Semiconductor Electronics Practice Questions
Class 12 · Physics · 2526 free MCQs with instant results and detailed explanations.
2526
Total
807
Easy
1263
Medium
456
Hard
Start Practicing Semiconductor Electronics
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Topics in Semiconductor Electronics
Logic Gates
566
p-n Junction
670
Transistor
577
Diode
713
Sample Questions from Semiconductor Electronics
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What is the main function of a p-n junction diode?
A.
To allow current to flow in both directions
B.
To allow current to flow in one direction
C.
To block all current flow
D.
To increase voltage output
Show Answer & Explanation
Correct Answer: B
A p-n junction diode allows current to flow only in one direction due to the formation of a depletion region at the junction, making it a fundamental component in rectification.
Q2
Easy
When a p-n junction diode is reverse-biased, what happens to the depletion region?
A.
It decreases in width
B.
It increases in width
C.
It remains the same
D.
It disappears completely
Show Answer & Explanation
Correct Answer: B
In reverse bias, the applied voltage widens the depletion region as more charge carriers are pulled away from the junction, enhancing the barrier for current flow.
Q3
Easy
What type of charge carriers are majority carriers in a p-type semiconductor?
A.
Electrons
B.
Holes
C.
Both electrons and holes
D.
Ions
Show Answer & Explanation
Correct Answer: B
In a p-type semiconductor, holes are the majority carriers as they are formed by the absence of electrons due to doping with acceptor impurities.
Q4
Medium
What is the main function of a p-n junction diode?
A.
To amplify current
B.
To rectify current
C.
To generate electricity
D.
To store charge
Show Answer & Explanation
Correct Answer: B
A p-n junction diode primarily allows current to pass in one direction, acting as a rectifier.
Q5
Medium
In a p-n junction, what type of charge carriers are predominant in the p-type region?
A.
Electrons
B.
Holes
C.
Ions
D.
Neutrons
Show Answer & Explanation
Correct Answer: B
In a p-type semiconductor, holes are the majority charge carriers due to the presence of acceptor impurities.
Q6
Medium
What happens to the width of the depletion region in a p-n junction diode when reverse voltage is applied?
A.
It decreases
B.
It remains constant
C.
It increases
D.
It fluctuates
Show Answer & Explanation
Correct Answer: C
Applying reverse voltage increases the width of the depletion region as more charge carriers are pulled away from the junction.
Q7
Medium
Which of the following characteristics describes the forward bias condition of a p-n junction?
A.
High resistance
B.
Allows current to flow
C.
Increases the depletion width
D.
Creates a potential barrier
Show Answer & Explanation
Correct Answer: B
In forward bias, the p-type is connected to the positive terminal and n-type to the negative, allowing current to flow easily.
Q8
Hard
When a p-n junction is forward biased, the potential barrier is reduced. What is the typical forward voltage for silicon diodes?
A.
0.3V
B.
0.7V
C.
1.2V
D.
1.5V
Show Answer & Explanation
Correct Answer: B
Silicon diodes typically have a forward bias voltage drop of about 0.7V due to the potential barrier.
Q9
Hard
What happens to the width of the depletion region in a p-n junction when reverse bias is applied?
A.
It decreases
B.
It remains constant
C.
It increases
D.
It becomes zero
Show Answer & Explanation
Correct Answer: C
Applying reverse bias increases the electric field, causing the depletion region to widen as more charge carriers are pulled away.
Q10
Hard
Which of the following materials is commonly used to form a p-n junction?
A.
Copper
B.
Silicon
C.
Aluminum
D.
Iron
Show Answer & Explanation
Correct Answer: B
Silicon is the most widely used semiconductor material for forming p-n junctions due to its favorable properties.
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Semiconductor Electronics — Class 12 Physics Practice Questions Online
This page contains 2526 practice MCQs for the chapter Semiconductor Electronics in Class 12 Physics. The questions are organized by difficulty — 807 easy, 1263 medium, 456 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 4 topics, giving you comprehensive coverage of the entire chapter.