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 0625/32 Paper 3 Extended 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. This document consists of 16 printed pages. SPA (SHW /07) T50467/4 UCLES 2008 [Turn over

2 2 1 (a) A truck of mass 12 kg is rolling down a very slight incline as shown in Fig kg Fig. 1.1 The truck travels at constant speed. Explain why, although the truck is on an incline, it nevertheless does not accelerate..... [1] (b) The slope of the incline is increased. As a result of this, the truck now accelerates. (i) Explain why there is now acceleration [1] Write down an equation linking the resultant force on the truck and the acceleration of the truck. [1] (iii) The truck s acceleration is 2.0 m/s 2. Calculate the resultant force on the truck. resultant force =... [2] UCLES /32/O/N/08

3 3 (c) The friction force up the slope in (b)(iii) was 14.0 N. By suitable lubrication, the friction force is now almost totally removed. (i) Calculate the new acceleration of the truck. acceleration =... [3] The lubricated truck travels down the incline, starting from rest at the top of the incline. It takes 2.5 s to reach the bottom of the incline. Calculate its speed as it reaches the bottom of the incline. speed =... [2] (d) The incline is reduced to the original value and the lubricated truck is placed on it. Describe the motion of the truck when it is released [1] [Total: 11] UCLES /32/O/N/08 [Turn over

4 4 2 Fig. 2.1 shows a circular metal disc of mass 200 g, freely pivoted at its centre. pivot Fig. 2.1 Masses of 100 g, 200 g, 300 g, 400 g, 500 g and 600 g are available, but only one of each value. These may be hung with string from any of the holes. There are three small holes on each side of the centre, one at 4.0 cm from the pivot, one at 8.0 cm from the pivot and one at 12.0 cm from the pivot. The apparatus is to be used to show that there is no net moment of force acting on a body when it is in equilibrium. (a) On Fig. 2.1, draw in two different value masses hanging from appropriate holes. The values of the masses should be chosen so that there is no net moment. Alongside the masses chosen, write down their values. [2] (b) Explain how you would test that your chosen masses give no net moment to the disc [1] (c) Calculate the moments about the pivot due to the two masses chosen. moment due to first mass =... moment due to second mass =... [2] UCLES /32/O/N/08

5 5 (d) Calculate the force on the pivot when the two masses chosen are hanging from the disc. force =... [2] [Total: 7] UCLES /32/O/N/08 [Turn over

6 6 3 (a) A submarine descends to a depth of 70 m below the surface of water. The density of the water is 1050 kg/m 3. Atmospheric pressure is Pa. Calculate (i) the increase in pressure as it descends from the surface to a depth of 70 m, increase in pressure =... [2] the total pressure on the submarine at a depth of 70 m. total pressure =... [1] (b) On another dive, the submarine experiences a total pressure of Pa. A hatch cover on the submarine has an area of 2.5 m 2. Calculate the force on the outside of the cover. force =... [2] (c) The submarine undergoes tests in fresh water of density 1000 kg/m 3. Explain why the pressure on the submarine is less at the same depth..... [1] [Total: 6] UCLES /32/O/N/08

7 7 4 The whole of a sealed, empty, dusty room is kept at a constant temperature of 15 C. Light shines into the room through a small outside window. An observer points a TV camera with a magnifying lens into the room through a second small window, set in an inside wall at right angles to the outside wall. Dust particles in the room show up on the TV monitor screen as tiny specks of light. (a) In the space below draw a diagram to show the motion of one of the specks of light over a short period of time. (b) After a period of one hour the specks are still observed, showing that the dust particles have not fallen to the floor. Explain why the dust particles have not fallen to the floor. You may draw a labelled diagram to help your explanation. [1] [2] (c) On another day, the temperature of the room is only 5 C. All other conditions are the same and the specks of light are again observed. Suggest any differences that you would expect in the movement of the specks when the temperature is 5 C, compared to before [1] [Total: 4] UCLES /32/O/N/08 [Turn over

8 8 5 Fig. 5.1 shows apparatus that could be used to determine the specific latent heat of fusion of ice. finely crushed ice 40 W electric heater glass funnel stand with clamps to hold funnel and heater Fig. 5.1 (a) In order to obtain as accurate a result as possible, state why it is necessary to (i) wait until water is dripping into the beaker at a constant rate before taking readings, [1] use finely crushed ice rather than large pieces [1] (b) The power of the heater and the time for which water is collected are known. Write down all the other readings that are needed to obtain a value for the specific latent heat of fusion of ice..... [2] UCLES /32/O/N/08

9 (c) (i) 9 Using a 40 W heater, 250 g of water is heated for 3.0 minutes. The temperature rise of the water is 5.9 C. these values to calculate a value for the specific heat capacity of water. specific heat capacity =... [3] The accepted value for the specific heat capacity of water is 4.2 J/(g C). State one possible reason why the value you obtained in (c)(i) is different from this.... [1] [Total: 8] UCLES /32/O/N/08 [Turn over

10 10 6 Fig. 6.1 shows a cross-section through a swimming pool. air A B water lamp Fig. 6.1 (a) A ray of monochromatic light from a lamp at the bottom of the pool strikes the surface at A, as shown. (i) State what is meant by monochromatic light.... [1] The water in the swimming pool has a refractive index of Using information from Fig. 6.1, calculate the angle of refraction at A. angle of refraction =... [3] (iii) On Fig. 6.1, draw the refracted ray. [1] (b) The critical angle for the water-air surface is Another ray of monochromatic light from the lamp strikes the surface at B, as shown in Fig (i) State and explain what happens to the ray after reaching B [2] On Fig. 6.1, draw this ray. [1] [Total: 8] UCLES /32/O/N/08

11 11 7 Fig. 7.1 shows a scale drawing of plane waves approaching a gap in a barrier. direction of travel of plane waves barrier Fig. 7.1 (a) On Fig. 7.1, draw in the pattern of the waves after they have passed the gap. [3] (b) The waves approaching the barrier have a wavelength of 2.5 cm and a speed of 20 cm/s. Calculate the frequency of the waves. frequency =... [2] (c) State the frequency of the diffracted waves.. [1] [Total: 6] UCLES /32/O/N/08 [Turn over

12 12 8 Fig. 8.1 shows a car battery being charged from a 200 V a.c. mains supply. 200 V ~ car battery Fig. 8.1 (a) State the function of the diode..... [1] (b) The average charging current is 2.0 A and the battery takes 12 hours to charge fully. Calculate the charge that the battery stores when fully charged. charge stored... [2] (c) The battery has an electromotive force (e.m.f.) of 12 V and, when connected to a circuit, supplies energy to the circuit components. State what is meant by an electromotive force of 12 V [2] UCLES /32/O/N/08

13 (d) (i) 13 In the space below, draw a circuit diagram to show how two 6.0 V lamps should be connected to a 12 V battery so that both lamps glow with normal brightness. [1] The power of each lamp is 8.0 W. Calculate the current in the circuit. (iii) current =... [2] Calculate the energy used by the two lamps when both are lit for one hour. energy =... [2] [Total: 10] UCLES /32/O/N/08 [Turn over

14 14 9 Fig. 9.1 is a block diagram of an electrical energy supply system, using the output of a coalfired power station. power station output at 1100 V step-up transformer transmission output at V step-down transformer output at 240 V consumer Fig. 9.1 (a) Suggest one possible way of storing surplus energy when the demand from the consumers falls below the output of the power station..... [1] (b) State why electrical energy is transmitted at high voltage.. [1] (c) A transmission cable of resistance R carries a current I. Write down a formula that gives the power loss in the cable in terms of R and I.. [1] (d) The step-up transformer has 1200 turns on the primary coil. Using the values in Fig. 9.1, calculate the number of turns on its secondary coil. Assume that the transformer has no energy losses. (e) The input to the step-up transformer is 800 kw. number of turns =... [2] Using the values in Fig. 9.1, calculate the current in the transmission cables, assuming that the transformer is 100% efficient. current =... [3] [Total: 8] UCLES /32/O/N/08

15 15 10 Fig shows a circuit for a warning lamp that comes on when the external light intensity falls below a pre-set level. + low voltage supply Fig (a) On Fig. 10.1, label (i) with the letter X the component that detects the change in external light intensity, with the letter Y the lamp, (iii) with the letter Z the component that switches the lamp on and off. [3] (b) Describe how the circuit works as the external light intensity decreases and the lamp comes on [3] [Total: 6] UCLES /32/O/N/08 [Turn over

16 16 11 Fig shows the basic design of the tube of a cathode ray oscilloscope (CRO). heater filament B C cathode rays A anode D Fig (a) On Fig. 11.1, write the names of parts A, B, C and D in the boxes provided. [2] (b) State the function of: part A, part B..... [2] (c) A varying p.d. from a 12 V supply is connected to a CRO, so that the waveform of the supply is shown on the screen. To which of the components in Fig (i) is the 12 V supply connected,... [1] is the time-base connected?... [1] [Total: 6] UCLES /32/O/N/08

17 UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education * * PHYSICS 0625/03 Paper 3 Extended 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 14 printed pages and 2 blank pages. SPA (MML /06) T25941/7 UCLES 2007 [Turn over

18 1 A large plastic ball is dropped from the top of a tall building. 2 Fig. 1.1 shows the speed-time graph for the falling ball until it hits the ground. 20 speed m / s time / s Fig. 1.1 (a) From the graph estimate, (i) the time during which the ball is travelling with terminal velocity, time =... [1] the time during which the ball is accelerating, time =... [1] (iii) the distance fallen while the ball is travelling with terminal velocity, distance =... [2] (iv) the height of the building. height =... [2] UCLES /03/O/N/07

19 (b) Explain, in terms of the forces acting on the ball, why 3 (i) the acceleration of the ball decreases,... [3] the ball reaches terminal velocity.... [2] [Total: 11] UCLES /03/O/N/07 [Turn over

20 2 Fig. 2.1 shows a track for a model car. 4 S Q P 0.4 m 0.4 m 0.5 m T R Fig. 2.1 The car has no power supply, but can run down a sloping track due to its weight. (a) The car is released at Q. It comes to rest just before it reaches S and rolls back. (i) Describe the motion of the car after it starts rolling back and until it eventually comes to rest.... [2] Explain in terms of energy transformations why the car, starting at Q, cannot pass S.... [1] (b) A second car, of mass 0.12 kg, is released from P. It continues until it runs off the track at T. Calculate the maximum speed that the car could have at T assuming friction in the car is negligible. speed =... [3] [Total: 6] UCLES /03/O/N/07

21 3 (a) A spring of original length 3.0 cm is extended to a total length of 5.0 cm by a force of 8.0 N. 5 Assuming the limit of proportionality of the spring has not been reached, calculate the force needed to extend it to a total length of 6.0 cm. (b) Fig. 3.1 shows the arrangement for an experiment on moments. force =... [3] pivot metre rule F spring Fig. 3.1 The spring exerts a force F on the metre rule. (i) On Fig. 3.1, mark another quantity which must be measured to find the moment of the force F. [1] State how the moment of the force F is calculated.... [1] [Total: 5] UCLES /03/O/N/07 [Turn over

22 4 Fig. 4.1 shows a sealed steel cylinder filled with high pressure steam. 6 steam Fig. 4.1 Fig. 4.2 shows the same cylinder much later when all the steam has condensed. water Fig. 4.2 (a) (i) Describe the movement of the molecules in the high pressure steam.... [2] Explain how the molecules in the steam exert a high pressure on the inside walls of the cylinder.... [2] (b) Describe, in terms of particles, the process by which heat is transferred through the cylinder wall... [2] (c) When all the steam has condensed, 75 g of water is in the cylinder. Under these high pressure conditions, the specific latent heat of vaporisation of steam is 3200 J / g. Calculate the heat lost by the steam as it condenses. heat =... [2] [Total: 8] UCLES /03/O/N/07

23 5 Fig. 5.1 shows some apparatus which is to be used to compare the emission of infra-red radiation from four differently painted surfaces. 7 metal box this side painted shiny white water inlet this side painted dull white this side painted dull black this side painted shiny black Fig. 5.1 Near the centre of each side is an infra-red detector. The four detectors are identical. A supply of very hot water is available. (a) Describe how you would use this apparatus to compare the infra-red radiation from the four surfaces... [3] (b) Suggest which surface will be the best emitter and which will be the worst emitter. best emitter... worst emitter... [1] (c) The infra-red detectors are made from thermocouples soldered to blackened metal plates. These are connected to galvanometers. In the space below, draw a labelled diagram of a thermocouple. [2] [Total: 6] UCLES /03/O/N/07 [Turn over

24 6 Virtual images may be formed by both plane mirrors and by convex lenses. 8 Fig. 6.1 shows a plane mirror and a convex lens. O P F F Fig. 6.1 (a) On Fig. 6.1, draw rays to locate the approximate positions of the images of the tops of the two arrow objects O and P. Label the images. [5] (b) Both images are virtual. (i) What is meant by a virtual image?... [1] State one other similarity between the two images.... [1] (iii) State one difference between the two images.... [1] [Total: 8] UCLES /03/O/N/07

25 7 (a) In the space below, draw a diagram to represent a sound wave. 9 On your diagram, mark and label (i) two consecutive compressions and two consecutive rarefactions, the wavelength of the wave. [3] (b) Fig. 7.1 shows part of the electromagnetic spectrum. X-RAYS INFRA RED Fig. 7.1 (i) On Fig. 7.1, label the positions of γ-rays, visible light waves and radio waves. [1] State which of the three types of wave in (i) has the lowest frequency.... [1] (iii) State the approximate value of the speed in air of radio waves.... [1] [Total: 6] UCLES /03/O/N/07 [Turn over

26 8 Fig. 8.1 shows two electrical circuits. 10 V 4.0 Ω A ammeter Ω P ammeter P 6.0 Ω A A Ω Q Q circuit 1 circuit 2 The batteries in circuit 1 and circuit 2 are identical. Fig. 8.1 (a) Put ticks in the table below to describe the connections of the two resistors P and Q. series parallel circuit 1 circuit 2 (b) The resistors P and Q are used as small electrical heaters. [1] State two advantages of connecting them as shown in circuit 2. advantage 1... advantage 2... [2] (c) In circuit 1, the ammeter reads 1.2 A when the switch is closed. Calculate the reading of the voltmeter in this circuit. voltmeter reading =... [2] (d) The two switches in circuit 2 are closed. Calculate the combined resistance of the two resistors in this circuit. combined resistance =... [2] UCLES /03/O/N/07

27 11 (e) When the switches are closed in circuit 2, ammeter 1 reads 5 A and ammeter 2 reads 2 A. Calculate (i) the current in resistor P, current =... [1] the power supplied to resistor Q, power =... [1] (iii) the energy transformed in resistor Q in 300 s. energy =... [1] [Total: 10] UCLES /03/O/N/07 [Turn over

28 9 Electromagnetic induction may be demonstrated using a magnet, a solenoid and other necessary apparatus. 12 (a) Explain what is meant by electromagnetic induction... [2] (b) In the space below, draw a labelled diagram of the apparatus set up so that electromagnetic induction may be demonstrated. [2] (c) Describe how you would use the apparatus to demonstrate electromagnetic induction... [2] (d) State two ways of increasing the magnitude of the induced e.m.f. in this experiment [2] [Total: 8] UCLES /03/O/N/07

29 10 (a) Fig shows an AND gate with two inputs A and B and one output. 13 A output B Fig State the output when (i) A is high and B is low,... [1] both A and B are low.... [1] (b) An electrical thermometer in a greenhouse gives a low output if the temperature is too low. A humidity sensor in the same greenhouse gives a high output if the humidity in the greenhouse is too high. An alarm sounds when both the temperature is too low and the humidity is too high. (i) Complete the diagram below to show how a NOT gate and an AND gate may be used to provide the required output to the alarm. [2] electrical thermometer alarm humidity sensor On your diagram, use either high or low to indicate the level of the inputs and outputs of both gates when the alarm sounds. [2] [Total: 6] UCLES /03/O/N/07 [Turn over

30 11 Fig shows an experiment to test the absorption of β-particles by thin sheets of aluminium. Ten sheets are available, each 0.5 mm thick. 14 β-particle source sheets of aluminium detector counter Fig (a) Describe how the experiment is carried out, stating the readings that should be taken... [4] (b) State the results that you would expect to obtain... [2] [Total: 6] UCLES /03/O/N/07

31 15 BLANK PAGE 0625/03/O/N/07

32 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 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. 0625/03/O/N/07

33 UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education PHYSICS Paper 3 Extended 0625/03 October/November 2006 Candidates answer on the Question Paper. No Additional Materials are required. 1 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 ). DO NOT WRITE IN THE BARCODE. DO NOT WRITE IN THE GREY AREAS BETWEEN THE PAGES. 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 15 printed pages and 1 blank page. SP (SLM/KS) T04132/2 UCLES 2006 [Turn over

34 2 1 (a) A stone falls from the top of a building and hits the ground at a speed of 32 m/s. The air resistance-force on the stone is very small and may be neglected. (i) Calculate the time of fall. time =... On Fig. 1.1, draw the speed-time graph for the falling stone. 40 speed m/s time/s (iii) The weight of the stone is 24 N. Calculate the mass of the stone. Fig. 1.1 mass =... [5] UCLES /03/O/N/06

35 3 (b) A student used a suitable measuring cylinder and a spring balance to find the density of a sample of the stone. (i) Describe how the measuring cylinder is used, and state the readings that are taken. Describe how the spring balance is used, and state the reading that is taken. (iii) Write down an equation from which the density of the stone is calculated. (iv) The student then wishes to find the density of cork. Suggest how the apparatus and the method would need to be changed. [6] UCLES /03/O/N/06 [Turn over

36 4 2 In an experiment, forces are applied to a spring as shown in Fig. 2.1a. The results of this experiment are shown in Fig. 2.1b. 16 Q R ruler spring force/n P weights extension/mm Fig. 2.1a Fig. 2.1b (a) What is the name given to the point marked Q on Fig. 2.1b?...[1] (b) the part OP of the graph, the spring obeys Hooke s Law. State what this means....[1] (c) The spring is stretched until the force and extension are shown by the point R on the graph. Compare how the spring stretches, as shown by the part of the graph OQ, with that shown by QR....[1] (d) The part OP of the graph shows the spring stretching according to the expression F = kx. values from the graph to calculate the value of k. k =...[2] UCLES /03/O/N/06

37 5 3 Fig. 3.1 shows water falling over a dam. dam falling water 7.0 m Fig. 3.1 (a) The vertical height that the water falls is 7.0 m. Calculate the potential energy lost by 1.0 kg of water during the fall. potential energy =...[2] (b) Assuming all this potential energy loss is changed to kinetic energy of the water, calculate the speed of the water, in the vertical direction, at the end of the fall. speed =...[3] (c) The vertical speed of the water is less than that calculated in (b). Suggest one reason for this....[1] UCLES /03/O/N/06 [Turn over

38 6 4 Some water is heated electrically in a glass beaker in an experiment to find the specific heat capacity of water. The temperature of the water is taken at regular intervals. The temperature-time graph for this heating is shown in Fig temperature / C time / s Fig. 4.1 (a) (i) the graph to find 1. the temperature rise in the first 120 s, 2. the temperature rise in the second 120 s interval Explain why these values are different. [2] (b) The experiment is repeated in an insulated beaker. This time, the temperature of the water increases from 20 C to 60 C in 210 s. The beaker contains 75 g of water. The power of the heater is 60 W. Calculate the specific heat capacity of water. specific heat capacity =...[4] UCLES /03/O/N/06

39 7 (c) In order to measure the temperature during the heating, a thermocouple is used. Draw a labelled diagram of a thermocouple connected to measure temperature. [2] UCLES /03/O/N/06 [Turn over

40 8 5 (a) Fig. 5.1 shows a copper rod AB being heated at one end. copper rod B A Bunsen burner Fig. 5.1 (i) Name the process by which heat moves from A to B. By reference to the behaviour of the particles of copper along AB, state how this process happens. [3] (b) Give an account of an experiment that is designed to show which of four surfaces will absorb most heat radiation. The four surfaces are all the same metal, but one is a polished black surface, one is a polished silver surface, one is a dull black surface and the fourth one is painted white. Give your answer under the headings below. labelled diagram of the apparatus readings to be taken one precaution to try to achieve a fair comparison between the various surfaces...[3] UCLES /03/O/N/06

41 9 6 Fig. 6.1 shows a ray of light, from the top of an object PQ, passing through two glass prisms. P A B Q C D F E Fig. 6.1 (a) Complete the path through the two prisms of the ray shown leaving Q. [1] (b) A person looking into the lower prism, at the position indicated by the eye symbol, sees an image of PQ. State the properties of this image....[2] (c) Explain why there is no change in direction of the ray from P at points A, C, D and F....[1] (d) The speed of light as it travels from P to A is m/s and the refractive index of the prism glass is 1.5. Calculate the speed of light in the prism. speed =...[2] (e) Explain why the ray AB reflects through 90 at B and does not pass out of the prism at B....[2] UCLES /03/O/N/06 [Turn over

42 10 7 Fig. 7.1 is a drawing of a student s attempt to show the diffraction pattern of water waves that have passed through a narrow gap in a barrier. barrier with narrow gap direction of water waves Fig. 7.1 (a) State two things that are wrong with the wave pattern shown to the right of the barrier [2] (b) In the space below, sketch the wave pattern when the gap in the barrier is made five times wider. (c) The waves approaching the barrier have a wavelength of 1.2 cm and a frequency of 8.0 Hz. Calculate the speed of the water waves. [2] speed =...[2] UCLES /03/O/N/06

43 11 8 Fig. 8.1 shows a low-voltage lighting circuit. 12 V d.c. supply X Y Z Fig. 8.1 (a) On Fig. 8.1, indicate with a dot and the letter S, a point in the circuit where a switch could be placed that would turn off lamps Y and Z at the same time but would leave lamp X still lit. [1] (b) (i) In the space below, draw the circuit symbol for a component that would vary the brightness of lamp X. On Fig. 8.1, mark with a dot and the letter R where this component should be placed. [2] (c) Calculate the current in lamp Y. (d) The current in lamp Z is 3.0 A. Calculate the resistance of this lamp. current =...[2] (e) The lamp Y is removed. resistance =...[2] (i) Why do lamps X and Z still work normally? The current in lamp X is 1.0 A. Calculate the current supplied by the battery with lamp Y removed. UCLES /03/O/N/06 current =... [2] [Turn over

44 12 9 (a) Fig. 9.1 shows how a beam of electrons would be deflected by an electric field produced between two metal plates. The connections of the source of high potential difference are not shown. beam of electrons + high potential difference metal plate metal plate Fig. 9.1 (i) On Fig. 9.1, draw in the missing connections. Explain why the beam of electrons is deflected in the direction shown. In your answer, consider all the charges involved and their effect on each other. [5] (b) The deflection of a beam of electrons by an electric field is used in cathode-ray oscilloscopes. (i) What makes the electron beam move backwards and forwards across the screen? What makes the electron beam move up and down the screen? [2] UCLES /03/O/N/06

45 13 (c) An a.c. waveform is displayed so that two full waves appear on the screen of a cathoderay oscilloscope. Fig. 9.2 shows the face of the oscilloscope. On Fig. 9.2, draw in the waveform. Fig. 9.2 [1] UCLES /03/O/N/06 [Turn over

46 14 10 Fig shows a circuit that is used to switch on a lamp automatically when it starts to go dark. A D + V C B Fig (a) Write down the names of the components labelled A, B, C and D. A... B... C... D... [2] (b) Which of the four components A, B, C or D acts as a switch?...[1] (c) Explain why the lamp comes on as it goes dark....[3] UCLES /03/O/N/06

47 15 11 (a) α-particles, β-particles and γ-rays are known as ionising radiations. (i) Describe what happens when gases are ionised by ionising radiations. Suggest why α-particles are considered better ionisers of gas than β-particles. [3] (b) (i) Suggest two practical applications of radioactive isotopes one of the applications that you have suggested, describe how it works, or draw a labelled diagram to illustrate it in use. [4] UCLES /03/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. 0625/03/O/N/06

49 UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education PHYSICS Paper 3 Extended Candidates answer on the Question Paper. No Additional Materials are required. 0625/03 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, music 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. Take the weight of 1 kg to be 10 N (i.e. acceleration of free fall = 10 m/s 2 ). 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. DO NOT WRITE IN THE BARCODE. DO NOT WRITE IN THE GREY AREAS BETWEEN THE PAGES Total This document consists of 14 printed pages and 2 blank pages. SP (SJF3441/CG) T03202/4 UCLES 2005 [Turn over

50 2 1 (a) State what is meant by the terms (i) weight, [1] density [1] (b) A student is given a spring balance that has a scale in newtons. The student is told that the acceleration of free-fall is 10 m/s 2. (i) Describe how the student could find the mass of an irregular solid object [2] Describe how the student could go on to find the density of the object [2] (c) Fig. 1.1 shows three forces acting on an object of mass 0.5 kg. All three forces act through the centre of mass of the object. centre of mass 9.0 N 3.0 N 4.0 N Fig. 1.1 Calculate (i) the magnitude and direction of the resultant force on the object, magnitude = direction... [2] the magnitude of the acceleration of the object. acceleration = [2] UCLES /03/O/N/05

51 3 2 Fig. 2.1 shows apparatus for investigating moments of forces. spring balance horizontally balanced metre rule N weight horizontal pivot Fig. 2.1 The uniform metre rule shown in Fig. 2.1 is in equilibrium. (a) Write down two conditions for the metre rule to be in equilibrium. condition 1... condition [2] (b) Show that the value of the reading on the spring balance is 8.0 N. [2] (c) The weight of the uniform metre rule is 1.5 N. Calculate the force exerted by the pivot on the metre rule. magnitude of force = direction of force [2] UCLES /03/O/N/05 [Turn over

52 4 3 Fig. 3.1 shows a pond that is kept at a constant depth by a pressure-operated valve in the base. water outlet pressure-operated valve spring Fig. 3.1 (a) The pond is kept at a depth of 2.0 m. The density of water is 1000 kg/m 3. Calculate the water pressure on the valve. pressure =.. [2] (b) The force required to open the valve is 50 N. The valve will open when the water depth reaches 2.0 m. Calculate the area of the valve. area =.. [2] (c) The water supply is turned off and the valve is held open so that water drains out through the valve. State the energy changes of the water that occur as the depth of the water drops from 2.0 m to zero.... [2] UCLES /03/O/N/05

53 5 4 Fig. 4.1 shows apparatus that could be used to measure the specific latent heat of ice. 60 W heater power supply melting ice at 0 C beaker Fig. 4.1 (a) Describe how you would use the apparatus. You may assume that ice at 0 C and a stopwatch are available. State all the readings that would be needed at each stage.... [4] (b) In an experiment, 120 g of ice at 0 C is to be melted. The specific latent heat of ice is 340 J/g. Assume that all the energy from the heater will be used to melt the ice. Calculate the expected time for which the 60 W heater is switched on. expected time = [2] (c) When the experiment is carried out, the ice melts in slightly less time than the expected time. (i) State one reason why this happens..... [1] Suggest one modification to the experiment that would reduce the difference between the experimental time and the expected time..... [1] [Turn over UCLES /03/O/N/05

54 6 5 Fig. 5.1 shows a way of indicating the positions and direction of movement of some molecules in a gas at one instant. cylinder piston Fig. 5.1 (a) (i) Describe the movement of the molecules.... [1] Explain how the molecules exert a pressure on the container walls..... [1] (b) When the gas in the cylinder is heated, it pushes the piston further out of the cylinder. State what happens to (i) the average spacing of the molecules,... [1] the average speed of the molecules.... [1] (c) The gas shown in Fig. 5.1 is changed into a liquid and then into a solid by cooling. Compare the gaseous and solid states in terms of (i) the movement of the molecules,.... [1] the average separation of the molecules..... [1] UCLES /03/O/N/05

55 7 6 Fig. 6.1 shows the path of a sound wave from a source X. X path of sound wave Y wall Fig. 6.1 (a) State why a person standing at point Y hears an echo.... [1] (b) The frequency of the sound wave leaving X is 400 Hz. State the frequency of the sound wave reaching Y. frequency =.. [1] (c) The speed of the sound wave leaving X is 330 m/s. Calculate the wavelength of these sound waves. wavelength =. [2] (d) Sound waves are longitudinal waves. State what is meant by the term longitudinal.... [1] UCLES /03/O/N/05 [Turn over

56 8 7 (a) Fig. 7.1 shows two rays of light from a point O on an object. These rays are incident on a plane mirror. O Fig. 7.1 (i) On Fig. 7.1, continue the paths of the two rays after they reach the mirror. Hence locate the image of the object O. Label the image I. [2] Describe the nature of the image I..... [2] (b) Fig. 7.2 is drawn to scale. It shows an object PQ and a convex lens. P position of convex lens principal focus F Q F principal focus principal axis Fig. 7.2 UCLES /03/O/N/05

57 (i) 9 On Fig. 7.2, draw two rays from the top of the object P that pass through the lens. these rays to locate the top of the image. Label this point T. [3] On Fig. 7.2, draw an eye symbol to show the position from which the image T should be viewed. [1] UCLES /03/O/N/05 [Turn over

58 10 8 Fig. 8.1 shows a high-voltage supply connected across two metal plates. + high-voltage supply A metal plates Fig. 8.1 When the supply is switched on, an electric field is present between the plates. (a) Explain what is meant by an electric field.... [2] (b) (c) On Fig. 8.1, draw the electric field lines between the plates and indicate their direction by arrows. [2] The metal plates are now joined by a high-resistance wire. A charge of C passes along the wire in 30 s. Calculate the reading on the ammeter. ammeter reading = [2] (d) The potential difference of the supply is re-set to 1500 V and the ammeter reading changes to A. Calculate the energy supplied in 10 s. Show your working. energy =. [3] UCLES /03/O/N/05

59 11 9 (a) In the space provided, draw the symbol for a NOR gate. Label the inputs and the output. [2] (b) State whether the output of a NOR gate will be high (ON) or low (OFF) when (i) one input is high and one input is low,. both inputs are high.. [1] (c) Fig. 9.1 shows a digital circuit made from three NOT gates and one NAND gate. HIGH LOW Fig. 9.1 (i) Write HIGH or LOW in each of the boxes on Fig [2] State the effect on the output of changing both of the inputs..... [1] UCLES /03/O/N/05 [Turn over

60 12 10 Fig shows the basic parts of a transformer. X primary coil X secondary coil input output Y Y Fig (a) ideas of electromagnetic induction to explain how the input voltage is transformed into an output voltage. the three questions below to help you with your answer. What happens in the primary coil? What happens in the core? What happens in the secondary coil?... [5] (b) State what is needed to make the output voltage higher than the input voltage.... [1] UCLES /03/O/N/05

61 (c) (d) 13 The core of this transformer splits along XX and YY. Explain why the transformer would not work if the two halves of the core were separated by about 30 cm.... [1] A 100% efficient transformer is used to step up the voltage of a supply from 100 V to 200 V. A resistor is connected to the output. The current in the primary coil is 0.4 A. Calculate the current in the secondary coil. current = [2] UCLES /03/O/N/05 [Turn over

62 14 11 A radioactive source emits only β-particles. (a) A scientist wishes to investigate the deflection of β-particles by an electric field. Draw a labelled diagram to suggest a suitable experimental arrangement. [3] (b) State how the apparatus would be used to show the deflection of the β-particles by the electric field.... [2] (c) State how the results would show the deflection of the β-particles.... [1] (d) Explain the direction of the deflection obtained.... [1] UCLES /03/O/N/05

63 15 BLANK PAGE 0625/03/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. 0625/03/O/N/05

65 UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education PHYSICS Paper 3 Candidates answer on the Question Paper. No Additional Materials are required. 0625/03 October/November hour 15 minutes Candidate Name Centre Number Candidate Number 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. DO NOT WRITE IN THE BARCODE. DO NOT WRITE IN THE GREY AREAS BETWEEN THE PAGES. 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 on this page. Stick your personal label here, if provided Total SPA (NH/BI) S80765/4 UCLES 2004 This document consists of 15 printed pages and 1 blank page. [Turn over

66 2 1 Fig. 1.1 shows the path of one drop of water in the jet from a powerful hose. vertical path of a single water drop hose set in ground Fig. 1.1 Fig. 1.2 is a graph of speed against time for the water drop shown in Fig speed m / s time after leaving the hose / s Fig. 1.2 (a) Describe the movement of the water drop in the first 4 s after leaving the hose....[2] UCLES /03 O/N/04

67 (b) 3 Fig. 1.2 to find (i) the speed of the water leaving the hose, speed =... the time when the speed of the water is least. time =... [2] (c) values from Fig. 1.2 to calculate the acceleration of the drop as it falls back towards the ground. Show your working. acceleration =...[3] (d) Calculate the greatest distance above the ground reached by the drop. distance =...[3] UCLES /03 O/N/04 [Turn over

68 4 2 Fig. 2.1 shows a reservoir that stores water. water 20 m valve dam exit pipe Fig. 2.1 (a) The valve in the exit pipe is closed. The density of water is 1000 kg/m 3 and the acceleration of free fall is 10 m/s 2. Calculate the pressure of the water acting on the closed valve in the exit pipe. (b) The cross-sectional area of the pipe is 0.5 m 2. Calculate the force exerted by the water on the closed valve. pressure =...[2] force =...[2] (c) The valve is then opened and water, originally at the surface of the reservoir, finally flows out of the exit pipe. State the energy transformation of this water between the surface of the reservoir and the open end of the pipe....[2] UCLES /03 O/N/04

69 5 3 A scientist needs to find the density of a sample of rock whilst down a mine. He has only a spring balance, a measuring cylinder, some water and some thread. (a) In the space below, draw two labelled diagrams, one to show the spring balance being used and the other to show the measuring cylinder being used with a suitable rock sample. [2] (b) The spring balance is calibrated in newtons. State how the mass of the rock sample may be found from the reading of the spring balance....[1] (c) State the readings that would be taken from the measuring cylinder....[1] (d) State how the volume of the rock would be found from the readings....[1] (e) State in words the formula that would be used to find the density of the sample. density = [1] UCLES /03 O/N/04 [Turn over

70 6 4 (a) Fig. 4.1 shows a simple type of thermocouple that has been calibrated to measure temperature. copper wire hot junction iron wire V sensitive voltmeter cold junction Fig. 4.1 (i) Describe how the thermocouple could be used to measure the temperature of a beaker of hot water.... State two situations where a thermocouple would be a good choice of thermometer to measure temperature [4] UCLES /03 O/N/04

71 (b) 7 A mercury-in-glass thermometer is placed in an insulated beaker of water at 60 C. The water is heated at a constant rate. The temperature of the water is measured and recorded on the graph shown in Fig temperature/ C time/min Fig. 4.2 State the effect of the heat supplied (i) during the period 0 to 5 minutes,.... during the period 10 to 15 minutes... [2] UCLES /03 O/N/04 [Turn over

72 8 5 (a) Fig. 5.1 shows a sealed box. Fig. 5.1 (i) The box contains a large number of air molecules. On Fig. 5.1, draw a possible path of one of the air molecules, as it moves inside the box. Explain 1 how air molecules in the box create a pressure on the inside walls, why this pressure rises as the temperature of the air in the box increases [5] (b) Air in a cylinder is compressed slowly, so that the temperature does not rise. The pressure changes from 2.0 x 10 5 Pa to 5.0 x 10 5 Pa. The original volume was 0.35 m 3. Calculate the new volume. volume =...[3] UCLES /03 O/N/04

73 9 6 Fig. 6.1 shows an optical fibre. XY is a ray of light passing along the fibre. Y fibre Z X Fig. 6.1 (a) On Fig. 6.1, continue the ray XY until it passes Z. [1] (b) Explain why the ray does not leave the fibre at Y....[2] (c) The light in the optical fibre has a wavelength of 3.2 x 10 7 m and is travelling at a speed of 1.9 x 10 8 m/s. (i) Calculate the frequency of the light. frequency =... The speed of light in air is 3.0 x 10 8 m/s. Calculate the refractive index of the material from which the fibre is made. refractive index =... [4] UCLES /03 O/N/04 [Turn over

74 10 7 Fig. 7.1 shows a 12 V battery connected to a number of resistors. 12 V 4 Ω 4 Ω A 8 Ω 5 Ω 5 Ω Fig. 7.1 (a) Calculate the current in the 8 Ω resistor. current =..[2] (b) Calculate, for the resistors connected in the circuit, the combined resistance of (i) the two 5 Ω resistors, resistance =.. the two 4 Ω resistors. resistance =.. [2] (c) The total current in the two 4 Ω resistors is 6 A. Calculate the total power dissipated in the two resistors. power =..[2] UCLES /03 O/N/04

75 (d) 11 What will be the reading on a voltmeter connected across (i) the two 4 Ω resistors, reading =.. one 5 Ω resistor? reading =.. [2] (e) The 8 Ω resistor is made from a length of resistance wire of uniform cross-sectional area. State the effect on the resistance of the wire of using (i) the same length of the same material with a greater cross-sectional area,. a smaller length of the same material with the same cross-sectional area.. [2] UCLES /03 O/N/04 [Turn over

76 12 8 Fig. 8.1 shows plane waves passing through a gap in a barrier that is approximately equal to the wavelength of the waves. barrier Fig. 8.1 (a) What is the name given to the wave property shown in Fig. 8.1?...[1] (b) In the space below, carefully draw the pattern that would be obtained if the gap were increased to six times the wavelength of the waves. [4] (c) The effect in Fig. 8.1 is often shown using water waves on the surface of a tank of water. These are transverse waves. Explain what is meant by a transverse wave....[2] UCLES /03 O/N/04

77 13 9 (a) An engine on a model railway needs a 6 V a.c. supply. A mains supply of 240 V a.c. is available. (i) In the space below, draw a labelled diagram of a transformer suitable for producing the required supply voltage. Suggest suitable numbers of turns for the coils... [4] (b) The power needed for this model engine is 12 W. Calculate the current taken from the mains when just this engine is in use, assuming that the transformer is 100% efficient. current =..[2] (c) Explain why transformers will only work when connected to an a.c. supply....[2] UCLES /03 O/N/04 [Turn over

78 14 10 (a) (i) What is the function of a transistor when placed in an electrical circuit?. Describe the action of a transistor.. [3] (b) (i) In the space below, draw the symbol for an OR gate. Label the inputs and the output. [1] Describe the action of an OR gate that has two inputs......[2] UCLES /03 O/N/04

79 15 11 (a) The decay of a nucleus of radium 226 Ra leads to the emission of an α-particle and 88 leaves behind a nucleus of radon (Rn). In the space below, write an equation to show this decay. [2] (b) In an experiment to find the range of α-particles in air, the apparatus in Fig was used. α particle source detector ruler Fig The results of this experiment are shown below. count rate / (counts/minute) distance from source to detector/cm (i) State what causes the count rate 9 cm from the source.. Estimate the count rate that is due to the source at a distance of 2 cm.. (iii) Suggest a value for the maximum distance that α-particles can travel from the source.. (iv) Justify your answer to (iii)... [4] UCLES /03 O/N/04

80 16 BLANK PAGE Every reasonable effort has been made to trace all copyright holders where the publishers (i.e UCLES) are aware that third-party material has been reproduced. The publishers would be pleased to hear from anyone whose rights we have unwittingly infringed. 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. 0625/03 O/N/04