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IICRC HST Exam ACTUAL EXAM ALL 150 QUESTIONS
AND CORRECT ANSWERS LATEST UPDATE THIS
YEAR
IICRC HST Exam Study Guide
Principles of health and safety hazard identification rely on these 3 basic criteria
Recognition - of a hazard or potential hazard
Assessment - and eval of the hazard
Controls - that are implemented to minimize hazard
Hazard
Any source or situation with a potential for harm in terms of a human injury or ill health,
damage to property, damage to the workplace environment, or any combination of these.
Risk
It is the chance or probability that a person will be harmed or experience an adverse health
effect if exposed to a hazard. May also apply to situations with property or equipment loss.
What is the purpose of a hazard/risk assessment?
to identify hazards and risks in the workplace so that workers are made aware of unsafe
conditions at a worksite.
Occupational Illness
A health problem caused by exposure to health hazards in workplace
Occupational injury
Injury that results from a work-related accident or exposure involving a single incident in the
work environment.
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Hazard-Contributing Factors:
People
Equipment
Materials
Environment
Process
Kinds of Hazards:
Machine
Energy
Confined Space
Material Handling
Work practice/Ergonomic
Chemical/Biological
Aim of hazard/risk assessment process is to
remove a hazard or reduce the level of risk by adding precautions or control measures as
necessary.
Levels of Risk involved with Hazard
Very Low
Low Medium
Medium
High
Very High
Hazard Level: Very Low
Considered acceptable
Hazard Level: Low
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No controls required unless can be implemented at low cost
Hazard Level: Medium
Consideration should be whether the risks can be lowered, where applicable, to a tolerable
level and preferably to an acceptable level, but the cost of additional risk reduction measures
should be taken into account
Hazard Level: High
Substantial efforts should be made to reduce the risk. Risk reduction measures should be
implemented urgently within a defined period of time and it might be necessary to consider
suspending or restricting the activity, or to apply interim risk control measures, until this has
been completed. Arrangements should be made to ensure that controls are maintained,
particularly if the risk levels are associated with extremely harmful consequences
Industrial Hygiene
Science and art devoted to the anticipation, recognition, evaluation, prevention, and control of
those environmental factors or stresses arising in or from the workplace which may cause
sickness,, impaired health and well being, or significant discomfort among workers or among
citizens of the community.
Occupational Health and Safety
Same definition as "industrial hygiene" ;
Science and art devoted to the anticipation, recognition, evaluation, prevention, and control of
those environmental factors or stresses arising in or from the workplace which may cause
sickness,, impaired health and well being, or significant discomfort among workers or among
citizens of the community.
Hazard Level: Very High
These risks are considered unacceptable. Substantial improvements in risk control measures
are necessary so that the risk is reduced to a tolerable and acceptable level. The work activity
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should be halted until risk controls are implemented that reduces the risk so that it is no longer
very high. If it is not possible to reduce the risk, the work should remain prohibited.
Hierarchy of Controls
Elimination/Substitution
Engineering Controls
Administrative Controls
Work Practice
PPE
Engineering Control
something that is a physical altercation that is built or implemented around the hazard
minimizing the hazard making it safer. Placed at the source of the hazard.
accident vs incident
Accident - leaves someone hurt/dead or something is destroyed/damaged as a result of a
occurrence
Incident - The same occurrence but no one is hurt and nothing is damaged or destroyed. (near
misses, close calls)
Accident
is an unexpected event that results in injury to persons, property damage or loss
Incident (near miss)
is an unexpected event that did not cause personal injury this time but had a potential of
causing injury to persons or property damage
3 distinct phases of an accident/incident
Initiatory phase - all events that lead up to the accident/incident. Can be a lengthy period of
time of a short period of time
4
IICRC HST Exam ACTUAL EXAM ALL 150 QUESTIONS
AND CORRECT ANSWERS LATEST UPDATE THIS
YEAR
IICRC HST Exam Study Guide
Principles of health and safety hazard identification rely on these 3 basic criteria
Recognition - of a hazard or potential hazard
Assessment - and eval of the hazard
Controls - that are implemented to minimize hazard
Hazard
Any source or situation with a potential for harm in terms of a human injury or ill health,
damage to property, damage to the workplace environment, or any combination of these.
Risk
It is the chance or probability that a person will be harmed or experience an adverse health
effect if exposed to a hazard. May also apply to situations with property or equipment loss.
What is the purpose of a hazard/risk assessment?
to identify hazards and risks in the workplace so that workers are made aware of unsafe
conditions at a worksite.
Occupational Illness
A health problem caused by exposure to health hazards in workplace
Occupational injury
Injury that results from a work-related accident or exposure involving a single incident in the
work environment.
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, Page 2 of 32
Hazard-Contributing Factors:
People
Equipment
Materials
Environment
Process
Kinds of Hazards:
Machine
Energy
Confined Space
Material Handling
Work practice/Ergonomic
Chemical/Biological
Aim of hazard/risk assessment process is to
remove a hazard or reduce the level of risk by adding precautions or control measures as
necessary.
Levels of Risk involved with Hazard
Very Low
Low Medium
Medium
High
Very High
Hazard Level: Very Low
Considered acceptable
Hazard Level: Low
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No controls required unless can be implemented at low cost
Hazard Level: Medium
Consideration should be whether the risks can be lowered, where applicable, to a tolerable
level and preferably to an acceptable level, but the cost of additional risk reduction measures
should be taken into account
Hazard Level: High
Substantial efforts should be made to reduce the risk. Risk reduction measures should be
implemented urgently within a defined period of time and it might be necessary to consider
suspending or restricting the activity, or to apply interim risk control measures, until this has
been completed. Arrangements should be made to ensure that controls are maintained,
particularly if the risk levels are associated with extremely harmful consequences
Industrial Hygiene
Science and art devoted to the anticipation, recognition, evaluation, prevention, and control of
those environmental factors or stresses arising in or from the workplace which may cause
sickness,, impaired health and well being, or significant discomfort among workers or among
citizens of the community.
Occupational Health and Safety
Same definition as "industrial hygiene" ;
Science and art devoted to the anticipation, recognition, evaluation, prevention, and control of
those environmental factors or stresses arising in or from the workplace which may cause
sickness,, impaired health and well being, or significant discomfort among workers or among
citizens of the community.
Hazard Level: Very High
These risks are considered unacceptable. Substantial improvements in risk control measures
are necessary so that the risk is reduced to a tolerable and acceptable level. The work activity
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should be halted until risk controls are implemented that reduces the risk so that it is no longer
very high. If it is not possible to reduce the risk, the work should remain prohibited.
Hierarchy of Controls
Elimination/Substitution
Engineering Controls
Administrative Controls
Work Practice
PPE
Engineering Control
something that is a physical altercation that is built or implemented around the hazard
minimizing the hazard making it safer. Placed at the source of the hazard.
accident vs incident
Accident - leaves someone hurt/dead or something is destroyed/damaged as a result of a
occurrence
Incident - The same occurrence but no one is hurt and nothing is damaged or destroyed. (near
misses, close calls)
Accident
is an unexpected event that results in injury to persons, property damage or loss
Incident (near miss)
is an unexpected event that did not cause personal injury this time but had a potential of
causing injury to persons or property damage
3 distinct phases of an accident/incident
Initiatory phase - all events that lead up to the accident/incident. Can be a lengthy period of
time of a short period of time
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