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 function of a rectifier in an electronic circuit?
A.
To amplify signals
B.
To convert AC to DC
C.
To filter noise
D.
To switch currents
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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 function of a rectifier?
A.
To amplify AC signals
B.
To convert AC to DC
C.
To filter noise
D.
To switch signals
Show solution
Solution
A rectifier's primary function 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 function of an operational amplifier (op-amp)?
A.
To rectify AC signals
B.
To amplify voltage signals
C.
To switch electronic signals
D.
To store charge
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Solution
An operational amplifier (op-amp) is designed to amplify voltage signals, making it a fundamental building block in analog electronics.
Correct Answer:
B
— To amplify voltage signals
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Q. What is the function of an operational amplifier?
A.
To rectify AC signals
B.
To amplify voltage signals
C.
To switch electronic signals
D.
To store charge
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Solution
An operational amplifier is designed to amplify voltage signals, making it a fundamental component in analog circuits.
Correct Answer:
B
— To amplify voltage signals
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Q. What is the ideal open-loop gain of an operational amplifier?
A.
1
B.
100
C.
1000
D.
Infinity
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Solution
The ideal open-loop gain of an operational amplifier is considered to be infinity.
Correct Answer:
D
— Infinity
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Q. What is the input impedance characteristic of a FET?
A.
Low input impedance
B.
High input impedance
C.
Variable input impedance
D.
Zero input impedance
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Solution
FETs are known for their high input impedance, which makes them suitable for use in high-impedance applications.
Correct Answer:
B
— High input impedance
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Q. What is the main advantage of using a FET over a BJT?
A.
Higher current gain
B.
Lower input impedance
C.
Higher input impedance
D.
Better thermal stability
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Solution
Field Effect Transistors (FETs) have a higher input impedance compared to BJTs, making them suitable for high-impedance applications.
Correct Answer:
C
— Higher input impedance
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Q. What is the main advantage of using a MOSFET over a BJT?
A.
Higher current handling
B.
Lower power consumption
C.
Better linearity
D.
Higher voltage ratings
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Solution
MOSFETs typically have lower power consumption due to their voltage-driven operation compared to current-driven BJTs.
Correct Answer:
B
— Lower power consumption
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Q. What is the main advantage of using a Schottky diode?
A.
Higher reverse voltage
B.
Lower forward voltage drop
C.
Higher current rating
D.
Better thermal stability
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Solution
Schottky diodes have a lower forward voltage drop compared to standard diodes, making them efficient for high-speed applications.
Correct Answer:
B
— Lower forward voltage drop
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Q. What is the main advantage of using FETs in modulation circuits?
A.
Higher power handling
B.
Lower noise levels
C.
Higher gain
D.
Better thermal stability
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Solution
FETs generally have lower noise levels compared to BJTs, making them suitable for modulation.
Correct Answer:
B
— Lower noise levels
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Q. What is the main advantage of using FETs over BJTs?
A.
Higher current gain
B.
Lower input impedance
C.
Higher input impedance
D.
Lower power consumption
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Solution
FETs have a higher input impedance compared to BJTs, making them suitable for high-impedance applications.
Correct Answer:
C
— Higher input impedance
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Q. What is the main advantage of using MOSFETs over BJTs?
A.
Higher current gain
B.
Lower power consumption
C.
Better thermal stability
D.
Higher voltage ratings
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Solution
MOSFETs generally have lower power consumption compared to BJTs, making them more efficient in many applications.
Correct Answer:
B
— Lower power consumption
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Q. What is the main characteristic of a BJT in the active region?
A.
It acts as a switch
B.
It can amplify current
C.
It has high input impedance
D.
It is always in saturation
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Solution
In the active region, a BJT can amplify current, making it useful in amplification applications.
Correct Answer:
B
— It can amplify current
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Q. What is the main characteristic of a common-emitter BJT configuration?
A.
High input impedance
B.
Inverted output
C.
Low voltage gain
D.
No phase shift
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Solution
The common-emitter configuration provides an inverted output, meaning the output signal is 180 degrees out of phase with the input.
Correct Answer:
B
— Inverted output
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Q. What is the main characteristic of a Schottky diode?
A.
High reverse breakdown voltage
B.
Low forward voltage drop
C.
High current gain
D.
Temperature stability
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Solution
A Schottky diode is known for its low forward voltage drop, making it efficient for high-speed switching applications.
Correct Answer:
B
— Low forward voltage drop
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Q. What is the main difference between N-channel and P-channel MOSFETs?
A.
The type of charge carriers
B.
The gate voltage requirements
C.
The switching speed
D.
The thermal stability
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Solution
The main difference between N-channel and P-channel MOSFETs is the type of charge carriers; N-channel uses electrons while P-channel uses holes.
Correct Answer:
A
— The type of charge carriers
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Q. What is the main purpose of an operational amplifier (op-amp)?
A.
To rectify AC signals
B.
To amplify voltage signals
C.
To switch electronic circuits
D.
To store charge
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Solution
The main purpose of an operational amplifier (op-amp) is to amplify voltage signals, often used in various analog applications.
Correct Answer:
B
— To amplify voltage signals
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Q. What is the main role of the gate terminal in a MOSFET?
A.
To control the current flow
B.
To provide power supply
C.
To connect to the load
D.
To ground the circuit
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Solution
The gate terminal in a MOSFET controls the current flow between the drain and source terminals.
Correct Answer:
A
— To control the current flow
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Q. What is the output voltage of a voltage follower configuration when the input voltage is 5V?
A.
0V
B.
2.5V
C.
5V
D.
10V
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Solution
In a voltage follower configuration, the output voltage equals the input voltage, so it is 5V.
Correct Answer:
C
— 5V
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Q. What is the output voltage of an operational amplifier if the non-inverting input is at 2V and the inverting input is at 1V?
A.
0V
B.
1V
C.
2V
D.
Saturation voltage
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Solution
If the non-inverting input is higher than the inverting input, the output will go to saturation, typically the supply voltage.
Correct Answer:
D
— Saturation voltage
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Q. What is the primary application of an operational amplifier (op-amp) in circuits?
A.
Signal amplification
B.
Rectification
C.
Voltage regulation
D.
Current limiting
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Solution
Operational amplifiers are primarily used for signal amplification in various electronic circuits.
Correct Answer:
A
— Signal amplification
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Q. What is the primary characteristic of a depletion-mode FET?
A.
It is normally on
B.
It is normally off
C.
It has a negative temperature coefficient
D.
It requires a positive gate voltage to conduct
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Solution
A depletion-mode FET is normally on, meaning it conducts current without any gate voltage applied, and requires a negative gate voltage to turn off.
Correct Answer:
A
— It is normally on
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Q. What is the primary characteristic of a voltage follower configuration using an operational amplifier?
A.
High gain
B.
Low gain
C.
Unity gain
D.
Negative gain
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Solution
The primary characteristic of a voltage follower configuration is that it provides unity gain.
Correct Answer:
C
— Unity gain
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Q. What is the primary characteristic of a Zener diode?
A.
It allows current to flow in one direction only
B.
It can operate in reverse breakdown region
C.
It has a high forward voltage drop
D.
It is used for high-frequency applications
Show solution
Solution
A Zener diode is designed to operate in the reverse breakdown region, providing voltage regulation.
Correct Answer:
B
— It can operate in reverse breakdown region
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Q. What is the primary difference between N-channel and P-channel MOSFETs?
A.
The type of charge carriers
B.
The gate voltage requirements
C.
The physical size
D.
The switching speed
Show solution
Solution
The primary difference is that N-channel MOSFETs use electrons as charge carriers, while P-channel MOSFETs use holes.
Correct Answer:
A
— The type of charge carriers
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Q. What is the primary function of a differential amplifier?
A.
Amplify a single input
B.
Amplify the difference between two inputs
C.
Filter noise
D.
Rectify signals
Show solution
Solution
A differential amplifier amplifies the difference between two input voltages.
Correct Answer:
B
— Amplify the difference between two inputs
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Q. What is the primary function of a diode in communication systems?
A.
Amplification of signals
B.
Rectification of signals
C.
Modulation of signals
D.
Filtering of signals
Show solution
Solution
Diodes are primarily used for rectification, converting AC signals to DC.
Correct Answer:
B
— Rectification of signals
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Q. What is the primary function of a feedback resistor in an operational amplifier circuit?
A.
To increase gain
B.
To stabilize the output
C.
To limit current
D.
To reduce noise
Show solution
Solution
The feedback resistor is used to set the gain of the operational amplifier, thus increasing the overall gain.
Correct Answer:
B
— To stabilize the output
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Q. What is the primary function of a Zener diode?
A.
To rectify AC signals
B.
To allow current to flow in one direction
C.
To regulate voltage
D.
To amplify signals
Show solution
Solution
A Zener diode is specifically designed to regulate voltage by allowing current to flow in the reverse direction when a certain voltage is reached.
Correct Answer:
C
— To regulate voltage
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Q. What is the primary function of an operational amplifier (op-amp)?
A.
To rectify AC signals
B.
To amplify voltage signals
C.
To switch electronic signals
D.
To store charge
Show solution
Solution
The primary function of an operational amplifier is to amplify voltage signals, often used in various analog applications.
Correct Answer:
B
— To amplify voltage signals
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