IDRL 308 TEST PAPER 2025/2026 QUESTIONS AND
SOLUTION RATED A+
✔✔Duration - ✔✔the length of time a worker is exposed to noise
✔✔loudness - ✔✔the amount of energy that is being carried through the medium
✔✔Temporary threshold shift (TTS) - ✔✔the normal range of human hearing has been
reduced
✔✔Permanent threshold shift (PTS) - ✔✔permanent loss of hearing due to exposure to
noise
✔✔acoustic trauma - ✔✔Negative health effects caused by short, intense, exposure to
noise, usually of high frequency
✔✔time-weighted average - ✔✔a measure of loudness that factors in frequency of the
noise
✔✔Vibration - ✔✔The oscillating movement of a particle around its stationary reference
position
✔✔whole body vibration - ✔✔Whena workers entire body experiences shaking caused
by contact with the vibration
✔✔segmental vibration - ✔✔only parts of the body are affected by the vibration
✔✔hand arm vibration - ✔✔a form of segmental vibration affecting a worker's hands
and arms, often caused by gripping power tools
✔✔Noise and cibration are what type of hazard - ✔✔- physical
Noise and vibration are related physical hazards with serious health effects. Noise is
better regulated (though imperfectly), while vibration has little regulation in Canada.
Both require more emphasis on elimination and engineering controls instead of relying
on PPE and exposure limits.
✔✔temperature homeostasis - ✔✔maintaining a core body temperature at about
37degrees celsius
✔✔thermal stress - ✔✔Stress produced when temperature extremes prevent our bodies
from properly self-regulating to maintain temperature homeostasis.
, ✔✔thermal comfort - ✔✔The condition in which a person wearing normal clothing feels
neither too cold nor too warm.`
✔✔Radiation - ✔✔Energy emitted from a source, including heat, light, x-rays,
microwaves, and other waves and particles.
✔✔Ionizing radiation - ✔✔Radiation with enough strength to remove electrons from a
molecule as it passes through, such as x-rays, gamma rays, alpha particles, and
neutrons.
✔✔Non-ionizing radiation - ✔✔Radiation without enough strength to remove electrons
from a molecule as it passes through but which may cause other effects, and includes
microwaves, radio waves and ultraviolet, visible, and infrared light.
✔✔temperature and raidiation are considered - ✔✔physical hazards
✔✔Ergonomics - ✔✔the study of how workers and the work environment interact
✔✔Examples of physical hazards - ✔✔-Overhead electrical wires (electrocution risk —
the real-world fatality case).
-Slips, trips, and falls (ubiquitous across all workplaces).
-Struck-by or contact hazards (e.g., low-hanging pipe).
-Noise, vibration, radiation, and temperature (all environmental/physical exposures).
-Ergonomic hazards (awkward postures, poorly designed workstations, tools, or
machinery).
They involve environmental conditions or physical forces that can cause injury
(electricity, gravity, noise, radiation, heat/cold, vibration).
They're not dependent on human intent (as psychosocial hazards would be), but rather
exist inherently in the work environment
✔✔Occupational exposure limits (OEL) - ✔✔The maximum acceptable concentration of
a hazardous substance in workplace air.
✔✔Time-weighted average exposure value (TWAEV): - ✔✔The maximum average
concentration of a chemical in the air for a normal 8-hour working day or 40-hour
working week
SOLUTION RATED A+
✔✔Duration - ✔✔the length of time a worker is exposed to noise
✔✔loudness - ✔✔the amount of energy that is being carried through the medium
✔✔Temporary threshold shift (TTS) - ✔✔the normal range of human hearing has been
reduced
✔✔Permanent threshold shift (PTS) - ✔✔permanent loss of hearing due to exposure to
noise
✔✔acoustic trauma - ✔✔Negative health effects caused by short, intense, exposure to
noise, usually of high frequency
✔✔time-weighted average - ✔✔a measure of loudness that factors in frequency of the
noise
✔✔Vibration - ✔✔The oscillating movement of a particle around its stationary reference
position
✔✔whole body vibration - ✔✔Whena workers entire body experiences shaking caused
by contact with the vibration
✔✔segmental vibration - ✔✔only parts of the body are affected by the vibration
✔✔hand arm vibration - ✔✔a form of segmental vibration affecting a worker's hands
and arms, often caused by gripping power tools
✔✔Noise and cibration are what type of hazard - ✔✔- physical
Noise and vibration are related physical hazards with serious health effects. Noise is
better regulated (though imperfectly), while vibration has little regulation in Canada.
Both require more emphasis on elimination and engineering controls instead of relying
on PPE and exposure limits.
✔✔temperature homeostasis - ✔✔maintaining a core body temperature at about
37degrees celsius
✔✔thermal stress - ✔✔Stress produced when temperature extremes prevent our bodies
from properly self-regulating to maintain temperature homeostasis.
, ✔✔thermal comfort - ✔✔The condition in which a person wearing normal clothing feels
neither too cold nor too warm.`
✔✔Radiation - ✔✔Energy emitted from a source, including heat, light, x-rays,
microwaves, and other waves and particles.
✔✔Ionizing radiation - ✔✔Radiation with enough strength to remove electrons from a
molecule as it passes through, such as x-rays, gamma rays, alpha particles, and
neutrons.
✔✔Non-ionizing radiation - ✔✔Radiation without enough strength to remove electrons
from a molecule as it passes through but which may cause other effects, and includes
microwaves, radio waves and ultraviolet, visible, and infrared light.
✔✔temperature and raidiation are considered - ✔✔physical hazards
✔✔Ergonomics - ✔✔the study of how workers and the work environment interact
✔✔Examples of physical hazards - ✔✔-Overhead electrical wires (electrocution risk —
the real-world fatality case).
-Slips, trips, and falls (ubiquitous across all workplaces).
-Struck-by or contact hazards (e.g., low-hanging pipe).
-Noise, vibration, radiation, and temperature (all environmental/physical exposures).
-Ergonomic hazards (awkward postures, poorly designed workstations, tools, or
machinery).
They involve environmental conditions or physical forces that can cause injury
(electricity, gravity, noise, radiation, heat/cold, vibration).
They're not dependent on human intent (as psychosocial hazards would be), but rather
exist inherently in the work environment
✔✔Occupational exposure limits (OEL) - ✔✔The maximum acceptable concentration of
a hazardous substance in workplace air.
✔✔Time-weighted average exposure value (TWAEV): - ✔✔The maximum average
concentration of a chemical in the air for a normal 8-hour working day or 40-hour
working week
