WHMIS Certification Exam — Questions and Answers

Question 1: A worker must handle a reproductive toxin. Which WHMIS document would contain information about its reproductive hazards?

Supplier label's signal word
Safety Data Sheet, Section 11: Toxicological Information (Correct answer)
Workplace label created by the supervisor
Safety Data Sheet, Section 2: Hazard Identification

Correct answer: Safety Data Sheet, Section 11: Toxicological Information

SDS Section 11 (Toxicological Information) provides detailed health effects data including reproductive toxicity.

Question 2: A product labelled with both the 'exploding bomb' and 'flame' pictograms most likely belongs to which class?

Corrosive and flammable solid
Compressed gas and flammable liquid
Oxidizer and pyrophoric solid
Organic peroxides (which can be both explosive and flammable) (Correct answer)

Correct answer: Organic peroxides (which can be both explosive and flammable)

Organic peroxides can exhibit both explosive decomposition and flammability, so they may carry both the exploding bomb and flame pictograms.

Question 3: An employer receives a product with a supplier label that includes a pictogram not found in WHMIS 2015's nine standardized GHS pictograms. What should the employer do?

Ignore the extra pictogram as it has no WHMIS significance
Investigate the additional pictogram's meaning and ensure workers are informed of any additional hazards (Correct answer)
Report the supplier to OSHA for using unauthorized pictograms
Remove the non-standard pictogram from the label before workers see it

Correct answer: Investigate the additional pictogram's meaning and ensure workers are informed of any additional hazards

Non-standard pictograms may indicate hazards under other regulatory systems (such as transportation); employers should investigate their meaning and ensure workers understand all hazard information.

Question 4: Which WHMIS hazard class exists in Canadian law but has no equivalent category in the international GHS system?

Flammable liquids
Corrosive to metals
Biohazardous infectious materials (Correct answer)
Oxidizing gases

Correct answer: Biohazardous infectious materials

Biohazardous infectious materials is a WHMIS-specific hazard class added to address biological hazards in Canadian workplaces, with no GHS counterpart.

Question 5: What does WHMIS stand for?

Workplace Hazardous Maintenance Information System
Workplace Health Materials Information System
Workplace Hazardous Materials Information System (Correct answer)
Workplace Healthy Materials Information System

Correct answer: Workplace Hazardous Materials Information System

Explanation: <br> WHMIS stands for Workplace Hazardous Materials Information System. This system is designed to provide information about hazardous materials in the workplace, including their potential health effects, safe handling procedures, and necessary precautions. It is important for employees to be aware of and understand WHMIS in order to work safely with hazardous materials and protect their health.

Question 6: Which of the following is an example of a WHMIS training record an employer should maintain?

Documentation of who was trained, when, what was covered, and the training evaluation results (Correct answer)
The chemical inventory list alone
A copy of the federal WHMIS regulation
The original SDS issued by the supplier

Correct answer: Documentation of who was trained, when, what was covered, and the training evaluation results

Employers should keep records that show which workers were trained, the date and content of training, and evidence of competency evaluation to demonstrate compliance.

Question 7: A Material Safety Data Sheet expires after how many years?

4 years
3 years (Correct answer)
1 year
It never expires
2 years

Correct answer: 3 years

Explanation: <br> A Material Safety Data Sheet (MSDS), now more commonly known as a Safety Data Sheet (SDS) under the globally harmonized system, does not have an expiration date. However, it is important for employers to ensure that the SDS is kept up to date. Manufacturers or suppliers should update the SDS whenever new information becomes available about the chemical's hazards or safety information changes. Employers should check regularly for updates to ensure that the most current information is available in the workplace for the safety of all employees.

Question 8: Organic peroxides of Type B under WHMIS may require which combination of pictograms?

Skull and crossbones and health hazard
Gas cylinder and corrosion
Biohazard and exclamation mark
Both exploding bomb and flame (Correct answer)

Correct answer: Both exploding bomb and flame

Type B organic peroxides pose both explosive and flammable risks, so they carry both the exploding bomb and flame pictograms.

Question 9: A worker claims prior experience means they already understand a hazardous product fully. What must the employer do under WHMIS?

Verify the worker's actual competency before allowing unsupervised work with the product (Correct answer)
Accept the worker's self-assessment and document it without further action
Provide full formal training as though the worker has no prior knowledge
Exempt the worker from all WHMIS training requirements based on their claim

Correct answer: Verify the worker's actual competency before allowing unsupervised work with the product

Employers must confirm that a worker genuinely understands hazards and safe procedures — prior experience can be credited, but competency must be verified.

Question 10: Under WHMIS, how long must an employer retain an SDS after a hazardous product is no longer in use at the workplace?

30 days
30 years (Correct answer)
1 year
5 years

Correct answer: 30 years

Employers must retain SDSs for hazardous products for 30 years after the product is no longer used, to protect workers who may develop delayed health conditions.

Question 11: An employer operates in a province with its own occupational health and safety legislation. How does provincial OHS law interact with federal WHMIS requirements for training?

Provincial laws are optional once federal WHMIS compliance is achieved
Provinces cannot regulate WHMIS training at all
Federal WHMIS requirements override all provincial OHS rules entirely
Provincial OHS legislation establishes the training and education obligations that employers must fulfill, building on the federal product information framework (Correct answer)

Correct answer: Provincial OHS legislation establishes the training and education obligations that employers must fulfill, building on the federal product information framework

The federal HPA/HPR govern suppliers' product information duties, while each province/territory's OHS legislation sets the employer's and worker's obligations for training and education.

Question 12: A worker refuses to handle a hazardous chemical because they believe they have not received adequate WHMIS training. What legal protection may apply to this worker?

Protection only if a union represents them
The right to refuse unsafe work under provincial/territorial OHS legislation (Correct answer)
No protection — workers must follow all employer instructions unconditionally
Protection only if the chemical is on a specific government list

Correct answer: The right to refuse unsafe work under provincial/territorial OHS legislation

Workers have the right to refuse work they reasonably believe is unsafe, including situations where they have not received adequate training on hazardous products.

Question 13: Under WHMIS, which statement best describes the shared responsibility model?

Workers are solely responsible for understanding hazards in their own workspace
Suppliers, employers, and workers each have distinct but complementary WHMIS responsibilities (Correct answer)
The government handles all WHMIS compliance, relieving employers of direct duties
Only employers bear all WHMIS duties; workers have no obligations

Correct answer: Suppliers, employers, and workers each have distinct but complementary WHMIS responsibilities

WHMIS is built on a shared responsibility model where suppliers label and provide SDSs, employers train workers and manage the program, and workers participate and apply safe practices.

Question 14: If the contents of a labeled container are replaced with a different hazardous product, what must occur?

The existing label may remain if both products are in the same hazard class
Only the product identifier needs to be updated on the existing label
No change is needed if an SDS for the new product is posted nearby
The old label must be removed or covered and a new label for the new product applied (Correct answer)

Correct answer: The old label must be removed or covered and a new label for the new product applied

When container contents change, the previous label must be completely removed or rendered unreadable, and a new label accurately reflecting the new product must be applied.

Question 15: Which scenario correctly illustrates a supplier's WHMIS responsibility regarding confidential business information (CBI)?

CBI exemptions allow suppliers to skip the SDS entirely
Workers have no right to CBI ingredient information under any circumstances
Suppliers may apply for a CBI exemption but must still disclose hazard information and the ingredient's chemical properties to health professionals in emergencies (Correct answer)
Suppliers may omit all chemical ingredients if they claim trade secret status

Correct answer: Suppliers may apply for a CBI exemption but must still disclose hazard information and the ingredient's chemical properties to health professionals in emergencies

Suppliers may protect specific ingredient identities as trade secrets through a CBI exemption, but must still provide full hazard information and must disclose the ingredient to health professionals treating exposed workers.

Question 16: How are workplace labels fundamentally different from supplier labels in terms of required content?

Workplace labels require pictograms while supplier labels do not
Both types require identical information and format
Workplace labels require more detailed information than supplier labels
Workplace labels require fewer elements and reference the SDS rather than repeating full hazard details (Correct answer)

Correct answer: Workplace labels require fewer elements and reference the SDS rather than repeating full hazard details

Workplace labels are simplified to three elements (product identifier, safe handling information, SDS reference) rather than the six required on supplier labels.

Question 17: Self-reactive substances of Type A under WHMIS require which pictogram?

Exploding bomb only (Correct answer)
Flame only
Both exploding bomb and flame
Corrosion and health hazard

Correct answer: Exploding bomb only

Type A self-reactive substances are extremely reactive and display the exploding bomb pictogram due to their explosive potential.

Question 18: SDS Section 14 covers transport information. Why would a worker need to consult this section?

To determine proper shipping classifications and labels for moving the product (Correct answer)
To understand how to dispose of the product
To find the correct PPE before using the product
To identify exposure limits for daily work

Correct answer: To determine proper shipping classifications and labels for moving the product

Section 14 provides transport classification details (UN number, shipping name, hazard class) needed when shipping or receiving hazardous products.

Question 19: Under WHMIS, employers must provide workers with training on hazardous products. How often must this training be updated?

Once at the time of hire, with no further requirement
Only when a worker is injured by a hazardous product
Whenever a new hazardous product is introduced, or when workplace conditions change that affect the hazard (Correct answer)
Every five years regardless of workplace changes

Correct answer: Whenever a new hazardous product is introduced, or when workplace conditions change that affect the hazard

WHMIS training must be updated when new hazardous products are introduced or when conditions change that could affect worker safety.

Question 20: Under WHMIS 2015, germ cell mutagenicity refers to substances that can cause what type of harm?

Allergic skin reactions
Immediate toxic effects to skin cells
Damage to liver and kidney cells
Heritable genetic mutations in reproductive cells (Correct answer)

Correct answer: Heritable genetic mutations in reproductive cells

Germ cell mutagens cause DNA changes in sperm or egg cells that can be passed to future generations, which is why they fall under the health hazard category.

WHMIS Certification Exam

This certification ensures individuals understand the Workplace Hazardous Materials Information System, including hazard identification, labeling, safety data sheets, and safe handling of hazardous products in Canadian workplaces.

Questions

30 min

Time Limit

80%

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These practice questions were written with AI tools. They are not real exam questions. We have not yet matched this exam's facts to an official source, so confirm fees, dates and rules with the exam body. Not reviewed by a subject-matter expert. Editorial policy