NCCER Core Curriculum Certification
Practice Exam 100 Questions And
Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A Instant
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1. According to the hierarchy of controls, which is the most effective method
for protecting workers from an occupational hazard?
A) Personal Protective Equipment (PPE)
B) Engineering Controls
C) Administrative Controls
D) Work Practices
B) Engineering Controls
Rationale: The hierarchy of controls prioritizes eliminating hazards at the
source. Engineering controls such as machine guards and ventilation are more
effective than administrative controls or PPE, which is considered the last line of
defense .
2. When you identify a "near miss" on a job site, you should:
A) Ignore it since no one was hurt
B) Report it to your supervisor immediately
C) Wait to see if it happens again
D) Fix the issue yourself without telling anyone
B) Report it to your supervisor immediately
Rationale: Near misses are indicators of potential accidents. Reporting them
allows for hazard correction before an actual injury occurs .
,3. Which of the following is a primary cause of struck-by injuries on a
construction site?
A) Slipping on wet concrete
B) Backing construction vehicles
C) Inhaling silica dust
D) Repetitive hammering
B) Backing construction vehicles
Rationale: Struck-by hazards include moving vehicles, especially those backing
up, falling tools, and flying debris. This is a leading cause of construction
fatalities .
4. OSHA requires that a ladder set on a surface must be placed at a 4:1 ratio.
If you climb 16 feet up the wall, the base of the ladder should be ___ feet
away from the wall.
A) 2 feet
B) 4 feet
C) 6 feet
D) 8 feet
B) 4 feet
Rationale: The 4:1 ratio means for every 4 feet of height, the base moves 1 foot
out. 16 divided by 4 equals 4 feet .
5. What is the maximum pressure allowed for acetylene gas when drawn
from a manifold or cylinder?
A) 5 PSI
B) 15 PSI
C) 30 PSI
D) 50 PSI
B) 15 PSI
Rationale: Acetylene becomes unstable and can decompose explosively when
pressurized above 15 PSI .
, 6. Which type of fire extinguisher is rated for energized electrical equipment
fires?
A) Class A
B) Class B
C) Class C
D) Class D
C) Class C
Rationale: Class C extinguishers contain non-conductive agents like carbon
dioxide or dry chemical that are safe for live electricity. Water, a Class A
extinguisher, conducts electricity and creates a shock hazard .
7. According to the NCCER curriculum, what is the leading cause of death in
the construction industry?
A) Electrocution
B) Caught-in/between
C) Falls
D) Struck-by
C) Falls
Rationale: Falls consistently account for the highest number of fatalities in
construction, emphasizing the need for guardrails, harnesses, and safety nets .
8. What does the term "Lockout/Tagout" (LOTO) specifically prevent?
A) Theft of tools
B) Theft of materials
C) Accidental start-up of machinery
D) Exposure to chemical spills
C) Accidental start-up of machinery
Rationale: LOTO procedures ensure that energy sources are isolated and locked
out before maintenance, preventing unexpected energization .
9. If an extension cord feels warm to the touch, you should:
A) Continue using it; this is normal for long runs
B) Wrap it tightly with electrical tape
Practice Exam 100 Questions And
Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A Instant
Download Pdf
1. According to the hierarchy of controls, which is the most effective method
for protecting workers from an occupational hazard?
A) Personal Protective Equipment (PPE)
B) Engineering Controls
C) Administrative Controls
D) Work Practices
B) Engineering Controls
Rationale: The hierarchy of controls prioritizes eliminating hazards at the
source. Engineering controls such as machine guards and ventilation are more
effective than administrative controls or PPE, which is considered the last line of
defense .
2. When you identify a "near miss" on a job site, you should:
A) Ignore it since no one was hurt
B) Report it to your supervisor immediately
C) Wait to see if it happens again
D) Fix the issue yourself without telling anyone
B) Report it to your supervisor immediately
Rationale: Near misses are indicators of potential accidents. Reporting them
allows for hazard correction before an actual injury occurs .
,3. Which of the following is a primary cause of struck-by injuries on a
construction site?
A) Slipping on wet concrete
B) Backing construction vehicles
C) Inhaling silica dust
D) Repetitive hammering
B) Backing construction vehicles
Rationale: Struck-by hazards include moving vehicles, especially those backing
up, falling tools, and flying debris. This is a leading cause of construction
fatalities .
4. OSHA requires that a ladder set on a surface must be placed at a 4:1 ratio.
If you climb 16 feet up the wall, the base of the ladder should be ___ feet
away from the wall.
A) 2 feet
B) 4 feet
C) 6 feet
D) 8 feet
B) 4 feet
Rationale: The 4:1 ratio means for every 4 feet of height, the base moves 1 foot
out. 16 divided by 4 equals 4 feet .
5. What is the maximum pressure allowed for acetylene gas when drawn
from a manifold or cylinder?
A) 5 PSI
B) 15 PSI
C) 30 PSI
D) 50 PSI
B) 15 PSI
Rationale: Acetylene becomes unstable and can decompose explosively when
pressurized above 15 PSI .
, 6. Which type of fire extinguisher is rated for energized electrical equipment
fires?
A) Class A
B) Class B
C) Class C
D) Class D
C) Class C
Rationale: Class C extinguishers contain non-conductive agents like carbon
dioxide or dry chemical that are safe for live electricity. Water, a Class A
extinguisher, conducts electricity and creates a shock hazard .
7. According to the NCCER curriculum, what is the leading cause of death in
the construction industry?
A) Electrocution
B) Caught-in/between
C) Falls
D) Struck-by
C) Falls
Rationale: Falls consistently account for the highest number of fatalities in
construction, emphasizing the need for guardrails, harnesses, and safety nets .
8. What does the term "Lockout/Tagout" (LOTO) specifically prevent?
A) Theft of tools
B) Theft of materials
C) Accidental start-up of machinery
D) Exposure to chemical spills
C) Accidental start-up of machinery
Rationale: LOTO procedures ensure that energy sources are isolated and locked
out before maintenance, preventing unexpected energization .
9. If an extension cord feels warm to the touch, you should:
A) Continue using it; this is normal for long runs
B) Wrap it tightly with electrical tape
