Unit Test — Cumulative exam

Question 64 • EA Academy Online Learning and Digital Citizenship Elective Spring

Wanda and Marita are drinking bottles of water. Each girl sounds a different musical note by blowing across the top of her bottle.What is a good hypothesis that could lead to new experimentation?

Answer

It is more fun to play musical notes with carbonated water than with normal spring water.

If the lid on a bottle is tightly closed, then blowing across the top of the bottle will not make a musical note.

Blowing across the top of a bottle can make a musical note.

If there is less water in the bottle, then the note played is lower because there is more air to move around.

Explanation

A good hypothesis makes a testable prediction about how changing one factor affects the result. Choice D predicts that changing the water level will change the note, so the girls can try bottles with different amounts of water and compare the pitches. Choice C only restates what they already observed, while choice A is subjective.

AI-written and checked against the verified answer.

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