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Hazmat Awareness - Operations
Chapter 11
Knowledge Check
1.
At WMD or criminal incidents, in order for any recordings to be later admissible as evidence, responders must follow appropriate protocols with regard to:
time.
weather.
chain of custody.
technology application.
2.
While no current meter or device can detect reactive materials, potentially hazardous chemical reactions will cause:
phase changes.
a temperature change.
an increase in radiation.
increased oxygen levels.
3.
In a colorimetric indicator tube, a preconditioning filter may precede the indicating chemical in order to:
remove any traces of oxygen in the tube.
increase the speed at which results are displayed.
remove contaminants that may interfere with the measurement.
allow the instrument to measure specific chemicals and groups of gases.
4.
Two key factors that dictate the detection and monitoring strategies and tactics used at an incident as well as the PPE required to perform these strategies and tactics are the hazards present at the incident and the:
season.
weather conditions.
responders' mission.
responders' skill level.
5.
A pH of 7 is:
basic.
toxic.
acidic.
neutral.
6.
Exposure limit is the:
concentration of an ingested or injected substance that results in the death of 50 percent of the test population.
English System unit used to express the radiation absorbed dose (rad) equivalence as pertaining to a human body.
maximum length of time an individual can be exposed to an airborne substance before injury, illness, or death occurs.
elapsed time between the movement of an air sample into a monitoring detection device and the reading provided to the user.
7.
Why might it be helpful to contact current users of equipment before you buy it?
They can teach you how to use the equipment.
They can get you a good deal on the equipment.
Current users can offer insight into the product's durability and ease of use.
Current users know more about the product's specs than the manufacturer.
8.
Stripped or bleached pH paper likely indicates:
neutral materials.
especially corrosive acids.
especially corrosive bases.
oxidizers and organic peroxides.
9.
To verify monitoring and sampling results, when possible, use:
new, uncalibrated technology.
observations from people at the scene.
a single sampling method and technology.
more than one sampling method and technology.
10.
A typical 4-gas monitor will detect:
LEL, oxygen, carbon dioxide, and hydrogen sulfide.
LEL, oxygen, carbon dioxide, and potassium sulfate.
LEL, carbon dioxide, ammonia, and hydrogen sulfide
LEL, oxygen, carbon monoxide, and hydrogen sulfide.
11.
Why should responders monitor oxygen levels when using combustible gas indicators (CGis)?
Too little oxygen exaggerates readings.
Low levels of oxygen may damage sensors.
CGis may need specific oxygen levels to function.
High levels of oxygen are necessary to support combustion.
12.
In order to properly determine concentrations of different gases, monitoring and detection equipment should be operated:
for a few seconds at a time.
at different heights in a room/area.
on the same grade within a building.
by several technicians at the same time.
13.
When responders use a CGI calibrated to one gas to measure other flammable gases:
the CGI will not show any results due to incorrect use of the instrument.
the CGI adjusts itself to give more correct results based on a system of conversions.
the actual LEL of the gas being measured may differ from the reading the CGI displays.
the actual LEL of the gas being measured will not differ from the reading the CGI displays.
14.
Roentgen® is a unit used to measure:
exposure to gamma and x-ray radiation.
the percentage of oxygen in the atmosphere.
the amount of radiation absorbed by a material.
the absorbed dose equivalence as pertaining to a human body.
15.
Lethal concentration is the concentration of an _____ substance that results in the death of the entire test population.
inhaled
injected
ingested
absorbed
16.
Where is it particularly important for responders to test for the presence of radiation and contamination?
Every incident
Oil spill incidents
Potential terrorist attacks
Randomly selected incidents
17.
Rather than providing concentrations of specific materials, some meters will instead provide the percentage of a:
material in water.
material's dosage.
material's toxicity.
material in the atmosphere.
18.
Why should responders frequently replace oxygen sensors?
They are easily breakable.
Newer models are more effective.
They continually degrade, even when not in use.
They are the most commonly used detection instruments.
19.
Immediately dangerous to life or health (IDLH) describes:
concentrations at which most people are not adversely affected.
concentrations high enough to kill or cause serious injury or illness.
concentrations that should not be exceeded during 8-hour workdays.
concentration of an ingested or injected substance that results in the death of 50 percent of the test population.
20.
Although they provide more precise readings than pH paper, pH meters may be less practical for field use because:
they can only be used once.
they are much bigger than pH paper.
they must be calibrated before each use.
they are much more expensive than pH paper.
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