Question

which three of the following statements describe an analog signal?
continuous signal
represented by a sine wave
records sound waves as they are
discontinuous values

Explanation:

To determine which statements describe an analog signal, we recall the characteristics of analog signals:

1. Analog signals are continuous (they have a smooth, unbroken range of values), so "continuous signal" is correct.
2. Analog signals can be represented by sine waves (they have a smooth, periodic nature), so "represented by a sine wave" is correct.
3. Analog signals record sound waves as they are (they capture the continuous variation of sound waves), so "records sound waves as they are" is correct.
4. "Discontinuous values" is a characteristic of digital signals, not analog, so it is incorrect.

Answer:

The three statements that describe an analog signal are:

• continuous signal
• represented by a sine wave
• records sound waves as they are