Page 1 of 99
NBC-HIS EXAM AND STUDY GUIDE NEWEST 2025
TEST BANK| COMPLETE 450 REAL EXAM QUESTIONS
AND CORRECT VERIFIED ANSWERS/ ALREADY
GRADED A+| NBC HIS CERTIFICATION EXAM PREP
2025/2026 (MOST RECENT!!)
Which of the following conditions would NOT be a concern in
establishing a pure tone, air conduction threshold?
A. Collapsed eternal auditory meatus
B. Congenital atresia
C. Otosclerosis
D. Impacted cerumen - Correct Answer - C. Otosclerosis
A large dip at 6000 Hz in one ear only, with a positive tone decay, is
indicative of:
A. Acute otitis media.
B. Industrial deafness.
C. A possible retrocochlear tumor.
D. Acoustic trauma. - Correct Answer - C. A possible retrocochlear
tumor.
When troubleshooting a hearing instrument, the battery current drain
was measured. A reading of 0.00 MA would most likely indicate which
of the following?
pg. 1
,Page 2 of 99
A. Bad microphone.
B. Bad receiver.
C. Plugged acoustic filter.
D. Dead instrument. - Correct Answer - D. Dead instrument.
Which programmable adjustment would BEST help control loud sharp
sounds?
A. Adjust the knee point higher
B. Reduce low frequencies.
C. Increase the compression ratio.
D. Reduce gain. - Correct Answer - C. Increase the compression ratio.
During otoscopic inspection, which ONE of the following is NOT a
consideration for earmold selection?
A. Volume of acoustic cavity.
B. Texture of auricle.
C. Compliance of the tympanum.
D. Depth of concha. - Correct Answer - C. Compliance of the tympanum
A problem that may be caused by shrinking ear, mould tubing is:
A. Harmonic distortion
B. Changing response of the instrument.
C. Increasing gain.
pg. 2
,Page 3 of 99
D. Soreness at top of Pinna - Correct Answer - D. Soreness at top of
pinna
A hearing aid patient comes in complaining that his ITC aids were
working fine until he had them cleaned. Now they are weak and feeding
back and he is told aids will have to be sent in for an out of warranty
repair, or purchase new aids. What is the MOST likely cause of the
problem?
A. Debris in microphone.
B. Microphone pushed in.
C. Receiver tubing pushed in.
D. Wax on receiver. - Correct Answer - C. Receiver tubing pushed in.
What causes conductive hearing loss? - ANSWER - Blockage or damage
in the outer or middle ear
What causes sensorineural hearing loss? - ANSWER - Damage to the
cochlea or auditory nerve
What is mixed hearing loss? - ANSWER - A combination of conductive
and sensorineural hearing loss
What are common causes of sensorineural hearing loss? - ANSWER -
Aging, noise exposure, ototoxic drugs, and genetics
pg. 3
, Page 4 of 99
What hearing loss type typically benefits most from hearing aids? -
ANSWER - Sensorineural hearing loss
What audiogram shape is associated with presbycusis? - ANSWER -
Sloping high-frequency loss
What is the significance of the air-bone gap? - ANSWER - Indicates the
presence of conductive hearing loss
What type of hearing loss might show normal tympanometry results? -
ANSWER - Sensorineural hearing loss
What hearing loss is often temporary and caused by fluid or wax? -
ANSWER - Conductive hearing loss
How is degree of hearing loss classified? - ANSWER - Based on
average thresholds: normal, mild, moderate, severe, profound
What is the purpose of a telecoil in a hearing aid? - ANSWER - To
improve signal quality from phones and loop systems
What does a directional microphone do? - ANSWER - Reduces noise
from behind and enhances sound from in front
pg. 4
NBC-HIS EXAM AND STUDY GUIDE NEWEST 2025
TEST BANK| COMPLETE 450 REAL EXAM QUESTIONS
AND CORRECT VERIFIED ANSWERS/ ALREADY
GRADED A+| NBC HIS CERTIFICATION EXAM PREP
2025/2026 (MOST RECENT!!)
Which of the following conditions would NOT be a concern in
establishing a pure tone, air conduction threshold?
A. Collapsed eternal auditory meatus
B. Congenital atresia
C. Otosclerosis
D. Impacted cerumen - Correct Answer - C. Otosclerosis
A large dip at 6000 Hz in one ear only, with a positive tone decay, is
indicative of:
A. Acute otitis media.
B. Industrial deafness.
C. A possible retrocochlear tumor.
D. Acoustic trauma. - Correct Answer - C. A possible retrocochlear
tumor.
When troubleshooting a hearing instrument, the battery current drain
was measured. A reading of 0.00 MA would most likely indicate which
of the following?
pg. 1
,Page 2 of 99
A. Bad microphone.
B. Bad receiver.
C. Plugged acoustic filter.
D. Dead instrument. - Correct Answer - D. Dead instrument.
Which programmable adjustment would BEST help control loud sharp
sounds?
A. Adjust the knee point higher
B. Reduce low frequencies.
C. Increase the compression ratio.
D. Reduce gain. - Correct Answer - C. Increase the compression ratio.
During otoscopic inspection, which ONE of the following is NOT a
consideration for earmold selection?
A. Volume of acoustic cavity.
B. Texture of auricle.
C. Compliance of the tympanum.
D. Depth of concha. - Correct Answer - C. Compliance of the tympanum
A problem that may be caused by shrinking ear, mould tubing is:
A. Harmonic distortion
B. Changing response of the instrument.
C. Increasing gain.
pg. 2
,Page 3 of 99
D. Soreness at top of Pinna - Correct Answer - D. Soreness at top of
pinna
A hearing aid patient comes in complaining that his ITC aids were
working fine until he had them cleaned. Now they are weak and feeding
back and he is told aids will have to be sent in for an out of warranty
repair, or purchase new aids. What is the MOST likely cause of the
problem?
A. Debris in microphone.
B. Microphone pushed in.
C. Receiver tubing pushed in.
D. Wax on receiver. - Correct Answer - C. Receiver tubing pushed in.
What causes conductive hearing loss? - ANSWER - Blockage or damage
in the outer or middle ear
What causes sensorineural hearing loss? - ANSWER - Damage to the
cochlea or auditory nerve
What is mixed hearing loss? - ANSWER - A combination of conductive
and sensorineural hearing loss
What are common causes of sensorineural hearing loss? - ANSWER -
Aging, noise exposure, ototoxic drugs, and genetics
pg. 3
, Page 4 of 99
What hearing loss type typically benefits most from hearing aids? -
ANSWER - Sensorineural hearing loss
What audiogram shape is associated with presbycusis? - ANSWER -
Sloping high-frequency loss
What is the significance of the air-bone gap? - ANSWER - Indicates the
presence of conductive hearing loss
What type of hearing loss might show normal tympanometry results? -
ANSWER - Sensorineural hearing loss
What hearing loss is often temporary and caused by fluid or wax? -
ANSWER - Conductive hearing loss
How is degree of hearing loss classified? - ANSWER - Based on
average thresholds: normal, mild, moderate, severe, profound
What is the purpose of a telecoil in a hearing aid? - ANSWER - To
improve signal quality from phones and loop systems
What does a directional microphone do? - ANSWER - Reduces noise
from behind and enhances sound from in front
pg. 4
