1. : Which of the following is a characteristic of an analog signal?
(A) Discrete values
(B) Continuous values
(C) Binary values
(D) Quantized values
2. : What is a primary advantage of digital signals over analog signals?
(A) More noise-sensitive
(B) Infinite resolution
(C) Easier to process and store
(D) Requires less bandwidth
3. : In which type of signal is information represented using discrete steps?
(A) Analog
(B) Digital
(C) Both A and B
(D) None of the above
4. : Which of the following is NOT an example of an analog device?
(A) Thermometer
(B) Oscilloscope
(C) Digital clock
(D) Microphone
5. : In digital systems, what are the two states called?
(A) High and Low
(B) On and Off
(C) 1 and 0
(D) All of the above
6. : Which type of signal is more susceptible to noise?
(A) Analog
(B) Digital
(C) Both A and B
(D) Neither A nor B
7. : The process of converting an analog signal to a digital signal is called:
(A) Modulation
(B) Demodulation
(C) Digitization
(D) Quantization
8. : Sampling is a crucial part of which process?
(A) Analog-to-digital conversion
(B) Digital-to-analog conversion
(C) Modulation
(D) Demodulation
9. : Which term describes the number of samples taken per second in a digital signal?
(A) Frequency
(B) Amplitude
(C) Sampling rate
(D) Bandwidth
10. : What is the main disadvantage of digital signals compared to analog signals?
(A) More noise-sensitive
(B) Requires more bandwidth
(C) Infinite resolution
(D) Harder to store and process
11. : Quantization error occurs in which type of signal conversion?
(A) Analog-to-digital conversion
(B) Digital-to-analog conversion
(C) Modulation
(D) Demodulation
12. : Which device is used to convert analog signals to digital signals?
(A) ADC (Analog-to-Digital Converter)
(B) DAC (Digital-to-Analog Converter)
(C) Modem
(D) Multiplexer
13. : In digital communications, what is the process of encoding information into a signal?
(A) Modulation
(B) Demodulation
(C) Sampling
(D) Quantization
14. : Which of the following signals is described by a sine wave?
(A) Digital
(B) Analog
(C) Both A and B
(D) Neither A nor B
15. : What is a bit in the context of digital signals?
(A) The amplitude of the signal
(B) The frequency of the signal
(C) The smallest unit of data
(D) The sampling rate
16. : Which component is essential for converting digital signals to analog signals?
(A) ADC
(B) DAC
(C) Oscilloscope
(D) Amplifier
17. : The Nyquist Theorem is related to which concept in digital signal processing?
(A) Modulation
(B) Demodulation
(C) Sampling rate
(D) Quantization
18. : What happens when the sampling rate is too low in an analog-to-digital conversion?
(A) Increased bandwidth
(B) Aliasing
(C) Increased noise
(D) Higher resolution
19. : A signal that varies over time to represent information is known as:
(A) A constant signal
(B) A variable signal
(C) A time-domain signal
(D) A modulated signal
20. : Which of the following is a common use of digital signals?
(A) Analog radio transmission
(B) Vinyl records
(C) Internet data transfer
(D) Analog telephone lines
