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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