solving for $C$ gives $C > \frac...

Read Full Step-by-Step Solution →

Question #43

Practice Question

A.No phase difference
B.$ \pi/2 $ phase difference
C.$ \pi $ phase difference
D.$ 3\pi/2 $ phase difference

Concept Applied

In CE configuration, output is inverted relative to input — phase shift of $ \pi $ radians....

Read Full Step-by-Step Solution →

Question #44

Practice Question

A.$\bar{A} + \bar{B} + C$
B.$\bar{A}\bar{B} + C$
C.$(\bar{A}+\bar{B})C$
D.$\bar{A}+\bar{B}+\bar{C}$

Concept Applied

Apply De Morgan's law to the sum and then the product....

Read Full Step-by-Step Solution →

Question #45

Practice Question

A.Forward breakdown
B.Reverse breakdown
C.Forward bias
D.No bias

Concept Applied

Zener diodes work in reverse breakdown region....

Read Full Step-by-Step Solution →

Question #46

Practice Question

A.0.79 V
B.0.56 V
C.0.95 V
D.1.12 V

Concept Applied

The built‑in potential is $V_{bi}=\frac{kT}{q}\ln\left(\frac{N_A N_D}{n_i^2}\right)$. Computing the ratio $\frac{N_A N_D}{n_i^2}=\frac{(1\times10^{17}...

Read Full Step-by-Step Solution →

Question #47

Practice Question

A.$\bar{A} \cdot \bar{B}$
B.$A \cdot B$
C.$\bar{A} + \bar{B}$
D.$A + B$

Concept Applied

De Morgan's law: $\overline{A + B} = \bar{A} \cdot \bar{B}$. Direct application....

Read Full Step-by-Step Solution →

Question #48

Practice Question

A.10 V
B.20 V
C.5 V
D.14.14 V

Concept Applied

In a center-tapped full-wave rectifier, during the negative half-cycle, one diode is reverse-biased and sees the full voltage across the entire second...

Read Full Step-by-Step Solution →

Question #49

Practice Question

A.p-side connected to +ve terminal
B.n-side connected to +ve terminal
C.no battery connected
D.reverse voltage applied

Concept Applied

Forward bias means p-side to positive, n-side to negative of battery....

Read Full Step-by-Step Solution →

Question #50

Practice Question

Concept Applied

For a full‑wave bridge rectifier, \(V_{avg}=\frac{2V_{p}}{\pi}\). With \(V_{p}=20\) V, \(V_{avg}=\frac{40}{\pi}\approx12.73\) V....

Read Full Step-by-Step Solution →
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