300 Practice Questions & Answer Explanations –
Firefighter Candidate Test for California: Complete
Study Guide with Fire Science, Safety, and Entrance
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Question 1
What is the primary method of heat transfer that allows a fire to spread upward
from one floor to the next through open stairwells?
A) Conduction
B) Convection
C) Radiation
D) Direct flame contact
Correct Answer: B
Rationale: Convection transfers heat through the movement of heated gases and
smoke, which rise and can spread fire to upper floors via stairwells, shafts, or
open areas.
Question 2
A firefighter climbs a ladder that is placed at a 75-degree angle against a wall. If
the ladder is 24 feet long, what is the approximate height the firefighter reaches?
A) 20.2 ft
B) 22.1 ft
C) 23.2 ft
D) 24.0 ft
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,Correct Answer: C
Rationale: Height = Ladder length × sin(75°). sin(75°) ≈ 0.9659, so 24 × 0.9659 ≈
23.18 ft, rounded to 23.2 ft.
Question 3
Which class of fire involves energized electrical equipment?
A) Class A
B) Class B
C) Class C
D) Class D
Correct Answer: C
Rationale: Class C fires involve energized electrical components. Using a non-
conductive extinguishing agent is critical.
Question 4
During a size-up at a residential structure fire, you notice a sagging roof and walls
pushing outward. This indicates potential for:
A) Flashover
B) Backdraft
C) Structural collapse
D) Smoke explosion
Correct Answer: C
Rationale: Sagging roof and outward-bowing walls are signs of structural
weakening and imminent collapse, requiring an immediate evacuation.
Question 5
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,Convert 150 psi to kilopascals (kPa). (1 psi = 6.89476 kPa)
A) 896.2 kPa
B) 1034.2 kPa
C) 1200.0 kPa
D) 1500.0 kPa
Correct Answer: B
Rationale: 150 × 6.89476 = 1034.214 kPa ≈ 1034.2 kPa.
Question 6
What is the minimum oxygen concentration in percent that can support
combustion of most ordinary materials?
A) 10%
B) 14%
C) 16%
D) 21%
Correct Answer: B
Rationale: Most materials require at least 14–16% oxygen to sustain combustion.
Normal air has 21%.
Question 7
In the Incident Command System (ICS), which position is responsible for
developing the action plan and assigning resources?
A) Safety Officer
B) Operations Section Chief
C) Planning Section Chief
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, D) Incident Commander
Correct Answer: C
Rationale: The Planning Section Chief leads the planning section, which develops
the Incident Action Plan and tracks resources.
Question 8
A pumper is supplying a hose line with a flow of 250 gpm through a 200-foot, 2½-
inch hose. What is the approximate friction loss per 100 feet using the formula FL
= C × (Q/100)² × (L/100) where C for 2½-inch hose is 2?
A) 12.5 psi
B) 25 psi
C) 50 psi
D) 100 psi
Correct Answer: B
Rationale: Q = 250 gpm, so Q/100 = 2.5. Square: 6.25. C=2 → FL per 100 ft = 2 ×
6.25 = 12.5 psi. For 200 ft total FL = 12.5 × 2 = 25 psi.
Question 9
What is the primary hazard of a backdraft?
A) Rapid fire growth due to oxygen introduction
B) Toxic smoke inhalation
C) Building collapse
D) Explosive release of flammable gases
Correct Answer: D
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