Fundamentals of Electronics MCQs December 24, 2025November 19, 2024 by u930973931_answers 20 min Score: 0 Attempted: 0/20 Subscribe 1. Which of the following is a passive electronic component? (A) Transistor (B) Diode (C) Resistor (D) Operational Amplifier 2. The SI unit of capacitance is: (A) Henry (H) (B) Farad (F) (C) Ohm (Ω) (D) Volt (V) 3. What is the primary function of a diode? (A) To amplify signals (B) To store energy (C) To allow current to flow in one direction only (D) To convert DC to AC 4. In an NPN transistor, current flows: (A) From emitter to base (B) From base to collector (C) From collector to emitter (D) From emitter to collector 5. Ohm’s Law is given by: (A) V = IR (B) V = I/R (C) V = R/I (D) V = I²R 6. The resistance of a conductor depends on: (A) Voltage and current (B) Capacitance and inductance (C) Length, cross-sectional area, and material of the conductor (D) Temperature only 7. Which of the following is a semiconductor material? (A) Copper (B) Aluminum (C) Silicon (D) Glass 8. What is the function of an inductor in an electronic circuit? (A) To resist the flow of current (B) To store electrical energy in a magnetic field (C) To amplify signals (D) To convert AC to DC 9. The threshold voltage of a silicon diode is approximately: (A) 0.7 V (B) 0.2 V (C) 1.2 V (D) 5 V 10. In an RC circuit, the time constant (τ) is given by: (A) R + C (B) R²C (C) R / C (D) R × C 11. Which of the following devices is used to convert AC to DC? (A) Inductor (B) Diode (C) Transformer (D) Capacitor 12. The unit of electrical power is: (A) Volt (B) Ohm (C) Watt (D) Joule 13. What happens to the current in a series circuit if one component fails? (A) The current remains the same (B) The current increases (C) The current stops (D) The circuit becomes an open circuit 14. A Zener diode is primarily used for: (A) Current amplification (B) Voltage regulation (C) Signal modulation (D) Energy storage 15. Which law states that the sum of currents entering a node is equal to the sum of currents leaving the node? (A) Kirchhoff’s Voltage Law (KVL) (B) Kirchhoff’s Current Law (KCL) (C) Ohm’s Law (D) Faraday’s Law 16. What does a capacitor store in an electronic circuit? (A) Current (B) Energy in the form of an electric field (C) Magnetic field energy (D) Heat 17. Which of the following is a unipolar device? (A) Diode (B) Bipolar Junction Transistor (BJT) (C) Field-Effect Transistor (FET) (D) Transformer 18. Which of the following circuit configurations is used for voltage amplification? (A) Common Emitter (B) Common Base (C) Common Collector (D) Emitter Follower 19. The power dissipation in a resistor is calculated using: (A) P = VI (B) P = I²R (C) All of the above (D) P = V² / R 20. What is the function of a rectifier in an electronic circuit? (A) To amplify the signal (B) To store energy (C) To convert AC to DC (D) To filter noise