Practice Test Geeks(WHMIS) Workplace Hazardous Materials Information System Practice Test
← All WHMIS Flashcard Decks

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 pictogram shows a flame above a circle?

    Answer: Oxidizing substances

    The flame over circle pictogram represents oxidizing substances, which can cause or intensify fire by releasing oxygen.

  2. Under WHMIS 2015, 'gases under pressure' includes which sub-categories?

    Answer: Compressed, liquefied, refrigerated liquefied, and dissolved gases

    WHMIS 2015 recognizes four types of gases under pressure: compressed, liquefied, refrigerated liquefied, and dissolved gases.

  3. The skull and crossbones pictogram in WHMIS 2015 indicates which hazard?

    Answer: Acute toxicity (fatal or toxic)

    The skull and crossbones symbol signals acute toxicity — substances that are fatal or toxic in small amounts via ingestion, skin contact, or inhalation.

  4. Which class covers substances that can spontaneously ignite when exposed to air?

    Answer: Pyrophoric liquids and solids

    Pyrophoric liquids and solids ignite spontaneously within 5 minutes of contact with air, unlike self-heating substances that require time.

  5. What does the exclamation mark pictogram in WHMIS 2015 represent?

    Answer: Moderate hazards like skin/eye irritation or specific target organ toxicity (single exposure)

    The exclamation mark indicates less severe but still important hazards such as skin/eye irritation, skin sensitization, or STOT-single exposure category 3.

  6. Which WHMIS 2015 physical hazard class applies to dusts that can explode when suspended in air?

    Answer: Combustible dusts

    Combustible dusts is a WHMIS-specific hazard class for solid materials in fine particle form that can ignite and explode when suspended in air.

  7. Which pictogram is used specifically for biohazardous infectious materials in WHMIS 2015?

    Answer: The universal biohazard symbol (three interlocking circles)

    WHMIS 2015 uses the internationally recognized biohazard symbol — three interlocking arcs forming a trefoil — for biohazardous infectious materials.