NBC-HIS EXAM AND STUDY GUIDE NEWEST 2026 TEST
BANK| COMPLETE 450 REAL EXAM QUESTIONS AND
CORRECT VERIFIED ANSWERS/ ALREADY GRADED
A+| NBC HIS CERTIFICATION EXAM PREP 2026/2027
(MOST RECENT!!)
1. The normal range of human hearing in frequency (Hz) is:
A) 5 Hz – 10,000 Hz
B) 20 Hz – 20,000 Hz
C) 100 Hz – 15,000 Hz
D) 500 Hz – 8,000 Hz
Answer: B) 20 Hz – 20,000 Hz
Rationale: The typical human ear can detect frequencies from
20 Hz (low bass) to 20,000 Hz (high treble). This range
decreases with age and noise exposure .
2. What is the primary function of the cochlea?
1
, A) To equalize middle ear pressure
B) To convert sound waves into electrical signals for the
brain
C) To amplify sound vibrations
D) To collect and funnel sound
Answer: B) To convert sound waves into electrical signals for the
brain
Rationale: The cochlea houses the organ of Corti with hair cells
that transduce mechanical vibration into neural impulses sent via
the auditory nerve .
3. Which of the following are the three ossicles of the middle
ear?
A) Malleus, incus, stapes
B) Malleus, incus, cochlea
C) Stapes, round window, oval window
2
, D) Malleus, stapes, tympanic membrane
Answer: A) Malleus, incus, stapes
Rationale: These three small bones (hammer, anvil, stirrup) form
the ossicular chain, transmitting vibration from the tympanic
membrane to the oval window .
4. What is the function of the Eustachian tube?
A) To amplify high-frequency sounds
B) To equalize pressure between the middle ear and
atmosphere
C) To produce cerumen
D) To house the organ of Corti
Answer: B) To equalize pressure between the middle ear and
atmosphere
Rationale: The Eustachian tube opens during
3
, swallowing/yawning to ventilate the middle ear and equalize
pressure, preventing retraction of the tympanic membrane .
5. Which structure separates the outer ear from the middle ear?
A) Oval window
B) Round window
C) Tympanic membrane
D) Tectorial membrane
Answer: C) Tympanic membrane (eardrum)
Rationale: The tympanic membrane vibrates in response to sound
waves and marks the boundary between the external auditory
canal and the middle ear cavity.
6. Where are the hair cells (organ of Corti) located?
A) Semicircular canals
B) Vestibule
4
BANK| COMPLETE 450 REAL EXAM QUESTIONS AND
CORRECT VERIFIED ANSWERS/ ALREADY GRADED
A+| NBC HIS CERTIFICATION EXAM PREP 2026/2027
(MOST RECENT!!)
1. The normal range of human hearing in frequency (Hz) is:
A) 5 Hz – 10,000 Hz
B) 20 Hz – 20,000 Hz
C) 100 Hz – 15,000 Hz
D) 500 Hz – 8,000 Hz
Answer: B) 20 Hz – 20,000 Hz
Rationale: The typical human ear can detect frequencies from
20 Hz (low bass) to 20,000 Hz (high treble). This range
decreases with age and noise exposure .
2. What is the primary function of the cochlea?
1
, A) To equalize middle ear pressure
B) To convert sound waves into electrical signals for the
brain
C) To amplify sound vibrations
D) To collect and funnel sound
Answer: B) To convert sound waves into electrical signals for the
brain
Rationale: The cochlea houses the organ of Corti with hair cells
that transduce mechanical vibration into neural impulses sent via
the auditory nerve .
3. Which of the following are the three ossicles of the middle
ear?
A) Malleus, incus, stapes
B) Malleus, incus, cochlea
C) Stapes, round window, oval window
2
, D) Malleus, stapes, tympanic membrane
Answer: A) Malleus, incus, stapes
Rationale: These three small bones (hammer, anvil, stirrup) form
the ossicular chain, transmitting vibration from the tympanic
membrane to the oval window .
4. What is the function of the Eustachian tube?
A) To amplify high-frequency sounds
B) To equalize pressure between the middle ear and
atmosphere
C) To produce cerumen
D) To house the organ of Corti
Answer: B) To equalize pressure between the middle ear and
atmosphere
Rationale: The Eustachian tube opens during
3
, swallowing/yawning to ventilate the middle ear and equalize
pressure, preventing retraction of the tympanic membrane .
5. Which structure separates the outer ear from the middle ear?
A) Oval window
B) Round window
C) Tympanic membrane
D) Tectorial membrane
Answer: C) Tympanic membrane (eardrum)
Rationale: The tympanic membrane vibrates in response to sound
waves and marks the boundary between the external auditory
canal and the middle ear cavity.
6. Where are the hair cells (organ of Corti) located?
A) Semicircular canals
B) Vestibule
4
