NEET Physics: Electronics Practice Questions
12 free multiple-choice questions on Electronics for NEET Physics, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more Electronics questions in the app →Q1. The main role of a capacitor in an AC circuit is to store energy by handling the variation in voltage and current across time, rather than purely opposing the DC current flow.
Show answer & explanation
Correct answer: C — To store electrical energy
Capacitors store energy by accumulating charge, which is essential for dealing with fluctuating AC voltages and managing energy storage in oscillating circuits.
Q2. If a Zener diode is operated just below its breakdown voltage, what is the state of the diode?
Show answer & explanation
Correct answer: B — Operating in the reverse saturation region
When operated below the breakdown voltage, the diode acts as an ideal reverse-biased diode, entering the reverse saturation region where it blocks current effectively.
Q3. Which component primarily controls the flow of current by introducing a specific resistance in a circuit?
Show answer & explanation
Correct answer: B — Resistor
The Resistor is the component designed specifically to oppose the flow of electric current and control the current magnitude according to Ohm's Law.
Q4. In an LED circuit, what characteristic distinguishes an LED from a standard diode?
Show answer & explanation
Correct answer: C — LED has a specific forward voltage drop for optimal emission
LEDs are diodes, but they operate by light emission. They have a specific forward voltage required to light up, unlike a general diode which simply allows current flow.
Q5. Which electronic component is specifically designed to allow current flow in only one direction, acting as a switch for current flow, and is represented by the symbol containing an arrowhead?
Show answer & explanation
Correct answer: B — Diode
The component specifically designed to allow current flow in only one direction is the Diode. It acts as a one-way valve for current.
Q6. If a circuit requires a component that regulates the current flow by providing a fixed resistance, which component should be used?
Show answer & explanation
Correct answer: B — Resistor
A resistor is specifically designed to provide a fixed opposition to the flow of current, thereby regulating the current level according to Ohm's law.
Q7. Which component is essential in a circuit primarily to provide a fixed opposition to current flow and is typically identifiable by its color-coded bands?
Show answer & explanation
Correct answer: C — Resistor
Resistors are the primary components used to provide fixed resistance and are standardly identified by color codes.
Q8. A component is used in a circuit to limit the flow of current and dissipate power. Which component is this?
Show answer & explanation
Correct answer: B — Resistor
A resistor limits the flow of current and dissipates the electrical energy as heat, fulfilling its role in current control.
Q9. If a circuit involves a component whose primary role is to limit the current flow independent of the polarity, which component is being used?
Show answer & explanation
Correct answer: C — Resistor
A resistor's fundamental role is to limit the current flow (Ohm's law), regardless of whether the current direction is forward or reverse across a diode.
Q10. If the reverse voltage applied to a Zener diode is exactly equal to its rated breakdown voltage (V_Z), what is the state of the diode?
Show answer & explanation
Correct answer: A — Reverse breakdown state
When the reverse voltage reaches V_Z, the diode enters the Zener breakdown region, where it maintains a specific voltage regardless of small changes in current.
Q11. If the temperature of a Zener diode increases significantly while it is operating in breakdown, what typically happens to its breakdown voltage (V_Z)?
Show answer & explanation
Correct answer: A — It decreases
The breakdown voltage is temperature-sensitive. As temperature increases, the material properties change, and the breakdown voltage generally decreases.
Q12. What is the primary function of a Capacitor in an electrical circuit?
Show answer & explanation
Correct answer: A — To store electrical energy in an electric field
A Capacitor stores electrical energy in the form of an electric field when a voltage is applied across its plates.
Keep going — practice on Padhai Karlo
Padhai Karlo gives you unlimited NEET practice: chapter-wise questions, timed quizzes, and full mock tests with an All-India Rank — free to start.
Get the free Android app →