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. Which of the following is a characteristic of a BJT?
A.
Voltage-controlled device
B.
Current-controlled device
C.
Power-controlled device
D.
Frequency-controlled device
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Solution
A BJT is a current-controlled device, where the output current is controlled by the input current at the base.
Correct Answer:
B
— Current-controlled device
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Q. Which of the following is a characteristic of a Schottky diode?
A.
High forward voltage drop
B.
Fast switching speed
C.
High reverse breakdown voltage
D.
Low current handling capability
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Solution
Schottky diodes are known for their fast switching speed due to their low forward voltage drop.
Correct Answer:
B
— Fast switching speed
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Q. Which of the following is a characteristic of a transducer?
A.
It can only convert electrical energy to mechanical energy
B.
It can convert one form of energy to another
C.
It is always a passive device
D.
It cannot be used in feedback systems
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Solution
Transducers convert one form of energy to another, such as mechanical to electrical.
Correct Answer:
B
— It can convert one form of energy to another
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Q. Which of the following is a characteristic of an ideal op-amp?
A.
Infinite bandwidth
B.
Finite input impedance
C.
Non-infinite gain
D.
Limited output voltage swing
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Solution
An ideal operational amplifier is characterized by infinite bandwidth, infinite input impedance, and infinite gain, allowing for perfect signal amplification.
Correct Answer:
A
— Infinite bandwidth
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Q. Which of the following is a characteristic of an N-channel MOSFET?
A.
It conducts when a positive voltage is applied to the gate
B.
It conducts when a negative voltage is applied to the gate
C.
It has a higher on-resistance than P-channel MOSFETs
D.
It is always off regardless of gate voltage
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Solution
An N-channel MOSFET conducts when a positive voltage is applied to the gate relative to the source.
Correct Answer:
A
— It conducts when a positive voltage is applied to the gate
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Q. Which of the following is a characteristic of depletion-mode FETs?
A.
They are normally off
B.
They are normally on
C.
They require a positive gate voltage to turn off
D.
They have a negative temperature coefficient
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Solution
Depletion-mode FETs are normally off and require a negative gate voltage to turn on.
Correct Answer:
A
— They are normally off
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Q. Which of the following is a characteristic of Direct Current (DC)?
A.
Voltage can vary over time
B.
Current can reverse direction
C.
Current flows in one direction
D.
Frequency is always constant
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Solution
A characteristic of Direct Current (DC) is that current flows in one direction.
Correct Answer:
C
— Current flows in one direction
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Q. Which of the following is a characteristic of Direct Current?
A.
It can be easily transformed
B.
It flows in both directions
C.
It has a constant polarity
D.
It is used in power generation
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Solution
Direct Current (DC) has a constant polarity, flowing in one direction only.
Correct Answer:
C
— It has a constant polarity
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Q. Which of the following is a characteristic of enhancement-mode MOSFETs?
A.
Conducts with zero gate voltage
B.
Requires a positive gate voltage to conduct
C.
Always conducts regardless of gate voltage
D.
Has a negative threshold voltage
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Solution
Enhancement-mode MOSFETs require a positive gate voltage to create a conductive channel.
Correct Answer:
B
— Requires a positive gate voltage to conduct
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Q. Which of the following is a common application of capacitors in AC circuits?
A.
Filtering
B.
Amplification
C.
Rectification
D.
Switching
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Solution
Capacitors are commonly used for filtering in AC circuits to smooth out voltage fluctuations.
Correct Answer:
A
— Filtering
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Q. Which of the following is a common application of capacitors in circuits?
A.
Signal filtering
B.
Current amplification
C.
Voltage regulation
D.
Power generation
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Solution
Capacitors are commonly used for signal filtering to remove unwanted frequencies.
Correct Answer:
A
— Signal filtering
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Q. Which of the following is a common application of capacitors in power supply circuits?
A.
Voltage regulation
B.
Signal amplification
C.
Energy storage
D.
Phase shifting
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Solution
Capacitors are commonly used in power supply circuits for energy storage to smooth out voltage fluctuations.
Correct Answer:
C
— Energy storage
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Q. Which of the following is a common application of op-amps?
A.
Voltage regulation
B.
Signal modulation
C.
Data storage
D.
Power amplification
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Solution
Op-amps are commonly used in voltage regulation applications.
Correct Answer:
A
— Voltage regulation
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Q. Which of the following is a common application of operational amplifiers?
A.
Rectification
B.
Signal amplification
C.
Voltage regulation
D.
All of the above
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Solution
Operational amplifiers are used in various applications including signal amplification, voltage regulation, and rectification.
Correct Answer:
D
— All of the above
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Q. Which of the following is a key characteristic of inductors?
A.
They have a high resistance to AC signals
B.
They oppose changes in current
C.
They can only be used in DC circuits
D.
They have no effect on frequency
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Solution
Inductors oppose changes in current due to their property of inductance.
Correct Answer:
B
— They oppose changes in current
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Q. Which of the following is a key feature of MOSFETs?
A.
They require a continuous current to operate
B.
They have a gate that is insulated from the channel
C.
They are always in saturation
D.
They have low input impedance
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Solution
MOSFETs have a gate that is insulated from the channel, allowing for very high input impedance and low power consumption.
Correct Answer:
B
— They have a gate that is insulated from the channel
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Q. Which of the following is a key feature of static RAM (SRAM)?
A.
It is slower than DRAM
B.
It is volatile
C.
It requires more transistors per bit
D.
It is less expensive than DRAM
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Solution
Static RAM (SRAM) requires more transistors per bit compared to DRAM, which makes it faster but also more expensive.
Correct Answer:
C
— It requires more transistors per bit
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Q. Which of the following is a small-signal model for a BJT?
A.
Hybrid-pi model
B.
T-model
C.
Both Hybrid-pi and T-model
D.
None of the above
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Solution
Both the Hybrid-pi model and T-model are used as small-signal models for BJTs.
Correct Answer:
C
— Both Hybrid-pi and T-model
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Q. Which of the following is a type of Programmable Logic Device?
A.
BJT
B.
FET
C.
FPGA
D.
Diode
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Solution
FPGA (Field Programmable Gate Array) is a type of PLD that can be programmed to perform various logic functions.
Correct Answer:
C
— FPGA
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Q. Which of the following is a valid binary number?
A.
102
B.
1101
C.
ABC
D.
1.01
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Solution
1101 is a valid binary number as it consists only of the digits 0 and 1.
Correct Answer:
B
— 1101
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Q. Which of the following is NOT a characteristic of PLDs?
A.
Reprogrammable
B.
High integration density
C.
Fixed functionality
D.
Customizable logic
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Solution
Fixed functionality is not a characteristic of PLDs; they are designed to be reprogrammable and customizable.
Correct Answer:
C
— Fixed functionality
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Q. Which of the following is NOT a type of FET?
A.
JFET
B.
MOSFET
C.
BJT
D.
IGBT
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Solution
BJT (Bipolar Junction Transistor) is not a type of FET (Field Effect Transistor).
Correct Answer:
C
— BJT
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Q. Which of the following is NOT a type of transducer?
A.
Thermocouple
B.
Photodiode
C.
Resistor
D.
Piezoelectric sensor
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Solution
A resistor does not convert energy; it simply resists the flow of current.
Correct Answer:
C
— Resistor
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Q. Which of the following materials is a common semiconductor?
A.
Copper
B.
Silicon
C.
Aluminum
D.
Gold
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Solution
Silicon is the most widely used semiconductor material in electronic devices due to its favorable electrical properties.
Correct Answer:
B
— Silicon
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Q. Which of the following PLDs is known for its ability to handle complex logic functions?
A.
PAL
B.
PLA
C.
FPGA
D.
CPLD
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Solution
FPGAs are known for their ability to handle complex logic functions due to their large number of configurable logic blocks.
Correct Answer:
C
— FPGA
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Q. Which property of semiconductors allows them to be used in memory devices?
A.
High thermal conductivity
B.
Variable conductivity
C.
Low melting point
D.
High density
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Solution
The variable conductivity of semiconductors, which can be altered by doping, allows them to be effectively used in memory devices.
Correct Answer:
B
— Variable conductivity
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Q. Which region of a BJT is reverse-biased in the active mode?
A.
Emitter-Base
B.
Collector-Base
C.
Emitter-Collector
D.
Base-Collector
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Solution
In the active mode, the collector-base junction is reverse-biased.
Correct Answer:
B
— Collector-Base
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Q. Which timer IC is commonly used for generating precise time delays?
A.
555 Timer
B.
LM317
C.
LM358
D.
CD4017
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Solution
The 555 Timer IC is widely used for generating precise time delays and oscillations in various applications.
Correct Answer:
A
— 555 Timer
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Q. Which type of capacitor is known for having a high capacitance value in a small package?
A.
Ceramic capacitor
B.
Electrolytic capacitor
C.
Tantalum capacitor
D.
Film capacitor
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Solution
Tantalum capacitors are known for their high capacitance values in small sizes.
Correct Answer:
C
— Tantalum capacitor
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Q. Which type of current is more suitable for electronic circuits?
A.
Alternating Current (AC)
B.
Direct Current (DC)
C.
Both AC and DC
D.
Neither AC nor DC
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Solution
Direct Current (DC) is more suitable for electronic circuits, as most electronic devices require a constant voltage.
Correct Answer:
B
— Direct Current (DC)
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