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6. An iron core is used in transformes so it can become magnitised

  • True
  • False

7. Why is insulated wire used to make the coils?

  • So it is safer
  • To make sure everything stays connected
  • To prevent a short circuit
  • So it doesnt harm people

8. More powerful magnets increase the potential difference

  • True
  • False

9. What does Centre of Mass mean?

  • The centre of mass is the point where the object will fall
  • The centre of mass is the point at which the total mass appears to be concentrated
  • The centre of mass is the point where the object will be stable

10. What is meant by the period of a plant?

  • The time taken between each rainfall
  • The time for a planet to go around the sun
  • The time taken to make one orbit
  • The time taken for the moon to go around the earth

11. Acceleration changes the speed but not the direction

  • False
  • True

12. Explain how helium was formed (lighter element)

  • The fusion of heavier elements
  • The fusion of dust particles when they come together to form stars
  • The fusion of hydrogen atoms
  • In a supernova