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 primary function of a timer in electronic circuits?
A.
To amplify signals
B.
To measure time intervals
C.
To rectify AC signals
D.
To store data
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Solution
Timers are used in electronic circuits to measure time intervals and generate precise timing signals.
Correct Answer:
B
— To measure time intervals
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Q. What is the primary function of a voltage follower using an op-amp?
A.
To amplify the input voltage
B.
To provide high input impedance and low output impedance
C.
To invert the input signal
D.
To filter high frequencies
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Solution
A voltage follower provides high input impedance and low output impedance, making it ideal for buffering signals.
Correct Answer:
B
— To provide high input impedance and low output impedance
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Q. What is the primary function of an inductor in a circuit?
A.
To store electrical energy in a magnetic field
B.
To convert AC to DC
C.
To amplify signals
D.
To rectify voltage
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Solution
Inductors store electrical energy in a magnetic field when current flows through them.
Correct Answer:
A
— To store electrical energy in a magnetic field
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Q. What is the primary function of an operational amplifier (op-amp) in a circuit?
A.
To amplify voltage
B.
To rectify current
C.
To switch signals
D.
To store energy
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Solution
The primary function of an operational amplifier (op-amp) is to amplify voltage signals.
Correct Answer:
A
— To amplify voltage
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Q. What is the primary purpose of a comparator circuit using an op-amp?
A.
To amplify AC signals
B.
To compare two voltages and output a digital signal
C.
To filter out noise
D.
To provide feedback in a control system
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Solution
A comparator circuit compares two input voltages and outputs a digital signal indicating which input is higher.
Correct Answer:
B
— To compare two voltages and output a digital signal
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Q. What is the primary purpose of a differential amplifier?
A.
To amplify a single input signal
B.
To amplify the difference between two input signals
C.
To filter noise from a signal
D.
To provide isolation between circuits
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Solution
A differential amplifier amplifies the difference between two input signals, making it useful for applications like instrumentation.
Correct Answer:
B
— To amplify the difference between two input signals
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Q. What is the primary purpose of a memory cell in semiconductor memory?
A.
To amplify signals
B.
To store binary data
C.
To convert signals
D.
To regulate voltage
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Solution
The primary purpose of a memory cell in semiconductor memory is to store binary data, which is essential for data retention.
Correct Answer:
B
— To store binary data
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Q. What is the primary purpose of a series voltage regulator?
A.
To increase voltage
B.
To decrease voltage
C.
To maintain a constant output voltage
D.
To convert AC to DC
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Solution
A series voltage regulator is designed to maintain a constant output voltage despite variations in input voltage or load conditions.
Correct Answer:
C
— To maintain a constant output voltage
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Q. What is the primary purpose of an operational amplifier (op-amp)?
A.
To convert AC to DC
B.
To amplify voltage signals
C.
To rectify current
D.
To switch electronic signals
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Solution
Operational amplifiers are designed to amplify voltage signals, making them fundamental components in analog circuits.
Correct Answer:
B
— To amplify voltage signals
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Q. What is the primary purpose of using a voltage divider in a series-parallel circuit?
A.
To increase voltage
B.
To decrease voltage
C.
To isolate components
D.
To amplify signals
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Solution
A voltage divider is used to decrease voltage to a desired level in a circuit.
Correct Answer:
B
— To decrease voltage
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Q. What is the primary reason inductors are used in power supply circuits?
A.
To filter out high frequencies
B.
To store energy
C.
To regulate voltage
D.
To convert AC to DC
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Solution
Inductors are used in power supply circuits primarily to store energy.
Correct Answer:
B
— To store energy
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Q. What is the primary role of a bypass capacitor in a BJT amplifier circuit?
A.
To increase gain
B.
To stabilize the bias point
C.
To filter out noise
D.
To provide AC ground
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Solution
A bypass capacitor provides an AC ground, allowing AC signals to pass while blocking DC.
Correct Answer:
D
— To provide AC ground
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Q. What is the primary role of a capacitor in a rectifier circuit?
A.
To increase the voltage
B.
To filter out AC ripple
C.
To amplify the signal
D.
To switch the circuit on and off
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Solution
In a rectifier circuit, a capacitor is used to filter out AC ripple, smoothing the output DC voltage.
Correct Answer:
B
— To filter out AC ripple
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Q. What is the primary role of a capacitor in an RC circuit?
A.
To resist current flow
B.
To store and release energy
C.
To amplify signals
D.
To convert AC to DC
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Solution
The primary role of a capacitor in an RC circuit is to store and release electrical energy.
Correct Answer:
B
— To store and release energy
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Q. What is the primary role of a digital-to-analog converter (DAC)?
A.
To convert analog signals to digital
B.
To amplify analog signals
C.
To convert digital signals to analog
D.
To filter digital signals
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Solution
A digital-to-analog converter (DAC) converts digital signals into corresponding analog signals for various applications.
Correct Answer:
C
— To convert digital signals to analog
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Q. What is the primary role of a diode in a rectifier circuit?
A.
To amplify current
B.
To allow current to flow in one direction
C.
To store energy
D.
To convert AC to DC
Show solution
Solution
The primary role of a diode in a rectifier circuit is to allow current to flow in one direction.
Correct Answer:
B
— To allow current to flow in one direction
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Q. What is the primary role of a rectifier in a power supply?
A.
To increase voltage
B.
To convert AC to DC
C.
To filter noise
D.
To regulate current
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Solution
The primary role of a rectifier is to convert alternating current (AC) to direct current (DC).
Correct Answer:
B
— To convert AC to DC
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Q. What is the primary role of a rectifier in an AC circuit?
A.
To amplify the AC signal
B.
To convert AC to DC
C.
To filter the AC signal
D.
To generate AC from DC
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Solution
The primary role of a rectifier is to convert alternating current (AC) to direct current (DC).
Correct Answer:
B
— To convert AC to DC
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Q. What is the primary role of a rectifier in power supply circuits?
A.
To increase voltage
B.
To convert AC to DC
C.
To filter noise
D.
To regulate current
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Solution
The primary role of a rectifier is to convert alternating current (AC) into direct current (DC) for use in power supply circuits.
Correct Answer:
B
— To convert AC to DC
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Q. What is the primary role of a resistor in a BJT circuit?
A.
To increase current gain
B.
To limit base current
C.
To provide feedback
D.
To stabilize temperature
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Solution
A resistor in a BJT circuit is primarily used to limit the base current to prevent damage to the transistor.
Correct Answer:
B
— To limit base current
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Q. What is the primary role of a resistor in a circuit?
A.
To store energy
B.
To limit current
C.
To amplify signals
D.
To rectify voltage
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Solution
A resistor is used to limit the flow of current in a circuit.
Correct Answer:
B
— To limit current
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Q. What is the primary role of a voltage divider in a circuit?
A.
To increase voltage
B.
To decrease voltage
C.
To isolate components
D.
To filter signals
Show solution
Solution
A voltage divider is used to decrease voltage to a desired level by using two resistors.
Correct Answer:
B
— To decrease voltage
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Q. What is the primary role of a Zener diode in a circuit?
A.
To rectify AC signals
B.
To amplify signals
C.
To provide voltage regulation
D.
To switch currents
Show solution
Solution
A Zener diode is used primarily for voltage regulation, as it allows current to flow in the reverse direction when a specific reverse voltage is reached.
Correct Answer:
C
— To provide voltage regulation
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Q. What is the primary role of a Zener diode?
A.
To amplify signals
B.
To rectify AC signals
C.
To provide voltage regulation
D.
To switch circuits
Show solution
Solution
Zener diodes are designed to allow current to flow in the reverse direction when a specific reverse voltage is reached, providing voltage regulation.
Correct Answer:
C
— To provide voltage regulation
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Q. What is the primary role of an inductor in an RL circuit?
A.
To resist changes in current
B.
To store electrical energy in a magnetic field
C.
To convert AC to DC
D.
To amplify voltage
Show solution
Solution
An inductor in an RL circuit resists changes in current, storing energy in a magnetic field when current flows through it.
Correct Answer:
B
— To store electrical energy in a magnetic field
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Q. What is the primary role of an operational amplifier in a circuit?
A.
To act as a switch
B.
To amplify voltage signals
C.
To convert AC to DC
D.
To store energy
Show solution
Solution
Operational amplifiers are designed to amplify voltage signals in various applications.
Correct Answer:
B
— To amplify voltage signals
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Q. What is the primary role of the gate terminal in a MOSFET?
A.
To provide power
B.
To control the channel conductivity
C.
To dissipate heat
D.
To connect to the load
Show solution
Solution
The gate terminal in a MOSFET controls the channel conductivity by creating an electric field that modulates the channel.
Correct Answer:
B
— To control the channel conductivity
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Q. What is the primary use of a choke inductor?
A.
To filter out high-frequency signals
B.
To amplify signals
C.
To rectify AC voltage
D.
To store energy
Show solution
Solution
Choke inductors are primarily used to filter out high-frequency signals in power supplies.
Correct Answer:
A
— To filter out high-frequency signals
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Q. What is the primary use of a CPLD in digital circuits?
A.
To amplify signals
B.
To perform simple logic functions
C.
To implement complex algorithms
D.
To store large amounts of data
Show solution
Solution
CPLDs are primarily used to perform simple logic functions in digital circuits.
Correct Answer:
B
— To perform simple logic functions
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Q. What is the primary use of a diode in a PLD?
A.
To amplify signals
B.
To provide logic functions
C.
To isolate different sections
D.
To rectify power supply
Show solution
Solution
Diodes in PLDs are used to provide logic functions by controlling the flow of signals.
Correct Answer:
B
— To provide logic functions
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