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NBC-HIS EXAM AND STUDY GUIDE NEWEST 2026-
27– NATIONAL BOARD FOR CERTIFICATION IN
HEARING INSTRUMENT SCIENCES | Advanced/Hard
Difficulty | Comprehensive Coverage with Rationales |
Graded A+
1. The auricle (pinna) is composed primarily of which type of tissue?
A. Bone
B. Fibrous cartilage
C. Elastic cartilage
D. Hyaline cartilage
☑ Correct Answer: C
☑ Explanation: The auricle is composed primarily of elastic cartilage, which provides
flexibility and shape retention. Bone (A) is found in the ossicles, fibrous cartilage (B) is found in
intervertebral discs, and hyaline cartilage (D) is found in joints and the trachea.
2. Which of the following structures is responsible for converting mechanical sound waves into
electrochemical signals?
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A. Tympanic membrane
B. Ossicular chain
C. Cochlea
D. Semicircular canals
☑ Correct Answer: C
☑ Explanation: The cochlea contains the organ of Corti, where hair cells convert
mechanical vibrations into electrochemical signals. The tympanic membrane (A) and ossicular
chain (B) transmit sound, and the semicircular canals (D) are responsible for balance.
3. The normal range of human hearing in frequency is:
A. 10 Hz – 15,000 Hz
B. 20 Hz – 20,000 Hz
C. 50 Hz – 25,000 Hz
D. 100 Hz – 30,000 Hz
☑ Correct Answer: B
☑ Explanation: The normal range of human hearing is 20 Hz to 20,000 Hz, though
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sensitivity varies across this range and declines with age. Options A, C, and D fall outside the
generally accepted normal range.
4. A patient presents with a 70 dB HL hearing loss at 4000 Hz but normal thresholds at lower
frequencies. This audiometric pattern is most consistent with:
A. Conductive hearing loss
B. Presbycusis
C. Noise-induced hearing loss
D. Otosclerosis
☑ Correct Answer: C
☑ Explanation: A classic notch at 4000 Hz with normal lower-frequency thresholds is
characteristic of noise-induced hearing loss. Presbycusis (B) typically shows a high-frequency
sloping loss affecting multiple frequencies, not a specific notch.
5. During the course of taking a case history, which of the following information is LEAST
important for a hearing instrument specialist to obtain?
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A. Any unilateral tinnitus experienced
B. Any vertigo symptoms
C. Concussion in the previous six months
D. Patient's preferred color for the hearing aid
☑ Correct Answer: D
☑ Explanation: The patient's preferred color for the hearing aid is cosmetic and not
clinically relevant to the assessment of hearing loss or treatment planning. Unilateral tinnitus
(A), vertigo (B), and recent concussion (C) are all important clinical red flags that may indicate
underlying pathology.
6. The three ossicles of the middle ear, in order from the tympanic membrane to the oval
window, are:
A. Malleus, incus, stapes
B. Incus, malleus, stapes
C. Stapes, incus, malleus
D. Malleus, stapes, incus
NBC-HIS EXAM AND STUDY GUIDE NEWEST 2026-
27– NATIONAL BOARD FOR CERTIFICATION IN
HEARING INSTRUMENT SCIENCES | Advanced/Hard
Difficulty | Comprehensive Coverage with Rationales |
Graded A+
1. The auricle (pinna) is composed primarily of which type of tissue?
A. Bone
B. Fibrous cartilage
C. Elastic cartilage
D. Hyaline cartilage
☑ Correct Answer: C
☑ Explanation: The auricle is composed primarily of elastic cartilage, which provides
flexibility and shape retention. Bone (A) is found in the ossicles, fibrous cartilage (B) is found in
intervertebral discs, and hyaline cartilage (D) is found in joints and the trachea.
2. Which of the following structures is responsible for converting mechanical sound waves into
electrochemical signals?
,2
A. Tympanic membrane
B. Ossicular chain
C. Cochlea
D. Semicircular canals
☑ Correct Answer: C
☑ Explanation: The cochlea contains the organ of Corti, where hair cells convert
mechanical vibrations into electrochemical signals. The tympanic membrane (A) and ossicular
chain (B) transmit sound, and the semicircular canals (D) are responsible for balance.
3. The normal range of human hearing in frequency is:
A. 10 Hz – 15,000 Hz
B. 20 Hz – 20,000 Hz
C. 50 Hz – 25,000 Hz
D. 100 Hz – 30,000 Hz
☑ Correct Answer: B
☑ Explanation: The normal range of human hearing is 20 Hz to 20,000 Hz, though
,3
sensitivity varies across this range and declines with age. Options A, C, and D fall outside the
generally accepted normal range.
4. A patient presents with a 70 dB HL hearing loss at 4000 Hz but normal thresholds at lower
frequencies. This audiometric pattern is most consistent with:
A. Conductive hearing loss
B. Presbycusis
C. Noise-induced hearing loss
D. Otosclerosis
☑ Correct Answer: C
☑ Explanation: A classic notch at 4000 Hz with normal lower-frequency thresholds is
characteristic of noise-induced hearing loss. Presbycusis (B) typically shows a high-frequency
sloping loss affecting multiple frequencies, not a specific notch.
5. During the course of taking a case history, which of the following information is LEAST
important for a hearing instrument specialist to obtain?
, 4
A. Any unilateral tinnitus experienced
B. Any vertigo symptoms
C. Concussion in the previous six months
D. Patient's preferred color for the hearing aid
☑ Correct Answer: D
☑ Explanation: The patient's preferred color for the hearing aid is cosmetic and not
clinically relevant to the assessment of hearing loss or treatment planning. Unilateral tinnitus
(A), vertigo (B), and recent concussion (C) are all important clinical red flags that may indicate
underlying pathology.
6. The three ossicles of the middle ear, in order from the tympanic membrane to the oval
window, are:
A. Malleus, incus, stapes
B. Incus, malleus, stapes
C. Stapes, incus, malleus
D. Malleus, stapes, incus
