Class 12 Physics MCQ Chapter 14 Semiconductor Electronics
Get exam-ready with our Class 12 Physics MCQ Chapter 14 Semiconductor Electronics English Medium collection, specially crafted for AHSEC Higher Secondary students. This article features a wide range of important multiple-choice questions (MCQs) with answers to help students master the concepts of semiconductor devices and electronic circuits.
The chapter Semiconductor Electronics introduces students to the fundamentals of modern electronics. It covers important topics such as semiconductors, intrinsic and extrinsic semiconductors, p-type and n-type materials, p-n junction diodes, rectifiers, transistors, logic gates, digital circuits, and their practical applications in everyday electronic devices. Understanding these concepts is essential for both board examinations and higher studies in science and technology.
All MCQs are prepared according to the latest AHSEC syllabus and examination pattern, making them highly relevant for effective revision and self-assessment. Regular practice of these objective questions will help students improve conceptual understanding, strengthen analytical skills, and gain confidence in solving exam-oriented questions.
Whether you are preparing for class tests, model exams, or the AHSEC Higher Secondary Final Examination, these Chapter 14 MCQ solutions will serve as a valuable resource for scoring higher marks in Physics.
PART II
Class 12 Physics MCQ Chapter 14 Semiconductor Electronics
VSA & MCQ
I. Very Short Answer Questions
Q. What is a semiconductor?
Ans: A material whose conductivity lies between conductor and insulator.
Q. Give examples of semiconductors.
Ans: Silicon and Germanium.
Q. What is intrinsic semiconductor?
Ans: Pure semiconductor without impurities.
Q. What is extrinsic semiconductor?
Ans: Semiconductor doped with impurities.
Q. What is doping?
Ans: Addition of impurities to increase conductivity.
Q. What are n-type semiconductors?
Ans: Semiconductors with excess electrons.
Q. What are p-type semiconductors?
Ans: Semiconductors with excess holes.
Q. What is a hole?
Ans: Absence of electron acting as positive charge.
Q. What is p-n junction?
Ans: Boundary between p-type and n-type materials.
Q. What is depletion region?
Ans: Region depleted of free charge carriers.
Q. What is barrier potential?
Ans: Potential difference across depletion region.
Q. What is forward bias?
Ans: Connecting p-side to positive terminal.
Q. What is reverse bias?
Ans: Connecting p-side to negative terminal.
Q. What is diode?
Ans: A p-n junction device allowing current in one direction.
Q. What is rectification?
Ans: Conversion of AC to DC.
Q. What is Zener diode?
Ans: Diode used for voltage regulation.
Q. What is breakdown?
Ans: Sudden increase in current in reverse bias.
Q. What is transistor?
Ans: Semiconductor device used for amplification.
Q. Types of transistor?
Ans: p-n-p and n-p-n.
Q. What is current gain?
Ans: Ratio of output current to input current.
Q. What is logic gate?
Ans: Digital circuit performing logical operation.
Q. What is AND gate?
Ans: Output is 1 only if both inputs are 1.
Q. What is OR gate?
Ans: Output is 1 if any input is 1.
Q. What is NOT gate?
Ans: Inverts the input.
Q. What is NAND gate?
Ans: NOT of AND operation.
Q. What is NOR gate?
Ans: NOT of OR operation.
Q. What is universal gate?
Ans: NAND and NOR.
Q. What is LED?
Ans: Light emitting diode.
Q. What is photodiode?
Ans: Diode sensitive to light.
Q. What is solar cell?
Ans: Device converting light into electricity.
II. Multiple Choice Questions
Q. Semiconductor lies between:
(a) Metal and insulator
(b) Gas and solid
(c) Liquid and gas
(d) None
Ans: (a)
Q. Doping increases:
(a) Resistance
(b) Conductivity
(c) Mass
(d) Volume
Ans: (b)
Q. n-type has:
(a) Holes
(b) Electrons
(c) Protons
(d) Neutrons
Ans: (b)
Q. p-type has:
(a) Electrons
(b) Holes
(c) Neutrons
(d) Atoms
Ans: (b)
Q. Diode allows current in:
(a) Both directions
(b) One direction
(c) None
(d) Infinite
Ans: (b)
Q. Zener diode is used for:
(a) Amplification
(b) Rectification
(c) Regulation
(d) Detection
Ans: (c)
Q. Transistor is used for:
(a) Heating
(b) Amplification
(c) Cooling
(d) Lighting
Ans: (b)
Q. AND gate output is 1 when:
(a) One input is 1
(b) Both inputs are 1
(c) Both 0
(d) Any
Ans: (b)
Q. NOT gate output is:
(a) Same
(b) Opposite
(c) Zero
(d) One
Ans: (b)
Q. LED emits:
(a) Heat
(b) Light
(c) Sound
(d) Charge
Ans: (b)
Q. Assertion: Doping increases conductivity. Reason: It increases charge carriers.
(a) Both true, reason correct
(b) Both true, reason incorrect
(c) Assertion true, reason false
(d) Both false
Ans: (b)
Q. Assertion: Depletion region has no charges. Reason: Charges are immobile ions present.
(a) Both true, reason correct
(b) Both true, reason incorrect
(c) Assertion true, reason false
(d) Both false
Ans: (d)
Q. Assertion: Diode conducts in forward bias. Reason: Barrier potential decreases.
(a) Both true, reason correct
(b) Both true, reason incorrect
(c) Assertion true, reason false
(d) Both false
Ans: (c)
Q. Assertion: Transistor amplifies signals. Reason: Small input controls large output.
(a) Both true, reason correct
(b) Both true, reason incorrect
(c) Assertion true, reason false
(d) Both false
Ans: (a)
Q. Assertion: Zener diode works in reverse bias. Reason: Used in breakdown region.
(a) Both true, reason correct
(b) Both true, reason incorrect
(c) Assertion true, reason false
(d) Both false
Ans: (b)
Q. Assertion: NAND is universal gate. Reason: It can form any logic circuit.
(a) Both true, reason correct
(b) Both true, reason incorrect
(c) Assertion true, reason false
(d) Both false
Ans: (c)
Q. Assertion: LED emits light. Reason: Recombination releases energy.
(a) Both true, reason correct
(b) Both true, reason incorrect
(c) Assertion true, reason false
(d) Both false
Ans: (a)
