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6. The Polar Orbits is used for:

  • weather and military
  • weather and communications
  • communications and military
  • research an weather

7. The Geostationary orbit takes 24hrs to orbit the earth?

  • True
  • False

8. The turning effect of a force is called a:

  • moment
  • centre of mass
  • centripetal force
  • centrifugal force

9. the stability of an object depends on:

  • position of the centre of mass
  • the surface area of the base of the object
  • all of the above
  • distribution of mass within the object

10. The bigger the angle between the centre of mass and the line of symmetry controls how big the moment is?

  • True
  • False

11. To improve accuracy:

  • represt and take an average
  • calibrate device and remove zero error
  • use smaller scale on measuring device

12. Magnetism is caused by the movement of:

  • particles
  • electrons
  • atoms
  • protons

13. The rule to show the direction of magnetic force around a current is:

  • none of the above
  • the left-hand motor rule
  • the right-hand corkscrew rule
  • the right hand grip rule

14. A coil of wire used to create a magnetic field is called a solenoid?

  • True
  • False

15. Variables that effect the field strength of a solenoid are:

  • density of coils
  • all of the above
  • thickness of wire
  • number of coils
  • amount of voltage

16. The generator effect induces a current flow in a conductor?

  • True
  • False

17. Another name for a generator is:

  • a dynamo
  • a motor

18. Transformers don't include:

  • electromagnetism
  • wires
  • voltage
  • coils of wire

19. Transformers only work with A.C current?

  • True
  • False

20. A step-up transformer:

  • increases voltage
  • increases current