NCCER CORE CURRICULUM MODULE 1 EXAM QUESTIONS & ANSWERS 2026-2027 |…
P R O F E S S I O N A L P R A C T I C E M AT E R I A L S
NCCER Core Curriculum
Module 1 Exam Questions &
Answers 2026-2027 |
Comprehensive Review
(Rationales)
Verified Answers Exam Ready With Rationales 138 QUESTIONS
DOCUMENT OVERVIEW
This comprehensive review document contains 138 questions with pre-provided correct
answers and detailed rationales, covering fundamental construction safety principles. It
offers a thorough study tool for individuals preparing for NCCER Core Curriculum Module 1
certification. This resource directly aids in review and study by presenting key concepts and
their explanations, ensuring learners grasp essential safety knowledge.
TOPICS
• General Safety & Definitions • Hazardous Materials & Fire Safety
• Welding & Confined Spaces • Trenching & Excavation
• Scaffolds & Ladders
Page 1
, E XA M Q U EST I O N S
Q1 QUESTION 1 OF 138
Accident
CORRECT ANSWER
According to the US Occupational Safety and Health Administration (OSHA), an unplanned
event that results in personal injury and/or property damage.
RATIONALE
According to the US Occupational Safety and Health Administration (OSHA), an unplanned event
that results in personal injury and/or property damage., as defined by OSHA, is an unforeseen
occurrence that leads to harm to individuals or damage to property. This definition emphasizes the
unexpected nature of the event and its negative consequences.
Q2 QUESTION 2 OF 138
Combustible
CORRECT ANSWER
Capable of easily igniting and rapidly burning; used to describe a fuel with a flash point at, or
above, 100 F (38 C).
RATIONALE
The term "combustible" describes a substance's ability to ignite and burn quickly. This classification
is specifically applied to fuels that have a flash point of 100 degrees Fahrenheit (38 degrees Celsius)
or higher.
Q3 QUESTION 3 OF 138
Competent Person
Page 2
, CORRECT ANSWER
A person who is capable of identifying existing and predictable hazards in the surroundings or
working conditions that are unsanitary, hazardous, or dangerous to employees, and who has
authorization to take prompt corrective measures to eliminate them.
RATIONALE
A competent person is defined by their ability to recognize potential dangers in their work
environment and their authority to implement immediate solutions. This dual capability—
identification of hazards and the power to rectify them—is central to ensuring workplace safety.
Q4 QUESTION 4 OF 138
Confined Space
CORRECT ANSWER
A work area large enough for a person to work, but arranged in such a way that an employee
must physically enter the space to perform work. A confined space has a limited or restricted
means of entry and exit. It is not designed for continuous work. Tanks, vessels, silos, pits, vaults,
and hoppers are examples of confined spaces.
Q5 QUESTION 5 OF 138
Flammable
CORRECT ANSWER
Capable of easily igniting and rapidly burning; used to describe a fuel with a flash point below
100 F (38 C).
RATIONALE
The term "flammable" describes a substance's propensity to ignite and burn quickly. This
characteristic is quantitatively defined by its flash point, which is the lowest temperature at which a
substance can vaporize to form an ignitable mixture in air.
Q6 QUESTION 6 OF 138
Ground Fault
Page 3
, CORRECT ANSWER
Incidental grounding of a conducting electrical wire.
RATIONALE
A ground fault occurs when a live electrical conductor unintentionally comes into contact with a
grounded surface. This incidental grounding creates an unintended path for electricity to flow to
the earth.
Q7 QUESTION 7 OF 138
Hazard Communication (HAZCOM) Standard
CORRECT ANSWER
The OSHA standard that requires contractors to educate employees about hazardous
chemicals on the job site and how to work with them safely.
RATIONALE
The OSHA standard that requires contractors to educate employees about hazardous chemicals on
the job site and how to work with them safely., established by OSHA, mandates that employers
inform their employees about the presence of hazardous chemicals within the workplace. This
standard requires employers to provide training on how to identify these hazards and implement
safe work practices to mitigate risks.
Q8 QUESTION 8 OF 138
Hydraulic
CORRECT ANSWER
Powered by fluid under pressure.
RATIONALE
The term "hydraulic" refers to systems that utilize fluid, typically oil or water, to transmit power. This
power is generated and controlled by the pressure of the fluid within a closed system.
Page 4
P R O F E S S I O N A L P R A C T I C E M AT E R I A L S
NCCER Core Curriculum
Module 1 Exam Questions &
Answers 2026-2027 |
Comprehensive Review
(Rationales)
Verified Answers Exam Ready With Rationales 138 QUESTIONS
DOCUMENT OVERVIEW
This comprehensive review document contains 138 questions with pre-provided correct
answers and detailed rationales, covering fundamental construction safety principles. It
offers a thorough study tool for individuals preparing for NCCER Core Curriculum Module 1
certification. This resource directly aids in review and study by presenting key concepts and
their explanations, ensuring learners grasp essential safety knowledge.
TOPICS
• General Safety & Definitions • Hazardous Materials & Fire Safety
• Welding & Confined Spaces • Trenching & Excavation
• Scaffolds & Ladders
Page 1
, E XA M Q U EST I O N S
Q1 QUESTION 1 OF 138
Accident
CORRECT ANSWER
According to the US Occupational Safety and Health Administration (OSHA), an unplanned
event that results in personal injury and/or property damage.
RATIONALE
According to the US Occupational Safety and Health Administration (OSHA), an unplanned event
that results in personal injury and/or property damage., as defined by OSHA, is an unforeseen
occurrence that leads to harm to individuals or damage to property. This definition emphasizes the
unexpected nature of the event and its negative consequences.
Q2 QUESTION 2 OF 138
Combustible
CORRECT ANSWER
Capable of easily igniting and rapidly burning; used to describe a fuel with a flash point at, or
above, 100 F (38 C).
RATIONALE
The term "combustible" describes a substance's ability to ignite and burn quickly. This classification
is specifically applied to fuels that have a flash point of 100 degrees Fahrenheit (38 degrees Celsius)
or higher.
Q3 QUESTION 3 OF 138
Competent Person
Page 2
, CORRECT ANSWER
A person who is capable of identifying existing and predictable hazards in the surroundings or
working conditions that are unsanitary, hazardous, or dangerous to employees, and who has
authorization to take prompt corrective measures to eliminate them.
RATIONALE
A competent person is defined by their ability to recognize potential dangers in their work
environment and their authority to implement immediate solutions. This dual capability—
identification of hazards and the power to rectify them—is central to ensuring workplace safety.
Q4 QUESTION 4 OF 138
Confined Space
CORRECT ANSWER
A work area large enough for a person to work, but arranged in such a way that an employee
must physically enter the space to perform work. A confined space has a limited or restricted
means of entry and exit. It is not designed for continuous work. Tanks, vessels, silos, pits, vaults,
and hoppers are examples of confined spaces.
Q5 QUESTION 5 OF 138
Flammable
CORRECT ANSWER
Capable of easily igniting and rapidly burning; used to describe a fuel with a flash point below
100 F (38 C).
RATIONALE
The term "flammable" describes a substance's propensity to ignite and burn quickly. This
characteristic is quantitatively defined by its flash point, which is the lowest temperature at which a
substance can vaporize to form an ignitable mixture in air.
Q6 QUESTION 6 OF 138
Ground Fault
Page 3
, CORRECT ANSWER
Incidental grounding of a conducting electrical wire.
RATIONALE
A ground fault occurs when a live electrical conductor unintentionally comes into contact with a
grounded surface. This incidental grounding creates an unintended path for electricity to flow to
the earth.
Q7 QUESTION 7 OF 138
Hazard Communication (HAZCOM) Standard
CORRECT ANSWER
The OSHA standard that requires contractors to educate employees about hazardous
chemicals on the job site and how to work with them safely.
RATIONALE
The OSHA standard that requires contractors to educate employees about hazardous chemicals on
the job site and how to work with them safely., established by OSHA, mandates that employers
inform their employees about the presence of hazardous chemicals within the workplace. This
standard requires employers to provide training on how to identify these hazards and implement
safe work practices to mitigate risks.
Q8 QUESTION 8 OF 138
Hydraulic
CORRECT ANSWER
Powered by fluid under pressure.
RATIONALE
The term "hydraulic" refers to systems that utilize fluid, typically oil or water, to transmit power. This
power is generated and controlled by the pressure of the fluid within a closed system.
Page 4
