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What instrument can be heard but not seen?

Common Wrong Answers

A flute

A flute is a physical instrument that can be seen. While it produces sound, it does not fit the criteria of being heard but not seen.

A guitar

Similar to a flute, a guitar is also a visible instrument. It can produce sound, but it does not meet the riddle's condition of being unseen.

A drum

Drums are tangible instruments that can be both heard and seen. They do not fulfill the riddle's requirement of being heard without being visible.