California Teacher Credentialing Examination (CSET) 2026 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 2010

Which set of sounds describes a diphthong?

A combination of two consonant sounds

Two vowel sounds forming a single sound

Diphthongs are defined as a combination of two vowel sounds that blend together to create a single, unique sound within a syllable. This phenomenon occurs when a vowel sound glides into another vowel sound, resulting in a smooth transition that is perceived as one sound. For example, in the English words "coin" or "out," the vowel sounds work together to produce a distinctive auditory experience that is characteristic of diphthongs.

The other options describe different sound constructs that do not fit the definition of a diphthong. Merging two consonant sounds or combining four consonants looks at different phonetic structures entirely, while a single vowel sound does not reflect the complex interaction inherent in diphthongs.

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Four consonants combined

A single vowel sound

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