Which of the following accurately defines an analogue signal?

An analogue signal is accurately defined as a continuous signal, which is option C. Unlike digital signals, which are discrete and represent specific values (often in binary form), analogue signals vary continuously over time. This means they can take on any value within a given range, reflecting changes smoothly rather than in steps.

For instance, audio signals captured by microphones are typically analogue in nature; they vary in amplitude and frequency continuously to represent sound waves. This characteristic makes analogue signals well-suited for representing real-world phenomena, such as sound, light, and temperature, where variations occur in a continuous manner rather than in distinct increments.

The other choices do not accurately describe analogue signals. Discrete signals, which define option A, are associated with digital signals. An analogue signal does not represent a binary state, which pertains to option B, as it can represent a wide range of values rather than just two states (0 or 1). Lastly, option D inaccurately states that analogue signals can only be read by computers; in fact, analogue signals are often interpreted by various devices, such as sensors and microphones, before being converted into digital signals for computer processing.