Practice Test Geeks(WHMIS) Workplace Hazardous Materials Information System Practice Test
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Hazard Classes and Symbols Flashcards

7 cards from real WHMIS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. WHMIS 2015 replaced WHMIS 1988 by aligning with which international system?

    Answer: UN Globally Harmonized System (GHS) of Classification and Labelling of Chemicals

    WHMIS 2015 integrated the United Nations' Globally Harmonized System (GHS) to standardize hazard classification and communication globally.

  2. In WHMIS 2015, which hazard class replaced the old WHMIS 1988 'biohazardous infectious material' class?

    Answer: It was retained as a WHMIS-specific (non-GHS) class with the same name

    Biohazardous infectious materials is a Canada-specific hazard class kept in WHMIS 2015 because GHS does not cover biological hazards; it retains its own biohazard symbol.

  3. A workplace receives a drum labelled with only a 'flame' pictogram and no other hazard symbols. What does this most likely indicate?

    Answer: The product poses a flammable physical hazard with no other classified hazards

    A single flame pictogram indicates the product has only a flammable physical hazard (e.g., a Category 3 flammable liquid) and no other classified hazards requiring additional pictograms.

  4. Under WHMIS 2015, 'STOT' stands for what?

    Answer: Specific Target Organ Toxicity

    STOT — Specific Target Organ Toxicity — refers to substances that cause damage to specific organs (liver, kidney, nervous system, etc.) either after a single or repeated exposure.

  5. Which WHMIS 2015 class covers products that release heat slowly through reaction with oxygen and may ignite after hours or days?

    Answer: Self-heating substances and mixtures

    Self-heating substances accumulate heat through oxidation slowly over time and can ignite spontaneously after prolonged exposure, unlike pyrophorics which ignite within minutes.

  6. A chemical is classified as a reproductive toxin under WHMIS 2015. Which pictogram will appear on its label?

    Answer: Health hazard (person with starburst on chest)

    Reproductive toxins carry the health hazard pictogram because they cause serious long-term effects (harm to fertility or the developing fetus) rather than acute toxicity.

  7. Which of the following is a WHMIS-Canada-specific hazard class NOT found in the base GHS?

    Answer: Combustible dusts

    Combustible dusts is a hazard class added specifically by Canada to WHMIS 2015 because GHS does not include a separate category for dust explosion hazards.