Noise and interference in electronics MCQs January 8, 2026November 20, 2024 by u930973931_answers 17 min Score: 0 Attempted: 0/17 Subscribe 1. What is noise in the context of electronics? (A) A periodic waveform in a system (B) Amplified output of a circuit (C) Unwanted signals that interfere with the desired signal (D) A signal used for communication 2. Which of the following is NOT a type of electronic noise? (A) Thermal noise (B) Signal distortion (C) Flicker noise (D) Shot noise 3. What is interference in electronics? (A) The desired amplification of a signal (B) The interaction between two or more signals causing undesired effects (C) A noise-free transmission process (D) The elimination of harmonics in a signal 4. The primary source of thermal noise is: (A) Quantum tunneling (B) Brownian motion of electrons in a conductor (C) Electromagnetic radiation (D) Signal amplification 5. Which type of noise is caused by random motion of electrons due to temperature? (A) Shot noise (B) Thermal noise (C) Flicker noise (D) Impulse noise 6. Flicker noise, also known as 1/f noise, is significant at: (A) High frequencies (B) Mid-range frequencies (C) Low frequencies (D) All frequencies 7. Shot noise is observed in: (A) Semiconductor devices like diodes and transistors (B) High-current circuits (C) AC power lines (D) Electromechanical systems 8. Impulse noise is typically caused by: (A) Switching actions or lightning strikes (B) Random thermal agitation (C) Poorly shielded cables (D) Low-frequency fluctuations 9. Electromagnetic interference (EMI) is caused by: (A) Nearby electronic devices emitting electromagnetic waves (B) Voltage fluctuations (C) Heat dissipation in a circuit (D) Random signal noise 10. Radio Frequency Interference (RFI) affects signals in the: (A) Audio range (B) Radio frequency range (C) Low-frequency range (D) Infrared range 11. Crosstalk occurs when: (A) A signal is amplified beyond its normal level (B) Two signals in close proximity interfere with each other (C) Thermal noise dominates over shot noise (D) A signal travels without attenuation 12. Which of the following is used to reduce electromagnetic interference (EMI)? (A) Both A and C (B) Amplification (C) Filtering (D) Shielding 13. To reduce noise in a signal, one can use: (A) A high-pass filter (B) A low-pass filter (C) A notch filter (D) All of the above 14. Twisted pair cables are effective in reducing: (A) Thermal noise (B) Impulse noise (C) Shot noise (D) Crosstalk 15. In power lines, noise and interference can be reduced by: (A) Increasing the conductor size (B) Lowering the power supply voltage (C) Adding more transmission lines (D) Using proper grounding and shielding 16. Which component is commonly used to suppress high-frequency noise in circuits? (A) Capacitor (B) Inductor (C) Resistor (D) Diode 17. Noise in communication systems can lead to: (A) Increased bit error rate (BER) (B) Signal attenuation (C) Amplification of the desired signal (D) Elimination of distortion