CAOHC - Council for Accreditation in Occupational Hearing Conservation Physics of Sound & Anatomy Questions and Answers

Question 1

An occupational hearing conservationist is measuring noise levels in a manufacturing plant.
To best assess the potential risk for noise-induced hearing loss for employees, which sound level meter weighting scale should be used?

Accepted Answer

A-Weighting

Answer

B-Weighting

Answer

C-Weighting

Answer

Z-Weighting (Flat)

Question 2

A worker is operating a stamping press that generates an average noise level of 95 dBA. According to the inverse square law, if the worker doubles their distance from the press in an open, unobstructed area, what would the new approximate noise level be?

Accepted Answer

89 dBA

Answer

92 dBA

Answer

90 dBA

Answer

85 dBA

Question 3

Which part of the ear is responsible for converting mechanical sound vibrations into electrical signals that are sent to the brain?

Accepted Answer

Organ of Corti

Answer

Tympanic Membrane (Eardrum)

Answer

Ossicles

Answer

Eustachian Tube

Question 4

An employee works an 8-hour shift in an area with a constant noise level of 85 dBA. After work, they report a temporary ringing in their ears and a feeling of muffled hearing. This condition is best described as:

Accepted Answer

Temporary Threshold Shift (TTS)

Answer

Acoustic Trauma

Answer

Permanent Threshold Shift (PTS)

Answer

Conductive Hearing Loss

Question 5

Which of the following is the primary function of the middle ear ossicles (malleus, incus, and stapes)?

Accepted Answer

To amplify sound vibrations from the eardrum and transmit them to the inner ear.

Answer

To equalize pressure between the middle ear and the atmosphere.

Answer

To convert sound waves into electrical impulses.

Answer

To protect the inner ear from foreign bodies.

Question 6

Frequency, the physical characteristic of sound that corresponds to the perception of pitch, is measured in which units?

Accepted Answer

Hertz (Hz)

Answer

Decibels (dB)

Answer

Pascals (Pa)

Answer

Watts per square meter (W/m^2)

An occupational hearing conservationist is measuring noise levels in a manufacturing plant.To best assess the potential risk for noise-induced hearing loss for employees, which sound level meter weighting scale should be used?

An occupational hearing conservationist is measuring noise levels in a manufacturing plant.
To best assess the potential risk for noise-induced hearing loss for employees, which sound level meter weighting scale should be used?