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Analog and Digital Basics

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1. Which of the following best describes an analog signal?
A. A signal that changes continuously
B. A signal that has only two levels
C. A signal that is always encrypted
D. A signal that can only be stored in binary
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2. Which device is most commonly used to convert an analog signal into a digital signal?
A. Modem
B. ADC
C. Printer
D. Speaker
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3. Which of the following is an example of a digital device?
A. Vinyl record player
B. Thermometer with mercury
C. Smartphone
D. Analog clock
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4. Which of the following are advantages of digital signals over analog signals? [Checkboxes]
A. Better resistance to noise
B. Easier storage and processing
C. Always smoother than analog signals
D. Can be copied without significant loss
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5. Which of the following statements about analog and digital systems are correct? [Checkboxes]
A. Analog signals use continuous values
B. Digital signals use discrete values
C. Digital systems cannot represent sound
D. Analog systems cannot be converted to digital
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6. Which of the following are common applications of digital technology? [Checkboxes]
A. Computers
B. Smartphones
C. Cassette tapes
D. Digital cameras
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7. An analog signal can only take two distinct values.
A. True
B. False
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8. Digital signals are less affected by noise than analog signals.
A. True
B. False
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9. Fill in the blank: A device that converts digital data into an analog signal is called a .
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10. Fill in the blank: In a digital system, information is commonly represented using digits.
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11. Briefly explain one major difference between analog and digital signals.
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12. Explain why digital technology is often preferred for modern communication systems.
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