CAEC Science Preparation Course: Inquiry: safety, tools and SI units

1. Pergunta 1 de 16

   What is WHMIS?

   • ACanada's national hazard communication standard
   • BThe test you must pass to earn the Canadian Adult Education Credential
   • CA brand of safety glasses and gloves sold to laboratories and schools
   • DThe system of metric units that scientists use in Canada and abroad
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   Resposta: A. Canada's national hazard communication standard

   WHMIS is the Workplace Hazardous Materials Information System, Canada's national standard for sharing hazard information.

2. Pergunta 2 de 16

   What does the border of a WHMIS pictogram usually look like?

   • AA green octagon shaped like a stop sign
   • BA blue triangle pointing downward
   • CA yellow circle with a thick black outline
   • DA red square set on one point
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   Resposta: D. A red square set on one point

   WHMIS pictograms use a red square set on one of its points, which looks like a diamond.

3. Pergunta 3 de 16

   A WHMIS label shows a flame pictogram. What does it warn about?

   • AThe product is hot to touch right now and may burn your hand
   • BThe product contains germs that can cause a serious infection
   • CThe product is a fire hazard
   • DThe product is safe to heat on a stove or over an open flame
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   Resposta: C. The product is a fire hazard

   The flame pictogram is used for fire hazards such as flammable gases, aerosols, liquids and solids.

4. Pergunta 4 de 16

   Which WHMIS pictogram warns that a product can burn skin, damage eyes or eat through metal?

   • AGas cylinder
   • BFlame over circle
   • CExclamation mark
   • DCorrosion
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   Resposta: D. Corrosion

   The corrosion pictogram covers products corrosive to metals and products that cause skin corrosion or serious eye damage.

5. Pergunta 5 de 16

   Which WHMIS pictogram is used for products that can cause death or serious poisoning after a short exposure?

   • AExclamation mark
   • BSkull and crossbones
   • CFlame over circle
   • DGas cylinder
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   Resposta: B. Skull and crossbones

   Skull and crossbones shows acute toxicity: the product can poison you after being swallowed, touched or breathed in.

6. Pergunta 6 de 16

   Two WHMIS labels show different signal words: "Danger" and "Warning." What is the difference?

   • AThey mean exactly the same thing
   • B"Danger" is only for products sold to the public
   • C"Danger" is used for more severe hazards than "Warning"
   • D"Warning" is used for more severe hazards than "Danger"
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   Resposta: C. "Danger" is used for more severe hazards than "Warning"

   On WHMIS labels, "Danger" signals high-risk hazards and "Warning" signals less severe ones.

7. Pergunta 7 de 16

   A household cleaner has a hazard symbol inside an octagon (stop-sign shape). What does the octagon frame tell you?

   • AThe contents are dangerous
   • BThe product has been tested and is safe for young children
   • CThe product may be used only in workplaces, not in homes
   • DOnly the container itself is dangerous, not what is inside
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   Resposta: A. The contents are dangerous

   On consumer products, an octagon frame means the contents are dangerous. A triangle means the container is dangerous.

8. Pergunta 8 de 16

   A can of spray paint shows an exploding-container symbol inside a triangle. What does it mean?

   • AThe paint will glow in the dark after it dries
   • BThe paint will explode as soon as it touches your skin
   • CThe paint is poisonous if a person swallows it
   • DThe can may explode if heated or punctured
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   Resposta: D. The can may explode if heated or punctured

   The explosive symbol on consumer products means the container can explode if heated or punctured; the triangle shows the container is the danger.

9. Pergunta 9 de 16

   On consumer chemical products, which signal word shows the HIGHEST degree of risk?

   • ADANGER
   • BWARNING
   • CEXTREME DANGER
   • DCAUTION
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   Resposta: C. EXTREME DANGER

   The order from highest to lowest risk is EXTREME DANGER, DANGER, then CAUTION.

10. Pergunta 10 de 16

    What is the safest way to store a bottle of drain cleaner at home?

    • APoured into a clean drink bottle so that it is easy to pour later
    • BClosed tightly in its original container, out of children's reach
    • COn the kitchen counter beside the sink so that you remember where it is
    • DWith the cap left off so that fumes do not build up inside the bottle
    Mostrar resposta

    Resposta: B. Closed tightly in its original container, out of children's reach

    Health Canada advises keeping products tightly closed in their original containers and out of reach of children and pets.

11. Pergunta 11 de 16

    Which tool should you use to measure 75 mL of water as accurately as possible?

    • AA ruler marked in millimetres
    • BA thermometer marked in degrees Celsius
    • CA graduated cylinder
    • DA protractor marked in degrees
    Mostrar resposta

    Resposta: C. A graduated cylinder

    A graduated cylinder has marked lines for measuring liquid volume in millilitres.

12. Pergunta 12 de 16

    How should you read the volume of water in a graduated cylinder?

    • AFrom above, looking down at the top edge of the water
    • BAt the highest point where the water touches the glass wall
    • CAt eye level, at the bottom of the curved surface
    • DTilted to one side so that you can see the marks better
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    Resposta: C. At eye level, at the bottom of the curved surface

    Water curves down in the middle. Read the bottom of this curve at eye level for an accurate measurement.

13. Pergunta 13 de 16

    Which is the SI base unit for mass?

    • ANewton (N)
    • BGram (g)
    • CPound (lb)
    • DKilogram (kg)
    Mostrar resposta

    Resposta: D. Kilogram (kg)

    The seven SI base units include the kilogram for mass, the metre for length and the second for time.

14. Pergunta 14 de 16

    A recipe for a lab solution needs 2.5 L of water. How many millilitres is that?

    • A25 mL
    • B25 000 mL
    • C2500 mL
    • D250 mL
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    Resposta: C. 2500 mL

    Milli means one thousandth, so 1 L = 1000 mL. 2.5 × 1000 = 2500 mL.

15. Pergunta 15 de 16

    A sample has a mass of 450 g. What is its mass in kilograms?

    • A0.45 kg
    • B4.5 kg
    • C45 kg
    • D0.045 kg
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    Resposta: A. 0.45 kg

    Kilo means 1000, so divide grams by 1000: 450 ÷ 1000 = 0.45 kg.

16. Pergunta 16 de 16

    A seedling is 35 mm tall. What is its height in centimetres?

    • A0.35 cm
    • B350 cm
    • C3.5 cm
    • D35 cm
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    Resposta: C. 3.5 cm

    1 cm = 10 mm, so divide by 10: 35 ÷ 10 = 3.5 cm.

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