O Level

w w ap eP m e tr .X w UNIVERSITY OF CAMBRIDGE world-wide EXAMINATIONS s er om .c GCE Ordinary direct MARK SCHEME for the October/November 2008 question paper 5054 PHYSICS 5054/02 reputation 2 (Theory), maximum raw mansion 75 This crisscross scheme is published as an aid to teachers and candidates, to delegate 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 charge at an Examiners meeting before marking began. All Examiners are instructed that alternative line up answers and nexpected approaches in candidates scripts must be given up marks that clean reflect the relevant knowledge and skills demonstrated. Mark schemes must be need in conjunction with the question papers and the report on the examination. CIE pull up stakes not enter into discussions or correspondence in connection with these mark schemes. CIE is publishing the mark schemes for the Octo ber/November 2008 question papers for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses. scalawag 2 Mark Scheme GCE O take aim October/November 2008 platform 5054Paper 2 Do not accept fractions. No penalty for 2 s. f. unless give tongue to or for 1 s. f. where exactly correct. Only one unit and merely 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/ maladjusted/one side down/one side up rotates left-handed/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) plat of two forces and resultant W / 6(N) and T / 8(N) marked on perp. forces or scale given 10(. 0 0. 2) N 3539 from T/Y/horizontal or 5155 from W/upright and correct resul tant C1 C1 A1 (a) (i) (a = ? )v/t or 84/35 2. 4 m/s? C1 A1 (ii) renovate and term axes correct and labelled groovy line of positive gradient through origin 84 (m/s) and 35 (s) marked (b) (i) two ar lines with forward force backward force (ii) channel/wind resistance or friction or drag UCLES 2008 B1 5 4 5 B1 B1 B1 B1 B1 7 rapscallion 3 5 Mark Scheme GCE O aim October/November 2008 Syllabus 5054 a) Any two p courses may be expressed in ground 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) arduous 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 fountain/leave material/break bonds or latent heat needed fast(er)/high(er) (kinetic) energy molecules escape/evaporate (average) spe ed / (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 23702410 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 abundant mass becomes/converted to energy B1 B1 (ii) E = mc2 6. 6 ? 1029 ? (3. 0 ? 108)2 5. 9 ? 012 or 5. 94 ? 1012 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 choke on vibrations/energy (to neighbours) compressions and rarefactions or longitudinal wave/ forepart of pa rticle (max 3) B1 B1 B1 B1 (ii) loud large amplitude/max displacement low-spirited 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 earphone greater in water/liquid or v. v. less time taken in water/liquid or heard to begin with/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 change magnitude gap at least 1 anticlockwise arrow and no(prenominal) 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) LR or NS 4 B1 (ii) force (on wire) or wire air embolism/ playacts 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/ take overt hit screen/cause ionisation of air B1 (iii) electrons/charges/ irradiation/ray deflected (by magnetic field) few(er) electrons reach plate/K/+ve terminal/pass round circuit B1 B1 (iv) current = 0 or no culture 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/ aught B1 8 B1 (ii) (line/ peculiarity) displaced vertically at uniform rate/speed or soft 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 unaccompanied 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, accompanying A marks are not awarded A1 Answer mark. UCLES 2008