Electronics MCQ & Objective Questions
Electronics is a crucial subject for students preparing for school exams and competitive tests in India. Mastering this topic not only enhances your understanding of fundamental concepts but also boosts your confidence in tackling objective questions. Practicing MCQs and important questions in Electronics helps you identify your strengths and weaknesses, ensuring effective exam preparation.
What You Will Practise Here
Basic concepts of current, voltage, and resistance
Understanding of Ohm's Law and its applications
Key components such as resistors, capacitors, and transistors
Fundamentals of circuit diagrams and analysis
Principles of alternating current (AC) and direct current (DC)
Signal processing and its applications in real-world scenarios
Important formulas related to power, energy, and circuit calculations
Exam Relevance
Electronics is a significant topic in various examinations, including CBSE, State Boards, NEET, and JEE. Students can expect questions that assess their understanding of basic concepts, circuit analysis, and application of theories. Common question patterns include multiple-choice questions that test both theoretical knowledge and practical application, making it essential to practice thoroughly.
Common Mistakes Students Make
Confusing the concepts of AC and DC, leading to incorrect answers.
Overlooking the significance of units in calculations, resulting in errors.
Misinterpreting circuit diagrams, which can lead to faulty analysis.
Neglecting to apply Ohm's Law correctly in problem-solving.
FAQs
Question: What are the key topics to focus on in Electronics for exams?Answer: Focus on circuit analysis, basic components, Ohm's Law, and signal processing.
Question: How can I improve my performance in Electronics MCQs?Answer: Regular practice of MCQs and understanding the underlying concepts will significantly enhance your performance.
Don't wait any longer! Dive into our Electronics MCQs and practice questions to solidify your understanding and excel in your exams. Your success starts with the right preparation!
Q. What is the typical frequency of household AC in the United States?
A.
50 Hz
B.
60 Hz
C.
100 Hz
D.
120 Hz
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Solution
The typical frequency of household AC in the United States is 60 Hz.
Correct Answer:
B
— 60 Hz
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Q. What is the typical input impedance of a BJT in common-emitter configuration?
A.
Low
B.
Medium
C.
High
D.
Very high
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Solution
The typical input impedance of a BJT in common-emitter configuration is medium, allowing for reasonable signal coupling.
Correct Answer:
B
— Medium
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Q. What is the typical input impedance of a BJT in the common-emitter configuration?
A.
Low
B.
Medium
C.
High
D.
Very high
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Solution
The typical input impedance of a BJT in the common-emitter configuration is medium.
Correct Answer:
B
— Medium
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Q. What is the typical input impedance of a FET compared to a BJT?
A.
Higher
B.
Lower
C.
Equal
D.
Variable
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Solution
FETs typically have a much higher input impedance compared to BJTs, making them suitable for high-impedance applications.
Correct Answer:
A
— Higher
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Q. What is the typical input impedance of an ideal op-amp?
A.
Zero ohms
B.
Infinite ohms
C.
1000 ohms
D.
10,000 ohms
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Solution
An ideal op-amp has infinite input impedance, which prevents loading the input signal.
Correct Answer:
B
— Infinite ohms
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Q. What is the typical open-loop gain of an ideal op-amp?
A.
1
B.
10
C.
1000
D.
Infinity
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Solution
An ideal op-amp has an open-loop gain that approaches infinity.
Correct Answer:
D
— Infinity
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Q. What is the typical open-loop gain of an operational amplifier?
A.
1
B.
10
C.
100
D.
100,000
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Solution
The typical open-loop gain of an operational amplifier can be around 100,000 or more.
Correct Answer:
D
— 100,000
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Q. What is the typical output impedance of a FET in the saturation region?
A.
Low
B.
High
C.
Zero
D.
Variable
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Solution
FETs in the saturation region exhibit high output impedance, making them suitable for voltage amplification.
Correct Answer:
B
— High
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Q. What is the typical output impedance of an ideal op-amp?
A.
Zero ohms
B.
Infinite ohms
C.
100 ohms
D.
1 kilo-ohm
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Solution
An ideal operational amplifier has infinite output impedance, allowing it to drive loads without affecting the output voltage.
Correct Answer:
B
— Infinite ohms
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Q. What is the typical voltage drop across a silicon diode when it is conducting?
A.
0.1V
B.
0.3V
C.
0.7V
D.
1.5V
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Solution
A silicon diode typically has a forward voltage drop of about 0.7V when it is conducting.
Correct Answer:
C
— 0.7V
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Q. What is the typical voltage drop across a silicon diode when it is forward-biased?
A.
0.2V
B.
0.7V
C.
1.2V
D.
1.5V
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Solution
A silicon diode typically has a forward voltage drop of about 0.7V when conducting.
Correct Answer:
B
— 0.7V
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Q. What is the typical voltage gain of an ideal operational amplifier?
A.
1
B.
0
C.
Infinity
D.
10
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Solution
An ideal operational amplifier has an infinite voltage gain, meaning it can amplify a small input voltage to a much larger output voltage.
Correct Answer:
C
— Infinity
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Q. What is the unit of charge?
A.
Coulomb
B.
Ampere
C.
Volt
D.
Ohm
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Solution
The unit of charge is Coulomb, which quantifies the amount of electric charge.
Correct Answer:
A
— Coulomb
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Q. What is the unit of current?
A.
Volt
B.
Ohm
C.
Ampere
D.
Watt
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Solution
The unit of current is Ampere, which measures the flow of electric charge.
Correct Answer:
C
— Ampere
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Q. What is the unit of energy?
A.
Joule
B.
Watt
C.
Volt
D.
Coulomb
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Solution
The unit of energy is Joule, which quantifies the amount of work done.
Correct Answer:
A
— Joule
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Q. What is the unit of power?
A.
Watt
B.
Volt
C.
Ampere
D.
Ohm
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Solution
The unit of power is Watt, which measures the rate of energy transfer.
Correct Answer:
A
— Watt
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Q. What is the unit of resistance in Ohm's Law?
A.
Volts
B.
Amperes
C.
Ohms
D.
Watts
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Solution
The unit of resistance in Ohm's Law is Ohms, symbolized by the Greek letter Omega (Ω).
Correct Answer:
C
— Ohms
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Q. What is the unit of time constant?
A.
Seconds
B.
Ohms
C.
Farads
D.
Henries
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Solution
The time constant is measured in seconds, representing the time it takes for the circuit to respond.
Correct Answer:
A
— Seconds
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Q. What is the unit of voltage?
A.
Coulomb
B.
Ohm
C.
Volt
D.
Farad
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Solution
The unit of voltage is Volt, which measures the electric potential difference.
Correct Answer:
C
— Volt
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Q. What is the waveform shape of Alternating Current (AC)?
A.
Square wave
B.
Sine wave
C.
Triangular wave
D.
Constant wave
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Solution
The waveform shape of Alternating Current (AC) is typically a sine wave.
Correct Answer:
B
— Sine wave
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Q. What is the waveform shape of Alternating Current?
A.
Square wave
B.
Sine wave
C.
Triangular wave
D.
Constant voltage
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Solution
The waveform shape of Alternating Current (AC) is typically a sine wave.
Correct Answer:
B
— Sine wave
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Q. What type of capacitor is commonly used for high-frequency applications?
A.
Electrolytic capacitor
B.
Ceramic capacitor
C.
Tantalum capacitor
D.
Film capacitor
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Solution
Ceramic capacitors are preferred for high-frequency applications due to their low inductance.
Correct Answer:
B
— Ceramic capacitor
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Q. What type of core material is commonly used in transformers?
A.
Air
B.
Copper
C.
Silicon steel
D.
Aluminum
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Solution
Silicon steel is commonly used as the core material in transformers due to its magnetic properties.
Correct Answer:
C
— Silicon steel
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Q. What type of device is a BJT?
A.
Voltage-controlled device
B.
Current-controlled device
C.
Temperature-controlled device
D.
Frequency-controlled device
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Solution
A BJT (Bipolar Junction Transistor) is a current-controlled device.
Correct Answer:
B
— Current-controlled device
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Q. What type of FET is commonly used for switching applications?
A.
JFET
B.
MOSFET
C.
BJT
D.
IGBT
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Solution
MOSFETs are widely used in switching applications due to their high efficiency and fast switching speeds.
Correct Answer:
B
— MOSFET
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Q. What type of inductor is commonly used in RF applications?
A.
Air core inductor
B.
Iron core inductor
C.
Ferrite core inductor
D.
Water core inductor
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Solution
Air core inductors are commonly used in RF applications due to their low losses.
Correct Answer:
A
— Air core inductor
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Q. What type of logic function can be implemented using a PLD?
A.
Only AND functions
B.
Only OR functions
C.
Any combinational logic function
D.
Only sequential logic functions
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Solution
PLDs can implement any combinational logic function, making them versatile for various applications.
Correct Answer:
C
— Any combinational logic function
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Q. What type of rectifier allows current to flow in both directions but only during one half of the AC cycle?
A.
Full-wave rectifier
B.
Half-wave rectifier
C.
Bridge rectifier
D.
Zener rectifier
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Solution
A half-wave rectifier allows current to flow only during one half of the AC cycle, blocking the other half.
Correct Answer:
B
— Half-wave rectifier
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Q. What type of rectifier allows current to flow in only one direction?
A.
Zener rectifier
B.
Half-wave rectifier
C.
Full-wave rectifier
D.
Bridge rectifier
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Solution
A half-wave rectifier allows current to flow in only one direction, blocking the reverse current.
Correct Answer:
B
— Half-wave rectifier
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Q. What type of rectifier is commonly used in power supply circuits for semiconductor memory?
A.
Half-wave rectifier
B.
Full-wave rectifier
C.
Bridge rectifier
D.
Zener rectifier
Show solution
Solution
Bridge rectifiers are commonly used in power supply circuits for semiconductor memory as they provide full-wave rectification.
Correct Answer:
C
— Bridge rectifier
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