- Which of the following is an example of an analog signal?
A. A sine wave
B. A binary sequence
C. A digital clock’s output
D. Morse codeAnswer: A
- What is a digital signal?
A. A continuous signal that varies smoothly over time
B. A discrete signal represented by binary values (0s and 1s)
C. A signal that cannot be represented in frequency domain
D. A signal with infinite resolutionAnswer: B
- Which of these devices works primarily with analog signals?
A. Digital thermometer
B. Microphone
C. Computer processor
D. Smartphone screenAnswer: B
- What type of signal is used in modern computers for processing and storage?
A. Analog
B. Digital
C. Continuous
D. PeriodicAnswer: B
- Analog signals are characterized by:
A. Discrete time intervals
B. Continuous amplitude and time
C. Binary representation
D. Fixed resolutionAnswer: B
- What property is unique to digital signals compared to analog signals?
A. Infinite frequency range
B. Continuous representation of data
C. Susceptibility to noise
D. Can be processed using binary arithmeticAnswer: D
- Which of the following is NOT a characteristic of analog signals?
A. Infinite resolution
B. More prone to noise
C. Discrete time intervals
D. Continuous waveformsAnswer: C
- Digital signals are generally preferred in modern technology because they:
A. Consume more power
B. Are less susceptible to noise
C. Are continuous in nature
D. Require infinite bandwidthAnswer: B
- What is the process of converting an analog signal to a digital signal called?
A. Sampling
B. Quantization
C. Digitization
D. All of the aboveAnswer: D
- Which theorem dictates the minimum sampling rate for an analog signal to be accurately converted into a digital signal?
A. Fourier Theorem
B. Nyquist Theorem
C. Shannon’s Law
D. Z-transform TheoremAnswer: B
- What is quantization in the context of analog-to-digital conversion?
A. Measuring signal amplitude continuously
B. Mapping continuous signal values to discrete levels
C. Combining multiple signals into one
D. Modulating an analog signalAnswer: B
- Aliasing occurs when the sampling rate is __________ the Nyquist rate.
A. Greater than
B. Less than
C. Equal to
D. DoubleAnswer: B
- Which of the following is an application of digital signals?
A. FM radio transmission
B. Compact disc (CD) audio storage
C. Analog television broadcasting
D. Voltage output from a thermocoupleAnswer: B
- Which of the following systems primarily uses analog signals?
A. Landline telephones (old models)
B. USB communication
C. Optical fiber data transmission
D. Wi-Fi communicationAnswer: A
- What is the major disadvantage of analog signals compared to digital signals?
A. Limited frequency range
B. High susceptibility to noise
C. Difficulty in continuous transmission
D. Inability to represent real-world phenomenaAnswer: B
- A significant advantage of digital signals is:
A. Infinite resolution
B. Less noise interference
C. Easier representation of natural phenomena
D. Higher bandwidth requirementAnswer: B