CAOHC Exam Questions with Answers Latest Update | CAOHC EXAM QUESTIONS WITH CORRECT ANSWERS LATEST UPDATED | CAOHC Exam Study Guide – Questions With 100% Correct Answers & CAOHC Final Exam Prep Questions with 100% correct Answers Latest Updated

CAOHC Exam Questions with Answers Latest Update | CAOHC EXAM
QUESTIONS WITH CORRECT ANSWERS LATEST UPDATED | CAOHC
Exam Study Guide – Questions With 100% Correct Answers & CAOHC
Final Exam Prep Questions with 100% correct Answers Latest Updated

Question 1
What is the unit of measurement used to describe the frequency, or pitch, of a sound?
A) Decibel (dB)
B) Time Weighted Average (TWA)
C) Hertz (Hz)
D) Noise Reduction Rating (NRR)
E) Action Level (AL)
Correct Answer: C) Hertz (Hz)
Rationale: Frequency is the rate at which a sound wave vibrates, which the human ear
perceives as pitch. This rate is universally measured in Hertz (Hz), representing the number of
cycles per second.

Question 2
What is the unit of measurement used to describe the intensity, or loudness, of a sound?
A) Hertz (Hz)
B) Decibel (dB)
C) Sound Pressure Level (SPL)
D) Time Weighted Average (TWA)
E) Exchange Rate (ER)
Correct Answer: B) Decibel (dB)
Rationale: The decibel (dB) is a logarithmic unit used to express the ratio of a specific sound
pressure to a reference sound pressure. This scale quantifies the energy or power of a sound
wave, which the human ear perceives as loudness or intensity.

Question 3
The risk of hearing damage from noise exposure is determined by which two primary factors?
A) Pitch and frequency

,B) How loud (intensity) and how long (duration)
C) Ear canal shape and pinna size
D) Sound Pressure Level (SPL) and Hearing Level (HL)
E) Baseline audiogram and current audiogram
Correct Answer: B) How loud (intensity) and how long (duration)
Rationale: Noise-induced hearing damage is a cumulative effect. The two critical determinants
of risk are the sound's intensity (loudness, measured in dB) and the duration (time) of the
exposure. Higher intensity and longer duration both increase the risk to the delicate inner ear
structures.

Question 4
A sound source such as a generator, which lasts 1 second or longer, is classified as what type of
noise?
A) Impulse or Impact noise
B) Conductive noise
C) Sensorineural noise
D) Continuous or steady-state noise
E) Mixed noise
Correct Answer: D) Continuous or steady-state noise
Rationale: Continuous or steady-state noise is characterized by its relatively consistent
intensity level that persists for a second or more. This type of noise, such as that from
operating machinery, is evaluated using a Time Weighted Average (TWA).

Question 5
A sound source, such as gunfire or a nail gun, which lasts less than one second, is classified as
what type of noise?
A) Continuous or steady-state noise
B) Time Weighted Average (TWA)
C) Low-frequency noise
D) Impulse or Impact noise
E) Action Level (AL) noise

,Correct Answer: D) Impulse or Impact noise
Rationale: Impulse or Impact noise is defined by its extremely short duration, less than a
second, and its abrupt, very high intensity peak. Special measurement and protection
considerations often apply to this specific type of high-risk noise.

Question 6
Which two structures make up the outer ear?
A) Tympanic membrane and ossicles
B) Cochlea and auditory nerve
C) Pinna and external auditory canal
D) Eustachian tube and middle ear space
E) Malleus and stapes
Correct Answer: C) Pinna and external auditory canal
Rationale: The outer ear, or external ear, consists of the pinna (auricle), which collects sound
waves, and the external auditory canal (ear canal), which directs those sound waves toward
the tympanic membrane (eardrum).

Question 7
Which three primary structures comprise the middle ear?
A) Cochlea, auditory nerve, and inner hair cells
B) Pinna, external auditory canal, and cerumen
C) Tympanic membrane, ossicles, and eustachian tube
D) Oval window, round window, and basilar membrane
E) Semicircular canals, vestibule, and cochlea
Correct Answer: C) Tympanic membrane, ossicles, and eustachian tube
Rationale: The middle ear is an air-filled space containing the tympanic membrane (eardrum),
the three tiny bones (ossicles), and the eustachian tube. These structures work together to
amplify sound and equalize pressure.

Question 8
What is the function of the Eustachian tube (auditory tube)?

, A) To collect sound waves and amplify them.
B) To convert mechanical sound waves to neural impulses.
C) To equalize the middle ear space with atmospheric pressure.
D) To protect the inner ear from hazardous noise.
E) To transfer sound from the eardrum to the oval window.
Correct Answer: C) To equalize the middle ear space with atmospheric pressure.
Rationale: The Eustachian tube connects the middle ear to the pharynx (back of the throat).
Its crucial function is to open and close to match the pressure inside the middle ear with the
ambient atmospheric pressure, ensuring the tympanic membrane can vibrate freely and
preventing hearing issues.

Question 9
In which parts of the ear does conductive hearing loss (HL) primarily occur?
A) Cochlea or auditory nerve
B) Outer or middle ear
C) Inner ear only
D) Eustachian tube and pharynx
E) Semicircular canals and vestibule
Correct Answer: B) Outer or middle ear
Rationale: Conductive hearing loss results from a mechanical problem that prevents sound
waves from efficiently reaching the inner ear. This interference is always localized to the outer
ear (e.g., earwax blockage) or the middle ear (e.g., ossicular chain damage, fluid behind the
eardrum).

Question 10
Hearing loss resulting from damage to the inner ear (cochlea) or the auditory nerve is classified
as what type of hearing loss?
A) Conductive hearing loss
B) Mixed hearing loss
C) Central hearing loss
D) Functional hearing loss