NBC-HIS Exam Prep 2026 Package
Deal | Complete Real Exam
Questions & Correct Verified
Answers (Graded A+)
1. Which component of a hearing aid converts electrical signals into acoustic
energy?
A. Microphone
B. Amplifier
C. Receiver
D. Battery
Answer: _C. Receiver_
The receiver converts the amplified electrical signal into acoustic energy that is
delivered to the ear.
2. What is the primary function of a hearing aid microphone?
A. Amplify electrical signals
B. Convert acoustic energy into an electrical signal
C. Deliver sound to the tympanic membrane
D. Reduce battery drain
Answer: _B. Convert acoustic energy into an electrical signal_
The microphone detects sound waves and converts them into an electrical signal
that can be processed and amplified.
3. Which unit is commonly used to express hearing threshold levels on an
audiogram?
,A. Hertz
B. Decibel hearing level
C. Ohms
D. Watts
Answer: _B. Decibel hearing level_
Audiometric thresholds are typically recorded in decibels hearing level (dB HL),
which represents hearing sensitivity relative to standardized normal-hearing
reference levels.
4. Frequency is measured in which unit?
A. Decibels
B. Hertz
C. Pascals
D. Volts
Answer: _B. Hertz_
Hertz (Hz) represents cycles per second and is used to describe the frequency or
pitch of a sound.
5. What is the main purpose of a hearing-aid vent?
A. Increase battery voltage
B. Provide an acoustic pathway between the ear canal and the outside environment
C. Increase receiver output at all frequencies
D. Eliminate all feedback
Answer: _B. Provide an acoustic pathway between the ear canal and the outside
environment_
A vent can modify the acoustic characteristics of the fitting, including low-
frequency response and the perception of occlusion.
6. A patient reports that their own voice sounds excessively loud and “boomy”
while wearing an earmold. Which fitting issue is most likely involved?
A. Occlusion effect
B. Recruitment
,C. Tinnitus
D. Conductive loss
Answer: _A. Occlusion effect_
The occlusion effect occurs when an ear canal is blocked, causing bone-conducted
low-frequency sounds—particularly the person’s own voice—to sound louder.
7. What is the primary purpose of a hearing-aid feedback management
system?
A. Increase the patient's hearing threshold
B. Reduce unwanted acoustic feedback
C. Increase battery capacity
D. Eliminate background noise completely
Answer: _B. Reduce unwanted acoustic feedback_
Feedback management systems detect or control the conditions that produce
audible whistling or other feedback without unnecessarily reducing useful
amplification.
8. Which condition generally results from dysfunction of the outer or middle
ear?
A. Conductive hearing loss
B. Sensorineural hearing loss
C. Central auditory processing disorder
D. Auditory neuropathy
Answer: _A. Conductive hearing loss_
Conductive hearing loss results from impaired transmission of sound through the
outer or middle ear.
9. Which structure contains the sensory receptors responsible for hearing?
A. Semicircular canals
B. Cochlea
C. Eustachian tube
D. Tympanic membrane
, Answer: _B. Cochlea_
The cochlea contains the organ of Corti and hair cells that transduce mechanical
vibration into neural signals.
10. What is the principal role of the tympanic membrane?
A. Produce endolymph
B. Convert sound directly into neural impulses
C. Vibrate in response to sound and transmit mechanical energy to the middle ear
D. Regulate balance
Answer: _C. Vibrate in response to sound and transmit mechanical energy to the
middle ear_
Sound pressure causes the tympanic membrane to vibrate, transmitting mechanical
energy through the ossicular chain.
11. Which ossicle is attached directly to the tympanic membrane?
A. Stapes
B. Incus
C. Malleus
D. Cochlea
Answer: _C. Malleus_
The malleus is connected to the tympanic membrane and transfers vibration to the
incus and then the stapes.
12. What is the smallest ossicle of the middle ear?
A. Malleus
B. Incus
C. Stapes
D. Pinna
Answer: _C. Stapes_
The stapes is the smallest of the three middle-ear ossicles and transmits vibration
to the oval window.
Deal | Complete Real Exam
Questions & Correct Verified
Answers (Graded A+)
1. Which component of a hearing aid converts electrical signals into acoustic
energy?
A. Microphone
B. Amplifier
C. Receiver
D. Battery
Answer: _C. Receiver_
The receiver converts the amplified electrical signal into acoustic energy that is
delivered to the ear.
2. What is the primary function of a hearing aid microphone?
A. Amplify electrical signals
B. Convert acoustic energy into an electrical signal
C. Deliver sound to the tympanic membrane
D. Reduce battery drain
Answer: _B. Convert acoustic energy into an electrical signal_
The microphone detects sound waves and converts them into an electrical signal
that can be processed and amplified.
3. Which unit is commonly used to express hearing threshold levels on an
audiogram?
,A. Hertz
B. Decibel hearing level
C. Ohms
D. Watts
Answer: _B. Decibel hearing level_
Audiometric thresholds are typically recorded in decibels hearing level (dB HL),
which represents hearing sensitivity relative to standardized normal-hearing
reference levels.
4. Frequency is measured in which unit?
A. Decibels
B. Hertz
C. Pascals
D. Volts
Answer: _B. Hertz_
Hertz (Hz) represents cycles per second and is used to describe the frequency or
pitch of a sound.
5. What is the main purpose of a hearing-aid vent?
A. Increase battery voltage
B. Provide an acoustic pathway between the ear canal and the outside environment
C. Increase receiver output at all frequencies
D. Eliminate all feedback
Answer: _B. Provide an acoustic pathway between the ear canal and the outside
environment_
A vent can modify the acoustic characteristics of the fitting, including low-
frequency response and the perception of occlusion.
6. A patient reports that their own voice sounds excessively loud and “boomy”
while wearing an earmold. Which fitting issue is most likely involved?
A. Occlusion effect
B. Recruitment
,C. Tinnitus
D. Conductive loss
Answer: _A. Occlusion effect_
The occlusion effect occurs when an ear canal is blocked, causing bone-conducted
low-frequency sounds—particularly the person’s own voice—to sound louder.
7. What is the primary purpose of a hearing-aid feedback management
system?
A. Increase the patient's hearing threshold
B. Reduce unwanted acoustic feedback
C. Increase battery capacity
D. Eliminate background noise completely
Answer: _B. Reduce unwanted acoustic feedback_
Feedback management systems detect or control the conditions that produce
audible whistling or other feedback without unnecessarily reducing useful
amplification.
8. Which condition generally results from dysfunction of the outer or middle
ear?
A. Conductive hearing loss
B. Sensorineural hearing loss
C. Central auditory processing disorder
D. Auditory neuropathy
Answer: _A. Conductive hearing loss_
Conductive hearing loss results from impaired transmission of sound through the
outer or middle ear.
9. Which structure contains the sensory receptors responsible for hearing?
A. Semicircular canals
B. Cochlea
C. Eustachian tube
D. Tympanic membrane
, Answer: _B. Cochlea_
The cochlea contains the organ of Corti and hair cells that transduce mechanical
vibration into neural signals.
10. What is the principal role of the tympanic membrane?
A. Produce endolymph
B. Convert sound directly into neural impulses
C. Vibrate in response to sound and transmit mechanical energy to the middle ear
D. Regulate balance
Answer: _C. Vibrate in response to sound and transmit mechanical energy to the
middle ear_
Sound pressure causes the tympanic membrane to vibrate, transmitting mechanical
energy through the ossicular chain.
11. Which ossicle is attached directly to the tympanic membrane?
A. Stapes
B. Incus
C. Malleus
D. Cochlea
Answer: _C. Malleus_
The malleus is connected to the tympanic membrane and transfers vibration to the
incus and then the stapes.
12. What is the smallest ossicle of the middle ear?
A. Malleus
B. Incus
C. Stapes
D. Pinna
Answer: _C. Stapes_
The stapes is the smallest of the three middle-ear ossicles and transmits vibration
to the oval window.
