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# NBC-HIS CERTIFICATION EXAM 2025/2026##
NATIONAL BOARD FOR CERTIFICATION IN
HEARING INSTRUMENT SCIENCES**200+ PRACTICE
QUESTIONS | VERIFIED ANSWERS & DETAILED
RATIONALES**GRADED A+ | FIRST-TIME PASS
GUARANTEE**
TABLE OF CONTENTS
| Section | Domain | Questions |
| I | Anatomy & Physiology of the Auditory System | 1-25 |
| II | Acoustics & Psychoacoustics | 26-40 |
| III | Hearing Assessment & Diagnostic Testing | 41-60 |
| IV | Hearing Instrument Technology & Signal Processing | 61-80 |
| V | Hearing Instrument Fitting, Verification & Validation | 81-100 |
| VI | Patient Care & Counseling | 101-115 |
| VII | Infection Control & Safety | 116-125 |
| VIII | Professional & Business Practices | 126-140 |
| IX | Medical Considerations & Referral Criteria | 141-155 |
| X | Special Populations (Pediatric, Geriatric, Tinnitus) | 156-170 |
| XI | Advanced Technology & Telehealth | 171-180 |
| XII | Comprehensive Case Scenarios | 181-205 |
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# SECTION I: ANATOMY & PHYSIOLOGY OF THE AUDITORY
SYSTEM (Questions 1-25)
**1. The auricle (pinna) is composed primarily of which type of
tissue?**
A) Bone
B) Elastic cartilage
C) Fibrocartilage
D) Hyaline cartilage
**Correct Answer: B**
**Rationale:** The auricle (pinna) is made of elastic cartilage covered
by thin skin. Elastic cartilage provides flexibility and maintains shape.
Fibrocartilage is found in intervertebral discs. Hyaline cartilage is found
at the ends of long bones and in the nasal septum.
---
**2. Which structure separates the external ear from the middle ear?**
A) Round window
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B) Oval window
C) Tympanic membrane (eardrum)
D) Eustachian tube
**Correct Answer: C**
**Rationale:** The tympanic membrane (eardrum) is a thin, conical
membrane that separates the external auditory canal from the middle ear
cavity. It vibrates in response to sound waves, transmitting acoustic
energy to the ossicular chain.
---
**3. The three ossicles of the middle ear, in order from lateral to medial,
are:**
A) Stapes, incus, malleus
B) Malleus, incus, stapes
C) Incus, malleus, stapes
D) Malleus, stapes, incus
**Correct Answer: B**
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**Rationale:** The ossicular chain from lateral to medial (tympanic
membrane to oval window): Malleus (hammer) attaches to the tympanic
membrane, incus (anvil) connects malleus to stapes, and stapes (stirrup)
footplate inserts into the oval window.
---
**4. The Eustachian tube connects the middle ear to which structure?**
A) Oropharynx
B) Nasopharynx
C) External auditory canal
D) Mastoid air cells
**Correct Answer: B**
**Rationale:** The Eustachian tube (auditory tube) connects the middle
ear to the nasopharynx (back of the nose/throat). It equalizes pressure
between the middle ear and atmosphere. Dysfunction leads to negative
middle ear pressure and conductive hearing loss.
---
# NBC-HIS CERTIFICATION EXAM 2025/2026##
NATIONAL BOARD FOR CERTIFICATION IN
HEARING INSTRUMENT SCIENCES**200+ PRACTICE
QUESTIONS | VERIFIED ANSWERS & DETAILED
RATIONALES**GRADED A+ | FIRST-TIME PASS
GUARANTEE**
TABLE OF CONTENTS
| Section | Domain | Questions |
| I | Anatomy & Physiology of the Auditory System | 1-25 |
| II | Acoustics & Psychoacoustics | 26-40 |
| III | Hearing Assessment & Diagnostic Testing | 41-60 |
| IV | Hearing Instrument Technology & Signal Processing | 61-80 |
| V | Hearing Instrument Fitting, Verification & Validation | 81-100 |
| VI | Patient Care & Counseling | 101-115 |
| VII | Infection Control & Safety | 116-125 |
| VIII | Professional & Business Practices | 126-140 |
| IX | Medical Considerations & Referral Criteria | 141-155 |
| X | Special Populations (Pediatric, Geriatric, Tinnitus) | 156-170 |
| XI | Advanced Technology & Telehealth | 171-180 |
| XII | Comprehensive Case Scenarios | 181-205 |
,2|Page
# SECTION I: ANATOMY & PHYSIOLOGY OF THE AUDITORY
SYSTEM (Questions 1-25)
**1. The auricle (pinna) is composed primarily of which type of
tissue?**
A) Bone
B) Elastic cartilage
C) Fibrocartilage
D) Hyaline cartilage
**Correct Answer: B**
**Rationale:** The auricle (pinna) is made of elastic cartilage covered
by thin skin. Elastic cartilage provides flexibility and maintains shape.
Fibrocartilage is found in intervertebral discs. Hyaline cartilage is found
at the ends of long bones and in the nasal septum.
---
**2. Which structure separates the external ear from the middle ear?**
A) Round window
,3|Page
B) Oval window
C) Tympanic membrane (eardrum)
D) Eustachian tube
**Correct Answer: C**
**Rationale:** The tympanic membrane (eardrum) is a thin, conical
membrane that separates the external auditory canal from the middle ear
cavity. It vibrates in response to sound waves, transmitting acoustic
energy to the ossicular chain.
---
**3. The three ossicles of the middle ear, in order from lateral to medial,
are:**
A) Stapes, incus, malleus
B) Malleus, incus, stapes
C) Incus, malleus, stapes
D) Malleus, stapes, incus
**Correct Answer: B**
, 4|Page
**Rationale:** The ossicular chain from lateral to medial (tympanic
membrane to oval window): Malleus (hammer) attaches to the tympanic
membrane, incus (anvil) connects malleus to stapes, and stapes (stirrup)
footplate inserts into the oval window.
---
**4. The Eustachian tube connects the middle ear to which structure?**
A) Oropharynx
B) Nasopharynx
C) External auditory canal
D) Mastoid air cells
**Correct Answer: B**
**Rationale:** The Eustachian tube (auditory tube) connects the middle
ear to the nasopharynx (back of the nose/throat). It equalizes pressure
between the middle ear and atmosphere. Dysfunction leads to negative
middle ear pressure and conductive hearing loss.
---
