Questions: In music notation, the symbol that indicates the duration of silence is called a - time pause - tone gap - silence - rest

The answer is: rest.

Explanation for each option:

1. Time pause: This term is not commonly used in music notation to indicate silence. It might be confused with a "fermata," which indicates a pause on a note or rest, but it is not the correct term for a symbol indicating silence.

2. Tone gap: This is not a standard term in music notation. It does not refer to any specific symbol or concept related to the duration of silence in music.

3. Silence: While this word describes the absence of sound, it is not the specific term used in music notation to indicate a duration of silence.

4. Rest: This is the correct term. In music notation, a "rest" is a symbol that indicates a specific duration of silence. There are different types of rests (whole rest, half rest, quarter rest, etc.) that correspond to different lengths of silence, similar to how notes correspond to different lengths of sound.