PHYSICS 5054/11 Paper 1 Multiple Choice October/November 2016 MARK SCHEME Maximum Mark: 40. Published

Transcription

1 Cambridge International Examinations Cambridge Ordinary Level PHYSICS 5054/11 Paper 1 Multiple Choice October/November 2016 MARK SCHEME Maximum Mark: 40 Published 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, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the October/November 2016 series for most Cambridge IGCSE, Cambridge International A and AS Level components and some Cambridge O Level components. IGCSE is the registered trademark of Cambridge International Examinations. This document consists of 2 printed pages. [Turn over

2 Page 2 Mark Scheme Syllabus Paper Cambridge O Level October/November Question Number Key Question Number Key 1 D 21 C 2 D 22 A 3 D 23 C 4 C 24 C 5 A 25 B 6 C 26 B 7 C 27 D 8 B 28 B 9 D 29 A 10 B 30 D 11 C 31 B 12 D 32 B 13 D 33 D 14 C 34 B 15 B 35 A 16 C 36 A 17 B 37 D 18 C 38 A 19 B 39 B 20 A 40 A

3 Cambridge International Examinations Cambridge Ordinary Level PHYSICS 5054/12 Paper 1 Multiple Choice October/November 2016 MARK SCHEME Maximum Mark: 40 Published 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, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the October/November 2016 series for most Cambridge IGCSE, Cambridge International A and AS Level components and some Cambridge O Level components. IGCSE is the registered trademark of Cambridge International Examinations. This document consists of 2 printed pages. [Turn over

4 Page 2 Mark Scheme Syllabus Paper Cambridge O Level October/November Question Number Key Question Number Key 1 D 21 B 2 D 22 D 3 C 23 B 4 C 24 B 5 A 25 A 6 D 26 A 7 A 27 B 8 B 28 A 9 C 29 A 10 C 30 B 11 D 31 D 12 B 32 B 13 C 33 C 14 B 34 B 15 C 35 C 16 A 36 B 17 D 37 B 18 C 38 C 19 C 39 B 20 C 40 A

5 Cambridge International Examinations Cambridge Ordinary Level PHYSICS 5054/21 Paper 2 Theory October/November 2016 MARK SCHEME Maximum Mark: 75 Published 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, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the October/November 2016 series for most Cambridge IGCSE, Cambridge International A and AS Level components and some Cambridge O Level components. IGCSE is the registered trademark of Cambridge International Examinations. This document consists of 5 printed pages. [Turn over

6 Page 2 Mark Scheme Syllabus Paper Cambridge O Level October/November Section A 1 (a) velocity / it has a direction / is a vector (b) (i) (F = )ma or N A1 (ii) friction / air resistance acts on car opposes force due to engine (iii) ( v = )at or or m / s A1 [7] 2 (a) 260 N (b) (i) for a body in equilibrium (total) clockwise moment = (total) anticlockwise moment (ii) F 1 d 1 = F 2 d 2 or or 91 or F = F 0.65 or /0.65 or 91 = F 0.65 or 91/ N A1 [6] 3 (a) chemical (potential energy) (b) (i) non-renewable and oil / it is not replaced / will run out (ii) acid rain or produces CO 2 or warms lakes / rivers / sea or global warming or greenhouse effect (c) (i) useful energy output / (total) energy input or power for energy twice (ii) /0.38 or / W A1 2 (E = )Pt or ( 3600) or ( ) 10 9 etc J A1 [8] 4 (a) smallest angle for total internal reflection or angle for refraction along surface angle of incidence in (optically) denser medium (b) vertical ray continues undeviated second ray (60 to horizontal) refracts away from normal into the air third ray reflects internally and i = r by eye not if any refracted ray [5]

7 Page 3 Mark Scheme Syllabus Paper Cambridge O Level October/November (a) number of oscillations / vibrations / wavelengths / compressions / rarefactions / cycles per second / unit time (b) (i) ( λ = )c / f or 330 / m A1 (ii) 1 no change and 2 increases (c) (i) 1 loudspeaker vibrates / oscillates / moves to and fro (and collides with molecules) 2 compressions and rarefactions / molecules vibrate / longitudinal wave vibration / oscillation / energy passed on (ii) fewer / no molecules / particles and less / no energy / vibration transferred [8] 6 (a) (i) X N-pole Y S-pole and Z N-pole (ii) they touch / move towards each other and opposite poles attract (b) any sensible use: starting-motor circuit; with a logic gate; nuclear power station corresponding explanation: current too large for dash-board switch; current too small to power device; too dangerous to reach switch [5] 7 (a) (i) supplies the (mains) e.m.f. / voltage (ii) to complete the circuit / is at 0 V (b) (i) the circuit / supply is cut / broken or current stops fuse melts / blows / burns (ii) live wire when it cuts the circuit / melts no part of the appliance is live / no shock [6] [45]

8 Page 4 Mark Scheme Syllabus Paper Cambridge O Level October/November Section B 8 (a) (i) 11 protons and 11 electrons 13 neutrons electrons in orbit / surrounding nucleus or neutrons and protons in nucleus (ii) one more neutron (in sodium-24) or one fewer neutron in sodium-23 [4] (b) (i) electron 0 (ii) 1 ( β ) cao 24...(Mg) (Mg) [4] (c) electromagnetic (radiation / rays / waves) M1 (very) high frequency / energy or (very) short wavelength A1 [2] (d) (i) path curving upwards (ii) path continues in straight line (iii) beta-particle charged or gamma-ray uncharged [3] (e) long enough short enough or to take measurements so the body is not irradiated for long [2] [15] 9 (a) (i) magnetic field mentioned alternating / changing magnetic field current / voltage / e.m.f. induced (in secondary coil) (ii) diode [5] (b) (i) work done / energy transferred per unit charge electrical energy to other forms or for whole circuit or property of supply M1 A1

9 Page 5 Mark Scheme Syllabus Paper Cambridge O Level October/November (ii) V 2 (I = )V/R or 1.3/ A A1 3 (Q = )It or or or 0.37/0.375/ / 1350 / 1400 C A1 [8] (c) plastic / casing is an (electrical) insulator M1 no shock possible A1 [2] [15] 10 (a) (i) molecules / they close together or small gaps between molecules (ii) molecules / they exert large (repulsive) forces [2] (b) (i) (V = )m/ρ or 680 / cm 3 or m 3 A1 (ii) 1 molecules vibrate molecules vibrate collide with neighbours or collide with electrons transfer vibration / energy electrons travel through metal 2 heated / hot oil expands / less dense rises convection current/circulation established 3 any suitable named insulator and it is a poor conductor [9] (c) (i) temperature at which (liquid) vaporises / becomes gas / steam (ii) (Q = )mc T or (260 20) or J A1 (iii) heat supplied to pan or heat lost to air / surroundings [4] [15]

10 Cambridge International Examinations Cambridge Ordinary Level PHYSICS 5054/22 Paper 2 Theory October/November 2016 MARK SCHEME Maximum Mark: 75 Published 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, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the October/November 2016 series for most Cambridge IGCSE, Cambridge International A and AS Level components and some Cambridge O Level components. IGCSE is the registered trademark of Cambridge International Examinations. This document consists of 5 printed pages. [Turn over

11 Page 2 Mark Scheme Syllabus Paper Cambridge O Level October/November Section A 1 (a) (v = u + )at or m / s A1 (b) (i) 0 or zero or no resultant force (ii) straight line of positive gradient from (0, 0) horizontal line at v > 0 and after initial acceleration straight line from (0, 0) to (5.0, 17) and straight line from (5.0, 17) to at least (15.0, 17) (iii) calculate the area under the graph or area of trapezium [7] 2 (a) (i) (GPE = )mgh or J (ii) kinetic either order thermal / internal / heat / sound either order (b) (i) upwards / centripetal / towards centre (of circle) (ii) it / weight less (than normal contact force) or upward force greater [6] 3 (a) (i) 20 N (ii) 1. (Γ = )Fd or or or N m A1 2. friction (at hinge / seal) or air resistance or to cause an initial acceleration (b) (for other directions) perpendicular distance is less [5] 4 (a) temperature at which liquid / water turns to gas / vapour / steam (b) (i) (T = )24 ( C) or or 76 ( Q = )mc T or J A1 (ii) heat is lost (to the surroundings) or evaporation at higher temperatures heat is lost at greater rate (c) (i) stays at 100 C / constant (ii) molecules separate / are pulled apart / are far apart / break bonds / overcome forces of attraction work done separating the molecules or molecules gain PE [9]

12 Page 3 Mark Scheme Syllabus Paper Cambridge O Level October/November (a) atoms / molecules / particles move / collide atoms / molecules / particles collide with walls / piston collisions cause forces (b) (p 2 = )p 1 V 1 / V 2 or / Pa A1 [5] 6 (a) any three of: filament is heated / hot or thermionic (emission) mentioned electrons negative or electrons escape / are emitted electrons attracted / accelerated by a positive charge / high potential / anode opposite charges attract or positive (anode) attracts negative (electrons) B3 (b) no collisions with air / particles or allows electrons to reach the screen (c) electron beam is a current or moving charges M1 deflected by a magnetic field or experience force in magnetic field A1 [6] 7 (a) 94 electrons and 94 protons 144 neutrons (only) electrons in orbit / surrounding nucleus or (only) protons and neutrons in nucleus (b) (i) (beta-particles) weak(er) (beta-particles) strong(er) (ii) any two lines from glasses / goggles or lead container / shield / clothing / gloves tweezers / manipulator / carry in large cardboard box minimise time of exposure / film badge B2 [7] [45]

13 Page 4 Mark Scheme Syllabus Paper Cambridge O Level October/November Section B 8 (a) (i) N (ii) line curved line (curved) upwards [3] (b) (i) (P = )hρg or or Pa A1 (ii) (F = )PA or or or N A1 (iii) 1.4 N or (a)(i) + (b)(ii) calculated [6] (c) (i) (atmospheric pressure) exerts a downward force / pressure (on top of the block) (cancels out the) extra upward force / pressure (ii) (vector) has direction (in addition to magnitude) [3] (d) any three lines from force due to water increases force due to spring decreases increased pressure (at base) they add to give a constant value / weight of block or total force constant B3 [3] [15] 9 (a) rate of flow of charge or charge flowing per unit time [1] (b) (i) 7.5 V (ii) (R = )V / I or 7.5 / Ω A1 (iii) (P = ) VI or W A1 (iv) resistance increases M1 (reading of ammeter) decreases A1 [7] (c) (i) at least two lines on left and two lines on right of core and correct shape (by eye) good shape (by eye) and into poles and no straight sections and at least one line on each side at least one arrow N to S (primarily upwards) and none wrong [3]

14 Page 5 Mark Scheme Syllabus Paper Cambridge O Level October/November (ii) 1 cylinder is magnetised (by induction) top (of cylinder) is an S-pole unlike poles attract or S-pole attracts N-pole 2 it does not (remain in contact) and iron is temporary / soft magnetic material / core (and cylinder) lose magnetisation [4] [15] 10 (a) (i) m / s (ii) (λ = )c /f or / m A1 [3] (b) (i) decreases (ii) sin(i) = n sin(r) or 1.5 sin(30 ) or A1 (iii) 41 [4] (c) (i) dispersion at both surfaces and refractions in correct direction violet / blue light below the red light shown (ii) spectrum or band of (continuous) colours or colours of rainbow red, orange, yellow, green, blue, (indigo, violet) (iii) 1 X marked above red 2 it is / black surfaces are good absorbers (of IR radiation) [6] (d) intruder / human being emits IR intruder warm or IR detected or IR beam broken does not reach detector or IR reflected change detected [2] [15]

15 Cambridge International Examinations Cambridge Ordinary Level PHYSICS 5054/31 Paper 3 Practical Test October/November 2016 MARK SCHEME Maximum Mark: 30 Published 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, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the October/November 2016 series for most Cambridge IGCSE, Cambridge International A and AS Level components and some Cambridge O Level components. IGCSE is the registered trademark of Cambridge International Examinations. This document consists of 3 printed pages. [Turn over

16 Page 2 Mark Scheme Syllabus Paper Cambridge O Level October/November (a) (i) L 0 measured to the nearest mm or better and in the range 1.5 cm to 3.0 cm with consistent unit seen here or in (a)(ii), (a)(iii), (b)(i) or (b)(ii) (ii)(iii) L 1 recorded to the nearest mm or better and e 1 calculated correctly with consistent unit seen here or in (a)(i), (b)(i) or (b)(ii) (b) e 2 < e 1. M1 (c) ρ calculated correctly to 2 / 3s.f. with unit A1 value in range 1.0 g / cm 3 to 2.0 g / cm 3 A1 [5] 2 (a) (i) bottom of the threads are separated by 30.0 cm so the top of the threads must be separated by the same distance owtte / vertical alignment with stands / doorframe etc (ii) ensure that the half-metre rule is horizontal by measuring the height above the bench at each end and finding that they are the same. or aligning with a horizontal line in the room, e.g. windowsill / top of door (b) t in the range 8 s to 16 s with unit seen somewhere in (b) and using at least one repeat measurement with correct average T calculated correctly to 2 / 3 s.f. with unit seen somewhere T in the range 1.0 s to 1.4 s, when rounded [5] 3 (a) V 1 in the range 0.55 V to 0.90 V to 0.01 V or better with unit seen here or in (c) and I 1 in the range 0.30 A to 0.50 A to 0.01 A or better with unit seen here or in (c) (b) correct calculation of R 1 in the range 1.0 Ω to 3.0 Ω with unit seen here or in (d) (c) V 2 < V 1 and in the range 0.55 V to 0.90 V to 0.01 V or better with unit seen here or in (a) and I 2 < I 1 and in the range 0.14 A to 0.27 A to 0.01 A or better with unit seen here or in (a) (d) correct calculation of R 2 with R 2 > R 1 with unit seen here or in (b) (e) when the current decreases, the voltage across the diode decreases (slightly) and the resistance of the diode increases or vice versa and comment consistent with results [5]

17 Page 3 Mark Scheme Syllabus Paper Cambridge O Level October/November Preliminary results (a) (i) Approached the formation of the sharp image on the screen from both directions. (ii) u S in the range 79.0 cm to 84.0 cm. Repeated measurements, correctly averaged with unit seen here or in (b)(i) M1 A1 (b) (i) u L in the range 16.0 cm to 21.0 cm with unit seen here or in (a)(ii). (ii) d and y calculated correctly (ignore units and s.f.) [5] (c) Table column headings for D, u S, u L, d and y and units for D, d and y and results from (a)(ii) and (b) included correct calculation of d and y D values in the range 65.0 cm D 95.0 cm at least 5 results showing correct trend, y increases as D increases [4] (d) Graph axes labelled with units and correct orientation. (allow e.c.f. from wrong unit in table but not no units) suitable scale, not based on 3, 6, 7 etc. with plotted data occupying half the page in both directions. (allow origin, if present, to be included) two points plotted correctly check the two points furthest from the line. This mark can only be scored if the scale is easy to follow (points must be within ½ small square of the correct position) best fit fine straight line and fine points or crosses (line thickness to be no greater than the thickest lines on the grid) [4] (e) Calculations use of two points that are on the straight line or two points on a tangent drawn to the curve. (i) use of a triangle that uses more than half the drawn line to calculate the gradient M0 A1 (ii) f in the range 13 (cm) to 17 (cm). (Ignore s.f. and unit) A1 [2]

18 Cambridge International Examinations Cambridge Ordinary Level PHYSICS 5054/32 Paper 3 Practical Test October/November 2016 MARK SCHEME Maximum Mark: 30 Published 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, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the October/November 2016 series for most Cambridge IGCSE, Cambridge International A and AS Level components and some Cambridge O Level components. IGCSE is the registered trademark of Cambridge International Examinations. This document consists of 4 printed pages. [Turn over

19 Page 2 Mark Scheme Syllabus Paper Cambridge O Level October/November (a) t in the range 0 (mm) to 4 (mm) (b) (i) sensible value of D. Repeats shown and correctly averaged, measured to the nearest mm or better (ii) clear description or clear diagram of how values of D obtained accurately. eye vertically above edge of lens on scale / set square used against edge of lens, resting on scale / measurements in two different orientations shown. (c) (i) diagram showing set square on each side of the lens (like the jaws of vernier callipers) (ii) and sensible T in the range t < T 10 mm (d) correct calculation of f giving an answer in the range 7.5 cm to 30.0 cm with consistent unit with elsewhere in (a), (b)(i) or (c)(ii). (Ignore s.f.) [5] 2 (a) decreases owtte (b)(i)(ii) T 1 = their t 1 / 10 T 1 given to 2 / 3 s.f. Correct unit seen in (b) or (c) (c) t 2 > t 1 (d) T 2 / T 1 in the range 1.0 to 1.2 when rounded (ignore unit) [5] 3 (a) V 1 in the range 1.8 V to 2.8 V to 0.1 V or better with unit seen here or in (b). and I 1 in the range 0.18 A to 0.28 A to 0.01 A or better with unit seen here or in (b) (b) V 2 > V 1 and in the range 2.4 V to 4.0 V to 0.1 V or better with unit seen here or in (a) and I 2 < I 1 and in the range 0.10 A to 0.20 A to 0.01 A or better with unit seen here or in (a). (c) (increasing the resistance) reduces the current which increases the voltmeter reading or vice versa (d) correct calculation of R from their (a) and (b) note B0 if sign error in calculation R in the range 6.0 Ω to 20.0 Ω to 2/3 s.f. and unit [5]

20 Page 3 Mark Scheme Syllabus Paper Cambridge O Level October/November Preliminary results (a) y measured to the nearest mm or better and in the range 1.5 cm to 3.0 cm with consistent unit seen here or in (b) (b) (i) x in the range 39.6 cm to 40.4 cm to nearest mm or better and with consistent unit seen here or in (a) or (b)(ii) (ii) correct determination of e in the range 9 cm to 14 cm with unit seen here or in (a) or (b)(i) (iii) diagram or explanation measured the height of the metre rule above the bench in at least 2 places (and found to be equal) / Horizontal alignment with window sill / top of door etc. [4] Table (c) column headings with units for x, L and e and results from (b) included correct calculation of e x values 50 cm at least 5 results showing correct trend, e increases as x increases [4] Graph (d) axes labelled with units and correct orientation (allow e.c.f. from wrong unit in table but not no units) suitable scale, not based on 3, 6, 7 etc. with plotted data occupying half the page in both directions two points plotted correctly check the two points furthest from the line. This mark can only be scored if the scale is easy to follow (points must be within ½ small square of the correct position) best-fit fine straight line and fine points or crosses [4] (line thickness to be no greater than the thickest lines on the grid)

21 Page 4 Mark Scheme Syllabus Paper Cambridge O Level October/November Calculations (e) correct readings used for a pair of points on the line used for the gradient determination (triangle seen or implied) more than half the drawn line used for points correct calculation of gradient in the range 0.2 to 0.3 when rounded (ignore unit) [3]

22 Cambridge International Examinations Cambridge Ordinary Level PHYSICS 5054/41 Paper 4 Alternative to Practical October/November 2016 MARK SCHEME Maximum Mark: 30 Published 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, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the October/November 2016 series for most Cambridge IGCSE, Cambridge International A and AS Level components and some Cambridge O Level components. IGCSE is the registered trademark of Cambridge International Examinations. This document consists of 3 printed pages. [Turn over

23 Page 2 Mark Scheme Syllabus Paper Cambridge O Level October/November (a) correct subtraction 51.3(g) seen / 3.66 / 3.7 g (b) any 2 temperature position e.g. in sun draughts humidity B2 (c) any sensible apparatus e.g. heater / sun lamp / fan [Total marks: 5] 2 (a) car drawn at bottom of ramp B0 distance l marked correctly distance h marked correctly (b) metre rule / half metre rule/ruler/tape (measure) accuracy e.g. use of set square to ensure vertical/ avoid parallax error explained (c) (i) large variation in data for each reading (so this degree of accuracy is enough) (ii) table completed 123, 153, 188 one or two correct and to the nearest cm - 1 mark all correct more than 3sf 1 mark (iii) axes labelled quantity and unit axis labels correct way round scales linear, not awkward, start from (0,0) points plotted accurately best fit curve drawn (iv) as h increases l av increases B2 (d) range 2.5 to 2.9 (cm) [Total marks: 13]

24 Page 3 Mark Scheme Syllabus Paper Cambridge O Level October/November (a) ammeter in series with correct symbol voltmeter in parallel with correct symbol (b) (i) 1.2 A and 8.6 V (ii) J / (kg C) (c) any 2 sensible suggestions e.g. aluminium block not lagged / heat loss (to air) did not wait for thermometer to reach maximum after power is switched off did not ensure heater fully immersed in block no oil to improve thermal conductivity with heater or thermometer zero errors on meters B2 [Total marks: 7] 4 (a) means of measuring more than one diameter described measures at least 5 and averages accuracy detail e.g. use of set squares described/ensure all straws are touching (b) (Fill straw with water) and use measuring cylinder accuracy detail e.g. 5 or 10 cm 3 measuring cylinder used or burette or pipette used or repeat and average or filling 10 / all straws / a number of straws [Total marks: 5]

25 Cambridge International Examinations Cambridge Ordinary Level PHYSICS 5054/42 Paper 4 Alternative to Practical October/November 2016 MARK SCHEME Maximum Mark: 30 Published 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, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the Principal Examiner Report for Teachers. Cambridge will not enter into discussions about these mark schemes. Cambridge is publishing the mark schemes for the October/November 2016 series for most Cambridge IGCSE, Cambridge International A and AS Level components and some Cambridge O Level components. IGCSE is the registered trademark of Cambridge International Examinations. This document consists of 3 printed pages. [Turn over

26 Page 2 Mark Scheme Syllabus Paper Cambridge O Level October/November (a) (i) 64(cm 3 ) (ii) reading top of meniscus instead of bottom / parallax error explained (b) (i) balance / scales (ii) find mass using tare / subtract mass of measuring cylinder from that of measuring cylinder + liquid (density) = mass/volume (c) smaller value for density [Total: 6] 2 (a) (i) crocodile clips (ii) (close jaws) gently or use ratchet / thimble / spindle or until wheel slips repeat at different places / positions (and average) (iii) (using π button) / (using 3.14) / (using 22 / 7) A1 (b) (i) axes labelled quantity and unit and axes correct way round scales linear, not awkward, start from (0,0) points plotted accurately best-fit straight line drawn (ii) large triangle or any other indication of chosen points shown on graph 93 ± 2 accept numbers rounding down to 95 and up to 91 not accept fractional values (iii) candidate s (a)(iii) 200 (b)(ii) answer correct (must be checked) in standard form A1 [Total: 13]

27 Page 3 Mark Scheme Syllabus Paper Cambridge O Level October/November (a) orange, orange brown (b) power supply, fixed resistor and diode (any orientation) in series ammeter in series (with diode and resistor) voltmeter across diode (c) variable power supply add rheostat / variable resistor add resistor (in series) / use different values of resistor add cells / batteries (d) reverse power supply reverse diode / it [Total: 7] 4 (a) 27 (b) (i) range range (ii) 4 their (b)(i) A1 [Total: 4]