Ch 5: Physical Agents

At what core body temperature does mild hypothermia start to set in?

37.2oC to 36.1oC

What is the required noise attenuation in a commercial laundry where actual noise level is 95 dB(A) and the standard is 88 dB(a) for eight hours?

14 dB(A)

Which of the following decibel (dB) differences represents a doubling of "loudness"?

80 dB to 83 dB

As their popularity increases, the move from playing in small clubs to playing in large stadiums can produce tinnitus for band members if they are not careful.

True

What factor would explain why, in a cold climate, Worker A can raise their body temperature by four degrees by jogging on the spot or skipping with a rope, whereas Worker B can only raise their body temperature by two degrees?

Worker B is female.

Which of the following forms of ionizing radiation does not occur naturally?

X-rays

When assessing the impact of vibration on employee health which of the following is NOT evaluated?

the source of the vibration energy

What index is used to measure thermal stress?

wet bulb globe temperature index

Engineers working in the engine room of a cruise ship are more likely to experience segmental vibration than chefs working in the cruise ship kitchen.

False

Hyperpyrexia is the condition of unusually quick reaction by the nerves to some external stimulus.

False

Akanksha is a dental hygienist who cleans patients' teeth for 35 hours a week. What is the most realistic way of minimizing segmental vibration from the electric polishing brush?

adding padding to the handle of the brush

What two basic types of physiological damage can create hearing loss?

conductive and sensorineural

Temporary threshold shifts (TTS) is the term used to describe gradual hearing loss.

True

The eye is the primary organ at risk from non-ionizing radiation.

True

The heat level in a crowded room or subway car rises due to convection.

True

While at work, Zamboni drivers who resurface the ice in hockey arenas are more likely to have lower blood pressure than athletic trainers working in arena dressing rooms.

True

Imagine a large-scale kitchen operation such as the Mandarin, Boston Pizza, or Swiss Chalet. Even though restaurant customers might experience a relatively quiet, comfortable, and relaxing atmosphere out front, in the kitchen area there are many physical agents that can impair the safety and health of kitchen workers and servers. If a kitchen worker gets locked into the walk-in freezer either by accident or by a misguided prank, when you finally find them what symptom would tell you that they are suffering from moderate hypothermia?

abnormal drowsiness

What three characteristics is the human hearing response conditional on?

frequency, duration, and loudness

HAVS is an acronym for which of the following syndromes?

hand-arm vibration syndrome

Which of the following devices emits ionizing radiation?

hospital scanner

Long-distance truck drivers could be subject to what whole-body vibration-related problem as a result of sitting over or near the engine for long periods of time?

impaired vision

Rick is the supervisor of a road crew working on highway resurfacing. What administrative control would help his workers acclimatize to working in the heat?

mandatory water break policy

In what three ways can noise affect humans?

physiological damage, physiological effects, and psychological effects

Imagine a large-scale kitchen operation such as the Mandarin, Boston Pizza, or Swiss Chalet. Even though restaurant customers might experience a relatively quiet, comfortable, and relaxing atmosphere out front, in the kitchen area there are many physical agents that can impair the safety and health of kitchen workers and servers. From which source could a chef or sous chef (preparation cook) be exposed to ionizing radiation?

vegetables

According to the Canadian Centre for Occupational Health and Safety, when might a workplace be too noisy?

when employees have to raise their voices to be understood

Imagine a large-scale kitchen operation such as the Mandarin, Boston Pizza, or Swiss Chalet. Even though restaurant customers might experience a relatively quiet, comfortable, and relaxing atmosphere out front, in the kitchen area there are many physical agents that can impair the safety and health of kitchen workers and servers. During the dinner hour when there are a lot of boiling pots, frying pans, and hot ovens in constant operation, what is likely to be the typical humidex range captured using the WGBT index?

40-45 degrees C

Imagine a large-scale kitchen operation such as the Mandarin, Boston Pizza, or Swiss Chalet. Even though restaurant customers might experience a relatively quiet, comfortable, and relaxing atmosphere out front, in the kitchen area there are many physical agents that can impair the safety and health of kitchen workers and servers. There are four mechanical dishwashers in the kitchen running at the following sound ratings: 82 dB, 84 dB, 86 dB, and 88 dB. A 2 dB difference translates to a noise factor increase of 2.1 dB, a 4 dB difference to a factor of 1.5, and a 6 dB difference to a factor of 1.0. Given this information, what is the total noise level coming from the dishwashers?

89.0 dB

Imagine a large-scale kitchen operation such as the Mandarin, Boston Pizza, or Swiss Chalet. Even though restaurant customers might experience a relatively quiet, comfortable, and relaxing atmosphere out front, in the kitchen area there are many physical agents that can impair the safety and health of kitchen workers and servers. The kitchen has a number of large floor-standing mixers for mixing large batches of cake and bread dough. The frequency of these mixers is 75 Hz. What part of the body would be affected by resonance at this frequency?

Eyeballs

If a roofer is suffering from hyperpyrexia after installing replacement shingles for eight hours in the hot sun their skin will be dry and tight.

False

To measure the gross noise level in the casino, the casino's health and safety manager, Kamran, will use an octave band analyzer.

False

What condition is an employee likely experiencing if he or she reports tingling in the fingers, loss of sensation in the fingers, and loss of grip strength?

HAVS

What statistical value should Aiko look at to compare the hearing protection of various devices on the market?

NRR

Dog trainers can experience hearing loss from using a "silent" dog whistle.

True

School boards can generate the "free field effect" for teachers by taking what action?

having longer recess and lunch periods

What heat-related condition could you resolve by giving workers salty crackers along with some water?

heat cramps