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, 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?
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, • 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

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, • 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



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