NeetVictoryQuestion 1: Logic Gates
The expression A · A′ (A and NOT A) always equals:
- A A
- B 1
- C 0
- D A′
Answer: C. 0
Why: A variable and its complement can never both be 1.
NEET Physics: Semiconductor Electronics. Chapter-wise Practice Questions and Test
Semiconductor Electronics is a Class 12 Physics chapter that carries about 5.0% of the Physics questions in NEET. Practise it with 51 questions covering 2 topics, each with an explanation.
Practise Semiconductor Electronics
Open in the appSets of 15 questions that adapt to your level, with an explanation for every answer.
Topics covered in Semiconductor Electronics
- Logic Gates (18 questions)
- PN Junction Diode (33 questions)
How often Semiconductor Electronics has come up in NEET
Across the 13 previous year papers, Semiconductor Electronics had 34 questions, about 2.6 a year. The most in one paper was 3, in NEET 2016.
| Paper | Questions from this chapter |
|---|---|
| NEET 2026 | 3 |
| NEET 2025 | 2 |
| NEET 2024 | 3 |
| NEET 2023 | 3 |
| NEET 2022 | 2 |
| NEET 2021 | 3 |
| NEET 2020 | 3 |
| NEET 2019 | 2 |
| NEET 2018 | 3 |
| NEET 2017 | 3 |
| NEET 2016 | 3 |
| Re-AIPMT 2015 | 2 |
| AIPMT 2014 | 2 |
Sample questions on Semiconductor Electronics with answers
8 questions from the practice bank, spread across the chapter's topics. The full set is in the app.
Question 2: PN Junction Diode
A silicon diode (drop 0.7 V when conducting) is in series with a 100 Ω resistor and a 5.7 V supply. The current is:
- A 50 mA
- B 5 mA
- C 57 mA
- D 0.5 A
Answer: A. 50 mA
Why: I = (5.7 − 0.7)/100 = 0.05 A.
Question 3: Logic Gates
A NAND gate with both of its inputs connected together acts as a:
- A OR gate
- B NOT gate
- C XOR gate
- D AND gate
Answer: B. NOT gate
Why: Y = (A·A)′ = A′.
Question 4: PN Junction Diode
The conductivity of a semiconductor can be increased by:
- A applying a magnetic field
- B using a purer sample only
- C doping it with a small amount of a suitable impurity, or by raising the temperature
- D lowering the temperature
Answer: C. doping it with a small amount of a suitable impurity, or by raising the temperature
Why: Both create more free charge carriers.
Question 5: Logic Gates
A NOT gate (inverter) produces an output that is:
- A always HIGH
- B always LOW
- C the same as the input
- D the complement (opposite) of the input
Answer: D. the complement (opposite) of the input
Why: A NOT gate inverts its input — a HIGH input produces a LOW output and vice versa.
Question 6: PN Junction Diode
A diode used as a switch is:
- A ON when forward biased and OFF when reverse biased
- B always OFF
- C always ON
- D ON when reverse biased
Answer: A. ON when forward biased and OFF when reverse biased
Why: This one-way conduction is the basis of rectification and logic circuits.
Question 7: Logic Gates
The inputs A = 1 and B = 0 are applied to a NAND gate. The output is:
- A 0
- B undefined
- C 1
- D 1 only when B is also 1
Answer: C. 1
Why: The output of a NAND gate is 0 only when both inputs are 1.
Question 8: PN Junction Diode
A half-wave rectifier is fed with AC of 50 Hz. The ripple frequency of its output is:
- A 100 Hz
- B 200 Hz
- C 50 Hz
- D 25 Hz
Answer: C. 50 Hz
Why: There is one pulse per input cycle.
Practise all of Semiconductor Electronics
Open in the appFrequently asked questions
How many questions come from Semiconductor Electronics in NEET?
Semiconductor Electronics carries about 5.0% of the Physics questions in NEET. Across the 13 previous year papers on NeetVictory it appeared 34 times, about 2.6 questions a year.
Which class is Semiconductor Electronics from?
Semiconductor Electronics is a Class 12 Physics chapter in the NCERT syllabus.
Where can I practise Semiconductor Electronics questions for NEET?
NeetVictory has 51 practice questions on Semiconductor Electronics, each with an explanation, in sets of 15 that adapt to your level. This page shows a free sample.