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 type of rectifier is commonly used in series-parallel circuits to convert AC to DC?
A.
Half-wave rectifier
B.
Full-wave rectifier
C.
Bridge rectifier
D.
All of the above
Show solution
Solution
All types of rectifiers can be used in series-parallel circuits depending on the application requirements.
Correct Answer:
D
— All of the above
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Q. What type of rectifier uses a thyristor?
A.
Half-wave rectifier
B.
Full-wave rectifier
C.
Controlled rectifier
D.
Bridge rectifier
Show solution
Solution
Controlled rectifiers utilize thyristors to control the output voltage and current.
Correct Answer:
C
— Controlled rectifier
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Q. What type of rectifier uses both halves of the AC waveform?
A.
Half-wave rectifier
B.
Full-wave rectifier
C.
Bridge rectifier
D.
Zener rectifier
Show solution
Solution
A full-wave rectifier utilizes both halves of the AC waveform to produce a smoother DC output.
Correct Answer:
B
— Full-wave rectifier
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Q. What type of rectifier uses both positive and negative halves of the AC waveform?
A.
Half-wave rectifier
B.
Full-wave rectifier
C.
Bridge rectifier
D.
Zener rectifier
Show solution
Solution
A full-wave rectifier utilizes both halves of the AC waveform, allowing for more efficient conversion to DC compared to a half-wave rectifier.
Correct Answer:
B
— Full-wave rectifier
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Q. When analyzing a parallel circuit with BJTs, the base current is:
A.
Equal to the collector current
B.
Dependent on the emitter current
C.
Independent of the other branches
D.
Always zero
Show solution
Solution
In a parallel circuit with BJTs, the base current is independent of the other branches, as each BJT operates based on its own input.
Correct Answer:
C
— Independent of the other branches
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Q. When analyzing small-signal models in parallel circuits, what is typically assumed about the components?
A.
They are all linear
B.
They are all non-linear
C.
They have infinite resistance
D.
They have zero capacitance
Show solution
Solution
In small-signal models, it is typically assumed that the components are linear to simplify analysis.
Correct Answer:
A
— They are all linear
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Q. Which component is commonly used to implement logic gates in a PLD?
A.
Resistor
B.
Capacitor
C.
Transistor
D.
Inductor
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Solution
Transistors are used to implement logic gates in PLDs, allowing for the creation of complex logic functions.
Correct Answer:
C
— Transistor
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Q. Which component is commonly used to set the gain in a non-inverting op-amp configuration?
A.
Resistor
B.
Capacitor
C.
Inductor
D.
Diode
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Solution
A resistor is commonly used to set the gain in a non-inverting op-amp configuration.
Correct Answer:
A
— Resistor
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Q. Which component is commonly used to smooth out the output of a rectifier?
A.
Resistor
B.
Inductor
C.
Capacitor
D.
Diode
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Solution
A capacitor is commonly used to smooth out the output of a rectifier.
Correct Answer:
C
— Capacitor
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Q. Which component is essential for the operation of a Schmitt trigger?
A.
Resistor
B.
Capacitor
C.
Diode
D.
Op-amp
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Solution
A Schmitt trigger typically uses an operational amplifier to provide hysteresis in the input-output relationship.
Correct Answer:
D
— Op-amp
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Q. Which component is used to control the flow of current in a circuit?
A.
Resistor
B.
Capacitor
C.
Inductor
D.
Transistor
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Solution
A transistor is used to control the flow of current in a circuit, acting as a switch or amplifier.
Correct Answer:
D
— Transistor
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Q. Which component is used to convert an analog signal to a digital signal?
A.
Amplifier
B.
ADC (Analog to Digital Converter)
C.
DAC (Digital to Analog Converter)
D.
Rectifier
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Solution
An ADC converts analog signals into digital signals for processing.
Correct Answer:
B
— ADC (Analog to Digital Converter)
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Q. Which configuration of a BJT is commonly used for voltage amplification?
A.
Common emitter
B.
Common base
C.
Common collector
D.
Emitter follower
Show solution
Solution
The common emitter configuration is widely used for voltage amplification due to its high gain characteristics.
Correct Answer:
A
— Common emitter
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Q. Which configuration of a BJT provides the highest voltage gain?
A.
Common emitter
B.
Common base
C.
Common collector
D.
Emitter follower
Show solution
Solution
The common emitter configuration provides the highest voltage gain among the BJT configurations.
Correct Answer:
A
— Common emitter
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Q. Which configuration of an op-amp can be used to integrate an input signal over time?
A.
Inverting amplifier
B.
Non-inverting amplifier
C.
Integrator
D.
Differential amplifier
Show solution
Solution
An integrator configuration of an op-amp is used to integrate an input signal over time, producing a ramp output.
Correct Answer:
C
— Integrator
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Q. Which configuration of an OP-AMP is commonly used in series-parallel circuits for signal amplification?
A.
Inverting configuration
B.
Non-inverting configuration
C.
Differential configuration
D.
Voltage follower configuration
Show solution
Solution
The non-inverting configuration is commonly used for signal amplification in series-parallel circuits.
Correct Answer:
B
— Non-inverting configuration
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Q. Which configuration of an op-amp is used to create a precision rectifier?
A.
Inverting amplifier
B.
Non-inverting amplifier
C.
Differential amplifier
D.
Voltage follower
Show solution
Solution
An inverting amplifier configuration can be used to create a precision rectifier, allowing for accurate rectification of small signals.
Correct Answer:
A
— Inverting amplifier
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Q. Which configuration of an op-amp is used to perform integration of an input signal?
A.
Inverting amplifier
B.
Non-inverting amplifier
C.
Differentiator
D.
Integrator
Show solution
Solution
An integrator configuration of an op-amp is specifically designed to perform the mathematical operation of integration on the input signal.
Correct Answer:
D
— Integrator
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Q. Which configuration of an operational amplifier provides the highest input impedance?
A.
Inverting
B.
Non-inverting
C.
Voltage follower
D.
Differential
Show solution
Solution
The voltage follower configuration provides the highest input impedance.
Correct Answer:
C
— Voltage follower
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Q. Which device is commonly used to convert AC to DC?
A.
Transistor
B.
Diode
C.
Capacitor
D.
Inductor
Show solution
Solution
A diode is commonly used to convert Alternating Current (AC) to Direct Current (DC) in rectification.
Correct Answer:
B
— Diode
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Q. Which flip-flop is known for its ability to store a single bit of data?
A.
SR Flip-Flop
B.
JK Flip-Flop
C.
D Flip-Flop
D.
T Flip-Flop
Show solution
Solution
The D Flip-Flop is designed to store a single bit of data, capturing the input value on the clock edge.
Correct Answer:
C
— D Flip-Flop
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Q. Which logic gate is represented by a diode in series with a resistor?
A.
AND gate
B.
OR gate
C.
NAND gate
D.
NOR gate
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Solution
A diode in series with a resistor can represent an AND gate, as it allows current to flow only when both inputs are high.
Correct Answer:
A
— AND gate
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Q. Which number system is primarily used in digital electronics?
A.
Decimal
B.
Binary
C.
Octal
D.
Hexadecimal
Show solution
Solution
The binary number system is primarily used in digital electronics as it represents data in two states, 0 and 1.
Correct Answer:
B
— Binary
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Q. Which of the following components is typically used to oppose changes in current?
A.
Capacitor
B.
Resistor
C.
Inductor
D.
Diode
Show solution
Solution
Inductors oppose changes in current due to their property of inductance.
Correct Answer:
C
— Inductor
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Q. Which of the following configurations provides a voltage follower using an op-amp?
A.
Inverting configuration
B.
Non-inverting configuration
C.
Differential configuration
D.
Integrator configuration
Show solution
Solution
A voltage follower is achieved using a non-inverting configuration of an op-amp.
Correct Answer:
B
— Non-inverting configuration
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Q. Which of the following configurations provides the highest input impedance?
A.
Inverting configuration
B.
Non-inverting configuration
C.
Voltage follower
D.
Differential amplifier
Show solution
Solution
The voltage follower configuration provides the highest input impedance.
Correct Answer:
C
— Voltage follower
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Q. Which of the following describes a FET?
A.
It is a current-controlled device
B.
It is a voltage-controlled device
C.
It requires a gate current to operate
D.
It has no gate terminal
Show solution
Solution
A FET (Field Effect Transistor) is a voltage-controlled device that operates by applying voltage to the gate.
Correct Answer:
B
— It is a voltage-controlled device
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Q. Which of the following describes the architecture of a typical FPGA?
A.
Fixed logic gates only
B.
Configurable logic blocks and interconnects
C.
Analog components only
D.
Discrete components only
Show solution
Solution
FPGAs consist of configurable logic blocks and interconnects that allow for flexible circuit design.
Correct Answer:
B
— Configurable logic blocks and interconnects
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Q. Which of the following describes the behavior of an inductor in a DC circuit after a long time?
A.
It acts as a short circuit
B.
It acts as an open circuit
C.
It stores energy
D.
It dissipates energy
Show solution
Solution
After a long time in a DC circuit, an inductor acts as a short circuit.
Correct Answer:
A
— It acts as a short circuit
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Q. Which of the following describes the operation of a thyristor in the 'off' state?
A.
It conducts current freely
B.
It blocks current flow
C.
It amplifies the input signal
D.
It regulates voltage
Show solution
Solution
In the 'off' state, a thyristor blocks current flow until triggered by the gate.
Correct Answer:
B
— It blocks current flow
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