Which term describes transmitting information by a continuous varying signal?

• A. Analog
• B. Digital
• C. Discrete
• D. Oscillating

Answer: (A)

Transmitting information by a signal that can take any value smoothly over time is described as analog. In analog transmission, the waveform varies continuously in amplitude, frequency, or phase, so the data are represented by a seamless range of values—like the changing shape of a sound wave from a microphone or radio broadcast. Digital transmission, by contrast, uses only distinct values, typically 0s and 1s, so the signal changes in steps rather than a smooth continuum. A discrete signal relies on separate levels rather than a continuous range. Oscillating just means the signal moves back and forth in a regular pattern and doesn’t by itself specify whether the information is carried in continuous variation or in discrete steps. Therefore, analog is the best term for describing transmission by a continuous varying signal.