These answers are presented in the order they are in the sheet. Page and question numbers are as presented in the booklet (from the old exams themselves).
Paper 1 (Multiple Choice Questions)
34 C (It should bend towards the normal, but not down the normal because it will only pass through the normal if it enters along the normal).
35 B, 36 C, 37 C, 38 C, 39 C, 40B
2011 paper: 38 A, 39C, 40 B
Paper 3 Questions
1 (a) (i) hot water rises/cold water sinks/hot water stays on top of cold water ;
ref. to convection (1 mark);
hot water less dense/cold water more dense (the second mark);
ii) 5000J/5kJ ;
4) a) i) electrons ii) negative iii) electrons accumulate on the screen
(it must be stated as electrons, not protons or ions)
iv) any two of:
length,
cross sectional area / diameter / thickness / width,
resistivity / conductivity / material,
temperature ;
c) i) heat (or thermal energy)
ii) its temperature increases (or it rises and causes convection current)
iii) 33%
7a) i) 0.03m (one mark for the answer and one for the formula)
ii) 4050m (one mark for the formula; don’t forget to halve the distance you calculate since the microwaves need to come back)
b) 7 * 10^8 J
c) 2.125 m/s^2 (one mark for the formula)
3 (page 7)
a) 38 500J (use 55m because this is the distance in the direction of the force [gravity])
b) The pointed area has a small area for large pressure.
The disc has a large area for small pressure.
c) There is less friction so she can go faster (and use/lose less energy).
10) a) i) The ray of light should travel in straight lines. It should reflect off the boundary with approximately equal angles of incidence and reflection.
ii) The signal travels faster / can carry more signals at once / less interference / it is more resistant to moisture.
Paper 6 2011
Please note that we did not spend much time practising paper 6 questions in class, so please do these questions and check your answers carefully!
i) In the force column: 0.2, 0.3, 0.4
Note: the force in Newtons for a 200g object should be 2N (not 0.2N) since Weight = mass * gravity, so this appears to be a mistake in the exam paper. However, I cannot find any corrections in the marking guide or online.
ii)Increase in length: 50, 68
iii) One mark for labelling the axes (with a quantity and unit), one mark for points correctly plotted and one mark for a STRAIGHT line of best fit through the origin (0,0 mark).
iv) The relationship is proportional/linear because the graph is a straight line.
v) 42mm +/- 1mm. You must clearly show this on the graph by tracing up from 0.25N, marking the point on the line of best fit.
5. a) 51.5cm^3 and 54.8cm^3 (+/- 0.1)
ii) 1.5cm^3 and 4.8cm^3
b) 31.3g and 42.8g
c) 11.3, 20.9 and 8.9
d) lead, gold and copper.
