NBC-HIS CERTIFICATION EXAM TEST BANK 200 REALISTIC
PRACTICE QUESTIONS WITH VERIFIED ANSWERS AND
CLINICAL RATIONALES FOR HEARING INSTRUMENT
SPECIALISTS
1. Which structure is responsible for converting mechanical vibrations
into electrical signals in the cochlea?
A. Tectorial membrane
B. Basilar membrane
C. Organ of Corti
D. Round window
Correct Answer: C. Organ of Corti
Rationale: The Organ of Corti contains inner and outer hair cells that
transduce mechanical vibrations from the basilar membrane into neural
electrical signals. The tectorial membrane sits above the hair cells, the
basilar membrane supports them, and the round window releases
pressure.
2. A patient presents with an air-bone gap of 25 dB at 500 Hz, 30 dB at
1000 Hz, and 20 dB at 2000 Hz. Bone conduction thresholds are
normal. This audiometric finding is most consistent with:
A. Sensorineural hearing loss
B. Conductive hearing loss
,C. Mixed hearing loss
D. Retrocochlear pathology
Correct Answer: B. Conductive hearing loss
Rationale: An air-bone gap indicates that air conduction thresholds are
poorer than bone conduction thresholds. Normal bone conduction with
elevated air conduction confirms a conductive component, indicating
pathology in the outer or middle ear.
3. What is the primary purpose of masking in audiometry?
A. To increase patient comfort during testing
B. To prevent the non-test ear from responding to the test signal
C. To improve speech discrimination scores
D. To measure the acoustic reflex threshold
Correct Answer: B. To prevent the non-test ear from responding to the
test signal
Rationale: Masking presents noise to the non-test ear to ensure that
the patient's responses are coming from the test ear, preventing cross-
hearing and ensuring accurate threshold measurements.
4. Which of the following hearing aid styles is most susceptible to the
occlusion effect?
A. BTE (Behind-the-Ear)
B. RIC (Receiver-in-Canal)
C. CIC (Completely-in-Canal)
D. ITE (In-the-Ear)
,Correct Answer: C. CIC (Completely-in-Canal)
Rationale: The occlusion effect occurs when the ear canal is blocked,
amplifying the patient's own voice. CIC and other deep-canal fittings
produce the greatest occlusion effect because they seal the ear canal
more completely.
5. A patient reports that their hearing aid is "whistling" constantly.
What is the most likely cause?
A. Dead battery
B. Moisture in the tubing
C. Acoustic feedback
D. Wax on the battery contacts
Correct Answer: C. Acoustic feedback
Rationale: Acoustic feedback occurs when amplified sound from the
receiver leaks back to the microphone and is re-amplified, creating a
whistle. Common causes include poor earmold fit, cerumen impaction,
or excessive gain.
6. Which cranial nerve carries auditory information from the cochlea
to the brainstem?
A. Cranial Nerve VII (Facial)
B. Cranial Nerve VIII (Vestibulocochlear)
C. Cranial Nerve IX (Glossopharyngeal)
D. Cranial Nerve X (Vagus)
Correct Answer: B. Cranial Nerve VIII (Vestibulocochlear)
, Rationale: The vestibulocochlear nerve (CN VIII) transmits both auditory
information from the cochlea and vestibular information from the
semicircular canals.
7. What does the acronym REM stand for in hearing aid fitting?
A. Rapid Ear Measurement
B. Real-Ear Measurement
C. Reference Ear Method
D. Response Evaluation Model
Correct Answer: B. Real-Ear Measurement
Rationale: Real-Ear Measurement (REM) is the gold standard for
verifying hearing aid performance. It measures the actual sound
pressure level in the ear canal with the hearing aid in place.
8. A patient with presbycusis typically exhibits which audiogram
configuration?
A. Flat loss across all frequencies
B. Rising low-frequency loss
C. Sloping high-frequency loss
D. Notched loss at 4000 Hz
Correct Answer: C. Sloping high-frequency loss
Rationale: Presbycusis, or age-related hearing loss, typically presents as
a bilateral, symmetrical, sloping high-frequency sensorineural hearing
loss affecting higher frequencies more than lower ones.
PRACTICE QUESTIONS WITH VERIFIED ANSWERS AND
CLINICAL RATIONALES FOR HEARING INSTRUMENT
SPECIALISTS
1. Which structure is responsible for converting mechanical vibrations
into electrical signals in the cochlea?
A. Tectorial membrane
B. Basilar membrane
C. Organ of Corti
D. Round window
Correct Answer: C. Organ of Corti
Rationale: The Organ of Corti contains inner and outer hair cells that
transduce mechanical vibrations from the basilar membrane into neural
electrical signals. The tectorial membrane sits above the hair cells, the
basilar membrane supports them, and the round window releases
pressure.
2. A patient presents with an air-bone gap of 25 dB at 500 Hz, 30 dB at
1000 Hz, and 20 dB at 2000 Hz. Bone conduction thresholds are
normal. This audiometric finding is most consistent with:
A. Sensorineural hearing loss
B. Conductive hearing loss
,C. Mixed hearing loss
D. Retrocochlear pathology
Correct Answer: B. Conductive hearing loss
Rationale: An air-bone gap indicates that air conduction thresholds are
poorer than bone conduction thresholds. Normal bone conduction with
elevated air conduction confirms a conductive component, indicating
pathology in the outer or middle ear.
3. What is the primary purpose of masking in audiometry?
A. To increase patient comfort during testing
B. To prevent the non-test ear from responding to the test signal
C. To improve speech discrimination scores
D. To measure the acoustic reflex threshold
Correct Answer: B. To prevent the non-test ear from responding to the
test signal
Rationale: Masking presents noise to the non-test ear to ensure that
the patient's responses are coming from the test ear, preventing cross-
hearing and ensuring accurate threshold measurements.
4. Which of the following hearing aid styles is most susceptible to the
occlusion effect?
A. BTE (Behind-the-Ear)
B. RIC (Receiver-in-Canal)
C. CIC (Completely-in-Canal)
D. ITE (In-the-Ear)
,Correct Answer: C. CIC (Completely-in-Canal)
Rationale: The occlusion effect occurs when the ear canal is blocked,
amplifying the patient's own voice. CIC and other deep-canal fittings
produce the greatest occlusion effect because they seal the ear canal
more completely.
5. A patient reports that their hearing aid is "whistling" constantly.
What is the most likely cause?
A. Dead battery
B. Moisture in the tubing
C. Acoustic feedback
D. Wax on the battery contacts
Correct Answer: C. Acoustic feedback
Rationale: Acoustic feedback occurs when amplified sound from the
receiver leaks back to the microphone and is re-amplified, creating a
whistle. Common causes include poor earmold fit, cerumen impaction,
or excessive gain.
6. Which cranial nerve carries auditory information from the cochlea
to the brainstem?
A. Cranial Nerve VII (Facial)
B. Cranial Nerve VIII (Vestibulocochlear)
C. Cranial Nerve IX (Glossopharyngeal)
D. Cranial Nerve X (Vagus)
Correct Answer: B. Cranial Nerve VIII (Vestibulocochlear)
, Rationale: The vestibulocochlear nerve (CN VIII) transmits both auditory
information from the cochlea and vestibular information from the
semicircular canals.
7. What does the acronym REM stand for in hearing aid fitting?
A. Rapid Ear Measurement
B. Real-Ear Measurement
C. Reference Ear Method
D. Response Evaluation Model
Correct Answer: B. Real-Ear Measurement
Rationale: Real-Ear Measurement (REM) is the gold standard for
verifying hearing aid performance. It measures the actual sound
pressure level in the ear canal with the hearing aid in place.
8. A patient with presbycusis typically exhibits which audiogram
configuration?
A. Flat loss across all frequencies
B. Rising low-frequency loss
C. Sloping high-frequency loss
D. Notched loss at 4000 Hz
Correct Answer: C. Sloping high-frequency loss
Rationale: Presbycusis, or age-related hearing loss, typically presents as
a bilateral, symmetrical, sloping high-frequency sensorineural hearing
loss affecting higher frequencies more than lower ones.
