Cambridge IGCSE Physics 0625 — 2010 Oct/Nov Paper 2 · Variant 2

This document consists of 17 printed pages and 3 blank pages. DC (NF/SW) 24987/3 © UCLES 2010 [Turn over UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education * 9 3 4 9 4 7 9 7 2 0 * PHYSICS 0625/22 Paper 2 Core October/November 2010 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 soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. 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/O/N/10 © UCLES 2010 1 Drops of water from a cracked gutter fall past the window of an IGCSE Physics student’s room, as shown in Fig. 1.1. cracked gutter Fig. 1.1 The student uses a digital stopwatch to find the time between one drop and the next. To do this he sets the stopwatch to zero, then, starts the stopwatch as a drop comes into view at the top of the window, then, stops the stopwatch 40 drops later. The appearance of the stopwatch after 40 drops is shown in Fig. 1.2. s Fig. 1.2 (a) State the reading on the stopwatch. reading = … s [1]

3 0625/22/O/N/10 © UCLES 2010 [Turn over (b) Calculate the time interval between one drop and the next. time = … s [2] (c) Explain why it is better to time 40 intervals than to time just 1 interval. … … [1] (d) Using Fig. 1.1, estimate the time for a drop to fall from the top of the upper window to the ground. time = … s [3] (e) Fig. 1.1 shows that the drops get further apart as they get closer to the ground. Explain why this happens. … … … [1] [Total: 8]

4 0625/22/O/N/10 © UCLES 2010 2 An unstretched spring of overall length 50.0 mm is hung from a support, as shown in Fig. 2.1. 50.0 mm load Fig. 2.1 Different loads are placed on the spring and the extension is measured each time. (a) On Fig. 2.1, mark clearly the extension caused by the load. [1] (b) The extensions for different loads are given in the table below. load / N extension / mm 0 1.0 2.0 3.0 4.0 0 10.0 20.5 31.0 41.5 (i) On Fig. 2.2, plot these values, using dots in small circles (), and draw the best straight line for the points. [3]

5 0625/22/O/N/10 © UCLES 2010 [Turn over 0 0 10 20 30 40 50 60 1 2 3 4 5 extension / mm load / N Fig. 2.2 (ii) Complete the following sentence by inserting the appropriate word. Within the limits of experimental accuracy, the load and the extension of the spring are … to each other. [1] (iii) A load of 2.5 N is hung on the spring. 1. What does the letter N stand for? … [1] 2. Use the graph to estimate the overall length of the spring when 2.5 N is hanging from it. length = … mm [2] [Total: 8]

6 0625/22/O/N/10 © UCLES 2010 3 (a) An aeroplane is flying horizontally at a steady speed in a straight line. Fig. 3.1 shows three of the four forces acting on it. air friction weight engine thrust Fig. 3.1 (i) In order to fly horizontally at a steady speed, which two of the forces shown on the aeroplane must be equal? … and … are equal. [1] (ii) In order to fly horizontally in a straight line, there must be a fourth force acting on the plane. Draw an arrow on Fig. 3.1 to represent this force. [1] (b) The aeroplane in Fig. 3.1 flies an outward journey from Budapest (Hungary) to Palermo (Italy) in 2.75 hours. The distance is 2200 km. (i) Calculate, in km / h, the average speed of the aeroplane. average speed = … km / h [3] (ii) On the return journey from Palermo to Budapest, the journey time is shorter, even though the engine thrust is the same. Suggest what might have caused the return journey to be shorter. … … [1] [Total: 6]

7 0625/22/O/N/10 © UCLES 2010 [Turn over 4 A simple pendulum starts with its bob at position X, shown in Fig. 4.1. The bob is pulled aside to Y and then released. It swings from Y to Z and back to Y. support pendulum bob ground Y X Z thin cord Fig. 4.1 Write suitable words in the gaps in the following sentences. Ignore air resistance. In order to move the bob from X to Y, … has to be done on it and its … energy increases because it is raised further from the ground. As it moves towards X, some of this energy is converted into … energy. Throughout the swing from Y to Z and back to Y, the total energy is … . Energy is measured in units called … . [5] [Total: 5]

8 0625/22/O/N/10 © UCLES 2010 5 (a) The list below contains terms that are used when dealing with heat and temperature. boiling point, melting point, internal energy, thermal capacity (i) Which one of these quantities will increase when an object is heated? … [1] (ii) Which one of these determines the temperature rise when an object is given a quantity of energy, without changing state? … [1] (iii) Some liquid is heated until its temperature stops rising. Which one of these quantities describes the temperature at which this happens? … [1] (b) Fig. 5.1 shows an apparatus containing a brass rod. The brass rod is inside a tube, called a steam jacket, through which steam may be passed. The rod is fixed at the right-hand end, but free to move at the left-hand end. The dial micrometer indicates any movement of the left hand end. thermometer steam in steam out rigid frame fixed end dial micrometer steam jacket brass rod Fig. 5.1 Steam is now passed through the steam jacket. In the boxes below, write down what will happen to the readings on the thermometer and the dial micrometer, and why. what will happen why reading on thermometer reading on dial micrometer [4] [Total: 7]

9 0625/22/O/N/10 © UCLES 2010 [Turn over 6 (a) Fig. 6.1 shows a ray of light AB striking a plane mirror at an angle of incidence of 40°. 40° A C B mirror Fig. 6.1 State the value of the angle of reflection of the ray … [1] (b) In Fig. 6.2, the mirror has been rotated 10° from its position in Fig. 6.1. AB has remained unchanged. 40° 10° A C B mirror Fig. 6.2 (i) On Fig. 6.2, use a straight edge to draw the reflected ray. (ii) State the value of the angle between the reflected ray and the line BC. … (iii) Through how many degrees does the reflected ray rotate when the mirror rotates through 10°? … [4] (c) An object of height 2 cm is placed 5 cm in front of a plane mirror. (i) State the height of the image formed by the mirror. … [1] (ii) Find the distance between the object and the image. distance = … cm [2] [Total: 8]

10 0625/22/O/N/10 © UCLES 2010 7 A narrow beam of white light enters a glass prism and is split into the colours of the visible spectrum, as shown (not to scale) in Fig. 7.1. space for answers to part (b) narrow beam of white light Fig. 7.1 (a) What name do we give to (i) the bending of the light as it enters the prism, … (ii) the different amounts of bending that give rise to the spectrum? … [2] (b) The lines leaving the prism represent rays of the seven main colours of the visible spectrum. In the answer spaces provided on Fig. 7.1, write (i) ‘red’ in the space alongside the red ray, (ii) ‘yellow’ in the space alongside the yellow ray. [2] (c) The visible spectrum is part of the electromagnetic spectrum. State two other types of radiation that are also part of the electromagnetic spectrum. 1. … 2. … [2] [Total: 6]

11 0625/22/O/N/10 © UCLES 2010 [Turn over 8 A stretched string is vibrating between two fixed ends. Fig. 8.1 shows how the string is vibrating. b a Fig. 8.1 (a) State the name of (i) distance a, … [1] (ii) distance b. … [1] (b) The string is causing a sound to be transmitted through the air. (i) Describe how the string causes the sound. … … … … … [2] (ii) State what happens to the sound as the distance a decreases. … … [1] [Total: 5]

12 0625/22/O/N/10 © UCLES 2010 9 (a) (i) In the space below, draw a diagram of the circuit that you would use to determine the resistance of a coil of wire using a voltmeter and an ammeter. Use conventional symbols and label the coil clearly. [3] (ii) State the equation you would use to calculate the resistance of the coil. [1] (iii) State two properties of the wire on which the resistance of the coil depends. 1. … 2. … [2] (b) In Fig. 9.1, AB is a 2.0 m length of uniform resistance wire, connected into a circuit. Ignore the resistance of the battery. I A B 3.0 6.0 V Fig. 9.1

13 0625/22/O/N/10 © UCLES 2010 [Turn over The current I is 1.5 A. Calculate the resistance per metre of the resistance wire. resistance per metre = … Ω / m [4] [Total: 10]

14 0625/22/O/N/10 © UCLES 2010 10 (a) The apparatus in Fig. 10.1 is set up in a laboratory. The metal wheels are rolled along the rails from the left-hand end to the right-hand end. metal wheels on metal axle metal rails sensitive centre-zero millivoltmeter Fig. 10.1 (i) Describe what is seen happening to the pointer on the sensitive centre-zero millivoltmeter. … … [2] (ii) Explain why this happens. … … … … … [3] (iii) The metal wheels are now rolled back to the left-hand end again. Describe what now happens to the millivoltmeter pointer. … … [1]

15 0625/22/O/N/10 © UCLES 2010 [Turn over (b) Fig. 10.2 shows a magnet suspended above a coil of wire. sensitive centre-zero millivoltmeter magnet coil spring Fig. 10.2 The end of the magnet is pushed into the coil and released, so that it bounces repeatedly in and out of the coil. Describe what is seen on the sensitive centre-zero millivoltmeter. … … [1] [Total: 7]

16 0625/22/O/N/10 © UCLES 2010 11 (a) In the space below, draw the circuit symbol for a fuse. [1] (b) Describe how a fuse protects an electric circuit. … … … … [2] (c) A mains electricity circuit has three wires, live, neutral and earth. In which of these is the fuse connected? Tick one box. live neutral earth [1] [Total: 4]

17 0625/22/O/N/10 © UCLES 2010 12 (a) A β-particle may be represented by the symbol 0 –1e. (i) What does the e indicate about a β-particle? … (ii) What does the 0 indicate about a β-particle? … (iii) What does the –1 indicate about a β-particle? … [4] (b) The nuclide 250 97Bk decays by emitting a β-particle. Complete the nuclear equation for this decay by writing appropriate numbers in the boxes. 250 97Bk Cf + 0 –1e [2] [Total: 6]

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20 0625/22/O/N/10 © UCLES 2010 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. BLANK PAGE

UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education MARK SCHEME for the October/November 2010 question paper for the guidance of teachers 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 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 2010 question papers for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses. www.XtremePapers.com

Page 2 Mark Scheme: Teachers’ version Syllabus Paper IGCSE – October/November 2010 0625 22 © UCLES 2010 NOTES ABOUT MARK SCHEME SYMBOLS & OTHER MATTERS 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. un.pen. means "unit penalty". An otherwise correct answer will have one mark deducted if the unit is wrong or missing. This only applies where specifically stated in the mark scheme. Elsewhere, incorrect or missing units are condoned. 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 Answers are acceptable to any number of significant figures ≥ 2, except if specified figures otherwise, or if only 1 sig. fig. is appropriate. Units Ignore units, except where a mark is specified for a particular unit. 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 Work which has been crossed out, but not replaced, should be marked as if it had not been crossed out.

Page 3 Mark Scheme: Teachers’ version Syllabus Paper IGCSE – October/November 2010 0625 22 © UCLES 2010 1 (a) 13.6 (s) B1 (b) 13.6/40 e.c.f. C1 0.34 (s) e.c.f. A1 (c) more accurate OR errors less significant OR time for 1 interval too small B1 (d) 4 intervals OR 4 and a bit intervals OR 5 intervals C1 4 × his (b) OR (4 and a bit) × his (b) 5 × his (b) C1 1.36 – 1.5 (s) e.c.f. A1 (e) drops accelerate/go faster B1 [Total: 8] 2 (a) extension indicated between two broken lines B1 (b) (i) 4 points correctly plotted ± ½ small square –1 e.e.o.o. B2 (condone 0,0 not plotted) straight line through points and origin, by eye B1 (ii) proportional B1 (iii) 1. newton(s) B1 2. 25 – 26 (mm) C1 75 – 76 (mm) A1 [Total: 8] 3 (a) (i) (engine) thrust and (air) friction B1 (ii) force shown vertically upwards, anywhere on plane B1 (b) (i) v = s/t in any form C1 2200/2.75 C1 800 (km/h) A1 (ii) idea of headwind on outward journey OR tailwind on return journey OR shorter route on return journey OR air friction is less OR idea of less weight NOT flies slower B1 [Total: 6]

Page 4 Mark Scheme: Teachers’ version Syllabus Paper IGCSE – October/November 2010 0625 22 © UCLES 2010 4 work B1 potential/gravitational/PE/GPE/position B1 kinetic/KE/movement B1 constant/the same/uniform B1 joule(s) OR J condone j B1 [Total: 5] 5 (a) (i) internal energy B1 (ii) thermal capacity B1 (iii) boiling point B1 (b) increases temperature rises OR mercury/alcohol/liquid expands B1 + B1 changes rod/brass expands B1 + B1 [Total: 7] 6 (a) 40 condone no unit B1 (b) (i) ray reflected at angle > 40° to dotted line B1 (ii) 60 condone no unit B1 (iii) his (ii) – 40 C1 20 e.c.f. condone no unit A1 (c) (i) 2 (cm) B1 (ii) idea of distance behind = distance in front C1 10 (cm) A1 [Total: 8] 7 (a) (i) refraction B1 (ii) dispersion B1 (b) red B1 yellow e.c.f. from red B1

Page 5 Mark Scheme: Teachers’ version Syllabus Paper IGCSE – October/November 2010 0625 22 © UCLES 2010 (c) any two from gamma, cosmic, X-rays, UV, IR, microwaves, radio, TV (ignore extras, unless wrong, in which case ✓ +  = 0) B1 + B1 [Total: 6] 8 (a) (i) amplitude B1 (ii) wavelength B1 (b) (i) string moves air M1 backwards & forwards OR up & down OR compressions & rarefactions A1 (ii) gets quieter/softer/less loud B1 [Total: 5] 9 (a) (i) (accept any recognisable symbols for M1 and A1 marks) battery/cell, ammeter, coil in series (ignore any switch or rheostat) M1 voltmeter clearly in parallel with coil A1 standard symbols used for battery/cell, voltmeter and ammeter B1 (ii) R = V/I in any form B1 (iii) length (of wire) ) diameter/cross-section/area (of wire) ) any 2 B1 + B1 resistivity/type of material ) temperature ) (b) EITHER 6/1.5 C1 (circuit res. =) 4 (Ω) C1 (res. of AB =) 1 (Ω) e.c.f. C1 0.5 (Ω/m) e.c.f. A1 OR p.d. across 3Ω = 4.5 (V) C1 p.d. across AB = 1.5 (V) C1 res. of AB = 1 (Ω) e.c.f. C1 0.5 (Ω/m) e.c.f. A1 [Total: 10]

Page 6 Mark Scheme: Teachers’ version Syllabus Paper IGCSE – October/November 2010 0625 22 © UCLES 2010 10 (a) (i) deflects NOT vibrates OR oscillates M1 returns to zero/centre again A1 (ii) induction/induced current or emf B1 axle/wire cuts magnetic field B1 not when axle out of field B1 (iii) opposite deflection B1 (b) needle/pointer swings from side to side B1 [Total: 7] 11 (a) condone OR B1 (b) current too large B1 fuse wire melts B1 (c) live ticked B1 [Total: 4] 12 (a) (i) it is an electron B1 (ii) no/negligible mass/weight allow “its mass” OR not one of nuclear particles B1 (iii) negative charge allow “its charge” M1 one unit of A1 (b) 250 B1 98 B1 [Total: 6]