Question

The digital signals are used for transmission in communication system. They are

• A. only of discrete stepwise values.
• B. sound and picture signals in television.
• C. continuous variations of current or voltage.
• D. fundamental sine waves.

Hint:

Digital signals are preferred because they are less affected by noise compared to analog signals.

Answer 1

The Correct Option is A

Step 1: Understanding digital signals.
Digital signals represent information using discrete values, usually binary levels such as 0 and 1.

Step 2: Analysis of options.
(A) Correct, digital signals have discrete stepwise values.
(B) Incorrect, sound and picture signals are analog in nature before digitization.
(C) Incorrect, continuous variations correspond to analog signals.
(D) Incorrect, sine waves are continuous analog waves.

Step 3: Conclusion.
Digital signals are characterized by discrete stepwise values only.