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.

Read the first 7 Hazard Classes and Symbols flashcards as text

  1. Which WHMIS 2015 class covers thermally unstable substances that can undergo exothermic decomposition without an oxidizer?

    Answer: Self-reactive substances

    Self-reactive substances are thermally unstable and can decompose exothermically even without oxygen, unlike explosives which require initiation.

  2. In WHMIS 2015, what distinguishes a Category 1 hazard from a Category 2 hazard within the same class?

    Answer: Category 1 is more hazardous (most severe); Category 2 is less hazardous

    In WHMIS 2015 (GHS), lower category numbers indicate greater hazard severity; Category 1 is always the most severe within a class.

  3. Which combination of pictograms would appear on a strong acid like concentrated sulfuric acid?

    Answer: Corrosion + exclamation mark (or skull and crossbones depending on concentration)

    Concentrated sulfuric acid carries the corrosion pictogram for skin/metal corrosion and may carry skull and crossbones or exclamation mark based on acute toxicity category.

  4. Which WHMIS 2015 health hazard class specifically applies to substances that damage lung tissue if accidentally swallowed and aspirated?

    Answer: Aspiration hazard

    Aspiration hazard covers liquids (like hydrocarbons) that can enter the lungs during ingestion or vomiting, causing severe pulmonary damage or death.

  5. The 'environment' pictogram (dead fish and tree) in WHMIS 2015 is used for substances with what property?

    Answer: Acute or chronic aquatic toxicity

    The environment pictogram indicates aquatic toxicity — substances acutely or chronically hazardous to aquatic organisms such as fish, algae, and invertebrates.

  6. Under WHMIS 2015, germ cell mutagenicity refers to substances that can cause what type of harm?

    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.

  7. Which statement about WHMIS 2015 physical hazard classes is correct regarding 'flammable aerosols'?

    Answer: They are classified as flammable if either the propellant or any component is flammable

    An aerosol is classified as flammable if any component — propellant, solvent, or active ingredient — is flammable, not just the propellant gas.