Electronic Devices MCQ & Objective Questions
Understanding electronic devices is crucial for students preparing for school exams and competitive tests. These devices form the backbone of modern technology and are frequently featured in exam syllabi. Practicing MCQs and objective questions on electronic devices not only enhances your knowledge but also boosts your confidence, helping you score better in your exams. Dive into our collection of practice questions to master this essential topic!
What You Will Practise Here
Fundamentals of electronic devices and their classifications
Key concepts of diodes, transistors, and integrated circuits
Important formulas related to current, voltage, and resistance
Definitions of key terms like semiconductor, conductor, and insulator
Diagrams illustrating circuit designs and device functionalities
Theory on the working principles of various electronic components
Applications of electronic devices in real-world scenarios
Exam Relevance
The topic of electronic devices is integral to the curriculum of CBSE, State Boards, NEET, and JEE. Students can expect questions that test their understanding of basic concepts, device functionalities, and practical applications. Common question patterns include multiple-choice questions that assess both theoretical knowledge and problem-solving skills, making it essential to be well-prepared with important electronic devices questions for exams.
Common Mistakes Students Make
Confusing the functions of different types of diodes and transistors
Misunderstanding the relationship between voltage, current, and resistance
Overlooking the significance of circuit diagrams in problem-solving
Failing to apply theoretical concepts to practical scenarios
FAQs
Question: What are the most important electronic devices to study for exams?Answer: Focus on diodes, transistors, and operational amplifiers, as they are frequently tested in various exams.
Question: How can I improve my understanding of electronic devices?Answer: Regular practice with MCQs and objective questions will help reinforce your concepts and improve retention.
Don't wait! Start solving our Electronic Devices MCQ questions today and test your understanding. With consistent practice, you can master this topic and excel in your exams!
Q. What is the primary function of an operational amplifier in a circuit?
A.
To amplify voltage signals
B.
To convert AC to DC
C.
To act as a switch
D.
To store electrical energy
Show solution
Solution
Operational amplifiers are primarily used to amplify voltage signals in various applications.
Correct Answer:
A
— To amplify voltage signals
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Q. What is the primary function of an operational amplifier?
A.
To rectify AC signals
B.
To amplify voltage signals
C.
To switch electronic devices
D.
To store energy
Show solution
Solution
The primary function of an operational amplifier is to amplify voltage signals.
Correct Answer:
B
— To amplify voltage signals
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Q. What is the primary purpose of a summing amplifier?
A.
To amplify a single input
B.
To sum multiple input voltages
C.
To filter signals
D.
To convert signals
Show solution
Solution
A summing amplifier is designed to sum multiple input voltages into a single output voltage.
Correct Answer:
B
— To sum multiple input voltages
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Q. What is the primary purpose of a Zener diode?
A.
To rectify AC signals
B.
To regulate voltage
C.
To amplify signals
D.
To switch currents
Show solution
Solution
A Zener diode is primarily 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 primary role of a gate in a MOSFET?
A.
To control the current flow
B.
To amplify the signal
C.
To provide thermal stability
D.
To rectify the voltage
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Solution
The gate in a MOSFET controls the current flow between the drain and source by applying a voltage.
Correct Answer:
A
— To control the current flow
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Q. What is the primary role of a rectifier in communication systems?
A.
To amplify signals
B.
To convert AC to DC
C.
To modulate signals
D.
To filter noise
Show solution
Solution
Rectifiers convert alternating current (AC) signals into direct current (DC) for further processing.
Correct Answer:
B
— To convert AC to DC
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Q. What is the primary role of the gate in a MOSFET?
A.
To control the current flow
B.
To provide thermal stability
C.
To amplify signals
D.
To rectify AC signals
Show solution
Solution
The gate of a MOSFET controls the current flow between the drain and source by applying a voltage.
Correct Answer:
A
— To control the current flow
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Q. What is the primary use of a Zener diode?
A.
Rectification
B.
Voltage regulation
C.
Signal amplification
D.
Switching
Show solution
Solution
Zener diodes are primarily used for voltage regulation in circuits, allowing current to flow in the reverse direction when a specific voltage is reached.
Correct Answer:
B
— Voltage regulation
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Q. What is the primary use of an operational amplifier (op-amp) in circuits?
A.
To act as a switch
B.
To amplify voltage signals
C.
To rectify AC signals
D.
To store charge
Show solution
Solution
Operational amplifiers are primarily used to amplify voltage signals in various applications.
Correct Answer:
B
— To amplify voltage signals
Learn More →
Q. What is the primary use of an operational amplifier (op-amp)?
A.
To rectify AC signals
B.
To amplify voltage signals
C.
To switch electronic devices
D.
To store charge
Show solution
Solution
An operational amplifier (op-amp) is primarily used to amplify voltage signals in various electronic circuits.
Correct Answer:
B
— To amplify voltage signals
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Q. What is the purpose of a bypass capacitor in an operational amplifier circuit?
A.
To increase gain
B.
To filter noise
C.
To stabilize voltage
D.
To reduce power consumption
Show solution
Solution
A bypass capacitor is used to filter out noise and stabilize the voltage in an operational amplifier circuit.
Correct Answer:
B
— To filter noise
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Q. What is the purpose of a rectifier in a power supply?
A.
To increase voltage
B.
To convert AC to DC
C.
To filter noise
D.
To amplify signals
Show solution
Solution
Rectifiers are used to convert alternating current (AC) to direct current (DC) in power supply circuits.
Correct Answer:
B
— To convert AC to DC
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Q. What is the purpose of a rectifier in electronic circuits?
A.
To amplify signals
B.
To convert AC to DC
C.
To filter noise
D.
To store energy
Show solution
Solution
The primary purpose of a rectifier is to convert alternating current (AC) to direct current (DC).
Correct Answer:
B
— To convert AC to DC
Learn More →
Q. What is the purpose of a rectifier?
A.
To amplify signals
B.
To convert AC to DC
C.
To filter noise
D.
To switch currents
Show solution
Solution
A rectifier converts alternating current (AC) to direct current (DC), which is essential for many electronic devices.
Correct Answer:
B
— To convert AC to DC
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Q. What is the purpose of a small-signal model in electronics?
A.
To analyze large signal behavior
B.
To simplify the analysis of linear circuits
C.
To design power amplifiers
D.
To measure frequency response
Show solution
Solution
A 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 purpose of an operational amplifier (op-amp) in a circuit?
A.
To convert AC to DC
B.
To amplify voltage signals
C.
To act as a switch
D.
To store charge
Show solution
Solution
An operational amplifier is primarily used to amplify voltage signals in various applications.
Correct Answer:
B
— To amplify voltage signals
Learn More →
Q. What is the purpose of an operational amplifier (op-amp)?
A.
To convert AC to DC
B.
To amplify voltage signals
C.
To rectify signals
D.
To switch circuits
Show solution
Solution
An operational amplifier is primarily used to amplify voltage signals in various applications.
Correct Answer:
B
— To amplify voltage signals
Learn More →
Q. What is the purpose of feedback in an operational amplifier circuit?
A.
To increase gain
B.
To stabilize the output
C.
To reduce power consumption
D.
To eliminate noise
Show solution
Solution
Feedback is used in operational amplifier circuits to stabilize the output and control the gain.
Correct Answer:
B
— To stabilize the output
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Q. What is the purpose of negative feedback in an operational amplifier circuit?
A.
Increase gain
B.
Stabilize gain
C.
Reduce bandwidth
D.
Increase distortion
Show solution
Solution
Negative feedback is used to stabilize the gain of an operational amplifier and improve linearity.
Correct Answer:
B
— Stabilize gain
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Q. What is the purpose of small-signal models in communication systems?
A.
To analyze large signal behavior
B.
To simplify the analysis of linear circuits
C.
To design power amplifiers
D.
To measure frequency response
Show solution
Solution
Small-signal models simplify the analysis of linear circuits by allowing the use of linear approximations.
Correct Answer:
B
— To simplify the analysis of linear circuits
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Q. What is the small-signal model used for in transistor circuits?
A.
To analyze large signal behavior
B.
To simplify the analysis of AC signals
C.
To determine thermal stability
D.
To calculate power dissipation
Show solution
Solution
The small-signal model is used to simplify the analysis of AC signals in transistor circuits.
Correct Answer:
B
— To simplify the analysis of AC signals
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Q. What is the typical configuration for a common-emitter BJT amplifier?
A.
Input at collector, output at emitter
B.
Input at base, output at collector
C.
Input at emitter, output at base
D.
Input at collector, output at base
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Solution
In a common-emitter configuration, the input is applied at the base and the output is taken from the collector.
Correct Answer:
B
— Input at base, output at collector
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Q. What is the typical configuration for 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 various ways, including inverting, non-inverting, and differential configurations for voltage amplification.
Correct Answer:
D
— All of the above
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Q. What is the typical configuration of a common emitter BJT amplifier?
A.
Input at collector, output at emitter
B.
Input at base, output at collector
C.
Input at emitter, output at base
D.
Input at collector, output at base
Show solution
Solution
In a common emitter configuration, the input signal is applied to the base and the output is taken from the collector, providing voltage gain.
Correct Answer:
B
— Input at base, output at collector
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Q. What is the typical configuration used for a common-emitter BJT amplifier?
A.
Input at the emitter, output at the collector
B.
Input at the base, output at the collector
C.
Input at the collector, output at the emitter
D.
Input at the base, output at the emitter
Show solution
Solution
In a common-emitter BJT amplifier, the input is applied at the base and the output is taken from the collector.
Correct Answer:
B
— Input at the base, output at the collector
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Q. What is the typical forward voltage drop of a silicon diode?
A.
0.2V
B.
0.7V
C.
1.5V
D.
2.0V
Show solution
Solution
The typical forward voltage drop of a silicon diode is approximately 0.7V when it is conducting.
Correct Answer:
B
— 0.7V
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Q. What is the typical input impedance of an ideal operational amplifier?
A.
0 Ohms
B.
1 kOhm
C.
1 MOhm
D.
Infinity
Show solution
Solution
An ideal operational amplifier has infinite input impedance, meaning it draws no current from the input source.
Correct Answer:
D
— Infinity
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Q. What is the typical output impedance of an ideal operational amplifier?
A.
0 Ohms
B.
1 kOhm
C.
1 MOhm
D.
Infinity
Show solution
Solution
An ideal operational amplifier has zero output impedance, allowing it to drive loads without voltage drop.
Correct Answer:
A
— 0 Ohms
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Q. What type of rectifier allows current to flow during both halves of the AC cycle?
A.
Half-wave rectifier
B.
Full-wave rectifier
C.
Bridge rectifier
D.
Zener rectifier
Show solution
Solution
A full-wave rectifier allows current to flow during both halves of the AC cycle, providing a smoother output.
Correct Answer:
B
— Full-wave rectifier
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Q. What type of rectifier allows current to flow in both directions during different cycles?
A.
Half-wave rectifier
B.
Full-wave rectifier
C.
Bridge rectifier
D.
Zener rectifier
Show solution
Solution
A full-wave rectifier allows current to flow in both directions during different cycles, effectively utilizing both halves of the AC waveform.
Correct Answer:
B
— Full-wave rectifier
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