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

1. 第1题，共16题

   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
   显示答案

   答案: A. Canada's national hazard communication standard

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

2. 第2题，共16题

   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
   显示答案

   答案: 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. 第3题，共16题

   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
   显示答案

   答案: C. The product is a fire hazard

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

4. 第4题，共16题

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

   • AGas cylinder
   • BFlame over circle
   • CExclamation mark
   • DCorrosion
   显示答案

   答案: D. Corrosion

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

5. 第5题，共16题

   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
   显示答案

   答案: B. Skull and crossbones

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

6. 第6题，共16题

   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"
   显示答案

   答案: 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. 第7题，共16题

   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
   显示答案

   答案: A. The contents are dangerous

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

8. 第8题，共16题

   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
   显示答案

   答案: 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. 第9题，共16题

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

   • ADANGER
   • BWARNING
   • CEXTREME DANGER
   • DCAUTION
   显示答案

   答案: C. EXTREME DANGER

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

10. 第10题，共16题

    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
    显示答案

    答案: 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. 第11题，共16题

    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
    显示答案

    答案: C. A graduated cylinder

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

12. 第12题，共16题

    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
    显示答案

    答案: 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. 第13题，共16题

    Which is the SI base unit for mass?

    • ANewton (N)
    • BGram (g)
    • CPound (lb)
    • DKilogram (kg)
    显示答案

    答案: D. Kilogram (kg)

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

14. 第14题，共16题

    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
    显示答案

    答案: C. 2500 mL

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

15. 第15题，共16题

    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
    显示答案

    答案: A. 0.45 kg

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

16. 第16题，共16题

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

    • A0.35 cm
    • B350 cm
    • C3.5 cm
    • D35 cm
    显示答案

    答案: C. 3.5 cm

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

键盘：按1–4作答，按 Enter 进入下一题。

真实考试：55% on each CAEC test