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Hazmat Specialist Practice Questions - Hazardous Materials Specialist (NFPA 470) Certification Exam Exam
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Question
1
of 25
QUESTION 1 / 25
A liquid has a vapor density of 3.0. When it is released and evaporates, where will its vapors most likely accumulate?
Choose one answer below.
A
High near the ceiling
✓
B
Low along the ground and in low areas
✓
C
They will disperse evenly in all directions
✓
D
Only in direct sunlight
✓
QUESTION 2 / 25
A photoionization detector (PID) is best described as an instrument that detects:
Choose one answer below.
A
The percentage of oxygen in an atmosphere
✓
B
Many volatile organic compounds by ionizing them with ultraviolet light
✓
C
Only the lower explosive limit of methane
✓
D
Gamma radiation dose rate
✓
QUESTION 3 / 25
On a combustible gas indicator (CGI), a common action level that triggers evacuation or withdrawal in many response protocols is a reading of:
Choose one answer below.
A
10% of the lower explosive limit (LEL)
✓
B
100% of the upper explosive limit (UEL)
✓
C
50% of the IDLH
✓
D
23.5% oxygen
✓
QUESTION 4 / 25
Which DOT hazard class number is assigned to corrosive materials?
Choose one answer below.
A
Class 3
✓
B
Class 6
✓
C
Class 8
✓
D
Class 2
✓
QUESTION 5 / 25
An EPA Level A protective ensemble is required when responders need:
Choose one answer below.
A
The highest level of respiratory and vapor-tight skin protection
✓
B
Only splash protection with no respiratory hazard
✓
C
Protection from nuisance dust only
✓
D
No protection because the product is identified as non-hazardous
✓
QUESTION 6 / 25
With respect to chemical-protective clothing, 'permeation' specifically refers to:
Choose one answer below.
A
A chemical moving through the suit material at a molecular level
✓
B
A chemical passing through zippers, seams or pinholes
✓
C
The suit material swelling, cracking or dissolving
✓
D
Liquid splashing onto the outside of the suit
✓
QUESTION 7 / 25
In the NFPA 704 marking system, the blue quadrant of the diamond represents which hazard?
Choose one answer below.
A
Flammability
✓
B
Health
✓
C
Instability/reactivity
✓
D
Special hazards such as water reactivity
✓
QUESTION 8 / 25
The term IDLH stands for and is used to describe:
Choose one answer below.
A
A concentration that is Immediately Dangerous to Life or Health
✓
B
The lowest concentration that can be smelled
✓
C
The legal 8-hour average exposure limit
✓
D
The point at which a vapor will ignite
✓
QUESTION 9 / 25
A BLEVE is most accurately described as:
Choose one answer below.
A
A boiling-liquid expanding-vapor explosion of a pressurized container
✓
B
A slow chemical reaction that consumes oxygen
✓
C
A detonation of a Class 1 explosive only
✓
D
A static-electricity spark with no fuel present
✓
QUESTION 10 / 25
The orange-bordered pages of the DOT Emergency Response Guidebook (ERG) provide:
Choose one answer below.
A
Numerical index of UN/ID numbers
✓
B
Guide pages with emergency response actions for groups of materials
✓
C
Alphabetical index of material names
✓
D
Initial isolation and protective action distances
✓
QUESTION 11 / 25
The normal range of oxygen concentration in air, used as a benchmark on an oxygen meter, is:
Choose one answer below.
A
10.5% to 15.5%
✓
B
19.5% to 23.5%
✓
C
25% to 30%
✓
D
0% to 5%
✓
QUESTION 12 / 25
Before each use, a responder confirms a monitor responds correctly to a known gas concentration without making adjustments. This quick verification is called a:
Choose one answer below.
A
Full span calibration
✓
B
Bump test (functional test)
✓
C
Zero drift correction
✓
D
Permeation test
✓
QUESTION 13 / 25
A chemical with a flash point of 40 degrees F and a low boiling point is released on a warm day. The most immediate concern from these properties is:
Choose one answer below.
A
The material is non-flammable and inert
✓
B
Flammable vapors are being produced and can ignite
✓
C
The material can only burn if heated above 500 degrees F
✓
D
There is no vapor hazard because it is a liquid
✓
QUESTION 14 / 25
Which route of exposure involves a chemical entering the body through a cut, puncture or needle stick?
Choose one answer below.
A
Inhalation
✓
B
Absorption
✓
C
Ingestion
✓
D
Injection
✓
QUESTION 15 / 25
The dose-response relationship in toxicology expresses the principle that:
Choose one answer below.
A
All chemicals are equally toxic at any amount
✓
B
The magnitude of a harmful effect generally increases with the dose received
✓
C
Only the route of exposure matters, not the amount
✓
D
Chronic effects appear instantly upon any contact
✓
QUESTION 16 / 25
A material is described as an 'oxidizer' (DOT Class 5.1). Its primary additional hazard at an incident is that it can:
Choose one answer below.
A
Absorb all surrounding heat and cool a fire
✓
B
Supply oxygen that intensifies or sustains the combustion of other materials
✓
C
Neutralize acids on contact
✓
D
Prevent any fire from starting
✓
QUESTION 17 / 25
Technical decontamination is best described as:
Choose one answer below.
A
A formal, methodical process to remove or neutralize contaminants from responders and equipment
✓
B
Rapid removal of gross contamination from a victim in seconds
✓
C
A process that only applies to civilian victims
✓
D
Disposal of contaminated water into a storm drain
✓
QUESTION 18 / 25
On a transport vehicle, a four-digit number displayed on an orange panel or placard most directly tells responders:
Choose one answer below.
A
The shipper's phone number
✓
B
The UN/NA identification number for the material
✓
C
The vehicle's license plate
✓
D
The total weight of the load
✓
QUESTION 19 / 25
Colorimetric detector tubes work by:
Choose one answer below.
A
Measuring radiation by counting ionizing events
✓
B
Producing a color change of a chemical reagent that indicates the presence and concentration of a specific gas
✓
C
Detecting all volatile organics with a UV lamp
✓
D
Reading the percent oxygen electrochemically
✓
QUESTION 20 / 25
A specific gravity less than 1.0 for a water-insoluble liquid tells a specialist that the spilled product will:
Choose one answer below.
A
Sink to the bottom of a body of water
✓
B
Float on top of water
✓
C
Instantly dissolve in water
✓
D
Turn into a gas immediately
✓
QUESTION 21 / 25
Within the general hazardous-materials behavior model, the correct sequence of events leading to harm is:
Choose one answer below.
A
Harm, then stress, then breach
✓
B
Stress, breach, release, dispersion/engulf, contact, harm
✓
C
Release, harm, stress, breach
✓
D
Contact, dispersion, stress, harm
✓
QUESTION 22 / 25
A primary role of the Hazardous Materials Specialist relative to the Hazardous Materials Technician is to:
Choose one answer below.
A
Replace the incident commander on all incidents
✓
B
Provide more specialized, directed knowledge and act as a liaison with government authorities and specialist employees
✓
C
Perform only awareness-level isolation duties
✓
D
Avoid the warm and hot zones entirely at all times
✓
QUESTION 23 / 25
A material is labeled 'water-reactive' (special hazard W with a slash in NFPA 704). The most appropriate immediate concern is that applying water may:
Choose one answer below.
A
Always safely extinguish the material
✓
B
Cause a dangerous reaction such as heat, flammable gas or violent release
✓
C
Have no effect at all
✓
D
Convert the material into an inert solid
✓
QUESTION 24 / 25
Which document accompanying a chemical product provides detailed hazard, handling, exposure-limit and first-aid information in a standardized 16-section format?
Choose one answer below.
A
The shipping bill of lading only
✓
B
The Safety Data Sheet (SDS)
✓
C
The vehicle inspection log
✓
D
The NFPA 704 placard
✓
QUESTION 25 / 25
The green-bordered section of the ERG provides which information for certain highlighted materials?
Choose one answer below.
A
Guide pages for fire and spill response
✓
B
Initial isolation and protective action distances
✓
C
An alphabetical list of all materials
✓
D
Telephone numbers for chemical manufacturers
✓
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