Cognitive Reflection Test (CRT) Practice

Question: 1 / 400

What has keys but can't open locks?

A keyboard

A piano

The answer is a piano because it has keys—specifically, the white and black keys that produce musical notes when pressed. Unlike traditional keys, which are designed to open and close locks, the keys of a piano serve a different function, focusing on sound production rather than physical unlocking.

A keyboard also has keys, but it is primarily used for typing and does not fit the riddle's intent as closely as a piano. A map contains symbols and often has a legend to help interpret those symbols, but it does not have keys in the traditional sense. A code refers to a system of symbols or rules used for encryption or communication, again lacking the physical keys associated with locks. Thus, the piano is the most fitting answer, embodying the playful nature of the riddle's wording by having keys that contribute to music rather than unlocking mechanisms.

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A map

A code

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