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PHYSICS EXAMINATIONS – 2006PowerPoint Presentation

PHYSICS EXAMINATIONS – 2006

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PHYSICS EXAMINATIONS – 2006

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PHYSICS EXAMINATIONS – 2006

Bruce Walsh

- Calculators
- Study design and textbooks
- Examiners report
- VASS system
- SSMS

JUNE EXAMINATION

- 6712 students
- Mean = 90 = 50%
- Std dev = 38.7 = 21.5%
- Number achieving 100% = 0

- Reasonably challenging paper
- Detailed studies
- Attempt ONE detailed study only
- Explanations address specific question. – Diagrams
- Show working

- Converting units
- Calculations – powers of 10
- raising to power eg. R3

- Care reading scale on axes
- Multiple choice questions
- Illegible writing

- Q3. Two stage – get acc from F=ma then use const acc formula. Many assumed a=9.8. Few used W=ΔEK
- Q6. Net force. Many neglected gravity. Others added it instead of subtracting
- Q7. Multiple steps. Net force const. Use F=ma for acc then const acc for dist. OR I=Δp for speed then const acc for dist. Many assumed acc was g

- Q8. Two components then Pythagoras. Multiple steps
- Q11. I=Δp or get acc then f=ma Easier to treat space station than shuttle (3rd law). Confusion over masses and speeds
- Q12. Conservation of energy. Some fudging

- Q14. Conservation of energy. Loss of Grav PE = Gain in Spring PE. Many used F=-kx assuming f=mg at bottom

- Q1. DC biasing. Parts 2 and 3 poorly done
- Q3. Signal voltage - clipping
- Q4. Decoupling capacitor. Most knew what it did but not why
- Q8. Modulation

- Q7-9. Confusion over frames of reference.

- Q3. Reading axis ε=2% not 2
- Q4. Calculated wrong material or misread strain axis
- Q6. Work = Area of graph x Volume Many forgot volume or had calculation difficulties

- Q7. Operation of regulator

NOVEMBER EXAMINATION

- 6589 students
- Mean = 111 = 62%
- Std dev = 41 = 23%
- Number achieving 100% = 20

- Accessible paper
- Detailed studies
- Illegible writing
- Explanations must address specific question

- Explanations – one mark per point
- Show working
- Unit conversions, eg. cm2 to m2
- Read questions carefully. Answer what is asked not what you expect to be asked.

Q1. Sketching magnetic fields.

Q8. E.M. induction. Trouble calculating area (units) and getting correct time

Q14-15. Operation of transformer

Q16. Overall distribution system

- Q1. Incoherent light from wide spectrum sources. Confused with discrete emission spectrum.
- Q2. Wave and particle predictions for PE effect.
- Q6. Meaning of standing waves for electrons in stable states in atoms.

- Q11. Distinction between matter and electromagnetic radiation. Wrong Planck’s constant. Assumption that because momentum was the same, energy was also. Electron speed taken as 3x108.

- Q2. Explain two advantages.
- Q5. Relate greater wavelength to reduced energy.

- Q5. Operation of graded index multimodal fibres
- Q6-7. Snell’s law
- Q10. Rayleigh scattering increases as wavelength decreases.

- Q6. Sound from front and rear out of phase, box prevents interference.
- Q9. Unable to explain resonance in terms of behaviour of sound waves.