Cambridge IGCSE Physics 0625 — 2013 May/June Paper 2 · Variant 2

This document consists of 20 printed pages. DC (NH/SW) 58288/5 © UCLES 2013 [Turn over UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education * 1 9 6 7 5 2 6 8 8 8 * PHYSICS 0625/22 Paper 2 Core May/June 2013 1 hour 15 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use a pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. Electronic calculators may be used. You may lose marks if you do not show your working or if you do not use appropriate units. Take the weight of 1 kg to be 10 N (i.e. acceleration of free fall = 10 m / s2). At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. www.XtremePapers.com

2 0625/22/M/J/13 © UCLES 2013 For Examiner’s Use 1 The highlight of Super Academy’s athletics calendar is the end-of-year cross-country race. This is a circular race over a distance of 6.0 km. By tradition, it starts and ends below the school clock tower. Student Goodrunner is the school’s fastest athlete. His dream is to beat the school record for the race, which is 26 minutes. At the start of the race, the school clock looks as shown in Fig. 1.1. 12 11 10 9 8 7 5 4 3 2 1 6 Fig. 1.1 As student Goodrunner crosses the finishing line, the school clock looks as shown in Fig. 1.2. 12 11 10 9 8 7 5 4 3 2 1 6 Fig. 1.2

3 0625/22/M/J/13 © UCLES 2013 [Turn over For Examiner’s Use (a) (i) Calculate Goodrunner’s race time. Show your working. race time = … minutes (ii) Did Goodrunner beat the record? yes no  [3] (b) Calculate Goodrunner’s average speed during the race. average speed = … m / s [3] [Total: 6]

4 0625/22/M/J/13 © UCLES 2013 For Examiner’s Use 2 A piece of stiff cardboard is attached to a plank of wood by two sticky-tape “hinges”, as shown in Fig. 2.1. stiff cardboard sticky-tape “hinge” plank of wood Fig. 2.1 (a) The cardboard in Fig. 2.1 is to be lifted by a vertical force F, so that it turns about the hinges. (i) What name do we give to the turning effect of a force? …[1] (ii) Force F is to be as small as possible. On Fig. 2.1, show force F, positioned so that it fulfils this requirement. [1] (b) A box of matches is balanced on the cardboard, as shown in Fig. 2.2. super matches Fig. 2.2 (i) The left-hand edge of the cardboard is gradually raised. The box does not slide. What will eventually happen to the box of matches as the edge is raised? …[1] (ii) State where the centre of mass of the box is positioned when this happens. … …[2]

5 0625/22/M/J/13 © UCLES 2013 [Turn over For Examiner’s Use (c) Filing cabinets often have a mechanism that prevents more than one drawer being opened at a time. Fig. 2.3 shows a filing cabinet standing on the floor with the middle drawer open. Fig. 2.3 State and explain why it might be dangerous to open the top drawer at the same time as the middle drawer. … … … …[2] [Total: 7]

6 0625/22/M/J/13 © UCLES 2013 For Examiner’s Use 3 (a) A spring is hung from a support. A load, hung on the spring, makes it extend. Describe how you would use a ruler to measure the extension. … … … … … …[3] (b) The lengths of the spring are found for loads of various weights. From these lengths, the extensions are calculated. Most of the results are shown in the table below. load / N length / mm extension / mm 0 200 0 1.0 220 20 2.0 249 49 3.0 258 4.0 279 79 5.0 97 6.0 318 118 (i) Calculate the two missing values and insert them in the table. [1] (ii) On Fig. 3.1, plot the values of extension against load, but do not draw the line yet. [2]

7 0625/22/M/J/13 © UCLES 2013 [Turn over For Examiner’s Use 0 0 20 40 60 80 100 120 1 2 3 4 5 6 load / N extension / mm Fig. 3.1 (iii) A mistake was made with one of the length values. State the value of the length that is incorrect. … [1] (iv) Ignoring the value in (iii), draw the best-fit straight line through your points and the origin. [1] (v) Complete the following sentences. Within the limits of the experiment, when the load doubles, the extension of the spring … . The straight-line graph through the origin shows that the extension and the load are … . [2] [Total: 10]

8 0625/22/M/J/13 © UCLES 2013 For Examiner’s Use 4 Fig. 4.1 shows a typical laboratory liquid-in-glass thermometer. –10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150°C liquid capillary tube Fig. 4.1 (a) What is seen happening when the thermometer is put into a hot liquid? … …[1] (b) Why does this happen? … …[1] (c) On Fig. 4.1, clearly mark with an arrow the point that the liquid will reach when the thermometer is put in pure boiling water at standard atmospheric pressure. [1] (d) State why it is necessary for the capillary tube to be very narrow. … … …[1] [Total: 4]

9 0625/22/M/J/13 © UCLES 2013 [Turn over For Examiner’s Use 5 (a) The descriptions in the table below each give information about the molecules of a substance. In the space alongside each description, write the state of the substance being described. description state of the substance The molecules are close together but not tightly-packed. They move around amongst each other. The molecules of the substance exert virtually no force on each other. They move around freely and fill their container. The molecules are tightly-packed. They have “fixed” positions, about which they can only vibrate. During these vibrations, they exert strong forces on each other. [2] (b) Which word is used to describe what is happening (i) when a solid turns to a liquid, without change of temperature, … (ii) when a gas turns to a liquid, without change of temperature, … (iii) when more molecules of a liquid are escaping from the surface than are returning to it? … [3] [Total: 5]

10 0625/22/M/J/13 © UCLES 2013 For Examiner’s Use 6 Fig. 6.1 shows a converging lens with an object placed to one side of it. Points F1 and F2 are the principal foci of the lens. F2 object F1 Fig. 6.1 (a) On Fig. 6.1, mark the focal length of the lens, showing clearly where it starts and finishes. [2] (b) One ray has been drawn through the lens from the top of the object. (i) On Fig. 6.1, draw another ray to locate the image of the top of the object. Draw and label the image of the whole object. [2] (ii) State two ways in which this image differs from the object. 1. … 2. … [2] [Total: 6]

11 0625/22/M/J/13 © UCLES 2013 [Turn over For Examiner’s Use 7 A student has devised the circuit in Fig. 7.1 to control the lighting of three lamps, A, B and C. A B C 3 2 1 4 5 Fig. 7.1 More than one switch must be closed in order to light any lamp. (a) In the table below, put ticks to indicate which switches must be closed in order to light the lamps. The first row has been completed for you. lamp that is lit switches closed 1 2 3 4 5 lamp A only ✓ ✓ ✓ lamp B only lamp C only [3] (b) All the switches are now closed. Which of the lamps light up? … [1] (c) Which one switch must be open to ensure that none of the lamps light up? … [1] [Total: 5]

12 0625/22/M/J/13 © UCLES 2013 For Examiner’s Use 8 (a) There is a current in a wire. (i) What is moving in the wire, to create this current? … (ii) What must be done to the wire in order to cause a current? … (iii) In which unit do we measure the current? … [3] (b) Fig. 8.1 shows a circuit connected to a 6.0 V power supply. Ignore the resistance of the power supply and the ammeter. A 8.0 1  6.0 V + – 4.0 1  Fig. 8.1 (i) Calculate the combined resistance of the two resistors. resistance = … Ω [2] (ii) Calculate the current indicated by the ammeter. Your answer must include the unit. reading = …[3]

13 0625/22/M/J/13 © UCLES 2013 [Turn over For Examiner’s Use (iii) The 8.0 Ω resistor is replaced by another resistor with a larger resistance. Without further calculation, state the effect this has on 1. the ammeter reading, … 2. the potential difference across the 4.0 Ω resistor. … [2] [Total: 10]

14 0625/22/M/J/13 © UCLES 2013 For Examiner’s Use 9 (a) A transformer consists of two coils of insulated wire, wound on a core. State a suitable material from which to make (i) the coils, … (ii) the core. … [2] (b) A lamp has a normal working voltage of 6.0 V. The transformer in Fig. 9.1 is used to enable the 6.0 V lamp to be lit at normal brightness using a 240 V mains supply. 240 V mains 800 turns A B 6.0 V lamp Fig. 9.1 The primary coil has 800 turns. The secondary coil is connected to terminals A and B. Calculate the number of turns in the secondary coil. number of turns = …[3] (c) A technician wishes to use the transformer in Fig. 9.1 to light three 6.0 V lamps. (i) What would happen to the lamps if the technician connected them directly across the mains supply? … …[1]

15 0625/22/M/J/13 © UCLES 2013 [Turn over For Examiner’s Use (ii) On Fig. 9.2 below, show how the three lamps should be connected to terminals A and B, so that they all light with normal brightness 240 V mains 800 turns A B Fig. 9.2 [1] [Total: 7]

16 0625/22/M/J/13 © UCLES 2013 For Examiner’s Use 10 (a) Fig. 10.1 shows a bar magnet. N S Fig. 10.1 (i) On Fig. 10.1, carefully draw the magnetic field pattern around the magnet, ignoring the Earth’s magnetic field. (ii) On one of your lines, draw an arrowhead to show the direction of the field. [4]

17 0625/22/M/J/13 © UCLES 2013 [Turn over For Examiner’s Use (b) Fig. 10.2 shows a coil wound on a hollow cardboard tube. There is a current in the coil. current cardboard tube Fig. 10.2 (i) On Fig. 10.2, carefully draw the magnetic field pattern around and through the coil. You do not need to use arrows to show any directions. [2] (ii) Suggest one material that could be inserted into the tube to increase the strength of the magnetic field. …[1] (iii) What name is given to a current-carrying coil used to provide a magnetic field? Tick one box. capacitor potentiometer relay solenoid [1] [Total: 8]

18 0625/22/M/J/13 © UCLES 2013 For Examiner’s Use 11 (a) The emissions from some radioactive sources are tested. Use the information in the table below to deduce the types of the emissions being described. passes through a sheet of paper passes through 8 mm of aluminium type of emission yes yes yes no no no [2] (b) A radioactive sample has a half-life of x seconds. Which one of the following statements is correct? Tick one box. At a time of x seconds after starting measurements, there will be only half as many atoms in the sample. At a time of x seconds after starting measurements, there will be only half as many atoms of the original sort in the sample. It will take x /2 seconds for all of the atoms in the sample to decay. It will take 2x seconds for all of the atoms in the sample to decay. [1] (c) The number of atoms of a radioactive nuclide in a sample decreases with time, as shown in Fig. 11.1. 0 1000 0 10 time / s number of atoms 20 30 40 2000 3000 4000 5000 Fig. 11.1

19 0625/22/M/J/13 © UCLES 2013 [Turn over For Examiner’s Use (i) Use Fig. 11.1 to find the time taken for the number of atoms to decrease from 4000 to 1000. time = … s (ii) How many half-lives elapse as the number of atoms decreases from 4000 to 1000? … (iii) Calculate the half-life of this nuclide. half-life = … s [3] [Total: 6] Question 12 is on the next page.

20 0625/22/M/J/13 © UCLES 2013 For Examiner’s Use Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. University of Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge. 12 (a) Atoms are composed of protons, neutrons and electrons. (i) Which of these particles has the smallest mass? … (ii) Which two of these types of particle are found in the nucleus? … and … [2] (b) Naturally-occurring chlorine gas contains two types of atom. These are 35 17Cl and 37 17Cl. (i) What does the number 17 tell us about the nuclei of chlorine atoms? …[1] (ii) Which particle does an atom of 37 17Cl contain more of than an atom of 35 17Cl ? …[1] (iii) State the number of electrons in a neutral atom of 1. 35 17Cl, … 2. 37 17Cl. … [2] [Total: 6]

CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education MARK SCHEME for the May/June 2013 series 0625 PHYSICS 0625/22 Paper 2 (Core Theory), maximum raw mark 80 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 May/June 2013 series for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level components and some Ordinary Level components. www.XtremePapers.com

Page 2 Mark Scheme Syllabus Paper IGCSE – May/June 2013 0625 22 © Cambridge International Examinations 2013 NOTES ABOUT MARK SCHEME B marks are independent marks, which do not depend on any other marks. For a B mark to be scored, the point to which it refers must actually be seen in the candidate's answer. M marks are method marks upon which accuracy marks (A marks) later depend. For an M mark to be scored, the point to which it refers must be seen in a candidate's answer. If a candidate fails to score a particular M mark, then none of the dependent A marks can be scored. C marks are compensatory method marks which can be scored even if the points to which they refer are not written down by the candidate, provided subsequent working gives evidence that they must have known it, e.g. if an equation carries a C mark and the candidate does not write down the actual equation but does correct working which shows he knew the equation, then the C mark is scored. A marks are accuracy or answer marks which either depend on an M mark, or which are one of the ways which allow a C mark to be scored. c.a.o. means “correct answer only”. e.c.f. means “error carried forward”. This indicates that if a candidate has made an earlier mistake and has carried his incorrect value forward to subsequent stages of working, he may be given marks indicated by e.c.f. provided his subsequent working is correct, bearing in mind his earlier mistake. This prevents a candidate being penalised more than once for a particular mistake, but only applies to marks annotated “e.c.f.” e.e.o.o. means “each error or omission”. brackets ( ) around words or units in the mark scheme are intended to indicate wording used to clarify the mark scheme, but the marks do not depend on seeing the words or units in brackets, e.g. 10 (J) means that the mark is scored for 10, regardless of the unit given. underlining indicates that this must be seen in the answer offered, or something very similar. OR/or indicates alternative answers, any one of which is satisfactory for scoring the marks. Spelling Be generous about spelling and use of English. If an answer can be understood to mean what we want, give credit. Significant figures Answers are acceptable to any number of significant figures 2, except if specified otherwise, or if only 1 sig. fig. is appropriate. Units Incorrect units are not penalised, except where specified. More commonly, marks are allocated for specific units. Fractions These are only acceptable where specified. Extras Ignore extras in answers if they are irrelevant; if they contradict an otherwise correct response or are forbidden by mark scheme, use right + wrong = 0 Ignore Indicates that something which is not correct is disregarded and does not cause a right plus wrong penalty. Not/NOT Indicates that an incorrect answer is not to be disregarded, but cancels another otherwise correct alternative offered by the candidate i.e. right plus wrong penalty applies.

Page 3 Mark Scheme Syllabus Paper IGCSE – May/June 2013 0625 22 © Cambridge International Examinations 2013 1 (a) (i) use of 2.55 (or 1455) and 3.20 (or 1520) C1 25 (mins) A1 (ii) yes/no, compatible with candidate’s time B1 (b) (speed =) distance ÷ time in any form C1 6 / 25 OR 6000 / 25 OR 6 / (25 × 60) OR 6000 / 1500 e.c.f. (a) OR 0.24 OR 240 OR 0.004 (no e.c.f. if working not shown) C1 4 (m / s) A1 allow e.c.f. from (a) if working shown [Total: 6] 2 (a) (i) moment B1 accept torque (ii) F at/near L.H. edge (ignore not vertical) B1 (b) (i) idea of toppling accept falls (over/onto its side) ignore slides B1 (ii) above or just beyond edge of box OR outside base of box C1 vertically above edge of box OR above R.H. edge of box A1 (c) might topple accept fall (over/forwards) M1 idea of (vertical through) Centre of Mass being outside base OR clockwise moment becomes too great A1 special case: accept for 1 mark might jam/catch hand between drawers [Total: 7]

Page 4 Mark Scheme Syllabus Paper IGCSE – May/June 2013 0625 22 © Cambridge International Examinations 2013 3 (a) ruler vertical OR ruler close B1 accept use a ruler EITHER measure length before and after OR note position of bottom before and after M1 Subtract A1 OR put ruler zero at bottom of spring M1 note reading of bottom after load applied A1 (b) (i) 58 and 297 (both) B1 (ii) (ignore (0, 0) not plotted) 6 points correctly plotted ± half small square –1 e.e.o.o. B2 (iii) 249 (mm) OR 239 (mm) OR 2 (N) OR 49 (mm) B1 (iv) good straight line through points and (0, 0) B1 (v) doubles B1 directly proportional B1 NOT inversely/indirectly proportional [Total: 10] 4 (a) liquid/alcohol/mercury/reading (level) rises/increases/moves along the tube/expands B1 ignore temperature increases (b) liquid expands OR liquid molecules get further apart B1 (c) arrow indicating 100 °C by eye B1 (d) idea of large movement of thread (for small temperature change) B1 accept it increases sensitivity o.w.t.t.e. [Total: 4]

Page 5 Mark Scheme Syllabus Paper IGCSE – May/June 2013 0625 22 © Cambridge International Examinations 2013 5 (a) liquid, condone named liquid gas, condone named gas solid any 1 correct B1 other 2 correct B1 (b) (i) melting/fusion B1 (ii) condensation B1 (iii) evaporation OR boiling B1 [Total: 5] 6 (a) correct idea of focal length C1 focal length accurately shown ± 1 mm A1 (b) (i) ray from top of object parallel to axis as far as lens, then down through F1 (ignore point of refraction, as long as somewhere on lens) OR M1 ray from top of object, straight through centre of lens (NOTE: ray need not intersect printed one to score M1) image drawn perpendicularly between intersection of candidate’s rays and axis A1 (ii) diminished o.w.t.t.e. B1 inverted (ignore laterally) OR upside down B1 ignore brightness, ignore direction is changed, accept direction is reversed [Total: 6]

Page 6 Mark Scheme Syllabus Paper IGCSE – May/June 2013 0625 22 © Cambridge International Examinations 2013 7 (a) ignore any additions for lamp A for C allow B1 only for ✓ ✓ ✓ (b) all of them OR A, B and C B1 (c) (switch) 1 B1 [Total: 5] 8 (a) (i) charge OR charged particles OR electrons B1 (ii) p.d./cell/battery/e.m.f. across it OR move in a magnetic field OR connect to positive AND negative of power supply B1 ignore connect to a battery (iii) A OR amp(s) OR ampere(s) B1 (b) (i) R1 + R2 OR 8 + 4 C1 12 Ω A1 (ii) V = IR in any form OR V/R C1 6 / 12 C1 0.5 A A1 (iii) 1. decreases, ignore numbers B1 2. decreases, ignore numbers B1 [Total: 10] lamp that is lit switches closed 1 2 3 4 5 lamp A only ✓ ✓ ✓ lamp B only ✓ ✓ ✓ lamp C only ✓ ✓ B1 B2

Page 7 Mark Scheme Syllabus Paper IGCSE – May/June 2013 0625 22 © Cambridge International Examinations 2013 9 (a) (i) copper B1 (ii) iron, accept (silicon) steel B1 (b) V1 / V2 = N1 / N2 in any form C1 correct substitution e.g. 240 / 6 = 800 / N2 C1 20 A1 (c) (i) idea that they would blow/burn out B1 accept blow up (ii) 2 or more lamps in parallel across AB and none in series B1 [Total: 7] 10 (a) (i) basic pattern correct, three lines C1 basic pattern correct, five lines or more A1 no lines meeting or crossing, even at magnet ends B1 (ii) direction arrow correct (condone more than one unless any of them wrong) B1 (b) (i) basic pattern correct outside coil, four lines or more B1 lines present and continuous and not touching within core B1 (ii) iron / steel B1 ignore magnet/magnetic metal (iii) solenoid B1 [Total: 8]

Page 8 Mark Scheme Syllabus Paper IGCSE – May/June 2013 0625 22 © Cambridge International Examinations 2013 11 (a) gamma OR γ beta OR β alpha OR α any 1 correct B1 other 2 correct B1 (b) 2nd statement ticked B1 (c) (i) 24 (s) ± 0.5 B1 (ii) 2 B1 (iii) candidate’s (i) ÷ candidate’s (ii), correctly evaluated B1 (24 ÷ 2 = 12 (s)) [Total: 6] 12 (a) (i) electron B1 (ii) proton and neutron (both, either order) B1 (b) (i) (number of) protons accept proton number B1 NOT no. of protons and electrons (ii) neutron(s) B1 (iii) 1. 17, accept 2, 8, 7 B1 1 2. 17, accept 2, 8, 7 B1 2 [Total: 6]