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6. Stability can be increased by...

  • having a center of mass as low as possible and having a wide base
  • having the center of mass as big as possible and having a wide base
  • having a center of mass as high as possible and having a wide base
  • having a center of mass as big as possible and having a thin base

7. The ciliary muscles...

  • help focus the light onto the retina
  • Change the thickness of the lens, which are attached via the suspensory ligament
  • are a layer of light sensitive cells
  • are a colored ring of muscles in your eye
  • they attach to the suspensory ligament, which changes the thickness of the lens

8. A relay is used to...

  • switch on/off electrical appliances
  • as a safety mechanism in electrical appliances
  • create electromagnetic induction
  • not enough information is given

9. When an object moves in a circular motion, you can increase the speed by...

  • increase the radius and increase the mass
  • increasing the mass and decreasing the radius
  • increasing the radius and decreasing the mass
  • decrease the radius and decrease the mass

10. What is the frequency of an x-ray? (^ means 'to the power of')

  • 3x10^9 to 3x10^16
  • 0.01 - 10 nanometres
  • 3x10^16 to 3x10^19
  • 10-100 nanometres