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 effect of negative feedback in op-amp circuits?
A.
Increases gain
B.
Decreases gain and improves stability
C.
Increases distortion
D.
Eliminates noise completely
Show solution
Solution
Negative feedback decreases gain and improves stability in op-amp circuits, leading to better performance.
Correct Answer:
B
— Decreases gain and improves stability
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Q. What is the effect of temperature on semiconductor behavior in series-parallel circuits?
A.
Increases resistance
B.
Decreases resistance
C.
No effect on resistance
D.
Increases capacitance
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Solution
As temperature increases, the resistance of semiconductors typically decreases due to increased carrier mobility.
Correct Answer:
B
— Decreases resistance
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Q. What is the effect of temperature on the capacitance of a ceramic capacitor?
A.
Capacitance increases with temperature
B.
Capacitance decreases with temperature
C.
Capacitance remains unchanged
D.
Capacitance fluctuates randomly
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Solution
The capacitance of ceramic capacitors typically decreases with increasing temperature.
Correct Answer:
B
— Capacitance decreases with temperature
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Q. What is the efficiency of an ideal transformer?
A.
0%
B.
50%
C.
100%
D.
75%
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Solution
An ideal transformer has an efficiency of 100%, meaning no energy is lost.
Correct Answer:
C
— 100%
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Q. What is the energy band gap in a semiconductor?
A.
The energy required to free an electron
B.
The energy of the conduction band
C.
The energy of the valence band
D.
The energy lost in conduction
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Solution
The energy band gap is the energy required to free an electron from the valence band to the conduction band.
Correct Answer:
A
— The energy required to free an electron
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Q. What is the final voltage across a capacitor in an RC circuit after a long time?
A.
0V
B.
V0
C.
V0/2
D.
V0*e^(-t/RC)
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Solution
After a long time, the voltage across the capacitor in an RC circuit approaches the supply voltage V0.
Correct Answer:
B
— V0
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Q. What is the formula for calculating the total resistance in a series circuit?
A.
R_total = R1 + R2 + R3
B.
R_total = R1 x R2 x R3
C.
R_total = R1 / R2 / R3
D.
R_total = R1 - R2 - R3
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Solution
In a series circuit, the total resistance is the sum of all individual resistances, R_total = R1 + R2 + R3.
Correct Answer:
A
— R_total = R1 + R2 + R3
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Q. What is the formula for the time constant in an RL circuit?
A.
L/R
B.
R/L
C.
L+R
D.
R-L
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Solution
The time constant (τ) in an RL circuit is given by τ = L/R, where L is inductance and R is resistance.
Correct Answer:
A
— L/R
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Q. What is the formula for the time response of a first-order RC circuit to a step input?
A.
V(t) = V_final(1 - e^(-t/τ))
B.
V(t) = V_final(e^(-t/τ))
C.
V(t) = V_initial + (V_final - V_initial)(1 - e^(-t/τ))
D.
V(t) = V_initial + (V_final - V_initial)e^(-t/τ)
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Solution
The time response of a first-order RC circuit to a step input is given by V(t) = V_initial + (V_final - V_initial)(1 - e^(-t/τ)).
Correct Answer:
C
— V(t) = V_initial + (V_final - V_initial)(1 - e^(-t/τ))
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Q. What is the forward voltage drop of a typical silicon diode?
A.
0.2V
B.
0.7V
C.
1.2V
D.
0.5V
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Solution
A typical silicon diode has a forward voltage drop of approximately 0.7V when conducting.
Correct Answer:
B
— 0.7V
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Q. What is the function of a capacitor in a dynamic RAM (DRAM) cell?
A.
To amplify signals
B.
To store charge
C.
To switch states
D.
To rectify signals
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Solution
In a dynamic RAM (DRAM) cell, the capacitor is used to store charge, which represents the binary data.
Correct Answer:
B
— To store charge
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Q. What is the function of a common-emitter configuration in a BJT?
A.
To provide high input impedance
B.
To provide voltage gain
C.
To provide current gain only
D.
To act as a switch
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Solution
The common-emitter configuration provides voltage gain, making it a popular choice for amplification.
Correct Answer:
B
— To provide voltage gain
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Q. What is the function of a coupling capacitor in an amplifier circuit?
A.
To block DC and allow AC signals
B.
To amplify the signal
C.
To provide feedback
D.
To stabilize the power supply
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Solution
Coupling capacitors are used to block DC components while allowing AC signals to pass through, facilitating signal transfer between stages.
Correct Answer:
A
— To block DC and allow AC signals
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Q. What is the function of a peak detector circuit using an op-amp?
A.
To measure average voltage
B.
To store the peak value of an input signal
C.
To filter out AC components
D.
To amplify low-level signals
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Solution
A peak detector circuit stores the peak value of an input signal, allowing for measurement of maximum signal levels.
Correct Answer:
B
— To store the peak value of an input signal
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Q. What is the function of a rectifier in an AC circuit?
A.
To increase voltage
B.
To convert AC to DC
C.
To decrease voltage
D.
To filter signals
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Solution
Rectifiers convert alternating current (AC) into direct current (DC) by allowing current to flow in one direction.
Correct Answer:
B
— To convert AC to DC
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Q. What is the function of a rectifier in power supply circuits?
A.
To increase voltage
B.
To convert AC to DC
C.
To filter noise
D.
To amplify signals
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Solution
The primary function of a rectifier 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 a sample-and-hold circuit in an ADC?
A.
To amplify the input signal
B.
To convert the signal to digital
C.
To maintain a constant voltage level during conversion
D.
To filter out noise
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Solution
A sample-and-hold circuit captures and holds the input voltage constant during the analog-to-digital conversion process.
Correct Answer:
C
— To maintain a constant voltage level during conversion
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Q. What is the function of a Schmitt trigger in op-amp circuits?
A.
To amplify weak signals
B.
To provide hysteresis in signal switching
C.
To filter out high-frequency noise
D.
To integrate input signals
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Solution
A Schmitt trigger provides hysteresis in signal switching, which helps to eliminate noise and provide clean transitions between high and low states.
Correct Answer:
B
— To provide hysteresis in signal switching
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Q. What is the function of a Schmitt trigger?
A.
To amplify weak signals
B.
To provide hysteresis in signal processing
C.
To rectify AC signals
D.
To store binary data
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Solution
A Schmitt trigger is used to provide hysteresis in signal processing, ensuring clean transitions between high and low states.
Correct Answer:
B
— To provide hysteresis in signal processing
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Q. What is the function 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
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Solution
Small-signal models are used to simplify the analysis of linear circuits by approximating the behavior around a bias point.
Correct Answer:
B
— To simplify the analysis of linear circuits
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Q. What is the function of a Zener diode?
A.
To rectify AC signals
B.
To allow current to flow in one direction only
C.
To provide voltage regulation
D.
To amplify signals
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Solution
A Zener diode is used for voltage regulation by allowing current to flow in the reverse direction when a specific voltage is reached.
Correct Answer:
C
— To provide voltage regulation
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Q. What is the function of an operational amplifier (op-amp) in a circuit?
A.
To rectify AC signals
B.
To amplify voltage signals
C.
To switch currents
D.
To store charge
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Solution
An op-amp is primarily used to amplify voltage signals in various applications.
Correct Answer:
B
— To amplify voltage signals
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Q. What is the function of an operational amplifier (op-amp) in a feedback configuration?
A.
To increase the input voltage
B.
To stabilize the output voltage
C.
To amplify the difference between two input voltages
D.
To convert AC signals to DC
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Solution
An op-amp amplifies the difference between its inverting and non-inverting inputs in a feedback configuration.
Correct Answer:
C
— To amplify the difference between two input voltages
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Q. What is the function of an operational amplifier (op-amp) in arithmetic operations?
A.
To perform addition and subtraction
B.
To amplify signals only
C.
To filter signals
D.
To convert digital signals to analog
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Solution
Op-amps can be configured to perform various arithmetic operations, including addition and subtraction.
Correct Answer:
A
— To perform addition and subtraction
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Q. What is the function of an operational amplifier in arithmetic operations?
A.
To perform addition and subtraction
B.
To amplify signals only
C.
To act as a voltage regulator
D.
To convert AC to DC
Show solution
Solution
Operational amplifiers can perform various arithmetic operations, including addition and subtraction.
Correct Answer:
A
— To perform addition and subtraction
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Q. What is the function of the emitter in a BJT?
A.
To inject charge carriers
B.
To collect charge carriers
C.
To control the base current
D.
To provide biasing
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Solution
The emitter in a BJT is responsible for injecting charge carriers into the base region.
Correct Answer:
A
— To inject charge carriers
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Q. What is the hexadecimal equivalent of the binary number 1010?
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Solution
The binary number 1010 is equivalent to A in the hexadecimal number system.
Correct Answer:
A
— A
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Q. What is the input impedance of an ideal op-amp?
A.
Zero
B.
Finite
C.
Infinite
D.
Depends on the configuration
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Solution
An ideal op-amp has infinite input impedance, which means it draws no current from the input source.
Correct Answer:
C
— Infinite
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Q. What is the main advantage of using a Field Effect Transistor (FET) in memory applications?
A.
Higher power consumption
B.
Lower input impedance
C.
Higher input impedance
D.
More complex fabrication
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Solution
FETs have a higher input impedance, which makes them suitable for memory applications as they draw less current from the preceding stage.
Correct Answer:
C
— Higher input impedance
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Q. What is the main advantage of using a PLD over traditional logic circuits?
A.
Lower cost
B.
Higher power consumption
C.
Increased design time
D.
Flexibility in design
Show solution
Solution
PLDs offer flexibility in design, allowing for quick changes and adaptations compared to traditional fixed logic circuits.
Correct Answer:
D
— Flexibility in design
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