NYSTCE English to Speakers of Other Languages (ESOL) Practice Test

In phonetics, what is a diphthong?

1. A sound combining two consonant sounds

2. A sound made when one vowel blends into another

3. A consonant followed by a vowel

4. A singular vowel sound

The correct answer is: A sound made when one vowel blends into another

A diphthong is defined as a sound made when one vowel blends into another within the same syllable. This phonetic feature involves a smooth transition from one vowel sound to a different one, creating a single, complex vowel sound. For instance, in words like "coin" or "loud," the movement from the first vowel sound to the second happens seamlessly, which is characteristic of a diphthong. Understanding this concept is essential for language learning and teaching, especially for those who are acquiring English as a second language, as it impacts pronunciation and listening comprehension. The other options do not accurately reflect the definition of a diphthong. A combination of two consonant sounds does not relate to vowel sounds, nor does it involve the blend necessary for a diphthong. Similarly, a consonant followed by a vowel describes a syllabic structure, which does not capture the essence of vowel blending. Lastly, a singular vowel sound refers to monophthongs, which are distinct from diphthongs because they do not involve a glide from one vowel to another within the same syllable.