When choosing a substitute chemical, what must be checked?
JHSC Part One: Hazard control and evaluating controls
Controlling hazards at the source, along the path and at the worker, the hierarchy of controls with examples, qualities of good controls and evaluating them.
- No sign-up
- Every answer explained
- Independent · not a government site
- 14 questions
- Topic drill
Study reference: Ontario JHSC Part One sources (Oct 2026), Ch. 12 Hazard control and evaluating controls — JHSC Certification Training Program Standard, 8.1.9–8.1.10; CCOHS Hierarchy of Controls
All 14 questions in this test
Every question and its answer choices. The correct answers and explanations appear when you take the test above.
When choosing a substitute chemical, what must be checked?
- That it does not create a new or greater hazard
- That it comes in the same colour container
- That it has a stronger smell than before
- That it is the cheapest product on the market
At which three points can a hazard be controlled?
- At the office, at the gate, and in the parking lot
- At the source, along the path, and at the worker
- By the union, by the employer, and by the ministry
- In the morning, at noon, and at the end of the shift
Spraying water on a dusty surface while grinding is which kind of measure?
- Elimination of the dust hazard
- Personal protective equipment
- An engineering (process) control
- An administrative rule only
Which control is the most effective in the hierarchy of controls?
- Personal protective equipment
- Administrative controls
- Elimination
- Substitution
Replacing a solvent-based paint with a water-based paint is which type of control?
- Personal protective equipment
- Administrative control
- Elimination
- Substitution
A job-rotation schedule that limits each worker's time in a noisy area is which type of control?
- Administrative control
- Substitution
- Elimination
- Engineering control at the source
Can more than one type of control be used for the same hazard?
- No, only one control is legal
- Only if the JHSC votes to allow
- Only for chemical hazards
- Yes; controls are often combined
What does hazard control mean?
- Recording hazards in a logbook
- Reducing or eliminating hazards
- Blaming workers for each hazard
- Moving hazards to another shift
Why are administrative controls ranked below engineering controls?
- They can only be used in offices, not in plants or warehouses
- They are always more expensive than any engineering control
- They do not necessarily remove or reduce the hazard itself
- They are not allowed under Ontario's health and safety law
Installing local exhaust ventilation over a welding bench is which type of control?
- Substitution
- Elimination
- Engineering control
- Administrative control
What is the purpose of evaluating hazard controls?
- To check that they work as intended and keep working
- To find someone to blame if a control fails later
- To decide how much to charge workers for their PPE
- To replace every control with PPE as soon as possible
Using a reach pole to wash windows from the ground instead of working on a ladder is an example of what?
- An administrative rule about ladder inspections
- Substitution of one kind of ladder for another
- Personal protective equipment for the window washer
- Elimination of the working-at-heights hazard
Which is listed last, as the least effective control?
- Substitution
- Elimination
- Personal protective equipment
- Engineering controls such as guards
Why is PPE considered the last line of defence?
- It is banned in workplaces that have a working JHSC
- It is too expensive for most employers to buy for workers
- It removes the hazard completely from the whole workplace
- It depends on correct fit and use, and the hazard remains
Hazard control and evaluating controls: key rules to remember
Our summary of what the official handbook says on this topic, in our own words. Read it before or after the practice questions above, then check the original chapter. Read the official chapter ↗
Program standard 8.1.9–8.1.10
- Hazard control means reducing or eliminating hazards.
- Controls can be applied at the source, along the path between source and worker, and at the worker.
- Five types of control, in order of the hierarchy: elimination, substitution, engineering controls, administrative controls and personal protective equipment (PPE).
- Learners must be able to explain the qualities of an effective control; CCOHS stresses that a control must not introduce a new, greater hazard and that engineering controls are reliable only if designed, used and maintained properly.
- Evaluating controls checks whether they work as intended and keep working.
Hierarchy of controls
- Elimination physically removes the hazard and is the most effective (for example buying quieter equipment, using a reach pole to avoid working at heights, removing unused products).
- Substitution replaces a hazard with a less hazardous one (water-based paint instead of solvent-based, pellets instead of fine powder, electric instead of diesel motors); check that the substitute does not create new harm.
- Engineering controls deal with the hazard at the source before it reaches the worker: isolation, enclosures, machine guards, local exhaust ventilation, mechanical lifting devices, guardrails, wet methods for dust.
- Administrative controls change how people work: safe work procedures, training, job rotation or work-rest schedules, scheduling high-exposure work when few people are present, restricting access, preventive maintenance, housekeeping and warning signs. They rank lower because they do not remove the hazard.
- PPE (respirators, gloves, hearing protection) is the last line of defence because it depends on correct fit and use every time.
- More than one control can be combined; controls should be reviewed to confirm they are adequate.
Study the Hazard control and evaluating controls rules as flashcards →
Other topics
- Certification and the internal responsibility systemHow JHSC certification works (Part One, Part Two, refresher, Chief Prevention Officer), what certified members do, and the internal responsibility system behind Ontario's law.
- The OHSA and how the law worksHow the Occupational Health and Safety Act, regulations, standards and guidelines fit together, key sector regulations, enforcement under Part VIII and penalties.
- Duties of the workplace partiesDuties of employers, supervisors, workers, owners, suppliers and corporate directors, the competent person, and the health and safety policy and program.
- Worker rights: know, participate, refuseThe right to know, the right to participate and the right to refuse unsafe work, the two-stage work refusal process, and protection from reprisals.
- When a JHSC is required and how it runsWhich workplaces need a committee or a representative, membership, co-chairs, meetings, minutes, postings, paid time and worker trades committees.
- JHSC powers and recommendationsWhat the committee may do: identify hazards, obtain information, recommend improvements, the employer's 21-day written response, consensus and co-chair recommendations, and inspector visits.
- Certified members and dangerous circumstancesWhat dangerous circumstances are, investigating complaints, bilateral and unilateral work stoppages, cancelling a direction and complaints of reckless use.
- Workplace violence and harassmentLegal definitions, policies, programs, risk assessments, the committee's role, reporting incidents, domestic violence and the Human Rights Code.
- Hazard recognition and categoriesHazard, injury and illness, the six hazard categories, the five contributing factors, states of matter, routes of entry and acute versus chronic effects.
- Workplace inspectionsWho inspects, how often, preparing and doing an inspection, reporting hazards to the committee and other ways to find hazards.
- Hazard assessment and exposure limitsMethods for assessing how serious a hazard is, exposure monitoring, the committee's right to be at the start of testing, and TWA, STEL and ceiling limits.
- Reporting and investigating incidentsNotices of death, critical injury, lost-time injury and occupational illness, the critical injury definition, preserving the scene, and committee investigations.