Electronics

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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. According to Ohm's Law, if the resistance in a circuit is doubled while keeping the voltage constant, what happens to the current?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It becomes zero
Q. For a FET, what is the effect of increasing gate voltage on the drain current?
  • A. Drain current decreases
  • B. Drain current remains constant
  • C. Drain current increases
  • D. Drain current becomes zero
Q. For a parallel circuit with two identical resistors, the total current is:
  • A. Half of the current through one resistor
  • B. Equal to the current through one resistor
  • C. Twice the current through one resistor
  • D. Zero
Q. How does increasing resistance in an RC circuit affect the time response?
  • A. Increases time constant
  • B. Decreases time constant
  • C. No effect
  • D. Increases voltage
Q. How does temperature affect the performance of a diode in a series-parallel circuit?
  • A. Increases forward voltage drop
  • B. Decreases reverse leakage current
  • C. Increases reverse breakdown voltage
  • D. Decreases forward current
Q. How does the current through each component in a parallel circuit relate to the total current?
  • A. It is equal to the total current
  • B. It is less than the total current
  • C. It is greater than the total current
  • D. It is independent of the total current
Q. How does the time response of an RL circuit differ from that of an RC circuit?
  • A. RL is faster than RC
  • B. RC is faster than RL
  • C. Both are the same
  • D. Depends on values of R and L
Q. How does the total resistance change in a series-parallel circuit when more resistors are added in parallel?
  • A. Total resistance increases
  • B. Total resistance decreases
  • C. Total resistance remains the same
  • D. Total resistance becomes infinite
Q. If a diode is forward-biased, what is the expected behavior according to Ohm's Law?
  • A. It behaves like an open circuit
  • B. It behaves like a short circuit
  • C. It has infinite resistance
  • D. It has zero voltage drop
Q. If two resistors are connected in parallel, how do you calculate the total resistance?
  • A. R_total = R1 + R2
  • B. R_total = 1 / (1/R1 + 1/R2)
  • C. R_total = R1 * R2
  • D. R_total = R1 - R2
Q. If two resistors are connected in parallel, the total resistance is:
  • A. Greater than the smallest resistor
  • B. Equal to the smallest resistor
  • C. Less than the smallest resistor
  • D. Equal to the sum of the resistances
Q. In a basic inverting op-amp circuit, if Rf is 10kΩ and Rin is 1kΩ, what is the gain?
  • A. -10
  • B. -1
  • C. 1
  • D. 10
Q. In a basic inverting op-amp configuration, what is the relationship between the input and output voltages?
  • A. Vout = Vin
  • B. Vout = -Vin
  • C. Vout = Vin/2
  • D. Vout = Vin + 1
Q. In a basic summing amplifier configuration, what does the output voltage depend on?
  • A. The sum of the input voltages
  • B. The product of the input voltages
  • C. The difference of the input voltages
  • D. The average of the input voltages
Q. In a bipolar junction transistor (BJT), what are the three regions called?
  • A. Emitter, Base, Collector
  • B. Source, Gate, Drain
  • C. Anode, Cathode, Gate
  • D. Source, Base, Collector
Q. In a BJT, if the base current is increased, what happens to the collector current according to Ohm's Law?
  • A. It decreases
  • B. It remains constant
  • C. It increases
  • D. It becomes zero
Q. In a BJT, what is the region called when it is biased in the active mode?
  • A. Cut-off
  • B. Saturation
  • C. Active
  • D. Reverse
Q. In a BJT, what is the role of the base terminal?
  • A. To collect charge carriers
  • B. To control the current flow
  • C. To provide power
  • D. To dissipate heat
Q. In a BJT, which terminal is the control terminal?
  • A. Emitter
  • B. Collector
  • C. Base
  • D. Gate
Q. In a capacitor, what does the term 'capacitance' refer to?
  • A. The ability to resist current
  • B. The ability to store charge per unit voltage
  • C. The ability to conduct electricity
  • D. The ability to dissipate heat
Q. In a circuit with an inductor, what is the time constant defined as?
  • A. L/R
  • B. R/L
  • C. L*R
  • D. R+L
Q. In a common emitter BJT configuration, what is the phase relationship between the input and output signals?
  • A. In phase
  • B. Out of phase
  • C. No phase relationship
  • D. Dependent on frequency
Q. In a common-emitter BJT configuration, what is the phase relationship between input and output?
  • A. In phase
  • B. Out of phase
  • C. No phase relationship
  • D. Dependent on frequency
Q. In a common-source FET amplifier configuration, what is the phase relationship between the input and output signals?
  • A. In phase
  • B. Out of phase
  • C. No phase relationship
  • D. Dependent on frequency
Q. In a comparator circuit, what happens when the non-inverting input voltage exceeds the inverting input voltage?
  • A. The output goes low
  • B. The output goes high
  • C. The output remains unchanged
  • D. The output oscillates
Q. In a differential amplifier configuration, what does the operational amplifier amplify?
  • A. The average of the input signals
  • B. The difference between the input signals
  • C. The sum of the input signals
  • D. The square of the input signals
Q. In a differential amplifier configuration, what is the output voltage proportional to?
  • A. The difference between two input voltages
  • B. The sum of two input voltages
  • C. The average of two input voltages
  • D. The product of two input voltages
Q. In a differential amplifier, what is the significance of the resistor values?
  • A. They determine the input impedance
  • B. They set the common-mode gain
  • C. They affect the differential gain
  • D. They stabilize the output voltage
Q. In a FET, what does the gate voltage control?
  • A. The drain current
  • B. The source voltage
  • C. The gate current
  • D. The output power
Q. In a first-order RC circuit, what happens to the voltage across the capacitor after 5 time constants?
  • A. It is at 100% of V0
  • B. It is at 63.2% of V0
  • C. It is at 86.5% of V0
  • D. It is at 50% of V0
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