- What is noise in the context of electronics?
A. Unwanted signals that interfere with the desired signal
B. Amplified output of a circuit
C. A periodic waveform in a system
D. A signal used for communicationAnswer: A
- Which of the following is NOT a type of electronic noise?
A. Thermal noise
B. Flicker noise
C. Signal distortion
D. Shot noiseAnswer: C
- 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 signalAnswer: B
- The primary source of thermal noise is:
A. Quantum tunneling
B. Brownian motion of electrons in a conductor
C. Electromagnetic radiation
D. Signal amplificationAnswer: B
- 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 noiseAnswer: B
- Flicker noise, also known as 1/f noise, is significant at:
A. High frequencies
B. Low frequencies
C. Mid-range frequencies
D. All frequenciesAnswer: B
- Shot noise is observed in:
A. High-current circuits
B. Semiconductor devices like diodes and transistors
C. AC power lines
D. Electromechanical systemsAnswer: B
- Impulse noise is typically caused by:
A. Random thermal agitation
B. Switching actions or lightning strikes
C. Poorly shielded cables
D. Low-frequency fluctuationsAnswer: B
- Electromagnetic interference (EMI) is caused by:
A. Voltage fluctuations
B. Nearby electronic devices emitting electromagnetic waves
C. Heat dissipation in a circuit
D. Random signal noiseAnswer: B
- Radio Frequency Interference (RFI) affects signals in the:
A. Audio range
B. Low-frequency range
C. Radio frequency range
D. Infrared rangeAnswer: C
- Crosstalk occurs when:
A. Two signals in close proximity interfere with each other
B. A signal is amplified beyond its normal level
C. Thermal noise dominates over shot noise
D. A signal travels without attenuationAnswer: A
- Which of the following is used to reduce electromagnetic interference (EMI)?
A. Shielding
B. Amplification
C. Filtering
D. Both A and CAnswer: D
- 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 aboveAnswer: D
- Twisted pair cables are effective in reducing:
A. Thermal noise
B. Impulse noise
C. Crosstalk
D. Shot noiseAnswer: C
- In power lines, noise and interference can be reduced by:
A. Increasing the conductor size
B. Using proper grounding and shielding
C. Adding more transmission lines
D. Lowering the power supply voltageAnswer: B
- Which component is commonly used to suppress high-frequency noise in circuits?
A. Capacitor
B. Inductor
C. Resistor
D. DiodeAnswer: A
- Noise in communication systems can lead to:
A. Signal attenuation
B. Increased bit error rate (BER)
C. Amplification of the desired signal
D. Elimination of distortionAnswer: B