2025 NCSO Exam Questions with
100% Correct Answers Graded A+
Complex Mixture
A mixture that is a combination of many chemicals, has a commonly known
generic name and is any of the following: naturally occurring, a fraction of
naturally occuring mixture that results from a separation process, a modification
of a naturally occurring mixture, a modification of a fraction of naturally occurring
mixture that results from a chemical modification process.
Constructor
The contractor, employer or other person who enters into an agreement with the
owner of the work site to be the prime contractor. The constructor has the overall
responsibility for health and safety on the worksite.
Critical Task
A task that has the potential to produce major loss to people, equipment, process
or the environment.
Cumulative Toxic Effects
Effects that usually occur after long term exposure to a substance. Individual
exposures occur many times and the effects accumulate. Even very small
individual exposures may result in a toxic effect.
,Decomposition
The breakdown of a material into two or more different materials.
Documentation, Observations and Interviews (DOI)
These are the techniques used to verify the effectiveness of a health and safety
program (also referred to as verification techniques)
Due Diligence
In legal terms, this is the requirement of a company/employer to provide safe
work conditions through taking reasonable steps to prevent incidents from
occurring.
Employee
An individual who works for an employer or organization and is compensated for
their services. This person may be full-time, part-time or retained on a contractual
basis.
Engineering Controls
Measures for eliminating or reducing hazards to which workers may be exposed.
Examples include: the substitution of less hazardous products, enclosure of
processes to prevent the release of hazardous materials, or installation of local
exhaust ventilation to remove air borne contaminants at their point(s) of
generation.
Excavation
Any cut, cavity, trench or depression in the earth's surface resulting from rock or
soil removal.
, Exposure Limits
The concentrations of airborne chemicals and materials that worker exposure
may not exceed. Exposure limits have various names and often have different
numerical values in different jurisdictions. In Ontario these are called
Occupational Exposure Limits (OELs).
First Aid Measures
The main first aid actions to be taken if a worker is seriously overexposed, often
described in a section of the WHMIS SDS.
Follow-Up
The term used to indicate an action (usually hazard control) that should take place
based on the recommendations in accident/incident reports and hazard
assessments.
Frequency
Is how often a person would be exposed to a given hazard.
Generic WHMIS Worker Education
The component of the WHMIS worker education program that includes a general
introduction to WHMIS, training in the required content of WHMIS labels and
SDSs, and training in the purpose and significance of that information to workers'
health and safety on the job.
GHS
Globally Harmonized System of Classification and Labelling of Chemicals
100% Correct Answers Graded A+
Complex Mixture
A mixture that is a combination of many chemicals, has a commonly known
generic name and is any of the following: naturally occurring, a fraction of
naturally occuring mixture that results from a separation process, a modification
of a naturally occurring mixture, a modification of a fraction of naturally occurring
mixture that results from a chemical modification process.
Constructor
The contractor, employer or other person who enters into an agreement with the
owner of the work site to be the prime contractor. The constructor has the overall
responsibility for health and safety on the worksite.
Critical Task
A task that has the potential to produce major loss to people, equipment, process
or the environment.
Cumulative Toxic Effects
Effects that usually occur after long term exposure to a substance. Individual
exposures occur many times and the effects accumulate. Even very small
individual exposures may result in a toxic effect.
,Decomposition
The breakdown of a material into two or more different materials.
Documentation, Observations and Interviews (DOI)
These are the techniques used to verify the effectiveness of a health and safety
program (also referred to as verification techniques)
Due Diligence
In legal terms, this is the requirement of a company/employer to provide safe
work conditions through taking reasonable steps to prevent incidents from
occurring.
Employee
An individual who works for an employer or organization and is compensated for
their services. This person may be full-time, part-time or retained on a contractual
basis.
Engineering Controls
Measures for eliminating or reducing hazards to which workers may be exposed.
Examples include: the substitution of less hazardous products, enclosure of
processes to prevent the release of hazardous materials, or installation of local
exhaust ventilation to remove air borne contaminants at their point(s) of
generation.
Excavation
Any cut, cavity, trench or depression in the earth's surface resulting from rock or
soil removal.
, Exposure Limits
The concentrations of airborne chemicals and materials that worker exposure
may not exceed. Exposure limits have various names and often have different
numerical values in different jurisdictions. In Ontario these are called
Occupational Exposure Limits (OELs).
First Aid Measures
The main first aid actions to be taken if a worker is seriously overexposed, often
described in a section of the WHMIS SDS.
Follow-Up
The term used to indicate an action (usually hazard control) that should take place
based on the recommendations in accident/incident reports and hazard
assessments.
Frequency
Is how often a person would be exposed to a given hazard.
Generic WHMIS Worker Education
The component of the WHMIS worker education program that includes a general
introduction to WHMIS, training in the required content of WHMIS labels and
SDSs, and training in the purpose and significance of that information to workers'
health and safety on the job.
GHS
Globally Harmonized System of Classification and Labelling of Chemicals
