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6. A satellite in a geo-stationary orbit around Earth takes how long for one orbit?

  • 75 hours
  • 24 hours
  • 3 hours
  • 30 minutes

7. Why does light refract when it enters glass?

  • It decreases in speed
  • It increases in speed

8. The highest frequency of sound humans can hear is in the range of...

  • 2-20000 Hz
  • 2-20 Hz
  • 20-20000 Hz
  • 20-2000 Hz
  • 20-200 Hz

9. Amplitude affects the loudness of sound

  • True
  • False

10. To increase the potential difference of electromagnetic induction, you should...

  • decrease the speed of movement of the magnet
  • increase the stregth of the magnetic field
  • decrease the number of turns of the coil
  • increase the size of the magnet

11. In the UK, the P.D. of mains elctricity is what?

  • 330V
  • 230V
  • 300V
  • 150V
  • 200V

12. Stars create atoms heavier than hyrogen by the process of what?

  • Nuclear Fusion
  • Nuclear Fission

13. How are atoms heavier than iron formed?

  • Radioactive decay of other elements
  • In the explosion of supernovae
  • In the above process in stars