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. In a half-wave rectifier, what happens to the negative half of the AC signal?
A.
It is amplified
B.
It is blocked
C.
It is inverted
D.
It is passed through
Show solution
Solution
In a half-wave rectifier, the negative half of the AC signal is blocked by the diode.
Correct Answer:
B
— It is blocked
Learn More →
Q. In a JFET, what is the effect of increasing the gate-source voltage (Vgs)?
A.
Increases the drain current
B.
Decreases the drain current
C.
Has no effect on the drain current
D.
Increases the gate current
Show solution
Solution
Increasing the gate-source voltage (Vgs) in a JFET decreases the drain current due to the depletion region widening.
Correct Answer:
B
— Decreases the drain current
Learn More →
Q. In a MOSFET, what does the term 'threshold voltage' refer to?
A.
The maximum voltage the device can handle
B.
The voltage at which the device turns off
C.
The minimum gate voltage required to create a conducting channel
D.
The voltage drop across the drain-source terminals
Show solution
Solution
The threshold voltage is the minimum gate voltage required to create a conducting channel in a MOSFET.
Correct Answer:
C
— The minimum gate voltage required to create a conducting channel
Learn More →
Q. In a non-inverting op-amp configuration, what is the relationship between the input and output voltage?
A.
Vout = Vin
B.
Vout = Vin + Vref
C.
Vout = Vin * (1 + Rf/Rin)
D.
Vout = Vin / (1 + Rf/Rin)
Show solution
Solution
In a non-inverting configuration, the output voltage is given by Vout = Vin * (1 + Rf/Rin).
Correct Answer:
C
— Vout = Vin * (1 + Rf/Rin)
Learn More →
Q. In a non-inverting op-amp configuration, what is the relationship between the input and output voltages?
A.
Vout = Vin
B.
Vout = Vin + Vref
C.
Vout = Vin * (1 + Rf/Rin)
D.
Vout = Vin / (1 + Rf/Rin)
Show solution
Solution
In a non-inverting op-amp configuration, the output voltage is given by Vout = Vin * (1 + Rf/Rin).
Correct Answer:
C
— Vout = Vin * (1 + Rf/Rin)
Learn More →
Q. In a parallel circuit with a diode, if the diode is forward-biased, it will:
A.
Block current
B.
Allow current to flow
C.
Short-circuit the circuit
D.
Increase the total resistance
Show solution
Solution
A forward-biased diode allows current to flow through it, affecting the overall current in the parallel circuit.
Correct Answer:
B
— Allow current to flow
Learn More →
Q. In a parallel circuit with a diode, what is the effect of reverse bias on the diode?
A.
It conducts current
B.
It blocks current
C.
It increases voltage
D.
It decreases resistance
Show solution
Solution
When a diode is reverse biased in a parallel circuit, it blocks current flow, effectively acting as an open circuit.
Correct Answer:
B
— It blocks current
Learn More →
Q. In a parallel circuit with three resistors, if one resistor fails open, what happens to the circuit?
A.
The circuit stops working
B.
The total resistance increases
C.
The total current decreases
D.
The other resistors continue to function
Show solution
Solution
In a parallel circuit, if one resistor fails open, the other resistors continue to function, and the circuit remains operational.
Correct Answer:
D
— The other resistors continue to function
Learn More →
Q. In a parallel circuit, how does the power dissipated by each resistor relate to the total power?
A.
Total power is the sum of individual powers
B.
Total power is the product of individual powers
C.
Total power is the average of individual powers
D.
Total power is the maximum of individual powers
Show solution
Solution
In a parallel circuit, the total power dissipated is the sum of the power dissipated by each resistor.
Correct Answer:
A
— Total power is the sum of individual powers
Learn More →
Q. In a parallel circuit, if one branch fails open, what happens to the other branches?
A.
They stop working
B.
They continue to operate normally
C.
They short-circuit
D.
They increase in voltage
Show solution
Solution
In a parallel circuit, if one branch fails open, the other branches continue to operate normally as they are independent paths.
Correct Answer:
B
— They continue to operate normally
Learn More →
Q. In a parallel circuit, if one resistor fails open, what happens to the other resistors?
A.
They stop working
B.
They continue to operate normally
C.
They short circuit
D.
They increase in resistance
Show solution
Solution
If one resistor in a parallel circuit fails open, the other resistors continue to operate normally as they are still connected to the same voltage source.
Correct Answer:
B
— They continue to operate normally
Learn More →
Q. In a parallel circuit, the power consumed by each component is:
A.
The same
B.
Different
C.
Dependent on the voltage
D.
Dependent on the current
Show solution
Solution
The power consumed by each component in a parallel circuit can be different, depending on the resistance and current through each component.
Correct Answer:
B
— Different
Learn More →
Q. In a parallel circuit, the voltage across each component is:
A.
The same
B.
Different
C.
Dependent on the current
D.
Dependent on the resistance
Show solution
Solution
In a parallel circuit, all components share the same voltage across their terminals.
Correct Answer:
A
— The same
Learn More →
Q. In a parallel circuit, what is the voltage across each component?
A.
The same as the total voltage
B.
Different for each component
C.
Zero volts
D.
The average of all voltages
Show solution
Solution
In a parallel circuit, the voltage across each component is the same as the total voltage applied across the circuit.
Correct Answer:
A
— The same as the total voltage
Learn More →
Q. In a peak detector circuit using an op-amp, what component is crucial for storing the peak voltage?
A.
Resistor
B.
Capacitor
C.
Inductor
D.
Diode
Show solution
Solution
A capacitor is crucial in a peak detector circuit as it stores the peak voltage for later use.
Correct Answer:
B
— Capacitor
Learn More →
Q. In a PLD, what does the term 'logic array' refer to?
A.
A collection of resistors
B.
A matrix of programmable connections
C.
A type of diode configuration
D.
A series of capacitors
Show solution
Solution
The logic array in a PLD is a matrix of programmable connections that can be configured to implement various logic functions.
Correct Answer:
B
— A matrix of programmable connections
Learn More →
Q. In a PLD, what is the role of the logic array?
A.
To store data
B.
To perform arithmetic operations
C.
To implement logic functions
D.
To amplify signals
Show solution
Solution
The logic array in a PLD is responsible for implementing the desired logic functions based on the user's configuration.
Correct Answer:
C
— To implement logic functions
Learn More →
Q. In a precision rectifier circuit, what is the main advantage over a standard diode rectifier?
A.
Higher efficiency
B.
Lower forward voltage drop
C.
Ability to rectify small signals accurately
D.
Faster switching speed
Show solution
Solution
A precision rectifier can accurately rectify small signals that would be lost in a standard diode rectifier due to the diode's forward voltage drop.
Correct Answer:
C
— Ability to rectify small signals accurately
Learn More →
Q. In a rectifier circuit, what happens to the output voltage when the input AC voltage is at its peak?
A.
Output voltage is zero
B.
Output voltage is equal to the peak input voltage
C.
Output voltage is half the peak input voltage
D.
Output voltage is negative
Show solution
Solution
In a rectifier circuit, the output voltage at peak input AC voltage is equal to the peak input voltage, following Ohm's Law.
Correct Answer:
B
— Output voltage is equal to the peak input voltage
Learn More →
Q. In a rectifier circuit, what is the purpose of a filter capacitor?
A.
To increase the output voltage
B.
To smooth out the rectified output
C.
To decrease the current flow
D.
To convert AC to DC
Show solution
Solution
The filter capacitor in a rectifier circuit smooths out the rectified output by reducing voltage ripple.
Correct Answer:
B
— To smooth out the rectified output
Learn More →
Q. In a Schmitt trigger circuit, what is the effect of hysteresis?
A.
It increases the gain
B.
It stabilizes the output against noise
C.
It reduces the input impedance
D.
It allows for faster switching
Show solution
Solution
Hysteresis in a Schmitt trigger stabilizes the output against noise by providing two different threshold voltages for switching.
Correct Answer:
B
— It stabilizes the output against noise
Learn More →
Q. In a series circuit with a BJT, what happens to the collector current when the base current increases?
A.
It decreases
B.
It remains the same
C.
It increases
D.
It becomes zero
Show solution
Solution
In a BJT, the collector current is proportional to the base current, so an increase in base current results in an increase in collector current.
Correct Answer:
C
— It increases
Learn More →
Q. In a series circuit with an operational amplifier, what is the role of feedback?
A.
To increase the input impedance
B.
To stabilize the gain
C.
To decrease the output voltage
D.
To isolate the input from the output
Show solution
Solution
Feedback in an operational amplifier circuit helps to stabilize the gain and improve linearity.
Correct Answer:
B
— To stabilize the gain
Learn More →
Q. In a series circuit with capacitors, how is the total capacitance calculated?
A.
It is the sum of all capacitances
B.
It is the product of all capacitances
C.
It is the reciprocal of the sum of the reciprocals
D.
It is the maximum capacitance
Show solution
Solution
In a series circuit, the total capacitance is calculated as the reciprocal of the sum of the reciprocals of individual capacitances.
Correct Answer:
C
— It is the reciprocal of the sum of the reciprocals
Learn More →
Q. In a series circuit, what happens to the voltage across each component if the total voltage is constant and the resistance of one component increases?
A.
Voltage across all components increases
B.
Voltage across all components decreases
C.
Voltage across the increased resistance increases
D.
Voltage across the increased resistance decreases
Show solution
Solution
If the total voltage is constant and the resistance of one component increases, the voltage across that component will increase.
Correct Answer:
C
— Voltage across the increased resistance increases
Learn More →
Q. In a series circuit, what is the effect of adding more resistors on the total resistance?
A.
Total resistance decreases
B.
Total resistance increases
C.
Total resistance remains the same
D.
Total resistance becomes zero
Show solution
Solution
Adding more resistors in series increases the total resistance of the circuit.
Correct Answer:
B
— Total resistance increases
Learn More →
Q. In a series circuit, what is the effect of increasing the total resistance on the current flow?
A.
Current increases
B.
Current decreases
C.
Current remains the same
D.
Current becomes zero
Show solution
Solution
According to Ohm's law, increasing the total resistance in a series circuit decreases the current flow.
Correct Answer:
B
— Current decreases
Learn More →
Q. In a series circuit, what is the total voltage across multiple diodes?
A.
It is the sum of the individual diode voltages
B.
It is the average of the diode voltages
C.
It is the maximum diode voltage
D.
It is zero
Show solution
Solution
In a series circuit, the total voltage is the sum of the individual diode voltages.
Correct Answer:
A
— It is the sum of the individual diode voltages
Learn More →
Q. In a series RL circuit, what happens to the current when the voltage is suddenly applied?
A.
It instantly reaches maximum value
B.
It increases linearly
C.
It increases exponentially
D.
It remains constant
Show solution
Solution
In a series RL circuit, the current increases exponentially due to the inductor's opposition to changes in current.
Correct Answer:
C
— It increases exponentially
Learn More →
Q. In a series RL circuit, what is the phase relationship between voltage and current?
A.
Voltage leads current by 90 degrees
B.
Current leads voltage by 90 degrees
C.
Voltage and current are in phase
D.
Voltage lags current
Show solution
Solution
In a series RL circuit, the voltage lags the current due to the inductive reactance.
Correct Answer:
D
— Voltage lags current
Learn More →
Showing 31 to 60 of 432 (15 Pages)
