Bennett Mechanical Comprehension Test

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You are standing still on a sidewalk as an ambulance with its siren on approaches you, passes you, and then moves away. How does the pitch of the siren you hear change?

The pitch is high as it approaches and low as it moves away. The pitch is low as it approaches and high as it moves away. The pitch continuously gets lower from the moment you first hear it. The pitch remains constant the entire time.

Correct Answer:

The pitch is high as it approaches and low as it moves away.

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