What common material hums softly when rubbed, yet holds no voice?
Category: Knowledge · Difficulty: easy
Hint: Look for something that can produce a squeaky noise when touched.
Answer
A balloon's stretched rubber
Explanation
A balloon's rubber can produce a high-pitched hum when rubbed, unlike wood, glass, or metal.
This is an easy knowledge riddle — a good one for children and beginners. The answer is A balloon's stretched rubber.
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