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 role of a FET in a series-parallel circuit?
A.
To provide high input impedance
B.
To amplify AC signals only
C.
To act as a current source only
D.
To rectify AC signals
Show solution
Solution
FETs are known for their high input impedance, making them suitable for various applications in series-parallel circuits.
Correct Answer:
A
— To provide high input impedance
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Q. What is the role of a fuse in a programmable logic device?
A.
To amplify signals
B.
To store data
C.
To create permanent connections
D.
To rectify AC signals
Show solution
Solution
Fuses in PLDs are used to create permanent connections in the logic array after programming.
Correct Answer:
C
— To create permanent connections
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Q. What is the role of a Zener diode in a circuit?
A.
To rectify AC signals
B.
To regulate voltage
C.
To amplify signals
D.
To switch circuits
Show solution
Solution
Zener diodes are used for voltage regulation, allowing current to flow in the reverse direction when a specific voltage is reached.
Correct Answer:
B
— To regulate voltage
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Q. What is the role of an FET in a series-parallel circuit?
A.
To provide high input impedance
B.
To increase current flow
C.
To decrease voltage levels
D.
To act as a voltage regulator
Show solution
Solution
FETs are known for their high input impedance, making them suitable for various applications in circuits.
Correct Answer:
A
— To provide high input impedance
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Q. What is the role of an operational amplifier (op-amp) in a memory circuit?
A.
To store data
B.
To amplify voltage signals
C.
To rectify AC signals
D.
To provide a reference voltage
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Solution
Op-amps are used in memory circuits primarily to amplify voltage signals, which is crucial for signal processing.
Correct Answer:
B
— To amplify voltage signals
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Q. What is the role of an operational amplifier (op-amp) in memory circuits?
A.
To store data
B.
To amplify voltage signals
C.
To rectify AC signals
D.
To switch between memory states
Show solution
Solution
Op-amps are used in memory circuits primarily to amplify voltage signals, which is crucial for signal processing.
Correct Answer:
B
— To amplify voltage signals
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Q. What is the role of an operational amplifier in a parallel circuit configuration?
A.
To increase voltage
B.
To amplify current
C.
To provide feedback
D.
To act as a switch
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Solution
An operational amplifier in a parallel circuit configuration is often used to provide feedback, which can stabilize and control the circuit's behavior.
Correct Answer:
C
— To provide feedback
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Q. What is the role of the base-emitter junction in a BJT?
A.
To provide thermal stability
B.
To allow current flow when forward-biased
C.
To block current flow when reverse-biased
D.
To amplify the output signal
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Solution
The base-emitter junction allows current flow when forward-biased, enabling the transistor to operate.
Correct Answer:
B
— To allow current flow when forward-biased
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Q. What is the role of the capacitor in an RC circuit?
A.
To provide a path for DC current
B.
To store and release energy
C.
To amplify the signal
D.
To rectify the signal
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Solution
The capacitor in an RC circuit stores electrical energy and releases it, affecting the timing and filtering characteristics of the circuit.
Correct Answer:
B
— To store and release energy
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Q. What is the role of the collector in a BJT?
A.
To provide biasing
B.
To inject charge carriers
C.
To collect charge carriers
D.
To control the base current
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Solution
The collector in a BJT is responsible for collecting charge carriers from the base region.
Correct Answer:
C
— To collect charge carriers
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Q. What is the role of the inductor in an RLC circuit at resonance?
A.
To store energy in the electric field
B.
To store energy in the magnetic field
C.
To dissipate energy as heat
D.
To block AC signals
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Solution
At resonance, the inductor stores energy in the magnetic field.
Correct Answer:
B
— To store energy in the magnetic field
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Q. What is the role of the magnetic field in a transformer?
A.
To store energy
B.
To induce voltage in the secondary winding
C.
To dissipate heat
D.
To filter signals
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Solution
The magnetic field in a transformer is crucial for inducing voltage in the secondary winding through electromagnetic induction.
Correct Answer:
B
— To induce voltage in the secondary winding
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Q. What is the significance of 'logic density' in PLDs?
A.
It refers to the power consumption
B.
It indicates the number of logic gates per unit area
C.
It measures the speed of operation
D.
It defines the programming time
Show solution
Solution
Logic density refers to the number of logic gates that can be integrated into a given area of the PLD, impacting its complexity and capability.
Correct Answer:
B
— It indicates the number of logic gates per unit area
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Q. What is the significance of the natural frequency (ω_n) in reactive circuits?
A.
It determines the maximum current
B.
It indicates the frequency of oscillation
C.
It affects the voltage drop
D.
It is irrelevant
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Solution
The natural frequency (ω_n) in reactive circuits indicates the frequency at which the system would oscillate if not damped.
Correct Answer:
B
— It indicates the frequency of oscillation
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Q. What is the significance of the time constant in reactive circuits?
A.
It determines the frequency response
B.
It indicates the speed of response
C.
It defines the maximum voltage
D.
It sets the power rating
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Solution
The time constant in reactive circuits indicates the speed of response to changes in voltage or current.
Correct Answer:
B
— It indicates the speed of response
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Q. What is the small-signal model of a diode used for in a series circuit?
A.
To analyze large signal behavior
B.
To simplify AC analysis
C.
To determine power loss
D.
To measure capacitance
Show solution
Solution
The small-signal model of a diode is used to simplify the analysis of AC signals in a series circuit.
Correct Answer:
B
— To simplify AC analysis
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Q. What is the small-signal model of a diode used for in series circuits?
A.
To analyze high-frequency behavior
B.
To determine DC operating points
C.
To simplify AC analysis
D.
To measure voltage drop
Show solution
Solution
The small-signal model of a diode is used to simplify AC analysis in series circuits, allowing for easier calculations of circuit behavior.
Correct Answer:
C
— To simplify AC analysis
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Q. What is the small-signal model used for in analyzing circuits with BJTs?
A.
To determine the DC operating point
B.
To analyze the frequency response
C.
To calculate power dissipation
D.
To measure input impedance
Show solution
Solution
The small-signal model is used to analyze the frequency response of BJTs in circuits.
Correct Answer:
B
— To analyze the frequency response
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Q. What is the small-signal model used for in electronic circuits?
A.
To analyze large signal behavior
B.
To simplify the analysis of linear circuits
C.
To design power supplies
D.
To measure frequency response
Show solution
Solution
The small-signal model is used to simplify the analysis of linear circuits by approximating the behavior of components around a bias point.
Correct Answer:
B
— To simplify the analysis of linear circuits
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Q. What is the small-signal model used for in electronics?
A.
To analyze large signals
B.
To simplify circuit analysis for small variations
C.
To design power supplies
D.
To measure frequency response
Show solution
Solution
The small-signal model simplifies circuit analysis for small variations around a bias point.
Correct Answer:
B
— To simplify circuit analysis for small variations
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Q. What is the small-signal model used for in series circuits?
A.
To analyze large signal behavior
B.
To simplify the analysis of linear circuits
C.
To measure power consumption
D.
To determine frequency response
Show solution
Solution
The small-signal model is used to simplify the analysis of linear circuits by approximating the behavior around a bias point.
Correct Answer:
B
— To simplify the analysis of linear circuits
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Q. What is the term for the loss of energy in a transformer due to heat?
A.
Copper loss
B.
Iron loss
C.
Stray loss
D.
Hysteresis loss
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Solution
Iron loss refers to the energy lost in a transformer due to heat in the core material.
Correct Answer:
B
— Iron loss
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Q. What is the time constant for an RL circuit defined as?
A.
L/R
B.
R/L
C.
L*R
D.
1/(L*R)
Show solution
Solution
The time constant for an RL circuit is defined as L/R, where L is inductance and R is resistance.
Correct Answer:
A
— L/R
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Q. What is the time response of a first-order system characterized by?
A.
Second-order differential equation
B.
First-order differential equation
C.
Zero-order differential equation
D.
Third-order differential equation
Show solution
Solution
The time response of a first-order system is characterized by a first-order differential equation.
Correct Answer:
B
— First-order differential equation
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Q. What is the typical configuration for a BJT used as a switch?
A.
Common base
B.
Common collector
C.
Common emitter
D.
Common drain
Show solution
Solution
The common emitter configuration is typically used for BJTs as switches due to its high gain and ability to control large currents.
Correct Answer:
C
— Common emitter
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Q. What is the typical configuration for small-signal analysis of a FET?
A.
Common emitter
B.
Common collector
C.
Common source
D.
Common gate
Show solution
Solution
The common source configuration is commonly used for small-signal analysis of FETs due to its amplification properties.
Correct Answer:
C
— Common source
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Q. What is the typical configuration of a BJT used for signal amplification?
A.
Common base
B.
Common collector
C.
Common emitter
D.
Common gate
Show solution
Solution
The common emitter configuration is widely used for signal amplification due to its high gain.
Correct Answer:
C
— Common emitter
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Q. What is the typical configuration of a BJT used for switching applications?
A.
Common base
B.
Common emitter
C.
Common collector
D.
Differential pair
Show solution
Solution
The common emitter configuration is commonly used for switching applications due to its high gain and ability to drive loads.
Correct Answer:
B
— Common emitter
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Q. What is the typical configuration of an operational amplifier used for voltage amplification?
A.
Inverting
B.
Non-inverting
C.
Differential
D.
All of the above
Show solution
Solution
Operational amplifiers can be configured in inverting, non-inverting, and differential modes for voltage amplification.
Correct Answer:
D
— All of the above
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Q. What is the typical current gain (beta) range for BJTs?
A.
1 to 10
B.
10 to 100
C.
100 to 1000
D.
1000 to 10000
Show solution
Solution
The typical current gain (beta) for BJTs ranges from 10 to 100.
Correct Answer:
B
— 10 to 100
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