Final answer:
Hypernasality in its purist form would be exhibited on an articulation test with nasal substitutions for specific phonemes.
Step-by-step explanation:
Hypernasality in its purist and most overt form would be exhibited on an articulation test with these nasal substitutions for the nasal phonemes m/b, n/d, g/ing. Hypernasality refers to excessive nasal resonance during speech, which can occur due to structural or functional abnormalities in the nasal cavity. In this case, the nasal phonemes are being substituted with non-nasal sounds, resulting in hypernasal speech.