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 primary advantage of using series-parallel configurations in circuits?
A.
Increased voltage only
B.
Increased current only
C.
Increased power handling
D.
Decreased complexity
Show solution
Solution
Series-parallel configurations allow for increased power handling by combining the benefits of both series and parallel connections.
Correct Answer:
C
— Increased power handling
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Q. What is the primary application of inductors in power supply circuits?
A.
Filtering
B.
Rectification
C.
Amplification
D.
Switching
Show solution
Solution
Inductors are primarily used for filtering in power supply circuits.
Correct Answer:
A
— Filtering
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Q. What is the primary characteristic of a common-emitter BJT configuration?
A.
Voltage gain greater than one
B.
Current gain less than one
C.
Inverted output
D.
No phase shift
Show solution
Solution
The common-emitter BJT configuration provides an inverted output signal.
Correct Answer:
C
— Inverted output
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Q. What is the primary characteristic of a FET in a parallel configuration?
A.
It can only operate in saturation
B.
It allows for high input impedance
C.
It requires a constant voltage
D.
It behaves like a short circuit
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Solution
A FET in a parallel configuration allows for high input impedance, making it suitable for various applications.
Correct Answer:
B
— It allows for high input impedance
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Q. What is the primary characteristic of a log amplifier using an op-amp?
A.
It produces a linear output for linear input
B.
It outputs a logarithmic function of the input voltage
C.
It filters out high-frequency signals
D.
It provides gain for low-level signals
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Solution
A log amplifier outputs a logarithmic function of the input voltage, which is useful in applications requiring exponential scaling.
Correct Answer:
B
— It outputs a logarithmic function of the input voltage
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Q. What is the primary characteristic of a rectifier in a series circuit?
A.
To convert AC to DC
B.
To amplify signals
C.
To increase frequency
D.
To decrease voltage
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Solution
A rectifier's primary function is to convert alternating current (AC) to direct current (DC) in series circuits.
Correct Answer:
A
— To convert AC to DC
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Q. What is the primary characteristic of a rectifier in a series-parallel circuit?
A.
It converts AC to DC
B.
It amplifies AC signals
C.
It filters noise from signals
D.
It stores energy
Show solution
Solution
Rectifiers are designed to convert alternating current (AC) to direct current (DC) in circuits.
Correct Answer:
A
— It converts AC to DC
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Q. What is the primary characteristic of a rectifier?
A.
It converts AC to DC
B.
It amplifies signals
C.
It stores energy
D.
It regulates voltage
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Solution
Rectifiers are designed to convert alternating current (AC) into direct current (DC).
Correct Answer:
A
— It converts AC to DC
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Q. What is the primary characteristic of a Schottky diode?
A.
High reverse breakdown voltage
B.
Low forward voltage drop
C.
High current gain
D.
High thermal stability
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Solution
A Schottky diode is known for its low forward voltage drop, which allows for faster switching speeds and lower power loss.
Correct Answer:
B
— Low forward voltage drop
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Q. What is the primary characteristic of a series rectifier circuit?
A.
It allows AC to pass through
B.
It converts AC to DC
C.
It increases the frequency of the input signal
D.
It decreases the voltage
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Solution
A series rectifier circuit converts alternating current (AC) to direct current (DC) by allowing current to flow in one direction.
Correct Answer:
B
— It converts AC to DC
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Q. What is the primary characteristic of dynamic RAM (DRAM)?
A.
It requires constant refreshing
B.
It is faster than SRAM
C.
It uses a single transistor per bit
D.
It is non-volatile
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Solution
Dynamic RAM (DRAM) requires constant refreshing to maintain the stored data, as it uses capacitors that leak charge over time.
Correct Answer:
A
— It requires constant refreshing
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Q. What is the primary difference between Alternating Current (AC) and Direct Current (DC)?
A.
AC flows in one direction only
B.
DC flows in one direction only
C.
AC is used in batteries
D.
DC is used in power plants
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Solution
Direct Current (DC) flows in one direction only, while Alternating Current (AC) changes direction periodically.
Correct Answer:
B
— DC flows in one direction only
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Q. What is the primary difference between electrolytic and ceramic capacitors?
A.
Size and voltage rating
B.
Polarity and capacitance value
C.
Temperature coefficient and frequency response
D.
Cost and availability
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Solution
Electrolytic capacitors are polarized and typically have higher capacitance values, while ceramic capacitors are non-polarized.
Correct Answer:
B
— Polarity and capacitance value
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Q. What is the primary function of a Bipolar Junction Transistor (BJT)?
A.
Voltage regulation
B.
Current amplification
C.
Signal modulation
D.
Power conversion
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Solution
A BJT is primarily used for current amplification in electronic circuits.
Correct Answer:
B
— Current amplification
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Q. What is the primary function of a bypass capacitor in a BJT amplifier?
A.
To increase the input impedance
B.
To reduce noise
C.
To stabilize the bias point
D.
To improve frequency response
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Solution
A bypass capacitor improves the frequency response of a BJT amplifier by allowing AC signals to bypass the emitter resistor.
Correct Answer:
D
— To improve frequency response
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Q. What is the primary function of a capacitor in a rectifier circuit?
A.
To increase current
B.
To filter out noise
C.
To store charge
D.
To convert AC to DC
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Solution
In a rectifier circuit, a capacitor is used to store charge and smooth out the output voltage.
Correct Answer:
C
— To store charge
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Q. What is the primary function of a capacitor in an electronic circuit?
A.
To store electrical energy
B.
To amplify signals
C.
To rectify AC to DC
D.
To provide feedback
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Solution
Capacitors store electrical energy in an electric field, which can be released when needed.
Correct Answer:
A
— To store electrical energy
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Q. What is the primary function of a diode in a rectifier circuit?
A.
To amplify the signal
B.
To allow current to flow in one direction
C.
To store electrical energy
D.
To convert AC to DC
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Solution
A diode allows current to flow in one direction, which is essential for converting alternating current (AC) to direct current (DC) in rectifier circuits.
Correct Answer:
B
— To allow current to flow in one direction
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Q. What is the primary function of a diode in a semiconductor memory circuit?
A.
To amplify signals
B.
To allow current to flow in one direction
C.
To store charge
D.
To switch signals
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Solution
Diodes are used in semiconductor memory circuits to allow current to flow in one direction, preventing reverse current that could damage the circuit.
Correct Answer:
B
— To allow current to flow in one direction
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Q. What is the primary function of a diode in a series circuit?
A.
To amplify current
B.
To allow current to flow in one direction
C.
To store electrical energy
D.
To increase voltage
Show solution
Solution
A diode allows current to flow in one direction, making it essential for controlling current in series circuits.
Correct Answer:
B
— To allow current to flow in one direction
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Q. What is the primary function of a diode in a series-parallel circuit?
A.
To amplify signals
B.
To allow current to flow in one direction
C.
To store electrical energy
D.
To resist current flow
Show solution
Solution
Diodes are used to allow current to flow in one direction, making them essential in rectifying circuits.
Correct Answer:
B
— To allow current to flow in one direction
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Q. What is the primary function of a diode in an AC circuit?
A.
To amplify the signal
B.
To rectify the current
C.
To filter noise
D.
To provide feedback
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Solution
Diodes are used to rectify alternating current (AC) into direct current (DC) by allowing current to flow in one direction only.
Correct Answer:
B
— To rectify the current
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Q. What is the primary function of a FET?
A.
Current amplification
B.
Voltage amplification
C.
Voltage control
D.
Power control
Show solution
Solution
A FET primarily functions as a voltage-controlled device, where the output current is controlled by the input voltage.
Correct Answer:
C
— Voltage control
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Q. What is the primary function of a Field Effect Transistor (FET)?
A.
To amplify current
B.
To control voltage
C.
To switch electronic signals
D.
To rectify AC to DC
Show solution
Solution
FETs are primarily used to switch electronic signals due to their high input impedance and low power consumption.
Correct Answer:
C
— To switch electronic signals
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Q. What is the primary function of a MOSFET?
A.
To amplify signals
B.
To switch electronic signals
C.
To rectify AC signals
D.
To store energy
Show solution
Solution
MOSFETs are primarily used as electronic switches in various applications due to their high efficiency.
Correct Answer:
B
— To switch electronic signals
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Q. What is the primary function of a Programmable Logic Device (PLD)?
A.
To amplify signals
B.
To perform logic operations
C.
To rectify AC to DC
D.
To store data
Show solution
Solution
PLDs are used to perform logic operations by allowing users to configure the logic functions.
Correct Answer:
B
— To perform logic operations
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Q. What is the primary function of a rectifier in a circuit?
A.
Convert AC to DC
B.
Amplify signals
C.
Filter noise
D.
Store energy
Show solution
Solution
The primary function of a rectifier is to convert alternating current (AC) to direct current (DC).
Correct Answer:
A
— Convert AC to DC
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Q. What is the primary function of a rectifier in semiconductor memory?
A.
To convert AC to DC
B.
To amplify signals
C.
To store charge
D.
To switch signals
Show solution
Solution
Rectifiers are used in semiconductor memory to convert alternating current (AC) to direct current (DC), which is necessary for the operation of digital circuits.
Correct Answer:
A
— To convert AC to DC
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Q. What is the primary function of a rectifier?
A.
To convert DC to AC
B.
To convert AC to DC
C.
To amplify signals
D.
To filter noise
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 primary function of a thyristor?
A.
To amplify signals
B.
To rectify AC to DC
C.
To switch electrical power
D.
To regulate voltage
Show solution
Solution
Thyristors are primarily used as electronic switches to control power in circuits.
Correct Answer:
C
— To switch electrical power
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