ACSA NCSO EXAM 200 ACTUAL QUESTIONS AND CORRECT
ANSWERS WITH RATIONALE LATEST 2026 ALREADY
GRADED A+ ASSURED PASS
This complete set of 200 unique multiple-choice questions is designed for
candidates preparing for the ACSA NCSO (National Construction Safety
Officer) exam. It comprehensively covers the NCSO certification
requirements, including hazard assessment models (formal and site-specific),
the hierarchy of controls, OH&S legislation (Acts, Regulations, Codes), due
diligence, WHMIS 2015 (GHS), safety metrics (LTFR, TRIF, IRS), incident
investigation, confined space entry, lockout/tagout, and the COR/SECOR
audit elements. Each question includes a correct answer and a detailed
rationale explaining the underlying legal, procedural, or safety management
principle. This collection serves as an intensive study resource to help
candidates identify knowledge gaps, reinforce critical safety concepts, and
build the confidence needed to achieve the required 75% passing score on
both National and Provincial exams.
1. Which of the following is the highest-priority step in the Hierarchy of Controls?
a) Personal Protective Equipment (PPE)
b) Administrative controls
c) Engineering controls
d) Elimination
Answer: d) Elimination
Rationale: Elimination removes the hazard entirely and is therefore the most
effective control, placed at the top of the hierarchy of controls. The other options
are less effective because they only reduce or manage the risk rather than remove
it.
2. A Field Level Hazard Assessment (FLHA) is typically completed:
a) Once per project lifecycle
b) At the start of each shift or before a specific task
c) Only after an incident occurs
d) Annually for the entire site
Answer: b) At the start of each shift or before a specific task
,Rationale: FLHAs are short-term assessments performed before a task or shift to
identify immediate hazards that may have changed since the last formal
assessment.
3. In a risk matrix, which combination yields the highest risk rating?
a) Low probability, low severity
b) High probability, low severity
c) Low probability, high severity
d) High probability, high severity
Answer: d) High probability, high severity
Rationale: High likelihood combined with high consequence results in the greatest
risk score. This combination represents the most critical risk that requires
immediate attention.
4. What is a Health and Safety Management System (HSMS)?
a) A system for tracking employee attendance
b) A complete system that maintains high standards throughout every part of a
company's organization
c) A software program for filing safety reports
d) A system for managing financial records
Answer: b) A complete system that maintains high standards throughout every part
of a company's organization
Rationale: An HSMS is a comprehensive system that integrates health and safety
into all aspects of a company's operations, ensuring consistent standards across the
organization.
5. What are the three factors of Due Diligence?
a) Planning, Organizing, Leading
b) Foreseeability, Preventability, Control
c) Training, Education, Supervision
d) Assessment, Implementation, Monitoring
Answer: b) Foreseeability, Preventability, Control
Rationale: Due diligence requires that a person can foresee potential hazards, take
steps to prevent them, and maintain control over the situation. These three factors
form the foundation of the legal defense of due diligence.
6. What type of losses are costs associated with loss-type incidents?
a) Direct losses
b) Absolute losses
c) Indirect losses
,d) Hidden losses
Answer: b) Absolute losses
Rationale: Absolute losses refer to the direct costs associated with loss-type
incidents, such as medical expenses, property damage, and other measurable
financial impacts.
7. What formula gives you the LTFR (Lost Time Frequency Rate)?
a) (Lost time cases x 200,000) / Total Employee Hours of Exposure
b) (Lost work days x 200,000) / Total employee hours of exposure
c) (lost time cases + medical aids + modified work cases) x 200,000 / Total
employee hours of exposure
d) (Total incidents x 1,000,000) / Total hours worked
Answer: a) (Lost time cases x 200,000) / Total Employee Hours of Exposure
Rationale: The LTFR is a standard safety metric that calculates the number of lost
time injuries per 200,000 hours worked, which represents the equivalent of 100
full-time employees working a year.
8. What formula gives you the IRS (Injury Severity Rate)?
a) (Lost time cases x 200,000) / Total Employee Hours of Exposure
b) (Lost work days x 200,000) / Total employee hours of exposure
c) (lost time cases + medical aids + modified work cases) x 200,000 / Total
employee hours of exposure
d) (Total days lost x 1,000) / Total hours worked
Answer: b) (Lost work days x 200,000) / Total employee hours of exposure
Rationale: The IRS measures the severity of injuries by calculating the number of
work days lost per 200,000 hours worked, providing insight into how serious the
incidents are.
9. What formula gives you the TRIF (Total Recordable Incident Frequency)?
a) (Lost time cases x 200,000) / Total Employee Hours of Exposure
b) (Lost work days x 200,000) / Total employee hours of exposure
c) (lost time cases + medical aids + modified work cases) x 200,000 / Total
employee hours of exposure
d) (Total recordables x 1,000,000) / Total hours worked
Answer: c) (lost time cases + medical aids + modified work cases) x 200,000 /
Total employee hours of exposure
Rationale: The TRIF is a comprehensive metric that includes all recordable
incidents, including lost time cases, medical aids, and modified work cases,
providing a broader picture of safety performance.
, 10. On a project, whose responsibility is it to develop a collaborative
environmental management program?
a) The safety officer
b) The prime contractor
c) Each subcontractor individually
d) The client
Answer: b) The prime contractor
Rationale: The prime contractor holds the primary responsibility for developing
and implementing a collaborative environmental management program on a project
site, ensuring all parties work together.
11. What is the purpose of an Action Plan?
a) To document all incidents
b) To provide a plan to improve the HSMS over the upcoming year
c) To list all safety violations
d) To assign blame for accidents
Answer: b) To provide a plan to improve the HSMS over the upcoming year
Rationale: An Action Plan outlines specific steps and strategies to enhance the
Health and Safety Management System, setting goals and timelines for continuous
improvement.
12. Corrective actions may vary depending on the level of risk, but they should
always follow what format?
a) OSHA
b) SMART
c) CSA
d) ISO
Answer: b) SMART
Rationale: SMART is an acronym for Specific, Measurable, Attainable, Relevant,
and Time-bound. This format ensures that corrective actions are clear, achievable,
and trackable.
13. What helps to identify how well an HSMS is performing against a standard?
a) Incident reports
b) Audits
c) Employee surveys
d) Safety meetings
Answer: b) Audits
Rationale: Audits systematically evaluate the HSMS against established standards,
identifying strengths and weaknesses to drive improvement.
ANSWERS WITH RATIONALE LATEST 2026 ALREADY
GRADED A+ ASSURED PASS
This complete set of 200 unique multiple-choice questions is designed for
candidates preparing for the ACSA NCSO (National Construction Safety
Officer) exam. It comprehensively covers the NCSO certification
requirements, including hazard assessment models (formal and site-specific),
the hierarchy of controls, OH&S legislation (Acts, Regulations, Codes), due
diligence, WHMIS 2015 (GHS), safety metrics (LTFR, TRIF, IRS), incident
investigation, confined space entry, lockout/tagout, and the COR/SECOR
audit elements. Each question includes a correct answer and a detailed
rationale explaining the underlying legal, procedural, or safety management
principle. This collection serves as an intensive study resource to help
candidates identify knowledge gaps, reinforce critical safety concepts, and
build the confidence needed to achieve the required 75% passing score on
both National and Provincial exams.
1. Which of the following is the highest-priority step in the Hierarchy of Controls?
a) Personal Protective Equipment (PPE)
b) Administrative controls
c) Engineering controls
d) Elimination
Answer: d) Elimination
Rationale: Elimination removes the hazard entirely and is therefore the most
effective control, placed at the top of the hierarchy of controls. The other options
are less effective because they only reduce or manage the risk rather than remove
it.
2. A Field Level Hazard Assessment (FLHA) is typically completed:
a) Once per project lifecycle
b) At the start of each shift or before a specific task
c) Only after an incident occurs
d) Annually for the entire site
Answer: b) At the start of each shift or before a specific task
,Rationale: FLHAs are short-term assessments performed before a task or shift to
identify immediate hazards that may have changed since the last formal
assessment.
3. In a risk matrix, which combination yields the highest risk rating?
a) Low probability, low severity
b) High probability, low severity
c) Low probability, high severity
d) High probability, high severity
Answer: d) High probability, high severity
Rationale: High likelihood combined with high consequence results in the greatest
risk score. This combination represents the most critical risk that requires
immediate attention.
4. What is a Health and Safety Management System (HSMS)?
a) A system for tracking employee attendance
b) A complete system that maintains high standards throughout every part of a
company's organization
c) A software program for filing safety reports
d) A system for managing financial records
Answer: b) A complete system that maintains high standards throughout every part
of a company's organization
Rationale: An HSMS is a comprehensive system that integrates health and safety
into all aspects of a company's operations, ensuring consistent standards across the
organization.
5. What are the three factors of Due Diligence?
a) Planning, Organizing, Leading
b) Foreseeability, Preventability, Control
c) Training, Education, Supervision
d) Assessment, Implementation, Monitoring
Answer: b) Foreseeability, Preventability, Control
Rationale: Due diligence requires that a person can foresee potential hazards, take
steps to prevent them, and maintain control over the situation. These three factors
form the foundation of the legal defense of due diligence.
6. What type of losses are costs associated with loss-type incidents?
a) Direct losses
b) Absolute losses
c) Indirect losses
,d) Hidden losses
Answer: b) Absolute losses
Rationale: Absolute losses refer to the direct costs associated with loss-type
incidents, such as medical expenses, property damage, and other measurable
financial impacts.
7. What formula gives you the LTFR (Lost Time Frequency Rate)?
a) (Lost time cases x 200,000) / Total Employee Hours of Exposure
b) (Lost work days x 200,000) / Total employee hours of exposure
c) (lost time cases + medical aids + modified work cases) x 200,000 / Total
employee hours of exposure
d) (Total incidents x 1,000,000) / Total hours worked
Answer: a) (Lost time cases x 200,000) / Total Employee Hours of Exposure
Rationale: The LTFR is a standard safety metric that calculates the number of lost
time injuries per 200,000 hours worked, which represents the equivalent of 100
full-time employees working a year.
8. What formula gives you the IRS (Injury Severity Rate)?
a) (Lost time cases x 200,000) / Total Employee Hours of Exposure
b) (Lost work days x 200,000) / Total employee hours of exposure
c) (lost time cases + medical aids + modified work cases) x 200,000 / Total
employee hours of exposure
d) (Total days lost x 1,000) / Total hours worked
Answer: b) (Lost work days x 200,000) / Total employee hours of exposure
Rationale: The IRS measures the severity of injuries by calculating the number of
work days lost per 200,000 hours worked, providing insight into how serious the
incidents are.
9. What formula gives you the TRIF (Total Recordable Incident Frequency)?
a) (Lost time cases x 200,000) / Total Employee Hours of Exposure
b) (Lost work days x 200,000) / Total employee hours of exposure
c) (lost time cases + medical aids + modified work cases) x 200,000 / Total
employee hours of exposure
d) (Total recordables x 1,000,000) / Total hours worked
Answer: c) (lost time cases + medical aids + modified work cases) x 200,000 /
Total employee hours of exposure
Rationale: The TRIF is a comprehensive metric that includes all recordable
incidents, including lost time cases, medical aids, and modified work cases,
providing a broader picture of safety performance.
, 10. On a project, whose responsibility is it to develop a collaborative
environmental management program?
a) The safety officer
b) The prime contractor
c) Each subcontractor individually
d) The client
Answer: b) The prime contractor
Rationale: The prime contractor holds the primary responsibility for developing
and implementing a collaborative environmental management program on a project
site, ensuring all parties work together.
11. What is the purpose of an Action Plan?
a) To document all incidents
b) To provide a plan to improve the HSMS over the upcoming year
c) To list all safety violations
d) To assign blame for accidents
Answer: b) To provide a plan to improve the HSMS over the upcoming year
Rationale: An Action Plan outlines specific steps and strategies to enhance the
Health and Safety Management System, setting goals and timelines for continuous
improvement.
12. Corrective actions may vary depending on the level of risk, but they should
always follow what format?
a) OSHA
b) SMART
c) CSA
d) ISO
Answer: b) SMART
Rationale: SMART is an acronym for Specific, Measurable, Attainable, Relevant,
and Time-bound. This format ensures that corrective actions are clear, achievable,
and trackable.
13. What helps to identify how well an HSMS is performing against a standard?
a) Incident reports
b) Audits
c) Employee surveys
d) Safety meetings
Answer: b) Audits
Rationale: Audits systematically evaluate the HSMS against established standards,
identifying strengths and weaknesses to drive improvement.
