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6. Centripetal force depends on:

  • Radius
  • Mass
  • All of the above
  • Speed

7. The force that keeps centripetal force on planets in orbit is:

  • Stars
  • Centrifugal force
  • Gravity
  • Pull of sun

8. Geostationary satellites are used for research.

  • False
  • True

9. Low Polar Satellites are used for:

  • Weather and spying.
  • Weather and communications.
  • Spying and communications
  • Research and spying.

10. A virtual image comes from diverging rays which makes the light appear like its come from a different place.

  • True
  • False

11. Angle of Incidence = angle of ?

  • Reflection
  • Refraction

12. Refraction of light is when rays change direction as they enter a new medium.

  • True
  • False

13. Light is refracted when it enters and leaves glass prisms.

  • True
  • False

14. Magnifying glasses use:

  • Concave mirror
  • Convex lens
  • Concave lens
  • Convex mirror
  • Plane mirror

15. A image formed on photographic film is:

  • Real
  • Virtual

16. The image is inverted, same as on the retina of our eyes.

  • True
  • False

17. Sound is made by:

  • Silent light rays
  • Vibrations
  • Noise

18. Humans hear in the range:

  • 20-2000Hz
  • 20-20 000Hz
  • 20-200 Hz

19. Sound travels in a vacuum.

  • False
  • True

20. Ultrasound is...

  • silent waves
  • to high pitched for humans
  • too long waves