UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education

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1 UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education * * PHYSICS 0625/02 Paper 2 Core October/November 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/s 2 ). 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 Total This document consists of 16 printed pages. SP (NF/CGW) T41976/4 UCLES 2008 [Turn over

2 2 1 A boy is fishing in a river. Nearby, a ferry-boat is taking passengers backwards and forwards across the river Fig. 1.1 Fig. 1.2 When he starts fishing one morning, the boy s wristwatch is as shown in Fig When he finishes his morning s fishing, the wristwatch is as shown in Fig (a) how many minutes was the boy fishing? number of minutes =... [3] (b) It takes the ferry-boat 20 minutes to load up passengers, take them across the river, load up with passengers at the other side, and return, to start all over again. Calculate how many journeys, across the river and back, the ferry made whilst the boy was fishing. number of journeys =... [2] [Total: 5] UCLES /02/O/N/08

3 3 2 The tank in Fig. 2.1 measures 2.0 m 1.5 m 1.0 m. It is full of water. water Fig. 2.1 (a) Calculate the volume of the tank. volume =... [3] (b) Water has a density of 1000 kg/m 3. Calculate the mass of water in the tank. mass =... [3] [Total: 6] UCLES /02/O/N/08 [Turn over

4 4 3 A spring is hung from a beam, and a load is suspended from it. Fig. 3.1 shows the spring before and after suspending the load. before W X after Y Z load Fig. 3.1 (a) Using the letters on Fig. 3.1, state which distance you would need to measure in order to find the extension of the spring. distance =... [1] (b) An experimenter measures the extension of the spring with different loads, and obtains the graph shown in Fig extension / cm load / N 5 Fig. 3.2 (i) When the experimenter hangs an unknown load on the spring, the extension of the spring is 1.7 cm. Fig. 3.2 to find the weight of the unknown load. weight =... N [1] UCLES /02/O/N/08

5 (ii) (iii) (iv) 5 State the value of the tension in the spring when this load is hanging from it. The load is pulled down further. State what happens to the tension in the spring. tension =... [2]... [1] After being pulled down, the load is released. State what happens to the load immediately after it is released [1] [Total: 6] UCLES /02/O/N/08 [Turn over

6 6 4 Fig. 4.1 represents the regions of the electromagnetic spectrum, with an enlargement of the visible light part of the spectrum. microwaves infra -red visible X-rays γ -rays visible M N Fig. 4.1 (a) Two of the regions have not been named in Fig In the two boxes below the spectrum, write the names of these regions. [2] (b) Write long wavelength next to the long wavelength end of the electromagnetic spectrum. [1] (c) State one use for the radiation of each of the following regions. microwaves... infra-red... γ-rays... [3] (d) State the colour you would expect to find (i) at end M of the visible spectrum,... (ii) at end N of the visible spectrum.... [2] [Total: 8] UCLES /02/O/N/08

7 7 5 (a) Make the following sentences about sound echoes correct by crossing out the incorrect alternatives. An example has been given to help you. large (example) An echo is caused when a sound wave hits a small obstacle. thin reflected (i) An echo is a sound wave which is refracted by an obstacle. [1] dispersed (ii) An echo from a stationary obstacle has a greater frequency than the same frequency as a smaller frequency than the sound hitting the obstacle. [1] (b) Two students, A and B, are trying to use echoes to enable them to measure the speed of sound. Student A has two blocks of wood that make a loud sound when banged together. Student B has a stopwatch. They stand 240 m from the school wall, as shown in Fig school wall B A 240 m Fig. 5.1 Student A bangs the blocks together and, at the same time, B starts the stopwatch. B stops the stopwatch when he hears the echo. The watch then reads 1.6 s. (i) How far did the sound travel during the 1.6 s?... m [1] (ii) Calculate the speed of sound. speed of sound =... m/s [3] UCLES /02/O/N/08 [Turn over

8 (iii) 8 The students expected that the value for the speed of sound would be closer to 330 m/s. Suggest two reasons that might explain why the students value was different from what was expected [2] [Total: 8] 6 Fig. 6.1 shows two mercury barometers standing side by side. The right-hand diagram is incomplete. The space labelled X is a vacuum. glass tube X mercury dish Fig. 6.1 (a) On the left-hand barometer, carefully mark the distance that would have to be measured in order to find the value of the atmospheric pressure. [2] (b) A small quantity of air is introduced into X. (i) State what happens to the mercury level in the tube.... [1] (ii) In terms of the behaviour of the air molecules, explain your answer to (b)(i). UCLES [2] (c) The space above the mercury in the right-hand barometer is a vacuum. On Fig. 6.1, mark the level of the mercury surface in the tube. [1] 0625/02/O/N/08

9 9 (d) The left-hand tube now has air above the mercury; the right-hand tube has a vacuum. Complete the table below, using words chosen from the following list, to indicate the effect of changing the external conditions. rises falls stays the same change atmospheric pressure rises effect on the level of the mercury in the left-hand tube effect on the level of the mercury in the right-hand tube temperature rises [4] [Total: 10] 7 This question requires the use of a ruler or other straight edge. Fig. 7.1 shows a ray of light striking a plane mirror. ray of light (a) On Fig. 7.1, A Fig. 7.1 mirror (i) draw the normal to the mirror at A, [1] (ii) draw the path of the reflected ray, [1] (iii) mark and label the angle of incidence, i, [1] (iv) mark and label the angle of reflection, r. [1] (b) State the equation that links i and r.... [1] (c) On Fig. 7.1 (i) draw another mirror which is perpendicular to the one in the diagram and 2 cm to the right of A, [1] (ii) draw the path of the ray of light after reflection from this second mirror. [1] UCLES /02/O/N/08 [Total: 7] [Turn over

10 10 8 (a) An iron rod is placed next to a bar magnet, as shown in Fig N S iron rod Fig. 8.1 (i) (ii) On Fig. 8.1, mark clearly the north pole and the south pole that are induced in the iron rod. [1] What happens to the magnet and the rod? Tick one box. nothing they attract they repel [1] (b) A second bar magnet is now placed next to the iron rod, as shown in Fig N S iron rod N S Fig. 8.2 (i) On Fig. 8.2, mark clearly the magnetic poles induced in the iron rod. [1] (ii) What happens to the iron rod and the second magnet? Tick one box. nothing they attract they repel [1] (c) The iron rod is removed, leaving the two magnets, as shown in Fig N S N S Fig. 8.3 What happens to the two magnets? Tick one box. nothing they attract they repel [1] UCLES /02/O/N/08

11 11 (d) The second magnet is removed and replaced by a charged plastic rod, as shown in Fig N S + charged plastic rod Fig. 8.4 What happens to the magnet and the plastic rod? Tick one box. nothing they attract they repel [1] [Total: 6] UCLES /02/O/N/08 [Turn over

12 12 9 A toymaker wires a circuit in a toy house, so that a 6 V lamp can be switched on using either switch 1 at the bottom of the stairs or switch 2 at the top of the stairs. The circuit is shown in Fig X Y 6 V lamp switch 2 a b 6 V supply switch 1 A B Fig. 9.1 (a) When switch 1 is in position A, what is the position of switch 2 so that the lamp is lit?... [1] (b) When switch 2 is in position b, what is the position of switch 1 so that the lamp is lit?... [1] (c) The lamp has a resistance of 4.0 Ω. Calculate the current in the circuit. current =... [4] UCLES /02/O/N/08

13 13 (d) The toymaker decides he wants to have two 6 V lamps in the circuit with the 6 V supply. Which of the following means of connecting the lamps between X and Y, shown in Fig. 9.2, is the best? Give two reasons for your answer. X Y X Y connection 1 connection 2 Fig. 9.2 Which is best?... Reason 1... Reason 2... [3] [Total: 9] UCLES /02/O/N/08 [Turn over

14 14 10 The circuit in Fig shows an electromagnetic relay being used to switch an electric motor on and off. The relay coil has a much greater resistance than the potential divider. 6 V pivoted iron armature power supply for motor switch M motor relay core contacts Fig (a) The relay operates when there is a potential difference of 3 V across the coil. On Fig. 10.1, mark the position of the slider of the potential divider when the relay just operates. [1] (b) Describe how the relay closes the contacts in the motor circuit [3] [Total: 4] UCLES /02/O/N/08

15 15 11 Fig shows a transformer being used to operate a 6 V lamp from a 240 V mains supply. A 240V mains 6 V lamp B 8000 turns iron Fig (a) What name is given to the piece of iron that links the two coils?... [1] (b) the transformer to operate, must the mains supply be a.c., d.c., or doesn t it matter?... [1] (c) Using the information on Fig. 11.1, calculate the number of turns on the secondary coil. number of turns =... [3] (d) State why it would not be wise to connect a 1.5 V lamp between A and B.... [1] [Total: 6] UCLES /02/O/N/08 [Turn over

16 16 12 The nucleus of one of the different nuclides of polonium can be represented by the symbol Po (a) State the proton number of this nuclide.... [1] (b) State the nucleon number of this nuclide.... [1] (c) The nucleus decays according to the following equation Po Pb + emitted particle (i) State the proton number of the emitted particle.... [1] (ii) State the nucleon number of the emitted particle.... [1] (iii) Name the emitted particle. Tick one box. α-particle β-particle neutron proton [1] [Total: 5] 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. UCLES /02/O/N/08

17 UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education * * PHYSICS 0625/02 Paper 2 Core October/November 2007 Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST 1 hour 15 minutes 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/s 2 ). 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 Total This document consists of 16 printed pages. SP (MML /06) T25940/5 UCLES 2007 [Turn over

18 1 Fig. 1.1 shows some liquid in a measuring cylinder. The metal can next to it has a crosssectional area which is four times that of the measuring cylinder. 2 cm 3 measuring cylinder liquid metal can Fig. 1.1 (a) State the volume of the liquid. volume =... cm 3 [1] (b) The liquid is poured into the metal can. On Fig. 1.1, draw the surface of the liquid in the can. [2] (c) Complete the following sentence. The pressure of the water at the bottom of the can is than the pressure that the water had at the bottom of the measuring cylinder. [1] [Total: 4] UCLES /02/O/N/07

19 2 A theatre measures 100 m 80 m 25 m. The air inside it has a density of 1.3 kg / m 3 when it is cool. 3 (a) Calculate the volume of the air in the theatre. volume of air =... m 3 [1] (b) Calculate the mass of the air. State the equation you are using. mass of air =... [4] (c) Some time after the doors are opened, the heating in the theatre is switched on. State and explain what happens to the mass of the air in the theatre as it warms up. statement explanation [2] (d) Suggest why the temperature of the air in the balcony of the theatre (nearer the ceiling) is likely to be greater than that lower down in the theatre.... [1] [Total: 8] UCLES /02/O/N/07 [Turn over

20 3 Fig. 3.1 shows a simple mercury barometer, drawn 1/10 full size. 4 glass tube mercury reservoir Fig. 3.1 (a) On Fig. 3.1, use your rule to make an appropriate measurement, and then use it to calculate the atmospheric pressure. atmospheric pressure =... cm Hg [2] (b) State what occupies the space in the tube above the mercury [1] UCLES /02/O/N/07

21 5 (c) On another occasion, the atmospheric pressure is much less than that shown in Fig On Fig. 3.1, mark where the mercury surfaces in the tube and in the reservoir might be. [2] (d) The tube above the mercury gets broken and allows air to move in to and out of the tube. Explain why the barometer no longer functions [2] [Total: 7] UCLES /02/O/N/07 [Turn over

22 4 A diesel engine is used to drag a boat up a slipway (see Fig. 4.1). 6 diesel engine s slipway h Fig. 4.1 The boat finishes in the position shown by the broken outline. (a) On Fig. 4.1, carefully mark (i) the weight W of the boat, using an arrow labelled W, [1] (ii) the friction force F on the boat, using an arrow labelled F. [1] (b) State, in terms of W, F, h and s, how you could calculate (i) the work done lifting the weight of the boat, [1] (ii) the work done against the friction force, [1] (iii) the total work done pulling the boat up the slipway.... [1] (c) What other measurement would you need to make if you wanted to calculate the useful power output of the diesel engine?... [1] [Total: 6] UCLES /02/O/N/07

23 5 Fig. 5.1 shows a liquid-in-glass thermometer. 7 capillary tube liquid Fig. 5.1 (a) The thermometer is used for measuring temperatures in school laboratory experiments. State the units in which the temperatures are measured.... [1] (b) On Fig. 5.1, mark where the liquid thread will reach when the thermometer is placed in (i) pure melting ice (label this point ICE), [1] (ii) steam above boiling water (label this point STEAM). [1] (c) A liquid-in-glass thermometer makes use of the expansion of a liquid to measure temperature. Other thermometers make use of other properties that vary with temperature. In the table below, write in two properties, other than expansion of a liquid, that can be used to measure temperature. example expansion OF a liquid 1. OF 2. OF [2] [Total: 5] UCLES /02/O/N/07 [Turn over

24 6 A motorcyclist drives along a straight road. Fig. 6.1 gives information about the first 10 s of his ride. 8 start 0 m / s after 5 s 9 m / s after 10 s 18 m / s Fig. 6.1 (a) From the information on Fig. 6.1, (i) describe the motion of the motorcyclist by ticking one of the following boxes, constant speed uniform acceleration uniform deceleration [1] (ii) estimate the average speed of the motorcyclist during the 10 s, (iii) calculate the distance travelled during the 10 s. average speed =... m / s [1] distance travelled =... m [2] (b) State why the distance travelled in the first 5 s is less than half of the distance travelled in the first 10 s of the journey [1] [Total: 5] UCLES /02/O/N/07

25 7 A girl drops a small stone from a bridge into a pond. 9 X Fig. 7.1 (a) The stone hits the water surface at point X. Fig. 7.2, which is drawn full-size, shows the wavefront a fraction of a second after the stone hits the water. (i) The wave travels at 5 cm / s. Calculate how far the wave travels in 0.3 s. distance travelled =... cm [1] (ii) On Fig. 7.2, draw the position of the wavefront 0.3 s after that already shown. [2] X Fig. 7.2 (b) A ringing bell also sends out waves in all directions. State two ways in which these waves are different from the waves in part (a), other than the fact that one is created in air and the other in water [2] UCLES /02/O/N/07 [Total: 5] [Turn over

26 8 An object OX is placed in front of a converging lens. The lens forms an image IY. 10 Fig. 8.1 shows two rays from the object to the image. X O I Y Fig. 8.1 (a) On Fig. 8.1, (i) clearly mark and label the principal focus and the focal length of the lens, [3] (ii) draw a third ray from X to Y. [1] UCLES /02/O/N/07

27 (b) The following list contains descriptions that can be applied to images. 11 Tick any which apply to the image shown in Fig real virtual enlarged diminished inverted upright image distance less than object distance image distance more than object distance [4] (c) State two things that happen to the image in Fig. 8.1 when the object is moved further away from the lens [2] [Total: 10] UCLES /02/O/N/07 [Turn over

28 9 A thermistor connected to a variable voltage supply is immersed in a beaker of water. 12 The beaker of water is heated slowly, using a Bunsen burner, as shown in Fig variable voltage supply A V thermometer water Bunsen burner Fig. 9.1 At different temperatures, the voltage is adjusted until the current is 25 ma and the value of the voltage is noted. The results are shown below. temperature / C voltage / V (a) On the axes of Fig. 9.2, shown on page 13, plot a graph of voltage against temperature. [4] UCLES /02/O/N/07

29 voltage / V Fig. 9.2 temperature / o C (b) From the graph, find the voltage needed to give a current of 25 ma (i) at 40 C, voltage needed =... V [1] (ii) at 80 C. voltage needed =... V [1] (c) your results in (b) to calculate the resistance of the thermistor (i) at 40 C, resistance at 40 C =... (ii) at 80 C. resistance at 80 C =... [5] (d) your results in (c) to complete the following sentence about thermistors of the sort used in this experiment. The thermistor in this experiment is a device whose resistance as the temperature increases. [1] [Total: 12] UCLES /02/O/N/07 [Turn over

30 10 A coil of insulated wire is connected in series with a battery, a resistor and a switch. 14 Fig (a) The switch is closed and the current in the coil creates a magnetic field. (i) (ii) On Fig. 10.1, draw the shape of the magnetic field, both inside and outside the coil. [4] A glass bar, an iron bar and a perspex bar are placed in turn inside the coil. Which one makes the field stronger?... [1] (b) Two thin iron rods are placed inside the coil as shown in Fig The switch is then closed. Fig The iron rods move apart. Suggest why this happens [3] [Total: 8] UCLES /02/O/N/07

31 11 The activity of a sample of radioactive material is determined every 10 minutes for an hour. The results are shown in the table. 15 time / minutes activity count / s (a) From the figures in the table, estimate the half-life of the radioactive material. half-life =... minutes [1] (b) A second experiment is carried out with another sample of the same material. At the start of the experiment, this sample has twice the number of atoms as the first sample. Suggest what values might be obtained for (i) the activity at the start of the second experiment,... count / s [1] (ii) the half-life of the material in the second experiment.... minutes [1] (c) Name one type of particle that the material might be emitting in order to cause this activity.... [1] [Total: 4] UCLES /02/O/N/07 [Turn over

32 12 A beam of cathode rays is travelling in a direction perpendicularly out of the page. The beam is surrounded by four metal plates P 1, P 2, P 3 and P 4 as shown in Fig On Fig. 12.1, the beam is shown as the dot at the centre. P 2 P 1 P 3 P 4 Q Fig (a) Cathode rays are produced by thermionic emission. What is the name of the particles which make up cathode rays?... [1] (b) A potential difference is applied between P 1 and P 3, with P 1 positive with respect to P 3. State what happens to the beam of cathode rays.... [2] (c) The potential difference in (b) is removed. Suggest how the beam of cathode rays can now be deflected down the page towards Q [2] (d) Cathode rays are invisible. State one way to detect them.... [1] [Total: 6] 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. UCLES /02/O/N/07

33 Centre Number Candidate Number Name UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education PHYSICS 0625/02 Paper 2 Core Candidates answer on the Question Paper. No Additional Materials are required. October/November hour 15 minutes 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. 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/s 2 ). 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. This document consists of 15 printed pages and 1 blank page. MML /05 S99316/2 UCLES 2006 [Turn over

34 1 A worker on the production line in a factory is making brackets. An inspector times the worker whilst he makes 5 brackets. To start, the stopwatch is set to zero. After 5 brackets have been made, the stopwatch is as shown in Fig Examiner's Fig. 1.1 (a) State the reading on the stopwatch. reading =... s [1] (b) Calculate the time taken to make 1 bracket. time taken =... s [2] (c) The worker has a target of making 300 brackets per hour. Does the worker meet his target? Tick one box and show the working which led you to your answer. Does the worker meet his target? Yes No [4] UCLES /02/O/N/06

35 2 Some IGCSE students were asked to write statements about mass and weight. Their statements are printed below. Put a tick in the box alongside each of the two correct statements. Mass and weight are the same thing. 3 Examiner's Mass is measured in kilograms. Weight is a type of force. Weight is the acceleration caused by gravity. [2] UCLES /02/O/N/06 [Turn over

36 3 Fig. 3.1 shows the speed/time graph for a journey travelled by a tractor. 4 Examiner's speed m / s 6 Q R O P S time / s Fig. 3.1 (a) the graph to describe the motion of the tractor during each of the marked sections. OP... PQ... QR... RS... [4] (b) Which two points on the graph show when the tractor is stationary? point... and point... [1] (c) State the greatest speed reached by the tractor. greatest speed =... m/s [1] (d) how long was the tractor travelling at constant speed? at constant speed for... s [1] (e) State how the graph may be used to find the total distance travelled during the 200 s journey. Do not attempt a calculation.... [1] UCLES /02/O/N/06

37 4 (a) Name the process by which thermal energy is transferred 5 Examiner's (i) from the Sun to the Earth,... (ii) through the metal of a cooking pot.... [2] (b) A child is sitting on an oscillating swing, as shown in Fig At the top of the oscillation, the child and swing are momentarily at rest. Fig. 4.1 (i) the names of appropriate types of energy to complete the following word equation. Write on the lines in the boxes. gravitational potential energy at the top of the oscillation =... energy at the bottom of the oscillation +... energy at the bottom of the oscillation + energy losses (ii) The child continues to sit still on the swing. The amplitude of the oscillations slowly decreases. Explain why this happens [3] UCLES /02/O/N/06 [Turn over

38 5 (a) State the two factors on which the turning effect of a force depends. 6 Examiner's [2] (b) ces F 1 and F 2 are applied vertically downwards at the ends of a beam resting on a pivot P. The beam has weight W. The beam is shown in Fig F F P 1 W F 2 Fig. 5.1 (i) Complete the statements about the two requirements for the beam to be in equilibrium. 1. There must be no resultant There must be no resultant... (ii) The beam in Fig. 5.1 is in equilibrium. F is the force exerted on the beam by the pivot P. Complete the following equation about the forces on the beam. F =... (iii) Which one of the four forces on the beam does not exert a moment about P?... [4] UCLES /02/O/N/06

39 6 A woman stands so that she is 1.0 m from a mirror mounted on a wall, as shown in Fig Examiner's mirror 1.0 m Fig. 6.1 (a) (b) On Fig. 6.1, carefully draw (i) a clear dot to show the position of the image of her eye, (ii) the normal to the mirror at the bottom edge of the mirror, (iii) a ray from her toes to the bottom edge of the mirror and then reflected from the mirror. [5] Explain why the woman cannot see the reflection of her toes [1] (c) (i) How far is the woman from her image?... m (ii) How far must the woman walk, and in what direction, before the distance between her and her image is 6.0 m? distance walked =... m UCLES /02/O/N/06 direction =... [4] [Turn over

40 7 A man is using an axe to chop down a tree, as shown in Fig Examiner's Fig. 7.1 (a) A short time after the axe hits the tree, the man hears a clear echo. He estimates that the echo is heard 3 seconds after the axe hits the tree. (i) Suggest what type of obstacle might have caused such a clear echo.... (ii) The speed of sound in air is 320 m/s. Calculate the distance of the obstacle from the tree. obstacle distance =... m [4] UCLES /02/O/N/06

41 (b) 9 A branch from the tree falls into some shallow water in a pond nearby. The branch sets up a wave. The wave moves to the left a distance of 3.0 m before hitting the side of a moored boat and reflecting back again. Examiner's water wave B side of boat 3.0 m A Fig. 7.2 The wave takes 5.0 s to travel from AB to the boat and back to AB. Calculate the speed of the water-wave. speed of wave =... m/s [2] UCLES /02/O/N/06 [Turn over

42 8 (a) Fig. 8.1 shows two groups of materials. 10 Examiner's GROUP 1 copper gold iron aluminium GROUP 2 silk ebonite plastics glass Fig. 8.1 (i) Which group contains metals?... (ii) Which group contains insulators?... (iii) Write down the name of one of the eight materials above that may be charged by rubbing it with a suitable dry cloth.... [3] (b) Two charged metal balls are placed close to a positively-charged metal plate. One is attracted to the plate and one is repelled. attracted to plate charged plate repelled by plate Fig. 8.2 Write a + sign on the ball that is positively charged and a sign on the one that is negatively charged. [1] (c) State what is meant by an electric field [3] UCLES /02/O/N/06

43 9 The points plotted on the grid shown in Fig. 9.1 were obtained from a spring-stretching experiment. 11 Examiner's length / mm load / N Fig. 9.1 (a) (b) Using a straight edge, draw a straight line through the first 5 points. Extend your line to the edge of the grid. [1] Suggest a reason why the sixth point does not lie on the line you have drawn.... [1] (c) Calculate the extension caused by the 3 N load. extension =... mm [2] (d) A small object is hung on the unloaded spring, and the length of the spring becomes 62 mm. the graph to find the weight of the object. weight of object =... N [1] UCLES /02/O/N/06 [Turn over

44 12 Examiner's 10 A person has a 6 V bell. He hopes to operate the bell from a 240 V a.c. mains supply, with the help of the transformer shown in Fig V a.c. input output primary coil 5000 turns secondary coil 250 turns Fig (a) State how you can tell from Fig that the transformer is a step-down transformer.... [1] (b) State how the output voltage compares with the input voltage in a step-down transformer.... [1] (c) Calculate the output voltage of the transformer when connected to the 240 V mains supply. output voltage =... V [3] (d) Why would it not be wise for the person to connect the 6 V bell to this output? [1] UCLES /02/O/N/06

45 11 The table below contains some information about uranium Examiner's proton number Z = 92 nucleon number A = 238 decays by emitting α-particle (a) State how many electrons there are in a neutral atom of uranium [1] (b) State where in the atom the electrons are to be found.... [1] (c) State how many neutrons there are in an atom of uranium [1] (d) State where in the atom the neutrons are to be found.... [1] (e) State what happens to the number of protons in an atom of uranium-238 when an α-particle is emitted.... [2] UCLES /02/O/N/06 [Turn over

46 12 Fig shows an electric circuit. 14 Examiner's ammeter battery lamp 15 Ω resistor Fig (a) The lamp lights, but the ammeter needle moves the wrong way. What change should be made so that the ammeter works correctly?... [1] (b) What does an ammeter measure?... [1] (c) In the space below, draw a circuit diagram of the circuit in Fig. 12.1, using correct circuit symbols. [2] UCLES /02/O/N/06

47 (d) (i) Name the instrument that would be needed to measure the potential difference (p.d.) across the 15 Ω resistor Examiner's (ii) Using the correct symbol, add this instrument to your circuit diagram in (c), in a position to measure the p.d. across the 15 Ω resistor. [2] (e) The potential difference across the 15 Ω resistor is 6 V. Calculate the current in the resistor. current =... A [3] (f) Without any further calculation, state the value of the current in the lamp. lamp current =... A [1] (g) Another 15 Ω resistor is connected in parallel with the 15 Ω resistor that is already in the circuit. (i) What is the combined resistance of the two 15 Ω resistors in parallel? Tick one box. 30 Ω 15 Ω 7.5 Ω zero (ii) State what effect, if any, adding this extra resistor has on the current in the lamp.... [2] UCLES /02/O/N/06

48 16 BLANK PAGE 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 University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge. 0625/02/O/N/06

49 Centre Number Candidate Number Name UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education PHYSICS 0625/02 Paper 2 Core Candidates answer on the Question Paper. No Additional Materials are required. October/November hour 15 minutes 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 in the spaces provided on the Question Paper. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. Answer all questions. 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. 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/s 2 ). If you have been given a label, look at the details. If any details are incorrect or missing, please fill in your correct details in the space given at the top of this page. Stick your personal label here, if provided. This document consists of 15 printed pages and 1 blank page. MML /04 S80925/2 UCLES 2005 [Turn over

50 2 Examiner's 1 The length of a spring is measured when various loads from 1.0 N to 6.0 N are hanging from it. Fig. 1.1 gives a graph of the results length / cm load / N Fig. 1.1 the graph to find (a) the length of the spring with no load attached, length =... cm [1] (b) the length of the spring with 4.5 N attached, length =... cm [1] (c) the extension caused by a 4.5 N load. extension =... cm [2] UCLES /02/O/N/05

51 2 Palm trees are growing every 25 m alongside the highway in a holiday resort. 3 Examiner's IGCSE Fig. 2.1 The IGCSE school bus drives along the highway. (a) It takes 2 s for the bus to travel between palm tree 1 and palm tree 2. Calculate the average speed of the bus between tree 1 and tree 2. average speed =... [4] (b) It takes more than 2 s for the bus to travel from tree 2 to tree 3. State what this information indicates about the speed of the bus.... [1] (c) The speed of the bus continues to do what you have said in (b). State how the time taken to go from tree 3 to tree 4 compares with the time in (b). The time taken to travel from tree 3 to tree 4 is... the time to travel from tree 2 to tree 3. [1] UCLES /02/O/N/05 [Turn over

52 4 Examiner's 3 (a) Fig. 3.1 shows two examples of footwear being worn by people of equal weight at a Winter Olympics competition. skate ski Fig. 3.1 Which footwear creates the greatest pressure below it, and why? Which?... Why?... [2] (b) Drivers of high-sided vehicles, like the one in Fig. 3.2, are sometimes warned not to drive when it is very windy. Fig. 3.2 Suggest why they receive this warning [2] UCLES /02/O/N/05

53 4 A man is delivering a cupboard to a house. 5 Examiner's house wheels step Fig. 4.1 (a) The man rolls the cupboard at a steady speed from the lorry to the house. The friction force in the wheels is 40 N. State the force with which the man has to push. force =... N [1] (b) The cupboard weighs 720 N. State the smallest force needed to lift the cupboard. force =... N [1] (c) The step is 0.20 m high. Calculate the work required to lift the cupboard onto the step. work required =... [4] (d) The man has to ask his assistant to help him lift the cupboard onto the step. Together, they lift it onto the step in 1.2 s. The men work equally hard. Calculate the power developed by each man. power developed =... [4] UCLES /02/O/N/05 [Turn over

54 6 Examiner's 5 The apparatus shown in Fig. 5.1 is set up in a laboratory during a morning science lesson. flask air clamp tube water Fig. 5.1 Later in the day, the room temperature is higher than in the morning. (a) What change is observed in the apparatus?... [1] (b) Explain why this change happens.... [1] (c) Suggest one disadvantage of using this apparatus to measure temperature.... [1] UCLES /02/O/N/05

55 6 Fig. 6.1 shows a reed relay being used to switch on an electric motor when a variable resistor is adjusted. 7 Examiner's M + power supply reed relay S variable resistor Fig. 6.1 (a) The variable resistor is set at its greatest resistance and then switch S is closed. The reeds in the reed relay do not close when this is done. (i) State two things that happen in the coil of the reed relay [2] (ii) State what happens to the two reeds in the reed relay.... [1] (b) The resistance of the variable resistor is slowly decreased. The reeds in the reed relay close. Fig. 6.2(a) shows how the current in the coil changes with time. current in coil Fig. 6.2(a) 0 0 time current in motor Fig. 6.2(b) 0 0 time UCLES 2005 On Fig. 6.2(b), draw a line that might show how the current in the motor changes with time as the variable resistor is adjusted. [4] 0625/02/O/N/05 [Turn over

56 8 Examiner's 7 (a) The filament of a lamp is placed at the principal focus of a lens, as shown in Fig Fig. 7.1 On Fig. 7.1, continue the three rays through the lens and out into the air on the right of the lens. [1] (b) The lens in Fig. 7.2 has a focal length of 2.0 cm. object 1 cm 1 cm Fig. 7.2 On Fig. 7.2, (i) mark and label the positions of the principal focus on the left of the lens and the principal focus on the right of the lens, [1] (ii) carefully draw a ray from the top of the object, parallel to the axis, through the lens and continue it until it reaches the edge of the squared area, [1] (iii) carefully draw a ray from the top of the object, which travels parallel to the axis after it has passed through the lens, [1] (iv) draw and label the image. [2] UCLES /02/O/N/05

57 8 (a) Two magnets are laid on a bench. End A of an unidentified rod is held in turn above one end of each magnet, with the results shown in Fig Examiner's A N S A S N bench south pole lifted off bench north pole lifted off bench Fig. 8.1 (i) Suggest what the unidentified rod is made from.... [1] (ii) State what, if anything, happens when the end A is held over one end of 1. an unmagnetised iron bar, an uncharged plastic rod.... [2] (b) Fig. 8.2 shows four identical plotting compasses placed around a bar magnet where the magnetic field of the surroundings can be ignored. The pointer has only been drawn on one plotting compass. S N Fig. 8.2 On Fig. 8.2, draw the pointers on the other three plotting compasses to indicate the directions of the magnetic field of the bar magnet in those three places. [3] UCLES /02/O/N/05 [Turn over

58 10 Examiner's 9 (a) Fig. 9.1 shows five circuit symbols and their names. The names are in the wrong order. Draw a straight line from each symbol to its name. One line has been drawn as an example. V cell lamp ammeter voltmeter A switch Fig. 9.1 [3] (b) Fig. 9.2 shows a circuit. ammeter 1 switch lamp 2 lamp 1 cell 1.5 V ammeter 2 Fig. 9.2 UCLES /02/O/N/05

59 11 (i) In the space below, draw the circuit using circuit symbols. [1] Examiner's (ii) On your diagram in (b)(i), add a voltmeter connected to measure the potential difference across the cell. [1] (iii) When the switch is pressed so that the contacts join, which of the lamps light up?... [1] (iv) When there is a current in the circuit, ammeter 1 reads 0.5 A. What current does ammeter 2 read? (v) One lamp blows, so that its filament breaks. What happens in the circuit? current =... A [1] [1] UCLES /02/O/N/05 [Turn over

60 12 Examiner's 10 Some fat purchased from a shop is supplied as the block shown in Fig cm 4 cm 6.5 cm Fig the information in Fig to calculate (a) the volume of the block, volume =... cm 3 [2] (b) the density of the fat. Give your answer to 2 significant figures. density =... [5] UCLES /02/O/N/05

61 11 Fig shows a tube for producing cathode rays. The tube contains various parts. 13 Examiner's B C D A Fig A spot is formed on the screen by the cathode rays. (a) What do cathode rays consist of?... [1] (b) Which part, A, B, C or D, must be heated to create the cathode rays?... [1] (c) (i) Which part, A, B, C or D, is coated with fluorescent material?... [1] (ii) What is the purpose of the fluorescent material?... [1] (d) A potential difference is applied between the two halves of part C. What effect does this have on the cathode rays?... [1] (e) Explain why there needs to be a vacuum inside the tube [2] UCLES /02/O/N/05 [Turn over

62 12 (a) State what is meant by 14 Examiner's (i) the half-life of a radioactive substance, [3] (ii) background radiation [1] (b) In a certain laboratory, the background radiation level is 25 counts/minute. Fig is a graph of the count-rate measured by a detector placed a short distance from a radioactive source in the laboratory count-rate counts / min UCLES time / min Fig /02/O/N/05

63 (i) At zero time, the measured count-rate of the source and background together is 80 counts/minute. Calculate the count-rate due to the source alone. 15 Examiner's (ii) After one half-life has elapsed, what is the count-rate 1. due to the source alone, count-rate due to source =... counts/min [2] 2. measured by the detector? count-rate due to source =... counts/min count-rate measured by detector =... counts/min (iii) the graph to find the half-life of the source. [2] half-life of source =... min [1] (iv) Why does the graph not drop below the 25 counts/minute line? [1] (v) On Fig. 12.1, sketch the curve that might be obtained for a source with a shorter half-life. [2] UCLES /02/O/N/05

64 16 BLANK PAGE 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 University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge. 0625/02/O/N/05

65 Centre Number Candidate Number Name UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education PHYSICS 0625/02 Paper 2 Theory Candidates answer on the Question Paper. No Additional Materials are required. October/November hour 15 minutes 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 in the spaces provided on the Question Paper. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. Answer all questions. 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. 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/s 2 ). If you have been given a label, look at the details. If any details are incorrect or missing, please fill in your correct details in the space given at the top of this page. Stick your personal label here, if provided. This document consists of 15 printed pages and 1 blank page. SPA (NH/BI) S66584/2 UCLES 2004 [Turn over

66 1 Fig. 1.1 shows the top part of a measuring cylinder containing some liquid. 2 cm liquid Fig. 1.1 (a) What is the volume of liquid in the measuring cylinder? volume =...cm 3 [1] (b) (c) Fig. 1.1 indicates four ways the observer s eye could look when taking the reading from the measuring cylinder. Put a circle around the eye position that gives the correct reading. [1] In order to fill the measuring cylinder up to the 100 cm 3 mark, 80 drops of the liquid are added to the liquid already in the measuring cylinder. Calculate the average volume of one drop. average volume of a drop =...cm 3 [4] UCLES /02 O/N/04

67 2 (a) In Fig. 2.1, the sealed drum containing gas has a mercury manometer connected to it in order to indicate the gas pressure. 3 air pressure 760 mm of mercury gas pressure 781 mm of mercury A B mercury Fig. 2.1 convenience, gas pressure is often expressed in mm of mercury. The gas pressure is 781 mm of mercury and air pressure is 760 mm of mercury. (i) State the difference in height between levels A and B on the manometer. difference in height =...mm (ii) The temperature of the gas rises. State what happens to 1. the gas pressure, the level A, the level B.... [3] (b) The air in part (a) is also pressing on a large window pane in the wall of the room where the drum is situated. (i) State how the air pressure on the window pane compares with the air pressure on the mercury surface at B in Fig (ii) State how the force exerted by the air on the window pane compares with the force exerted by the air on the mercury surface at B.... [2] UCLES /02 O/N/04 [Turn over

68 3 A packaging company purchases corrugated cardboard boxes in which to pack its goods. The boxes are not made up when they are delivered, but are flat, as shown in Fig m 0.60 m 0.50 m Fig. 3.1 (a) A bundle of these boxes measures 0.60 m x 0.50 m x 0.20 m and has a mass of 7.2 kg. (i) Calculate the volume of the bundle of boxes. volume =...[3] (ii) Calculate the density of the corrugated cardboard. density =...[4] (b) Corrugated cardboard is made up of 3 sheets of thick paper stuck together. Fig. 3.2 shows an enlarged view of the edge of a sheet of corrugated cardboard. thick paper air Fig. 3.2 (i) Here is an incomplete sentence about the paper. The density of the paper is... that of the corrugated cardboard. Which of the words below correctly complete the sentence? Tick one box. greater than the same as less than (ii) Explain your answer to (b) (i) [2] UCLES /02 O/N/04

69 4 Logs of wood are burning in a camp-fire on the ground. A person is sitting nearby. 5 Fig. 4.1 (a) (i) State two types of energy that the burning logs possess (ii) State the main method of heat transfer by which energy from the fire reaches the person sitting nearby.... [3] (b) A spark jumps out of the fire. (i) State the name of the type of energy that the spark possesses due to its movement.... (ii) The spark lands on the person s hand. State which method of heat transfer causes the person to feel the spark.... (iii) The pain caused by the spark makes the person stand up. 1. State the type of energy that has increased, now that he is standing State the type of energy stored in his body that enabled him to stand.... [4] UCLES /02 O/N/04 [Turn over

70 5 In order to observe Brownian motion, some smoke is mixed with air trapped in a small glass box. The box is strongly illuminated from the side, and the smoke is viewed from above through a microscope. This is illustrated in Fig Fig. 5.1 (a) Describe what is seen when the microscope is focussed on the smoke particles [3] (b) State what causes the effect described in (a) [4] (c) The temperature of the glass box and its contents is increased. Suggest what change is seen through the microscope [1] UCLES /02 O/N/04

71 6 (a) Here is a list of solid materials. Put a tick in the box alongside those materials which are good conductors of heat. 7 aluminium copper cork gold polystyrene wood [3] (b) State the word we use to describe materials that are poor conductors of heat....[1] (c) From the list of materials given in (a), state which would be suitable to use for (i) (ii) the base of a cooking pot,... the covering on the handle of a kettle... [2] (d) Water is a poor conductor of heat. A beaker of water is heated as shown in Fig water heat Fig. 6.1 All the water heats up quite quickly. State the process by which heat spreads most rapidly through the water....[1] (e) State why the heating element is always placed near the bottom of an electric kettle [1] UCLES /02 O/N/04 [Turn over

72 7 A girl is walking along a path 1600 m from the rock-face of a quarry (a place where stone is obtained). 8 girl explosion rock face quarry 1600 m Fig. 7.1 (a) The quarry workers set off an explosion at X to break up some rock. The girl measures the time interval between seeing the flash and hearing the bang. The time is 5.0 s. (i) Calculate the speed of the sound. speed of sound =...m/s [3] (ii) State what assumption you have made in your working in (i)....[1] (b) Suppose the explosion had taken place at Y instead of X. State two ways in which the girl s observations would have been different [2] UCLES /02 O/N/04

73 8 Two light conducting balls A and B are hanging side by side, as shown in Fig Fig. 8.1 A and B are given a series of different charges, as indicated in the table below. In the third column of the table, write what is seen to happen in each case. the words repulsion or attraction or nothing, as appropriate. charge on A charge on B what is seen to happen positive negative positive zero negative positive negative negative positive zero [5] UCLES /02 O/N/04 [Turn over