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Hazmat Operations Practice Questions - NFPA 470 Hazardous Materials Operations Exam
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Question
1
of 25
QUESTION 1 / 25
At a hazmat incident, what is the PRIMARY role of an Operations-level responder under NFPA 470 Chapter 7?
Choose one answer below.
A
Approach the point of release to plug or patch the container
✓
B
Perform defensive actions outside the hot zone to protect people, property, and the environment
✓
C
Establish the federal on-scene coordinator role
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D
Act as the medical branch director for contaminated patients
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QUESTION 2 / 25
Which technique places an impervious barrier across a watercourse to STOP flow of liquid product?
Choose one answer below.
A
Diking
✓
B
Damming
✓
C
Diverting
✓
D
Retention
✓
QUESTION 3 / 25
An Operations responder is sizing up a chlorine tank-car release. Which initial isolation distance source should they consult FIRST?
Choose one answer below.
A
ATSDR ToxFAQs sheets
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B
DOT Emergency Response Guidebook (ERG) green-page tables
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C
NFPA 704 placard on the facility wall
✓
D
OSHA permissible exposure limit (PEL) for chlorine
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QUESTION 4 / 25
Which EPA PPE level provides full chemical encapsulation with SCBA worn inside the suit?
Choose one answer below.
A
Level A
✓
B
Level B
✓
C
Level C
✓
D
Level D
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QUESTION 5 / 25
Which decontamination method is used to RAPIDLY remove the bulk of contaminant from a victim before more thorough decon?
Choose one answer below.
A
Technical decontamination
✓
B
Gross decontamination
✓
C
Mass decontamination
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D
Quarantine decontamination
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QUESTION 6 / 25
What is the function of the warm zone at a hazmat incident?
Choose one answer below.
A
Contains the point of release and offensive operations
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B
Houses the public information officer and media
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C
Serves as the contamination reduction corridor where decon occurs
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D
Is reserved for unprotected bystanders
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QUESTION 7 / 25
A 4-gas meter reads 19.0% oxygen. How should an Operations responder interpret this reading?
Choose one answer below.
A
Normal — atmosphere is safe to enter
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B
Oxygen-deficient — atmosphere is below 19.5% and unsafe without SCBA
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C
Oxygen-enriched — risk of fire is increased
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D
Reading is invalid; recalibrate the meter
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QUESTION 8 / 25
Under NFPA 470 Chapter 7, what is the difference between confinement and containment?
Choose one answer below.
A
Confinement is offensive; containment is defensive
✓
B
Confinement stops product spread after release; containment stops the release at the source
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C
Confinement is only for liquids; containment is only for gases
✓
D
The terms are interchangeable in NFPA 470
✓
QUESTION 9 / 25
Which mission-specific competency under NFPA 470 Chapter 9 covers responders who set up and operate the decon corridor?
Choose one answer below.
A
Product control specialist
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B
Mission-specific decontamination
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C
Evidence preservation and sampling
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D
Air monitoring and sampling
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QUESTION 10 / 25
What is the minimum passing score on each NFPA 470 mission-specific module taken in addition to the core Operations exam?
Choose one answer below.
A
60%
✓
B
70%
✓
C
75%
✓
D
80%
✓
QUESTION 11 / 25
Vapor suppression of a flammable liquid spill is BEST achieved using which agent?
Choose one answer below.
A
Class A foam
✓
B
Aqueous film-forming foam (AFFF) or alcohol-resistant AFFF
✓
C
Dry chemical (Purple-K)
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D
Plain water spray
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QUESTION 12 / 25
Vapor dispersion uses fog streams to do what?
Choose one answer below.
A
Dilute and move flammable or toxic vapors away from exposures
✓
B
Cool the contents of a leaking pressure vessel
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C
Replace SCBA in oxygen-deficient atmospheres
✓
D
Wash contaminated victims through a decon line
✓
QUESTION 13 / 25
Which NFPA standard governs vapor-protective ensembles for chemical emergencies (Level A)?
Choose one answer below.
A
NFPA 1971
✓
B
NFPA 1991
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C
NFPA 1992
✓
D
NFPA 1994
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QUESTION 14 / 25
Structural firefighting PPE provides limited protection against hazardous materials because it is NOT designed to:
Choose one answer below.
A
Resist heat from flame exposure
✓
B
Resist liquid or vapor penetration by toxic chemicals
✓
C
Provide impact protection
✓
D
Withstand water spray during firefighting
✓
QUESTION 15 / 25
An air-purifying respirator (APR) is acceptable for use ONLY when which condition is met?
Choose one answer below.
A
The atmosphere contains less than 5% oxygen
✓
B
The contaminant, its concentration, and that the atmosphere is not IDLH are all known
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C
Any contaminant is present in any concentration
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D
The responder is performing offensive operations
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QUESTION 16 / 25
Which decon corridor configuration is MOST appropriate for a mass-casualty incident with 50 ambulatory victims?
Choose one answer below.
A
Single technical decon line with one station
✓
B
High-volume, low-pressure spray showers using booster lines or master streams in a corridor
✓
C
Individual emergency decon for each victim, one at a time
✓
D
Wait for a federal decon team before treating any victims
✓
QUESTION 17 / 25
Which detection device is BEST suited for measuring volatile organic compounds (VOCs) at the parts-per-million level?
Choose one answer below.
A
4-gas meter (LEL/O2/CO/H2S)
✓
B
pH paper
✓
C
Photo-ionization detector (PID)
✓
D
Radiation pancake probe
✓
QUESTION 18 / 25
A 4-gas meter alarms at 10% LEL. What does this typically indicate, and what action is appropriate?
Choose one answer below.
A
The atmosphere is at full lower explosive limit — flash will occur immediately
✓
B
A defined fraction of the lower explosive limit is present; ventilate and reassess; do not perform ignition tasks
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C
Oxygen is being consumed — increase oxygen with a hose stream
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D
Carbon monoxide is at lethal levels — initiate cardiac monitoring
✓
QUESTION 19 / 25
What does pH paper indicate?
Choose one answer below.
A
Concentration of carbon monoxide in air
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B
Whether a liquid is acidic, neutral, or basic
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C
Type of ionizing radiation present
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D
Concentration of flammable vapor
✓
QUESTION 20 / 25
A radiation pancake probe is MOST sensitive to which radiation types?
Choose one answer below.
A
Gamma only
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B
Neutron only
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C
Alpha and beta
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D
X-ray only
✓
QUESTION 21 / 25
Under ICS, what TYPE incident is a routine hazmat release contained at the local level with limited resources?
Choose one answer below.
A
Type 1
✓
B
Type 2
✓
C
Type 3
✓
D
Type 4 or Type 5
✓
QUESTION 22 / 25
Which ICS Command Staff position is responsible for safety oversight at a hazmat incident?
Choose one answer below.
A
Public Information Officer
✓
B
Liaison Officer
✓
C
Safety Officer
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D
Operations Section Chief
✓
QUESTION 23 / 25
Which zone houses the Incident Command Post, staging, and support personnel?
Choose one answer below.
A
Hot zone
✓
B
Warm zone
✓
C
Cold zone
✓
D
Decontamination corridor
✓
QUESTION 24 / 25
Diking is used to:
Choose one answer below.
A
Stop liquid flow across a stream by building across the channel
✓
B
Build a barrier around or in front of a release to contain it
✓
C
Channel runoff into a remote retention area
✓
D
Suppress vapors with foam
✓
QUESTION 25 / 25
Diverting is BEST described as:
Choose one answer below.
A
Stopping liquid completely across a stream
✓
B
Redirecting liquid flow around or away from an exposure
✓
C
Containing vapor with a foam blanket
✓
D
Plugging a leaking valve at the source
✓
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