NBC HIS EXAM SCRIPT 2025/2026 QUESTIONS WITH
SOLUTIONS RATED A+
✔✔What is the function of the pinna? - ✔✔To collect and funnel sound into the ear
canal
✔✔What is the oval window? - ✔✔A membrane that connects the middle ear to the
inner ear
✔✔What is real-ear measurement used for? - ✔✔To verify that hearing aid amplification
meets prescriptive targets in the ear canal
✔✔What could cause hearing aid feedback? - ✔✔Poor fit, earwax, or excessive gain
✔✔What is the purpose of a vent in an earmold? - ✔✔To reduce the occlusion effect
and improve sound quality
✔✔What is the term for customizing hearing aids based on prescriptive formulas? -
✔✔Hearing aid programming
✔✔What can cause distorted hearing aid sound? - ✔✔Moisture, low battery, or
malfunctioning components
✔✔What is an earmold impression used for? - ✔✔To create custom-fitted hearing aids
or earmolds
✔✔What is the purpose of a wax guard in a hearing aid? - ✔✔To prevent earwax from
damaging internal components
✔✔What should you do if a hearing aid is weak or dead? - ✔✔Check the battery, clean
the tubing, and inspect for wax or moisture
✔✔What does MPO stand for in hearing aids? - ✔✔Maximum Power Output
✔✔What is a CROS hearing aid used for? - ✔✔To aid individuals with unilateral hearing
loss by routing sound to the better ear
✔✔What does tympanometry assess? - ✔✔Middle ear function and eardrum mobility
✔✔What does a Type B tympanogram suggest? - ✔✔Fluid in the middle ear or a
perforated eardrum
✔✔What is the purpose of acoustic reflex testing? - ✔✔To evaluate the reflexive
contraction of middle ear muscles in response to loud sounds
, ✔✔What is the most common stimulus for pure-tone testing? - ✔✔Warble or pulsed
tones
✔✔What does the bone oscillator test? - ✔✔Cochlear and neural function bypassing the
outer/middle ear
✔✔What is the recommended environment for hearing tests? - ✔✔A sound-treated
booth or quiet room
✔✔What does the term 'threshold' refer to in audiology? - ✔✔The softest sound a
person can hear 50% of the time
✔✔What frequency range is typically tested in audiometry? - ✔✔250 Hz to 8000 Hz
✔✔Why is 1000 Hz often tested first in audiometry? - ✔✔It is easy to hear and serves
as a reference point
✔✔What is crossover hearing? - ✔✔When sound presented to one ear is heard by the
opposite ear
✔✔What must you obtain before conducting a hearing test? - ✔✔Informed consent from
the patient
✔✔What is considered a breach of patient confidentiality? - ✔✔Sharing patient
information without permission
✔✔What is the primary goal of the NBC-HIS Code of Ethics? - ✔✔To protect the
welfare and rights of patients
✔✔Why is continuing education important for hearing instrument specialists? - ✔✔To
stay current with technology and best practices
✔✔What is scope of practice? - ✔✔The legal and professional boundaries within which
a practitioner can work
✔✔What is the best action if you suspect medical pathology? - ✔✔Refer the patient to a
licensed physician or audiologist
✔✔When should you refer a patient to a physician? - ✔✔When signs of infection, pain,
or sudden hearing loss are present
✔✔What should be done if a patient refuses treatment? - ✔✔Document the refusal and
respect their decision
SOLUTIONS RATED A+
✔✔What is the function of the pinna? - ✔✔To collect and funnel sound into the ear
canal
✔✔What is the oval window? - ✔✔A membrane that connects the middle ear to the
inner ear
✔✔What is real-ear measurement used for? - ✔✔To verify that hearing aid amplification
meets prescriptive targets in the ear canal
✔✔What could cause hearing aid feedback? - ✔✔Poor fit, earwax, or excessive gain
✔✔What is the purpose of a vent in an earmold? - ✔✔To reduce the occlusion effect
and improve sound quality
✔✔What is the term for customizing hearing aids based on prescriptive formulas? -
✔✔Hearing aid programming
✔✔What can cause distorted hearing aid sound? - ✔✔Moisture, low battery, or
malfunctioning components
✔✔What is an earmold impression used for? - ✔✔To create custom-fitted hearing aids
or earmolds
✔✔What is the purpose of a wax guard in a hearing aid? - ✔✔To prevent earwax from
damaging internal components
✔✔What should you do if a hearing aid is weak or dead? - ✔✔Check the battery, clean
the tubing, and inspect for wax or moisture
✔✔What does MPO stand for in hearing aids? - ✔✔Maximum Power Output
✔✔What is a CROS hearing aid used for? - ✔✔To aid individuals with unilateral hearing
loss by routing sound to the better ear
✔✔What does tympanometry assess? - ✔✔Middle ear function and eardrum mobility
✔✔What does a Type B tympanogram suggest? - ✔✔Fluid in the middle ear or a
perforated eardrum
✔✔What is the purpose of acoustic reflex testing? - ✔✔To evaluate the reflexive
contraction of middle ear muscles in response to loud sounds
, ✔✔What is the most common stimulus for pure-tone testing? - ✔✔Warble or pulsed
tones
✔✔What does the bone oscillator test? - ✔✔Cochlear and neural function bypassing the
outer/middle ear
✔✔What is the recommended environment for hearing tests? - ✔✔A sound-treated
booth or quiet room
✔✔What does the term 'threshold' refer to in audiology? - ✔✔The softest sound a
person can hear 50% of the time
✔✔What frequency range is typically tested in audiometry? - ✔✔250 Hz to 8000 Hz
✔✔Why is 1000 Hz often tested first in audiometry? - ✔✔It is easy to hear and serves
as a reference point
✔✔What is crossover hearing? - ✔✔When sound presented to one ear is heard by the
opposite ear
✔✔What must you obtain before conducting a hearing test? - ✔✔Informed consent from
the patient
✔✔What is considered a breach of patient confidentiality? - ✔✔Sharing patient
information without permission
✔✔What is the primary goal of the NBC-HIS Code of Ethics? - ✔✔To protect the
welfare and rights of patients
✔✔Why is continuing education important for hearing instrument specialists? - ✔✔To
stay current with technology and best practices
✔✔What is scope of practice? - ✔✔The legal and professional boundaries within which
a practitioner can work
✔✔What is the best action if you suspect medical pathology? - ✔✔Refer the patient to a
licensed physician or audiologist
✔✔When should you refer a patient to a physician? - ✔✔When signs of infection, pain,
or sudden hearing loss are present
✔✔What should be done if a patient refuses treatment? - ✔✔Document the refusal and
respect their decision
