NBC-HIS EXAM AND STUDY GUIDE
NEWEST 2026 TEST BANK| COMPLETE
REAL EXAM QUESTIONS AND CORRECT
VERIFIED ,,ANSWER,,,S/ ALREADY
GRADED A+| NBC HIS CERTIFICATION
EXAM PREP 2025/2026 (MOST RECENT!!)
Question 1
The MOST common cause of sudden loss of hearing at 4000 Hz is:
• A. Presbycusis
• B. Noise induced
• C. Acoustic trauma
• D. Acoustic neuroma
Correct ,,answer,,,: C. Acoustic trauma
*Explanation: Acoustic trauma from a sudden intense noise exposure typically
causes a characteristic notch at 4000 Hz. Noise-induced hearing loss typically
develops gradually, while presbycusis shows high-frequency loss bilaterally.
Acoustic neuroma typically causes unilateral, progressive loss.*
Question 2
,A younger mother comes in concerned that her hearing has gone down. In taking
her history, it's found that her mother also developed a hearing loss after the birth
of her first child. What is the MOST probable etiology?
• A. Cholesteatoma
• B. Otitis media
• C. Meniere's disease
• D. Otosclerosis
Correct ,,answer,,,: D. Otosclerosis
*Explanation: Otosclerosis commonly presents in young adults (20-40 years),
affects women more than men, and often worsens during pregnancy. It typically
presents as a conductive hearing loss with a positive family history in about 50%
of cases.*
Question 3
What is the transfer function or areal ratio of the middle ear?
• A. 12:1
• B. 22:1
• C. 32:1
• D. 42:1
Correct ,,answer,,,: B. 22:1
Explanation: The middle ear transformer mechanism provides an impedance
match between air and cochlear fluid. The areal ratio between the tympanic
membrane and the oval window is approximately 22:1, which corresponds to
about a 27 dB increase in sound pressure.
Question 4
,Having determined a patient's UCL at 95 dB using a speech audiometer, what
would the UCL be in SPL?
• A. 95 dB
• B. 105 dB
• C. 115 dB
• D. 125 dB
Correct ,,answer,,,: C. 115 dB
*Explanation: Speech audiometers are calibrated in HL (Hearing Level), which
corresponds to approximately 20 dB SPL at 0 dB HL for speech. Therefore, a UCL
of 95 dB HL equals approximately 115 dB SPL (95 + 20 = 115).*
Question 5
Your patient returns for a first check-up after an initial fitting complaining that "it
sounds like she is talking in a barrel or well." Which problem should the hearing
healthcare professional likely suspect?
• A. Vent diameter is too large
• B. Vent diameter is too small
• C. Gain is set too high
• D. Receiver is damaged
Correct ,,answer,,,: B. Vent diameter is too small
Explanation: A "barrel" or "hollow" sound quality (occlusion effect) occurs when
the ear canal is sealed too tightly, causing the patient's own voice to resonate.
Increasing vent diameter reduces this effect by allowing low-frequency energy to
escape.
Question 6
What is the function of the helicotrema?
, • A. Connects both the scala tympani and the scala vestibuli
• B. Supports the Organ of Corti
• C. Separates the scala vestibuli and the scala media
• D. Generates the electrical charge for the scala media
Correct ,,answer,,,: A. Connects both the scala tympani and the scala vestibuli
Explanation: The helicotrema is the small opening at the apex of the cochlea that
allows fluid communication between the scala tympani and scala vestibuli,
equalizing pressure between the two perilymph-filled chambers.
Question 7
A patient/client has abnormal air conduction thresholds and normal bone
conduction thresholds. What do the test results indicate?
• A. Mixed hearing loss
• B. No hearing loss
• C. Conductive hearing loss
• D. Sensorineural hearing loss
Correct ,,answer,,,: C. Conductive hearing loss
Explanation: When air conduction is abnormal but bone conduction is normal
(air-bone gap present), the hearing loss is conductive in nature. The inner ear and
neural pathways are functioning normally, but sound is not reaching them
efficiently through the outer or middle ear.
Question 8
Which of the following is NOT a verification method?
• A. Real Ear Measurement
• B. Functional gain
• C. COSI
NEWEST 2026 TEST BANK| COMPLETE
REAL EXAM QUESTIONS AND CORRECT
VERIFIED ,,ANSWER,,,S/ ALREADY
GRADED A+| NBC HIS CERTIFICATION
EXAM PREP 2025/2026 (MOST RECENT!!)
Question 1
The MOST common cause of sudden loss of hearing at 4000 Hz is:
• A. Presbycusis
• B. Noise induced
• C. Acoustic trauma
• D. Acoustic neuroma
Correct ,,answer,,,: C. Acoustic trauma
*Explanation: Acoustic trauma from a sudden intense noise exposure typically
causes a characteristic notch at 4000 Hz. Noise-induced hearing loss typically
develops gradually, while presbycusis shows high-frequency loss bilaterally.
Acoustic neuroma typically causes unilateral, progressive loss.*
Question 2
,A younger mother comes in concerned that her hearing has gone down. In taking
her history, it's found that her mother also developed a hearing loss after the birth
of her first child. What is the MOST probable etiology?
• A. Cholesteatoma
• B. Otitis media
• C. Meniere's disease
• D. Otosclerosis
Correct ,,answer,,,: D. Otosclerosis
*Explanation: Otosclerosis commonly presents in young adults (20-40 years),
affects women more than men, and often worsens during pregnancy. It typically
presents as a conductive hearing loss with a positive family history in about 50%
of cases.*
Question 3
What is the transfer function or areal ratio of the middle ear?
• A. 12:1
• B. 22:1
• C. 32:1
• D. 42:1
Correct ,,answer,,,: B. 22:1
Explanation: The middle ear transformer mechanism provides an impedance
match between air and cochlear fluid. The areal ratio between the tympanic
membrane and the oval window is approximately 22:1, which corresponds to
about a 27 dB increase in sound pressure.
Question 4
,Having determined a patient's UCL at 95 dB using a speech audiometer, what
would the UCL be in SPL?
• A. 95 dB
• B. 105 dB
• C. 115 dB
• D. 125 dB
Correct ,,answer,,,: C. 115 dB
*Explanation: Speech audiometers are calibrated in HL (Hearing Level), which
corresponds to approximately 20 dB SPL at 0 dB HL for speech. Therefore, a UCL
of 95 dB HL equals approximately 115 dB SPL (95 + 20 = 115).*
Question 5
Your patient returns for a first check-up after an initial fitting complaining that "it
sounds like she is talking in a barrel or well." Which problem should the hearing
healthcare professional likely suspect?
• A. Vent diameter is too large
• B. Vent diameter is too small
• C. Gain is set too high
• D. Receiver is damaged
Correct ,,answer,,,: B. Vent diameter is too small
Explanation: A "barrel" or "hollow" sound quality (occlusion effect) occurs when
the ear canal is sealed too tightly, causing the patient's own voice to resonate.
Increasing vent diameter reduces this effect by allowing low-frequency energy to
escape.
Question 6
What is the function of the helicotrema?
, • A. Connects both the scala tympani and the scala vestibuli
• B. Supports the Organ of Corti
• C. Separates the scala vestibuli and the scala media
• D. Generates the electrical charge for the scala media
Correct ,,answer,,,: A. Connects both the scala tympani and the scala vestibuli
Explanation: The helicotrema is the small opening at the apex of the cochlea that
allows fluid communication between the scala tympani and scala vestibuli,
equalizing pressure between the two perilymph-filled chambers.
Question 7
A patient/client has abnormal air conduction thresholds and normal bone
conduction thresholds. What do the test results indicate?
• A. Mixed hearing loss
• B. No hearing loss
• C. Conductive hearing loss
• D. Sensorineural hearing loss
Correct ,,answer,,,: C. Conductive hearing loss
Explanation: When air conduction is abnormal but bone conduction is normal
(air-bone gap present), the hearing loss is conductive in nature. The inner ear and
neural pathways are functioning normally, but sound is not reaching them
efficiently through the outer or middle ear.
Question 8
Which of the following is NOT a verification method?
• A. Real Ear Measurement
• B. Functional gain
• C. COSI
