Science 6 · Unit 2: Materials: properties and changes · Cambridge Primary Science Stage 6

Questions

1. 1. What is a thermal conductor?

   • a material that lets heat pass through it well
   • a material that makes heat
   • a person who drives a train
   • a material that stops heat
   Check

2. 2. Why does a metal spoon in hot tea feel hotter than a plastic spoon?

   • Metal makes its own heat.
   • Plastic is a better conductor.
   • The plastic spoon is bigger.
   • Metal is a better conductor of heat.
   Check

3. 3. Which is the best conductor of heat?

   • plastic
   • silver
   • glass
   • wood
   Check

4. 4. Why are pots and pans made of metal?

   • Metal is transparent.
   • Metal is a good insulator.
   • Metal conducts heat to the food well.
   • Metal is soft.
   Check

5. 5. Why are the handles of pans made of plastic?

   • Plastic is heavy.
   • Plastic is magnetic.
   • Plastic conducts heat well.
   • Plastic is a poor conductor, so the handle stays cool.
   Check

6. 6. In which cup will tea stay warm longest?

   • a thin metal cup
   • a copper mug
   • a polystyrene foam cup
   • a glass cup
   Check

7. 7. What do we call materials that are not good conductors?

   • metals
   • magnets
   • insulators
   • conductors
   Check

8. 8. Beads stuck with petroleum jelly to rods in hot water fall off as the rods heat up. Which bead falls first?

   • the one on the polystyrene
   • the one on the metal spoon
   • the one on the pencil
   • the one on the plastic spoon
   Check

9. 9. Which substance conducts electricity?

   • pencil graphite
   • plastic
   • dry wood
   • sugar
   Check

10. 10. Why are electrical plugs made of plastic?

    • Plastic is magnetic.
    • Plastic is transparent.
    • Plastic does not conduct electricity, so it protects us.
    • Plastic conducts electricity well.
    Check

11. 11. Why is a wooden spoon good for stirring hot soup?

    • Wood is magnetic.
    • Wood conducts heat well.
    • Wood melts in soup.
    • Wood is a poor conductor of heat.
    Check

12. 12. Copper conducts heat 400, iron 80, stainless steel 15. Why do some pots have copper bottoms?

    • Copper is a poor conductor.
    • Copper is magnetic.
    • Copper is cheap and weak.
    • Copper conducts heat very well.
    Check

13. 13. Why are cooking pots not usually made of silver?

    • Silver is very expensive.
    • Silver doesn't conduct heat.
    • Silver melts at 50 °C.
    • Silver is a plastic.
    Check

14. 14. Will ice melt quicker in a metal dish or a plastic dish?

    • a metal dish
    • a plastic dish
    Check

15. 15. Class 6 tested graphite lengths: 2 cm brightness 5, 6 cm 4, 10 cm 1, 12 cm 0. What is the pattern?

    • The longer the graphite, the dimmer the lamp.
    • The longer the graphite, the brighter the lamp.
    • Length makes no difference.
    • The lamp is always off.
    Check

16. 16. In that test, what was the independent variable?

    • the length of graphite
    • the type of wire
    • the brightness of the lamp
    • the number of cells
    Check

17. 17. Which parts of a lamp conduct electricity?

    • the glass bulb
    • the metal filament and wires
    • the plastic case only
    • the air inside
    Check