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 0625/31 Paper 3 Extended May/June 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 20 printed pages. SPA SHW /08 T76318/3 UCLES 2009 [Turn over

2 2 1 An engineering machine has a piston which is going up and down approximately 75 times per minute. Describe carefully how a stopwatch may be used to find accurately the time for one up-anddown cycle of the piston [4] [Total: 4] UCLES /31/M/J/09

3 3 2 (a) A certain volume of water at room temperature and the same volume of ice in a freezer are each heated through the same temperature rise. Which of them will have the greater expansion, and why? Which?... Why?... [1] (b) strength, concrete pillars are usually reinforced with metal rods, which are embedded in the concrete before it sets. The list below shows how much a length of 1 m of each material expands when the temperature rises by 1 C. aluminium concrete steel 0.03 mm 0.01 mm 0.01 mm this information to decide which metal should be used to reinforce concrete, why it is suitable, and why the other metal is not suitable. Which metal should be used?... Why is it suitable?... Why is the other metal unsuitable? [3] [Total: 4] UCLES /31/M/J/09 [Turn over

4 4 3 (a) Fig. 3.1 shows a skier descending a hillside. Fig. 3.2 shows the speed/time graph of his motion. 6 speed m / s time / s Fig. 3.1 Fig. 3.2 (i) How can you tell that the acceleration of the skier is constant during the 8 s shown on the graph?... [1] Calculate the acceleration of the skier. acceleration =... [2] (b) Another skier starts from rest at the top of the slope. As his speed increases the friction force on the skier increases. (i) State the effect of this increasing friction force on the acceleration.... [1] Eventually the speed of the skier becomes constant. What can be said about the friction force when the speed is constant?... [2] UCLES /31/M/J/09

5 5 (iii) 1. On the axes of Fig. 3.3, sketch a possible speed/time graph for the motion of the second skier. speed 0 0 time Fig On your graph, mark with the letter A a region where the acceleration is not constant. Mark with the letter B the region where the speed is constant. [4] [Total: 10] UCLES /31/M/J/09 [Turn over

6 6 4 (a) In an accident, a truck goes off the road and into a ditch. Two breakdown vehicles A and B are used to pull the truck out of the ditch, as shown in Fig road 45 A B breakdown vehicles ditch Fig. 4.1 UCLES /31/M/J/09

7 7 At one point in the rescue operation, breakdown vehicle A is exerting a force of 4000 N and breakdown vehicle B is exerting a force of 2000 N. (i) Using a scale of 1 cm = 500 N, make a scale drawing to show the resultant force on the truck. [4] your diagram to find the magnitude and direction of the resultant force on the truck. magnitude of resultant force =... direction of resultant force =... to direction of road [2] (b) (i) State why the resultant force is an example of a vector quantity.... [1] Give an example of a vector quantity that is not a force.... [1] UCLES /31/M/J/09 [Total: 8] [Turn over

8 8 5 A wind turbine has blades, which sweep out an area of diameter 25 m. 25 m blades Fig. 5.1 (a) The wind is blowing directly towards the wind turbine at a speed of 12 m / s. At this wind speed, 7500 kg of air passes every second through the circular area swept out by the blades. (i) Calculate the kinetic energy of the air travelling at 12 m / s, which passes through the circular area in 1 second. kinetic energy =... [3] The turbine converts 10% of the kinetic energy of the wind to electrical energy. Calculate the electrical power output of the turbine. State any equation that you use. power =... [3] UCLES /31/M/J/09

9 9 (b) On another day, the wind speed is half that in (a). (i) Calculate the mass of air passing through the circular area per second on this day. mass =... [1] Calculate the power output of the wind turbine on the second day as a fraction of that on the first day. fraction =... [3] [Total: 10] UCLES /31/M/J/09 [Turn over

10 10 6 (a) A man squeezes a pin between his thumb and finger, as shown in Fig finger pinhead pin thumb Fig. 6.1 The finger exerts a force of 84 N on the pinhead. The pinhead has an area of m 2. (i) Calculate the pressure exerted by the finger on the pinhead. pressure =... [2] State the value of the force exerted by the pin on the thumb.... [1] (iii) Explain why the pin causes more pain in the man s thumb than in his finger [2] UCLES /31/M/J/09

11 11 (b) The density of the water in a swimming pool is 1000 kg / m 3. The pool is 3 m deep. (i) Calculate the pressure of the water at the bottom of the pool. pressure =... [2] Another pool has the same depth of water, but has twice the area. State the pressure of the water at the bottom of this pool. pressure =... [1] [Total: 8] UCLES /31/M/J/09 [Turn over

12 12 7 (a) Some water is poured onto a plastic table-top, forming a puddle. The same volume of water is poured into a plastic dish, which is placed alongside the puddle. This is illustrated in Fig water in puddle water in dish Both lots of water begin to evaporate. Fig. 7.1 (i) In terms of the behaviour of molecules, describe what happens during the process of evaporation [2] Explain why the puddle dries out more rapidly than the water in the dish [2] (iii) State two changes that would make both lots of water evaporate more rapidly [2] UCLES /31/M/J/09

13 13 (b) In a place where refrigeration is not possible, a person attempts to keep a bottle of milk cool by using the procedure illustrated in Fig damp cloth bottle milk water bowl Fig. 7.2 Explain in terms of molecules why this procedure would be successful.... [3] [Total: 9] UCLES /31/M/J/09 [Turn over

14 In an optics lesson, a Physics student traces the paths of three rays of light near the boundary between medium A and air. The student uses a protractor to measure the various angles. Fig. 8.1 illustrates the three measurements air medium A ray air medium A ray 2 ray air medium A Fig. 8.1 UCLES /31/M/J/09

15 15 (a) State which is the optically denser medium, A or air, and how you can tell this.... [1] (b) State in which medium the light travels the faster, and how you know this.... [1] (c) State the critical angle of medium A....[1] (d) State the full name for what is happening to ray 3....[1] (e) The refractive index of medium A is Calculate the value of the angle of refraction of ray 1, showing all your working. (f) The speed of light in air is m / s. angle of refraction =... [2] Calculate the speed of light in medium A, showing all your working. speed of light =... [2] [Total: 8] UCLES /31/M/J/09 [Turn over

16 16 9 (a) Fig. 9.1 shows an a.c. supply connected in series to a diode and a resistor. Fig. 9.1 On the axes of Fig. 9.2, draw a graph showing the variation of the current in the resistor. [1] current 0 time Fig. 9.2 UCLES /31/M/J/09

17 17 (b) Fig. 9.3 shows four attempts, A, B, C and D, to connect a circuit known as a bridge rectifier. The circuit is connected to a 12 V a.c. supply. A B 12 V 12 V red black red black C D 12 V 12 V red black red black Fig. 9.3 (i) In which circuit will the direction of the conventional current in the resistor always be from red to black?... [1] On the circuit you chose in (b)(i), clearly indicate with arrows the path of the conventional current in the circuit when the upper terminal of the a.c. supply is positive with respect to the lower terminal. [2] [Total: 4] UCLES /31/M/J/09 [Turn over

18 18 10 The circuit shown in Fig uses a 12 V battery. 12 V A 16 Ω 8 Ω S Fig (a) Switch S is open, as shown in Fig State the value of (i) the reading on the ammeter, reading =... [1] the potential difference (p.d.) across S. p.d. =... [1] (b) Switch S is now closed. (i) Calculate the current in the ammeter. current =... [2] Calculate the p.d. across the 8 Ω resistor. p.d. =... [2] UCLES /31/M/J/09

19 19 (c) The two resistors are now connected in parallel. Calculate the new reading on the ammeter when S is closed, stating clearly any equations that you use. reading =... [4] [Total: 10] Question 11 is on the next page. UCLES /31/M/J/09 [Turn over

20 20 11 A beam of ionising radiation, containing α-particles, β-particles and γ-rays, is travelling left to right across the page. A magnetic field acts perpendicularly into the page. (a) In the table below, tick the boxes that describe the deflection of each of the types of radiation as it passes through the magnetic field. One line has been completed, to help you. not deflected deflected towards top of page deflected towards bottom of page large deflection small deflection α-particles β-particles γ-rays (b) An electric field is now applied, in the same region as the magnetic field and at the same time as the magnetic field. What is the direction of the electric field in order to cancel out the deflection of the α-particles?... [2] [3] [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 /31/M/J/09

21 UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education * * PHYSICS 0625/32 Paper 3 Extended May/June 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 20 printed pages. SPA SHW /08 T76321/3 UCLES 2009 [Turn over

22 2 1 A laboratory technician has ten pieces of plastic, all cut from the same thin sheet. The technician wishes to find the thickness of a piece of plastic as accurately as possible. (a) Name the instrument that should be used.... [1] (b) Describe how the instrument should be used to find the thickness.... [3] [Total: 4] UCLES /32/M/J/09

23 3 2 (a) A certain volume of water at room temperature and the same volume of ice in a freezer are each heated through the same temperature rise. Which of them will have the greater expansion, and why? Which?... Why?... [1] (b) strength, concrete pillars are usually reinforced with metal rods, which are embedded in the concrete before it sets. The list below shows how much a length of 1 m of each material expands when the temperature rises by 1 C. aluminium concrete steel 0.03 mm 0.01 mm 0.01 mm this information to decide which metal should be used to reinforce concrete, why it is suitable, and why the other metal is not suitable. Which metal should be used?... Why is it suitable?... Why is the other metal unsuitable? [3] [Total: 4] UCLES /32/M/J/09 [Turn over

24 4 3 A free-fall parachutist jumps out of an aeroplane, but doesn t open his parachute until after some time has elapsed. Fig. 3.1 shows the graph of his speed during the fall. speed A B C D 0 0 time Fig. 3.1 (a) What is the value of the acceleration of the parachutist immediately after he has jumped from the aeroplane?... [1] (b) How can you tell that the acceleration decreases until point A on the graph is reached?... [1] (c) State why the acceleration of the parachutist decreases until point A on the graph.... [2] (d) Consider section AB of the graph. (i) State what is happening to the parachutist s speed in this section.... [1] What can be said about the forces on the parachutist during this section? [1] UCLES /32/M/J/09

25 5 (e) At which point did the parachutist open his parachute?... [1] (f) Explain why the speed decreases from B to C.... [2] [Total: 9] UCLES /32/M/J/09 [Turn over

26 6 4 (a) In an accident, a truck goes off the road and into a ditch. Two breakdown vehicles A and B are used to pull the truck out of the ditch, as shown in Fig road 45 A B breakdown vehicles ditch Fig. 4.1 UCLES /32/M/J/09

27 7 At one point in the rescue operation, breakdown vehicle A is exerting a force of 4000 N and breakdown vehicle B is exerting a force of 2000 N. (i) Using a scale of 1 cm = 500 N, make a scale drawing to show the resultant force on the truck. [4] your diagram to find the magnitude and direction of the resultant force on the truck. magnitude of resultant force =... direction of resultant force =... to direction of road [2] (b) (i) State why the resultant force is an example of a vector quantity.... [1] Give an example of a vector quantity that is not a force.... [1] UCLES /32/M/J/09 [Total: 8] [Turn over

28 8 5 A wind turbine has blades, which sweep out an area of diameter 25 m. 25 m blades Fig. 5.1 (a) The wind is blowing directly towards the wind turbine at a speed of 12 m / s. At this wind speed, 7500 kg of air passes every second through the circular area swept out by the blades. (i) Calculate the kinetic energy of the air travelling at 12 m / s, which passes through the circular area in 1 second. kinetic energy =... [3] The turbine converts 10% of the kinetic energy of the wind to electrical energy. Calculate the electrical power output of the turbine. State any equation that you use. power =... [3] UCLES /32/M/J/09

29 9 (b) On another day, the wind speed is half that in (a). (i) Calculate the mass of air passing through the circular area per second on this day. mass =... [1] Calculate the power output of the wind turbine on the second day as a fraction of that on the first day. fraction =... [3] [Total: 10] UCLES /32/M/J/09 [Turn over

30 10 6 (a) A man squeezes a pin between his thumb and finger, as shown in Fig finger pinhead pin thumb Fig. 6.1 The finger exerts a force of 84 N on the pinhead. The pinhead has an area of m 2. (i) Calculate the pressure exerted by the finger on the pinhead. pressure =... [2] State the value of the force exerted by the pin on the thumb.... [1] (iii) Explain why the pin causes more pain in the man s thumb than in his finger [2] UCLES /32/M/J/09

31 11 (b) The density of the water in a swimming pool is 1000 kg / m 3. The pool is 3 m deep. (i) Calculate the pressure of the water at the bottom of the pool. pressure =... [2] Another pool has the same depth of water but has twice the area. State the pressure of the water at the bottom of this pool. pressure =... [1] [Total: 8] UCLES /32/M/J/09 [Turn over

32 12 7 (a) Some water is poured onto a plastic table-top, forming a puddle. The same volume of water is poured into a plastic dish, which is placed alongside the puddle. This is illustrated in Fig water in puddle water in dish Both lots of water begin to evaporate. Fig. 7.1 (i) In terms of the behaviour of molecules, describe what happens during the process of evaporation [2] Explain why the puddle dries out more rapidly than the water in the dish [2] (iii) State two changes that would make both lots of water evaporate more rapidly [2] UCLES /32/M/J/09

33 13 (b) In a place where refrigeration is not possible, a person attempts to keep a bottle of milk cool by using the procedure illustrated in Fig damp cloth bottle milk water bowl Fig. 7.2 Explain in terms of molecules why this procedure would be successful.... [3] [Total: 9] UCLES /32/M/J/09 [Turn over

34 In an optics lesson, a Physics student traces the paths of three rays of light near the boundary between medium A and air. The student uses a protractor to measure the various angles. Fig. 8.1 illustrates the three measurements air medium A ray air medium A ray 2 ray air medium A Fig. 8.1 UCLES /32/M/J/09

35 15 (a) State which is the optically denser medium, A or air, and how you can tell this.... [1] (b) State in which medium the light travels the faster, and how you know this.... [1] (c) State the critical angle of medium A....[1] (d) State the full name for what is happening to ray 3....[1] (e) The refractive index of medium A is Calculate the value of the angle of refraction of ray 1, showing all your working. (f) The speed of light in air is m / s. angle of refraction =... [2] Calculate the speed of light in medium A, showing all your working. speed of light =... [2] [Total: 8] UCLES /32/M/J/09 [Turn over

36 16 9 (a) Fig. 9.1 shows an a.c. supply connected in series to a diode and a resistor. Fig. 9.1 On the axes of Fig. 9.2, draw a graph showing the variation of the current in the resistor. [1] current 0 time Fig. 9.2 UCLES /32/M/J/09

37 17 (b) Fig. 9.3 shows four attempts, A, B, C and D, to connect a circuit known as a bridge rectifier. The circuit is connected to a 12 V a.c. supply. A B 12 V 12 V red black red black C D 12 V 12 V red black red black Fig. 9.3 (i) In which circuit will the direction of the conventional current in the resistor always be from red to black?... [1] On the circuit you chose in (b)(i), clearly indicate with arrows the path of the conventional current through the circuit when the upper terminal of the a.c. supply is positive with respect to the lower terminal. [2] [Total: 4] UCLES /32/M/J/09 [Turn over

38 18 10 The circuit shown in Fig uses a 12 V battery. A and B are identical lamps, each designed to work from a 6 V supply. 12 V S A B 18 Ω 18 Ω V Fig (a) Switch S is open, as shown in Fig (i) State the value of 1. the potential difference (p.d.) across S, p.d. =... [1] 2. the reading on the voltmeter. reading =... [1] Comment on the brightness of the two lamps.... [1] (b) Switch S is now closed. (i) State the new reading on the voltmeter. new reading =... [1] Comment on the brightness of the two lamps.... [1] (iii) Under these conditions, each lamp has a resistance of 18 Ω. Calculate the current in each lamp. UCLES /32/M/J/09 current =... [3]

39 19 (c) With switch S open, lamp B is connected in parallel with lamp A. With no current, each lamp has a resistance of 1.8 Ω. (i) Calculate the value of the combined resistance of A and B. combined resistance =... [2] State why it would not be wise to close S when A and B are connected in parallel [1] [Total: 11] Question 11 is on the next page. UCLES /32/M/J/09 [Turn over

40 20 11 A beam of ionising radiation, containing α-particles, β-particles and γ-rays, is travelling left to right across the page. A magnetic field acts perpendicularly into the page. (a) In the table below, tick the boxes which describe the deflection of each of the types of radiation as it passes through the magnetic field. One line has been completed, to help you. not deflected deflected towards top of page deflected towards bottom of page large deflection small deflection α-particles β-particles γ-rays (b) An electric field is now applied, in the same region as the magnetic field, and at the same time as the magnetic field. What is the direction of the electric field, in order to cancel out the deflection of the α- particles?... [2] [3] [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 /32/M/J/09

41 UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education * * PHYSICS 0625/32 Paper 3 Extended May/June 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) T49725/4 UCLES 2008 [Turn over

42 2 1 Fig. 1.1 shows the axes for a speed-time graph. 30 speed m / s time / s Fig. 1.1 (a) An object A falls freely from rest with the acceleration due to gravity (g = 10 m/s 2 ). It is not affected by air resistance. On Fig. 1.1, draw the graph of the motion of object A. [1] (b) Using your graph, or an alternative method, calculate the distance fallen in the first 2 s by object A in part (a). distance fallen =.... [2] (c) A second object B falls through the air from rest, but is affected by air resistance. It reaches a terminal velocity of 14 m/s. On Fig. 1.1, draw a possible graph for object B, including the region where it is travelling at terminal velocity. [1] UCLES /32/M/J/08

43 (d) (i) 3 Suggest a possible difference between objects A and B that could lead to B reaching a terminal velocity [1] Explain, in terms of the forces on B, why B reaches a terminal velocity [2] (e) Object A experiences a gravitational force of 2.0 N. (i) State the value of the weight of A. weight =.... [1] Calculate the mass of A. mass =.... [1] (f) Object A is floating in equilibrium on a liquid. State the value of the upward force of the liquid on A. upward force =... [1] [Total: 10] UCLES /32/M/J/08 [Turn over

44 4 2 (a) Name the process by which energy is released in the core of the Sun.... [1] (b) Describe how energy from the Sun becomes stored energy in water behind a dam.... [3] (c) Data for two small power stations is given in Table 2.1. input to power station output of power station gas-fired 100 MW 25 MW hydroelectric 90 MW 30 MW Table 2.1 (i) State what is meant by the efficiency of a power station [1] the data in Table 2.1 to explain that the hydroelectric station is more efficient than the gas-fired power station [1] [Total: 6] UCLES /32/M/J/08

45 5 3 A cyclist rides up and then back down the hill shown in Fig top of hill 14 m starting and finishing point Fig. 3.1 The cyclist and her bicycle have a combined mass of 90 kg. She pedals up to the top and then stops. She turns around and rides back to the bottom without pedalling or using her brakes. (a) Calculate the potential energy gained by the cyclist and her bicycle when she has reached the top of the hill. potential energy =... [2] (b) Calculate the maximum speed she could have when she arrives back at the starting point. speed =... [3] (c) Explain why her actual speed will be less than that calculated in (b).... [1] [Total: 6] UCLES /32/M/J/08 [Turn over

46 6 4 (a) One of the laws about the behaviour of gases states that a fixed amount of gas at constant temperature, the pressure is inversely proportional to the volume. In the space below, write an equation that represents this law. (b) Table 4.1 gives a series of pressures and their corresponding volumes, obtained in an experiment with a fixed amount of gas. The gas obeys the law referred to in (a). [1] pressure / kpa volume / cm Table 4.1 How do these figures indicate that the temperature was constant throughout the experiment?... [2] (c) Air is trapped by a piston in a cylinder. The pressure of the air is Pa. The distance from the closed end of the cylinder to the piston is 75 mm. The piston is pushed in until the pressure of the air has risen to Pa. Calculate how far the piston has moved. distance moved =.... [4] [Total: 7] UCLES /32/M/J/08

47 7 5 (a) Explain, in terms of molecules, how thermal expansion takes place in a solid and in a gas. solid... gas [4] (b) Complete Table 5.1 to show the relative expansion of equal volumes of liquids, gases and solids. Choose words from much less, slightly less, slightly more and much more. [2] state of matter expansion compared to solids, for the same temperature rise liquids gases Table 5.1 (c) Alcohol is often used in thermometers. State one property of alcohol that makes it suitable for use in thermometers.... [1] [Total: 7] UCLES /32/M/J/08 [Turn over

48 8 6 Fig. 6.1 shows an object, the tip of which is labelled O, placed near a lens L. The two principal foci of the lens are F 1 and F 2. L O F 2 F 1 Fig. 6.1 (a) On Fig. 6.1, draw the paths of two rays from the tip of the object so that they pass through the lens and continue beyond. Complete the diagram to locate the image of the tip of the object. Draw in the whole image and label it I. [2] (b) State two changes to the image when the object is moved (i) a small distance closer to the lens, [2] to a position between F 1 and the lens [2] [Total: 6] UCLES /32/M/J/08

49 9 7 Fig. 7.1 and Fig. 7.2 show wavefronts of light approaching a plane mirror and a rectangular glass block, respectively. direction of travel of wavefronts mirror Fig. 7.1 direction of travel of wavefronts glass block Fig. 7.2 (a) On Fig. 7.1 and on Fig. 7.2 draw wavefronts to show what happens after the waves strike the surface. [4] (b) In Fig. 7.2, the waves approaching the block have a speed of m/s and an angle of incidence of 70. The refractive index of the glass of the block is 1.5. (i) Calculate the speed of light waves in the block. speed =... [2] Calculate the angle of refraction in the block. angle =... [2] [Total: 8] UCLES /32/M/J/08 [Turn over

50 10 8 Fig. 8.1 is the plan of a small apartment that has four lamps as shown W living room 100 W kitchen 60 W bathroom Fig. 8.1 Power for the lamps is supplied at 200 V a.c. and the lamps are all in parallel. (a) In the space below, draw a lighting circuit diagram so that there is one switch for each room and one master switch that will turn off all the lamps. Label the lamps as 60 W or 100 W. (b) The 100 W lamp is switched on. Calculate [3] (i) the current in the lamp, current =... [2] the charge passing through the lamp in one minute. charge =... [2] UCLES /32/M/J/08

51 11 (c) The three 60 W lamps are replaced by three energy-saving ones, that give the same light output but are rated at only 15 W each. Calculate (i) the total reduction in power, reduction in power =... [1] the energy saved when the lamps are lit for one hour. energy saved =... [2] [Total: 10] UCLES /32/M/J/08 [Turn over

52 12 9 Fig. 9.1 shows apparatus used to investigate electromagnetic effects around straight wires. thin flexible wire T 3 T 1 thick rigid vertical wire large circular hole in card small circular hole in card T 4 T 2 Fig. 9.1 Fig. 9.2 is a view looking down on the apparatus shown in Fig Fig. 9.2 (a) A battery is connected to T 1 and T 2 so that there is a current vertically down the thick wire. On Fig. 9.2, draw three magnetic field lines and indicate, with arrows, the direction of all three. [2] (b) Using a variable resistor, the p.d. between terminals T 1 and T 2 is gradually reduced. State the effect, if any, that this will have on (i) the strength of the magnetic field,... [1] the direction of the magnetic field.... [1] UCLES /32/M/J/08

53 13 (c) The battery is now connected to terminals T 3 and T 4, as well as to terminals T 1 and T 2, so that there is a current down both wires. This causes the flexible wire to move. (i) Explain why the flexible wire moves [2] State the direction of the movement of the flexible wire.... [1] (iii) The battery is replaced by one that delivers a smaller current. State the effect that this will have on the force acting on the flexible wire [1] [Total: 8] UCLES /32/M/J/08 [Turn over

54 14 10 (a) In the space below, draw the symbol for a NOR gate. [1] (b) Describe the action of a NOR gate in terms of its inputs and output.... [2] UCLES /32/M/J/08

55 15 (c) A chemical process requires heating at low pressure to work correctly. When the heater is working, the output of a temperature sensor is high. When the pressure is low enough, a pressure sensor has a low output. Both outputs are fed into a NOR gate. A high output from the gate switches on an indicator lamp. (i) Explain why the indicator lamp is off when the process is working correctly [1] State whether the lamp is on or off in the following situations. 1. The pressure is low enough, but the heater stops working The heater is working, but the pressure rises too high.... [2] [Total: 6] UCLES /32/M/J/08 [Turn over

56 16 11 (a) Chlorine has two isotopes, one of nucleon number 35 and one of nucleon number 37. The proton number of chlorine is 17. Table 11.1 refers to neutral atoms of chlorine. Complete Table nucleon number 35 nucleon number 37 number of protons number of neutrons number of electrons Table 11.1 [3] (b) Some isotopes are radioactive. State the three types of radiation that may be emitted from radioactive isotopes [1] (c) (i) State one practical use of a radioactive isotope [1] Outline how it is used [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 /32/M/J/08

57 UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education * * PHYSICS 0625/03 Paper 3 Extended May/June 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 15 printed pages and 1 blank page. SPA (MML /06) T25815/6 UCLES 2007 [Turn over

58 1 Fig. 1.1 shows a model car moving clockwise around a horizontal circular track. 2 direction of movement model car P circular track Fig. 1.1 (a) A force acts on the car to keep it moving in a circle. (i) Draw an arrow on Fig. 1.1 to show the direction of this force. [1] The speed of the car increases. State what happens to the magnitude of this force.... [1] (b) (i) The car travels too quickly and leaves the track at P. On Fig. 1.1, draw an arrow to show the direction of travel after it has left the track. [1] In terms of the forces acting on the car, suggest why it left the track at P [2] UCLES /03/M/J/07

59 3 (c) The car, starting from rest, completes one lap of the track in 10 s. Its motion is shown graphically in Fig speed / cm / s time / s Fig. 1.2 (i) Describe the motion between 3.0 s and 10.0 s after the car has started.... [1] Fig. 1.2 to calculate the circumference of the track. circumference =... [2] (iii) Calculate the increase in speed per second during the time 0 to 3.0 s. increase in speed per second =... [2] [Total: 10] UCLES /03/M/J/07 [Turn over

60 2 Fig. 2.1 shows a steam safety valve. When the pressure gets too high, the steam lifts the weight W and allows steam to escape m W pivot force of steam Fig. 2.1 (a) Explain, in terms of moments of forces, how the valve works.... [2] (b) The moment of weight W about the pivot is 12 N m. The perpendicular distance of the line of action of the force of the steam on the valve from the pivot is 0.2 m. The area of the piston is m 2. Calculate (i) the minimum steam force needed for the steam to escape, force =... [2] the minimum steam pressure for the steam to escape. pressure =... [2] UCLES /03/M/J/07 [Total: 6]

61 3 A student wishes to work out how much power she uses to lift her body when climbing a flight of stairs. 5 Her body mass is 60 kg and the vertical height of the stairs is 3.0 m. She takes 12 s to walk up the stairs. (a) Calculate (i) the work done in raising her body mass as she climbs the stairs, work =... [2] the output power she develops when raising her body mass. (b) At the top of the stairs she has gravitational potential energy. power =... [2] Describe the energy transformations taking place as she walks back down the stairs and stops at the bottom.... [2] [Total: 6] UCLES /03/M/J/07 [Turn over

62 4 Fig. 4.1 shows a student s attempt to estimate the specific latent heat of fusion of ice by adding ice at 0 C to water at 20 C. The water is stirred continuously as ice is slowly added until the temperature of the water is 0 C and all the added ice has melted. 6 thermometer glass rod stirrer ice glass beaker water top-pan balance Fig. 4.1 (a) Three mass readings are taken. A description of the first reading is given. Write down descriptions of the other two. reading 1 the mass of the beaker + stirrer + thermometer reading 2... reading 3... [2] (b) Write down word equations which the student could use to find (i) the heat lost by the water as it cools from 20 C to 0 C,... [1] the heat gained by the melting ice.... [1] UCLES /03/M/J/07

63 7 (c) The student calculates that the water loses J and that the mass of ice melted is 30 g. Calculate a value for the specific latent heat of fusion of ice. specific latent heat of fusion =... [2] (d) Suggest two reasons why this value is only an approximate value. Reason 1... Reason [2] [Total: 8] UCLES /03/M/J/07 [Turn over

64 5 Fig. 5.1 shows some apparatus designed to compare the ability of two surfaces to absorb infra-red radiation. 8 surface painted dull black surface painted shiny white Bunsen burner Fig. 5.1 The containers, which are identical, are painted on the outside. One is dull black, the other is shiny white. Both are filled with water, initially at the same temperature. (a) (i) Describe how you would use the apparatus to compare the abilities of the two surfaces to absorb infra-red radiation [2] State the result that you would expect.... [1] (b) The thermometers used have high sensitivity and linear scales. (i) State what is meant by high sensitivity [1] Explain why a high sensitivity is important for this experiment [1] (iii) State what is meant by a linear scale [1] [Total: 6] UCLES /03/M/J/07

65 6 Fig. 6.1 shows a rectangular glass block ABCD. 9 F A 60 o E B D C Fig. 6.1 (a) The ray FE is partly reflected and partly refracted at E. (i) On Fig. 6.1, draw in the approximate path of the refracted ray, within and beyond the block. Label the ray refracted ray. [1] On Fig. 6.1, draw in the path of the reflected ray. Label the ray reflected ray. [1] (b) A second ray, almost parallel to AE, strikes the block at E and is partly refracted at an angle of refraction of 43. (i) State an approximate value for the angle of incidence at E.... [1] State an approximate value for the critical angle for the light in the glass block.... [1] (iii) Calculate an approximate value for the refractive index of the glass of the block. refractive index =... [2] (c) The speed of the light along ray FE is 3.0 x 10 8 m/s. Calculate the speed of the refracted light in the glass block. speed =... [2] [Total: 8] UCLES /03/M/J/07 [Turn over

66 7 Two students are asked to determine the speed of sound in air on the school playing fields. 10 (a) List the apparatus they need.... [1] (b) List the readings that the students need to take.... [1] (c) State how the speed of sound is calculated from the readings.... [1] (d) State one precaution that could be taken to improve the accuracy of the value obtained.... [1] (e) The table gives some speeds. speed/ m/s speed of sound in air speed of sound in water Place a tick in the table to show the speed which is closest to (i) the speed of sound in air, the speed of sound in water. [2] [Total: 6] UCLES /03/M/J/07

67 8 Fig. 8.1 shows part of a low-voltage lighting circuit containing five identical lamps V d.c. supply A B C D E Fig. 8.1 (a) Complete the circuit, by the addition of components as necessary, so that (i) (iii) the total current from the supply can be measured, the brightness of lamp E only can be varied, lamps C and D may be switched on and off together whilst lamps A, B and E remain on. [4] (b) All five lamps are marked 12 V, 36 W. Assume that the resistance of each lamp is the same fixed value regardless of how it is connected in the circuit. Calculate (i) the current in one lamp when operating at normal brightness, current =... [1] the resistance of one lamp when operating at normal brightness, resistance =... [1] (iii) the combined resistance of two lamps connected in parallel with the 12 V supply, resistance =... [1] (iv) the energy used by one lamp in 30 s when operating at normal brightness. energy =... [1] UCLES /03/M/J/07 [Turn over

68 12 (c) The whole circuit is switched on. Explain why the brightness of lamps A and B is much less than that of one lamp operating at normal brightness.... [2] [Total: 10] 9 Fig. 9.1 is a sketch of some apparatus, found in a Science museum, which was once used to show how electrical energy can be converted into kinetic energy. When the switch is closed the wheel starts to turn. switch metal supports + d.c. supply S N S N magnet metal spoked wheel small dish of mercury magnet wood base Fig. 9.1 (a) Explain why the wheel turns when the switch is closed.... [2] (b) On Fig. 9.1, draw an arrow to show the direction of rotation of the wheel. [1] UCLES /03/M/J/07

69 (c) The d.c. motor is another way to convert electrical energy into kinetic energy. 13 In the space below, draw a labelled diagram of a d.c. motor. [3] (d) Describe how the split-ring commutator on an electric motor works.... [2] [Total: 8] UCLES /03/M/J/07 [Turn over

70 10 Fig shows a circuit based on a transistor and a thermistor. 14 R 2 power supply R 1 Fig (a) Describe the action of the thermistor in this circuit.... [3] (b) State and explain how the circuit may be modified so that the lamp switches on at a different temperature.... [2] (c) State one practical use of this circuit.... [1] UCLES /03/M/J/07

71 11 Fig shows the paths of three α-particles moving towards a thin gold foil. 15 gold foil A B C Fig Particle A is moving directly towards a gold nucleus. Particle B is moving along a line which passes close to a gold nucleus. Particle C is moving along a line which does not pass close to a gold nucleus. (a) On Fig. 11.1, complete the paths of the α-particles A, B and C. [3] (b) State how the results of such an experiment, using large numbers of α-particles, provides evidence for the existence of nuclei in gold atoms.... [3] [Total: 12] UCLES /03/M/J/07

72 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/M/J/07

73 UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education PHYSICS Paper 3 Extended 0625/03 May/June 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 12 printed pages. SP (SLM/KS) T04130/2 UCLES 2006 [Turn over

74 2 1 A bus travels from one bus stop to the next. The journey has three distinct parts. Stated in order they are uniform acceleration from rest for 8.0 s, uniform speed for 12 s, non-uniform deceleration for 5.0 s. Fig. 1.1 shows only the deceleration of the bus. speed m/s time/s Fig. 1.1 (a) On Fig. 1.1, complete the graph to show the first two parts of the journey. [3] (b) Calculate the acceleration of the bus 4.0 s after leaving the first bus stop. acceleration =...[2] (c) the graph to estimate the distance the bus travels between 20 s and 25 s. estimated distance =...[2] (d) On leaving the second bus stop, the uniform acceleration of the bus is 1.2 m / s 2. The mass of the bus and passengers is 4000 kg. Calculate the accelerating force that acts on the bus. UCLES /03/M/J/06 force =...[2] (e) The acceleration of the bus from the second bus stop is less than that from the first bus stop. Suggest two reasons for this [2]

75 3 2 A student sets up the apparatus shown in Fig. 2.1 in order to find the resultant of the two tensions T 1 and T 2 acting at P. When the tensions T 1, T 2 and T 3 are balanced, the angles between T 1 and the vertical and T 2 and the vertical are as marked on Fig pulley pulley T 1 = 6.0 N T 2 = 8.0 N vertical board P T 3 Fig. 2.1 In the space below, draw a scale diagram of the forces T 1 and T 2. the diagram to find the resultant of the two forces. State (a) the scale used, scale =... (b) the value of the resultant, value =... (c) the direction of the resultant. direction =... [6] UCLES /03/M/J/06 [Turn over

76 4 3 An electric pump is used to raise water from a well, as shown in Fig pump ground well Fig. 3.1 (a) The pump does work in raising the water. State an equation that could be used to calculate the work done in raising the water....[2] (b) The water is raised through a vertical distance of 8.0 m. The weight of water raised in 5.0 s is 100 N. (i) Calculate the work done in raising the water in this time. work done =...[1] Calculate the power the pump uses to raise the water. power =...[1] (iii) The energy transferred by the pump to the water is greater than your answer to (i). Suggest what the additional energy is used for....[1] UCLES /03/M/J/06

77 5 4 (a) State two differences between evaporation of water and boiling of water [2] (b) The specific latent heat of vaporisation of water is 2260 kj / kg. Explain why this energy is needed to boil water and why the temperature of the water does not change during the boiling....[3] (c) A laboratory determination of the specific latent heat of vaporisation of water uses a 120 W heater to keep water boiling at its boiling point. Water is turned into steam at the rate of g / s. Calculate the value of the specific latent heat of vaporisation obtained from this experiment. Show your working. specific latent heat of vaporisation =...[3] UCLES /03/M/J/06 [Turn over

78 6 5 (a) Fig. 5.1 shows a tank used for evaporating salt solution to produce crystals. evaporating tank salt solution steam in steam out Fig. 5.1 Suggest two ways of increasing the rate of evaporation of the water from the solution. Changes may be made to the apparatus, but the rate of steam supply must stay constant. You may assume the temperature of the salt solution remains constant [2] (b) A manufacturer of liquid-in-glass thermometers changes the design in order to meet new requirements. Describe the changes that could be made to (i) give the thermometer a greater range,...[1] make the thermometer more sensitive....[1] (c) A toilet flush is operated by the compression of air. The air inside the flush has a pressure of Pa and a volume of 150 cm 3. When the flush is operated the volume is reduced to 50 cm 3. The temperature of the air remains constant during this process. Calculate the new pressure of the air inside the flush. pressure =...[2] UCLES /03/M/J/06

79 7 6 Fig. 6.1 shows white light incident at P on a glass prism. Only the refracted red ray PQ is shown in the prism. white light P red ray Q screen Fig. 6.1 (a) On Fig. 6.1, draw rays to complete the path of the red ray and the whole path of the violet ray up to the point where they hit the screen. Label the violet ray. [3] (b) The angle of incidence of the white light is increased to 40. The refractive index of the glass for the red light is Calculate the angle of refraction at P for the red light. angle of refraction =...[3] (c) State the approximate speed of (i) the white light incident at P, speed =...[1] the red light after it leaves the prism at Q. speed =...[1] UCLES /03/M/J/06 [Turn over

80 8 7 Fig. 7.1 shows how the air pressure at one instant varies with distance along the path of a continuous sound wave. air pressure normal P X Y air pressure distance in direction of travel of the wave (a) What type of waves are sound waves? Fig [1] (b) On Fig. 7.1, mark on the axis PY (i) one point C where there is a compression in the wave, [1] one point R where there is a rarefaction in the wave. [1] (c) Describe the motion of a group of air particles situated on the path of the wave shown in Fig [2] (d) The sound wave shown has speed of 340 m / s and a frequency of 200 Hz. Calculate the distance represented by PX on Fig distance =...[2] UCLES /03/M/J/06