What Are the Main Types and Functions of Electronic Devices in Circuits?
The Electronic Devices MCQ page provides NEET-focused multiple-choice questions on semiconductors, diodes, transistors, and digital circuits. Attempting such MCQs clarifies concepts, sharpens problem-solving, and boosts your NEET Physics score. Mastering this chapter with practice improves accuracy and confidence before exams. Solutions and answer keys help reinforce logic and build strong fundamentals essential for NEET success.
What are MCQs for Electronic Devices?
Electronic Devices MCQs are single-answer questions designed to assess knowledge of semiconductor theory, logic gates, diodes, and basic electronic circuits. Practicing these MCQs builds familiarity with NEET question types and prepares you to tackle both conceptual and numerical problems effectively during the Physics exam.
Why Practice NEET MCQs?
Solving NEET MCQs on Electronic Devices helps assess your readiness, highlights weak areas, and improves your ability to answer quickly and accurately. Practice ensures higher retention, better speed, and understanding of crucial application-based Physics concepts commonly asked in NEET.
Electronic Devices MCQ Practice: 20 NEET-level Questions
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Which of the following is a property of intrinsic semiconductors?
A. Contains no charge carriers
B. Contains equal electrons and holes
C. Contains only holes as carriers
D. Is always an insulator at any temperature
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What is the number of valence electrons in a silicon atom?
A. 2
B. 3
C. 4
D. 5
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Which element is commonly used for making p-type semiconductors?
A. Phosphorus
B. Boron
C. Arsenic
D. Antimony
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What is the major charge carrier in an n-type semiconductor?
A. Holes
B. Positrons
C. Electrons
D. Protons
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Which of the following materials is typically used for fabricating infrared LEDs?
A. Si
B. Ge
C. GaAs
D. C
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As temperature increases, the resistivity of a pure semiconductor:
A. Increases
B. Decreases
C. Remains constant
D. First increases then decreases
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Which one of the following is not a semiconductor?
A. Silicon
B. Germanium
C. Copper
D. Gallium Arsenide
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In a p-n junction diode, current flows under:
A. Zero bias
B. Forward bias
C. Reverse bias
D. Both forward and reverse bias equally
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A Zener diode is typically used as a:
A. Rectifier
B. Voltage regulator
C. Oscillator
D. Amplifier
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Which of the following best defines a transistor?
A. Two-layer, two-junction device
B. Two-layer, one-junction device
C. Three-layer, two-junction device
D. Three-junction device
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In a common-base transistor arrangement, if IE = 2 mA and IB = 20 μA, what is the current gain α?
A. 0.50
B. 0.90
C. 0.99
D. 1.01
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Which type of logic gate gives a high output (1) only when all inputs are high?
A. OR
B. NOR
C. AND
D. XOR
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Which region of a transistor acts as a closed switch?
A. Cutoff
B. Saturation
C. Active
D. Inverse
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In a p-n junction, diffusion potential:
A. Exists only in forward bias
B. Exists only in reverse bias
C. Exists even with no external voltage
D. Never exists
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If a metal has a large number of free electrons, it acts as a:
A. Semiconductor
B. Insulator
C. Conductor
D. Dielectric
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Which biasing is required for a diode to conduct current?
A. Forward bias
B. Reverse bias
C. No bias
D. Both A and B
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Which device converts alternating current to direct current?
A. Oscillator
B. Rectifier
C. Amplifier
D. Modulator
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The band gap of silicon at room temperature is approximately:
A. 0.66 eV
B. 1.12 eV
C. 1.86 eV
D. 2.20 eV
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Which process increases the conductivity of a pure semiconductor?
A. Annealing
B. Doping
C. Etching
D. Oxidation
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Semi-conductor materials like Germanium with controlled doping are especially suited for cryogenic temperature measurements below:
A. 273 K
B. 77 K
C. 25 K
D. 200 K
MCQ Answer Key
| Q.No. | Answer | Explanation |
|---|---|---|
| 1 | B | Intrinsic semiconductors have equal numbers of electrons and holes. |
| 2 | C | Silicon has 4 valence electrons. |
| 3 | B | Boron adds holes in silicon, making it p-type. |
| 4 | C | Electrons are the majority charge carriers in n-type semiconductors. |
| 5 | C | Gallium Arsenide (GaAs) is used for infrared LEDs. |
| 6 | B | Resistivity drops as temperature rises in pure semiconductors. |
| 7 | C | Copper is a metal, not a semiconductor. |
| 8 | B | Current flows easily only under forward bias in diodes. |
| 9 | B | Zener diodes regulate voltage due to precise breakdown voltage. |
| 10 | C | Transistors have three layers and two junctions. |
| 11 | C | IC = IE-IB; α = IC/IE = 1.98/2 = 0.99. |
| 12 | C | AND gate outputs 1 only if all inputs are 1. |
| 13 | B | In saturation, a transistor acts like a closed switch. |
| 14 | C | Diffusion potential exists naturally at the p-n junction. |
| 15 | C | Conductors have many free electrons. |
| 16 | A | Forward bias enables current through a diode. |
| 17 | B | Rectifiers convert AC to DC using diodes. |
| 18 | B | Silicon’s band gap is about 1.12 eV. |
| 19 | B | Doping introduces impurities, increasing charge carriers. |
| 20 | C | Doped Germanium measures temperatures especially well below 25 K. |
Explanations clarify reasoning behind each answer and help students understand important NEET concepts.
How These Electronic Devices MCQs Help in NEET
Practicing Electronic Devices MCQs improves conceptual clarity, application skills, and time management for NEET Physics. Regular MCQ practice identifies common mistakes, enhances exam confidence, and prepares you for both direct and tricky questions from this high-weightage chapter. Use answer keys for self-correction and efficient revision.
More NEET Physics Practice & Tips
- For focused revision, practice more Semiconductors MCQs and Digital Electronics MCQs.
- Attempt full-length NEET Physics mock tests to simulate the actual exam.
- Review past NEET Physics questions via previous year papers.
Practicing these Electronic Devices MCQs gives you a real exam feel, boosts NEET accuracy, and clarifies critical Physics concepts. Consistent Vedantu MCQ practice is the best way to master scoring topics and outperform in the NEET Physics section. Keep practising and reviewing solutions for continuous improvement and success in NEET 2025.
FAQs on Electronic Devices Mcq: Key Concepts and Practice Questions
1. What is included in the NEET Physics Mock Test: Electronic Devices?
The NEET Physics Mock Test: Electronic Devices includes 20 exam-focused MCQs covering all important topics in the chapter. Key features are:
- Semiconductor theory, diodes, transistors, and digital circuits MCQs
- Instant answer key and detailed solutions
- Performance analytics to track score and progress
- Curated for NEET 2025 syllabus alignment and exam trends
2. Can I get solutions for the Electronic Devices MCQs?
Yes, you receive detailed answer keys and step-by-step solutions for all Electronic Devices MCQs instantly after you submit the test. These explanations help you:
- Understand important concepts
- Correct common mistakes
- Learn NEET-standard logic and shortcuts
3. How can chapterwise practice help me score higher in NEET Physics?
Chapterwise MCQ practice boosts your NEET Physics score by improving topic understanding and speed. Benefits include:
- Focused revision of high-yield chapters like Electronic Devices
- Identification of weak areas and frequent mistakes
- Better time management and exam confidence
- Higher accuracy in NEET objective questions
4. Does the test follow the NEET 2025 Physics syllabus and pattern?
Yes, all questions are based on the NEET 2025 Physics syllabus and follow current exam patterns:
- MCQs with four options and one correct answer
- Recent NEET Physics trends and question levels
- Weightage on semiconductors, diodes, transistors, and logic circuits
5. Is there any time limit for the Electronic Devices NEET mock test?
You are recommended to complete the Electronic Devices NEET mock test in 20–25 minutes to simulate real exam conditions, improve time management, and build exam speed.
6. What are common mistakes students make in Electronic Devices MCQs?
Common mistakes in Electronic Devices MCQs include:
- Confusing the direction of current in diodes
- Mixing up NPN and PNP transistor logic
- Miscalculating input/output for logic gates
- Ignoring circuit symbols or operational conditions
7. How can I analyze my NEET Physics mock test performance for weak topics?
Use the test analytics tools to identify which Electronic Devices concepts you get wrong most often. Steps include:
- Review incorrect answers and solution explanations
- Check topic-wise accuracy scores
- Prioritize revision of weak subtopics before your next attempt
8. What is the weightage of Electronic Devices in NEET Physics 2025?
The Electronic Devices chapter typically carries 4–5 MCQs, amounting to about 16–20 marks in recent NEET Physics sections. Regular practice in this topic is crucial for boosting your overall Physics score.
9. Should I guess unanswered MCQs in this practice test?
It's a good idea to attempt every MCQ, as there is no negative marking for unanswered questions in the practice test. Review all solution explanations to learn from both correct and incorrect guesses.
10. How does regular mock testing reduce exam stress for NEET?
Regular mock tests help reduce exam stress by making you familiar with NEET Physics question patterns and timing. Benefits include:
- Increased confidence and speed
- Less anxiety about tricky questions
- Practice in maintaining focus and accuracy under timed conditions
11. What are the key topics covered in Electronic Devices NEET mock test?
The Electronic Devices NEET mock test includes all major subtopics:
- Semiconductor theory: intrinsic/extrinsic semiconductors, doping, Fermi levels
- Diodes: PN junction, Zener diode, rectifiers
- Transistors: CB/CE/CC configurations, input/output characteristics
- Logic circuits: logic gates, truth tables, simple digital circuits
12. Which section of Electronic Devices carries more marks in NEET Physics?
In NEET Physics, Semiconductor Theory and Diodes consistently carry the most marks from Electronic Devices. Focus on:
- Basic working principles and application circuits
- Calculation-based questions on energy bands and diode current
