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6. how long does it take a geostationary satellite to orbit the earth once?

  • 365 days
  • 24 hours
  • 1 hour

7. true or false: the angle of incidence=angle or reflection

  • True
  • False

8. which type of mirror is shiny on the outside?

  • convex
  • concave

9. where is the centre of curvature and focal point in a concave mirror?

  • in front
  • behind

10. what is the formula for magnification?

  • magnification= image height x object height
  • magnification= image height/object height
  • magnification= image height - object height

11. true or false: sound waves can reflect and refract...

  • True
  • False

12. what is the range of sounds that we can hear?

  • 30 Hz - 30000 Hz
  • 20 Hz - 20000 Hz
  • 10 Hz- 10000 Hz

13. what happens to the loudness of a noise when the amplitude increases?

  • it increases
  • it decreases
  • it stays the same

14. true or false: the higher the frequency, the lower the pitch?

  • False
  • True

15. what do we call sound that has a higher frequency than we can hear?

  • oscillating waves
  • ultrasound
  • vibrations
  • silence

16. where is ultra sound used?

  • all of the above
  • baby scans
  • cleaning
  • quality control

17. which is the correct definition for a magnetic field?

  • a magnetic field is the area around a magnet
  • a magnetic field is the area around a magnetic material and experience a force acting on it
  • a magnetic field is a region where magnetic materials are attracted to one another

18. what is a solenoid?

  • a coil of wire
  • a type of battery
  • a device which makes objects magnetic

19. what name is given to a solenoid with a magnetically 'soft' iron core in the middle?

  • an electromagnet
  • a magnet
  • a battery

20. which of the following factor speeds up an electric motor?

  • more turns on the coil
  • a soft iron core in the coil
  • all of the above
  • a stronger magnetic field
  • higher current