O Level

w w ap eP m e tr .X w UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS s er om .c GCE Ordinary Level MARK SCHEME for the October/November 2008 question paper 5054 PHYSICS 5054/02 Paper 2 (Theory), maximum raw mark 75 This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began. All Examiners are instructed that alternative correct answers and nexpected approaches in candidates’ scripts must be given marks that fairly reflect the relevant knowledge and skills demonstrated. Mark schemes must be read in conjunction with the question papers and the report on the examination. †¢ CIE will not enter into discussions or correspondence in connection with these mark schemes. CIE is publishing the mark schemes for the October/November 200 8 question papers for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses. Page 2 Mark Scheme GCE O LEVEL – October/November 2008 Syllabus 5054Paper 2 Do not accept fractions. No penalty for [ 2 s. f. unless stated or for 1 s. f. where exactly correct. Only one unit and only one fraction penalty per question. Section A 1 (a) 0. 5(0) m B1 C1 A1 (a) mgh or F ? d or 10 ? 700 (–)7000 J C1 A1 (b) Q/E/H = mc? T or (? T =) 7000/(1) ? 4200 1. 7 or 1. 67 or 5. 5 8. 9  °C e. c. f. (a) 4 B1 (b) rotates/tilts/unbalanced/one side down/one side up rotates anticlockwise/down on left or head down or foot up (net) anticlockwise moment or moment on left > moment on right or weight/CM on left of pivot 3 B1 B1 B1 B1 (b) 10(. 0) N or e. c. f. (a) diagram of two forces and resultant W / 6(N) and T / 8(N) marked on perp. forces or scale given 10(. 0  ±0. 2) N 35–39 ° from T/Y/horizontal or 51–55 ° from W/vertical an d correct resultant C1 C1 A1 (a) (i) (a = ? )v/t or 84/35 2. 4 m/s? C1 A1 (ii) speed and time axes correct and labelled straight line of positive gradient through origin 84 (m/s) and 35 (s) marked (b) (i) two arrows with forward force > backward force (ii) air/wind resistance or friction or drag  © UCLES 2008 B1 [5] [4] [5] B1 B1 B1 B1 B1 [7] Page 3 5 Mark Scheme GCE O LEVEL – October/November 2008 Syllabus 5054 a) Any two pairs – may be expressed in terms of the gas: liquid M1 molecules dense(r) close(r)/touching incompressible/volume fixed close(r) or strong(er) forces fills bottom container forces strong(er) expands less when heated forces strong(er) more viscous/flows slower forces strong(er) sound fast(er) close(r) or strong(er) forces better conductors of heat close(r) slower diffusion close(r) Paper 2 A1 (b) molecules gain speed/energy/heat and escape/leave cloth/break bonds or latent heat needed fast(er)/high(er) (kinetic) energy molecules escape/evaporate (a verage) speed / (kinetic) energy (of remainder) decreases r temperature related to (average) energy/speed of molecules 6 M2 A2 B1 B1 B1 (a) red B1 (b) (i) equal to B1 (ii) less than B1 (c) two correct refractions on Fig. 6. 2 no dispersion and ray ends close to P (a) 12(. 0) V B1 B1 B1 B1 (c) (E=) QV or VIt or 200 ? 12 2400 J accept 2370–2410 J e. c. f. 8 M1 A1 (b) top row: 4. 6 and 0 bottom row: square 1 = square 2 + square 3 or 9. 2 bottom row: 4. 6 in squares 2 and 3 cao 7 [7] C1 A1 (a) fusion B1 (b) (i) mass decreases or product/nuclei/atoms less massive mass becomes/converted to energy B1 B1 (ii) E = mc2 6. 6 ? 10–29 ? (3. 0 ? 108)2 5. 9 ? 0–12 or 5. 94 ? 10–12 J B1 C1 A1  © UCLES 2008 [5] [6] [6] Page 4 Mark Scheme GCE O LEVEL – October/November 2008 Syllabus 5054 Paper 2 Section B 9 (a) (i) Any three lines: vibration of cone/loudspeaker vibration of air/particles (molecules) particles/molecules pass on vibrations/energy (to neighbours) com pressions and rarefactions or longitudinal wave/movement of particle (max 3) B1 B1 B1 B1 (ii) loud – large amplitude/max displacement low-pitched – frequency/no. of waves per sec low frequency, small frequency, etc. (long wavelength 1/2) B1 M1 A1 (iii) (t =) d/s or 0. 57/330 0. 0017 s C1 A1 iv) speed of sound greater in water/liquid or v. v. less time taken in water/liquid or heard sooner/faster B1 B1 [10] (b) (i) v = f? or 200 seen (? =) v/f or 330/200 or 330/0. 2 or 1650 (m) 1. 6/1. 65/1. 7 m (ii) attempt at compressions and rarefactions/longitudinal wave correct wavelength marked C1 C1 A1 M1 A1 [5] [Total: 15]  © UCLES 2008 Page 5 Mark Scheme GCE O LEVEL – October/November 2008 Syllabus 5054 10 (a) (i) at least 2 concentric, complete circles increasing gap at least 1 anticlockwise arrow and none incorrect (ii) stronger or more lines or lines closer together or extends further (b) (i) (R =) V/I or 6. /8. 0 0. 75 ? Paper 2 B1 B1 B1 B1 [4] C1 A1 (ii) (Q =) It or 8. 0 ? 120 or 8. 0 ? 2 960 C (16 C scores 1/2) C1 A1 (c) (i) L>R or N>S [4] B1 (ii) force (on wire) or wire bends/moves into page/perpendicular to field/away (from us)/LH rule quoted M1 A1 (iii) force reverses or out of page or bends the other way e. c. f. B1 [4] (iv) accept first two marks on unlabelled diagram (wire becomes) coil / armature /solenoid force/movement opposite on sides of coil or moment current reverses during rotation/due to commutator or split ring B1 B1 B1 [3] [Total: 15]  © UCLES 2008 Page 6 Mark SchemeGCE O LEVEL – October/November 2008 Syllabus 5054 11 (a) (P =) VI or 6. 0 ? 1. 6 9. 6 W Paper 2 C1 A1 (b) (i) filament/J releases electrons or thermionic emission attracted by +ve terminal/metal plate/K electrons move/accelerate [2] B1 B1 B1 (ii) otherwise electrons hit (air) molecules/particles/lose energy or electrons deflected/don’t hit screen/cause ionisation of air B1 (iii) electrons/charges/beam/ray deflected (by magnetic field) few(er) ele ctrons reach plate/K/+ve terminal/pass round circuit B1 B1 (iv) current = 0 or no reading electrons repelled by or not attracted to K or K does not emit electrons B1 c) (i) (dot/speck of light) moves so fast (that the eye sees it as a single line) or timebase pulls it horizontally or voltage is constant/zero B1 [8] B1 (ii) (line/trace) displaced vertically at uniform rate/speed or slowly moves 3. 0 divisions/3cm M1 A1 B1 (iii) screen not high enough or trace moves beyond edge of screen or line moves 6cm / more than 4cm (vertically) or line can only move 4cm or screen is only 4cm from middle to top B1 [5] [Total: 15] B1 Independent mark C1 Compensation mark; given also if the answer is correct M1 Method mark: if not given, subsequent A marks are not awarded A1 Answer mark.  © UCLES 2008