Question

Digital signal

• A. is represented by a sine wave
• B. utilizes binary code system
• C. is represented by a cosine wave
• D. utilizes a hexadecimal code

Hint:

Digital vs Analog Signals

• Analog: continuous (e.g., sine wave).
• Digital: discrete levels, usually binary (0 and 1).
• Binary code is used in all digital circuits.
• Hexadecimal is a compact human-readable form of binary.

Answer 1

The Correct Option is B

A digital signal represents information using discrete steps—most commonly 0 and 1 in binary form. Unlike analog signals (which are continuous and often sine/cosine waves), digital signals use high/low voltage levels corresponding to binary states. Binary code forms the backbone of digital communication, computing, and logic systems. While hexadecimal may be used to represent binary efficiently, it's not the signal’s intrinsic form. So, a digital signal fundamentally utilizes the binary code system. Hence, option (2) is correct.

Answer 2

Step 1: Understand what a digital signal is
A digital signal represents information using discrete values or steps. It usually switches between two distinct voltage levels that correspond to binary digits, 0 and 1.

Step 2: Compare with analog signals
Analog signals are continuous and vary smoothly over time, often in the form of sine or cosine waves. In contrast, digital signals jump between discrete values without intermediate states.

Step 3: Identify the code system used by digital signals
Digital signals use the binary code system, which is based on two states (0 and 1). This binary system is the fundamental language for digital communication and computing.

Step 4: Clarify about hexadecimal representation
Hexadecimal numbers are sometimes used to represent binary data more compactly, but the actual digital signal itself is inherently binary, not hexadecimal.

Step 5: Conclusion
Therefore, digital signals fundamentally use the binary code system to represent information, making option (2) the correct choice.