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6. Which diagram is a diverging lens then a converging lens?

  • )( ()
  • () )(

7. X=image height/object height. X is...

  • Reflection
  • Refraction
  • Centripetal force
  • Magnification
  • Acceleration

8. Which wave would have the highest pitch/frequency (sorry, theyre the best i could come up with!)

  • ___________
  • \/\/\/\/\/\/\/\/\/\
  • rrrrrrrrrrrrrrrrrrr
  • WWWWWW

9. What is ultrasound?

  • A machine which produces very loud sound
  • A baby scanner
  • Sound which is higher than we can hear
  • Sound which is lower than we can hear
  • A sound measuring device

10. What range of sound can humans detect?

  • 20-500Hz
  • 20-20000Hz
  • 500-2000Hz
  • 100-20000Hz
  • 0-10000Hz

11. Two uses of ultrasound are...

  • Destroying glass and causing unnessasary destruction
  • Scanning for babies and cleaning equipment
  • Calling dogs and controlling amplifiers
  • making really loud and high pitched noise
  • broadcasting tv and measuring distances

12. What is the moment around this pivot? A 10N force is pushed down 0.3 metres from the pivot

  • 0.3N/m
  • 3N/m
  • 0.3Nm
  • 3Nm
  • 30Nm

13. Along what axis can the centre of mass be found?

  • X, Y and Z
  • Symmetry
  • Refraction
  • X and Y
  • Reflection

14. The centre of mass of a body is that point at which the mass of the body may be thought to be:

  • Minimum
  • Maximum
  • Equal
  • Concentrated
  • Central

15. An object travelling in a circle is always accelerating because it always changes direction so...

  • the object doesnt actually exist
  • there must be a force acting upon it - centripetal
  • there is no force acting on it, therefore we have centripetal force.
  • gravity must be playing a part in making it spin
  • It is always increasing speed

16. Which of these is not true? Centripetal force increases as...

  • radius increases
  • mass increases
  • speed increases
  • radius decreases

17. Which of these is not true?

  • Stable objects topple easily
  • Balanced force = object moves at the same speed or not at all
  • Line of action of weight outside of body = topple
  • clockwise moment = anticlockwise moment = stable
  • Stable = low C.O.M. and wide base

18. What affects gravitational attraction?

  • centripetal force and size
  • distance and size
  • time and distance
  • speed and size
  • distance and speed

19. Smaller mass stars die and become...

  • black holes
  • Black dwarfs
  • red giants

20. How do you calculate the turning effect of a force?

  • circumforce = force x perpendicular distance
  • moment = radius x force
  • moment = force x perpendicular distance
  • circumference = pi x diameter
  • circumforce = force x circumference