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 0625/33 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 pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. Electronic calculators may be used. You may lose marks if you do not show your working or if you do not use appropriate units. Take the weight of 1 kg to be 10 N (i.e. acceleration of free fall = 10 m / s 2 ). At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question Total This document consists of 16 printed pages. DC (NF/CGW) 58581/5 [Turn over

2 2 1 A train is at rest in a railway station. At time t = 0, the train starts to move forwards with an increasing speed until it reaches its maximum speed at time t = 48 s. Fig. 1.1 is the speed-time graph for the first 48 s of the journey speed m / s time / s 120 Fig. 1.1 (a) (i) State how the graph shows that, during the first 48 s of the journey, the acceleration of the train is constant [1] Calculate the acceleration of the train during the first 48 s of the journey. acceleration =... [2] (b) After time t = 48 s, the train continues at its maximum speed for another 72 s. (i) On Fig. 1.1, sketch the speed-time graph for the next 72 s of the journey. [1] Determine the total distance travelled by the train in the 120 s after it starts moving. distance =... [3] [Total: 7] 0625/33/M/J/13

3 3 2 Water is stored in a reservoir at an average vertical height of 350 m above the turbines of a hydroelectric power station. During a 7.0 hour period, m 3 of water flows down from the reservoir to the turbines. (a) The density of water is 1000 kg / m 3. this 7.0 hour period, calculate (i) the mass of water that flows from the reservoir to the turbines, mass =... [2] the gravitational potential energy transformed as the water flows to the turbines, energy =... [2] (iii) the maximum possible average output power. power =... [2] (b) A hydroelectric power station generates electricity from a renewable energy source. (i) Explain what is meant, in this context, by renewable [1] State two other renewable energy sources [2] [Total: 9] 0625/33/M/J/13 [Turn over

4 4 3 On a windy day, a parachutist of mass 85 kg jumps from an aeroplane. Fig. 3.1 shows the parachutist falling through the air at a constant vertical velocity of 8.4 m / s downwards. 8.4 m / s Fig. 3.1 (a) Distinguish between speed and velocity.... [1] 0625/33/M/J/13

5 5 (b) As the parachutist falls, the wind is moving him towards the right of the diagram, at a horizontal velocity of 6.3 m / s. (i) On Fig. 3.1, draw an arrow to show the horizontal velocity of the parachutist. [1] On the grid below, draw a vector diagram to determine graphically the size and direction of the resultant velocity of the parachutist. size =... direction =... [4] (iii) Calculate the kinetic energy of the parachutist. kinetic energy =... [3] [Total: 9] 0625/33/M/J/13 [Turn over

6 6 4 A large crane has a mass of 8500 kg. Fig. 4.1 shows the crane on a muddy building-site. lifting-arm hook caterpillar tracks axle Fig. 4.1 (a) Calculate the weight of the crane. weight =... [1] (b) The crane rests on two caterpillar tracks each of which has a contact area with the ground of 3.4 m 2. (i) Calculate the pressure that the crane exerts on the ground. pressure =... [2] As the crane driver walks towards the crane, he starts to sink into the mud. He lays a wide plank of wood on the mud and he walks along the plank. Explain why he does not sink into the mud when he walks along the plank [2] 0625/33/M/J/13

7 7 (c) When the crane lifts a heavy load with its hook, the load exerts a moment on the lifting-arm about the axle. (i) Explain what is meant by moment of a force [1] Despite the moment exerted on the lifting-arm, the crane remains in equilibrium. State the two conditions required for any object to be in equilibrium [2] [Total: 8] 0625/33/M/J/13 [Turn over

8 8 5 Fig. 5.1 shows a saucepan of boiling water on an electric hotplate. Fig. 5.1 As time passes, thermal energy (heat) is constantly supplied to the water but its temperature remains at 100 C. (a) State two ways in which boiling differs from evaporation [2] (b) Explain, in terms of the water molecules, what happens to the thermal energy supplied to the water as it boils.... [2] 0625/33/M/J/13

9 9 (c) Describe an experiment to measure the specific latent heat of steam. You may include a diagram.... [4] [Total: 8] 0625/33/M/J/13 [Turn over

10 10 6 (a) (i) State two ways in which the molecular structure of a gas differs from the molecular structure of a liquid [2] Compressibility is the ease with which a substance can be compressed. State and explain, in terms of the forces between the molecules, how the compressibility of a gas differs from that of a liquid [2] (b) Fig. 6.1 shows a weather balloon being inflated by helium from a cylinder. HELIUM Fig. 6.1 (i) The helium that inflates the balloon had a volume of m 3 at a pressure of Pa, inside the cylinder. The pressure of the helium in the balloon is Pa and its temperature is the same as it was when in the cylinder. Calculate the volume occupied by the helium in the balloon. volume =... [3] As the balloon rises up through the atmosphere, the temperature of the helium decreases. State the effect of this temperature change on the helium molecules [1] 0625/33/M/J/13 [Total: 8]

11 11 7 The frequency of the monochromatic light produced by a laser is Hz. A ray of light from the laser passes from a vacuum, where the speed of light is m / s, into a fibre-optic cable. (a) State (i) what is meant by monochromatic, [1] the frequency of light from the laser in the fibre-optic cable.... [1] (b) The speed of light in the fibre-optic cable is m / s. Calculate (i) the refractive index of the material from which fibre-optic cable is made, refractive index =... [2] the wavelength of light from the laser in the fibre-optic cable. wavelength =... [2] [Total: 6] 0625/33/M/J/13 [Turn over

12 12 8 Fig. 8.1 shows a small, uncharged copper sphere suspended from a nylon thread, and a plastic rod being rubbed with a woollen cloth. nylon thread plastic rod copper sphere woollen cloth Fig. 8.1 The rod becomes negatively charged as it is rubbed. (a) Explain, in terms of electrons, why copper is a conductor but nylon is an insulator.... [2] (b) Describe how the negatively charged rod may be used to induce a positive charge on the copper sphere.... [3] (c) The copper sphere is given a positive charge, as shown in Fig Fig. 8.2 On Fig. 8.2, draw arrows to indicate the direction and pattern of the electric field that surrounds the positively charged sphere. [2] 0625/33/M/J/13 [Total: 7]

13 13 9 In a laboratory experiment, the isotope uranium-238 is used as a source of α-particles. (a) State (i) one feature of uranium-238 nuclei that is the same for the nuclei of other uranium isotopes,... [1] one feature of uranium-238 nuclei that is different for the nuclei of other uranium isotopes.... [1] (b) Fig. 9.1 shows the α-particles from the uranium source being directed at a very thin gold foil, in a vacuum. thin gold foil moveable -particle detector uranium source -particles vacuum Fig. 9.1 To investigate the scattering of α-particles, a detector is moved to different positions around the very thin gold foil and measurements are recorded. Describe the results from this scattering experiment and explain what they show about the structure of atoms.... [4] [Total: 6] 0625/33/M/J/13 [Turn over

14 14 10 Fig is the symbol for a NAND gate with inputs A and B. input A output input B Fig (a) Input A and input B can be set to 1 (high) or to 0 (low). Complete the table below to give the outputs for this NAND gate. input A input B output (b) The two inputs of the NAND gate are joined together and connected to an input C, as shown in Fig [1] input C output Fig (i) Determine the output of this NAND gate when 1. input C is set to 0, output = input C is set to 1. output =... [1] State the name of the logic gate that behaves in the same way as the NAND gate in Fig [1] 0625/33/M/J/13

15 15 (c) A circuit combines three NAND gates. The inputs to the circuit are P and Q, as shown in Fig P Q R S T Fig Points R, S and T in the circuit are also labelled. Input P is set to 0 and input Q is set to 1. Determine the logic states (0 or 1) of points R, S and T. point R =... point S =... point T =... [2] [Total: 5] Turn over for Question /33/M/J/13 [Turn over

16 16 11 A remote ski lodge receives 18 kw of electric power from a 120 V supply. (a) Calculate (i) the current that the ski lodge draws from the supply, current =... [2] the electrical energy supplied to the ski lodge in 30 minutes. energy =... [2] (b) The power supply to the ski lodge is from a nearby transformer that is connected to long-distance transmission cables. The voltage of the transmission cables is very much larger than 120 V. Explain why energy losses in the transmission cables are lower when the voltage is high.... [3] [Total: 7] 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. 0625/33/M/J/13

17 Cambridge International Examinations Cambridge 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 an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. Electronic calculators may be used. You may lose marks if you do not show your working or if you do not use appropriate units. Take the weight of 1 kg to be 10 N (i.e. acceleration of free fall = 10 m / 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. The syllabus is approved for use in England, Wales and Northern Ireland as a Cambridge International Level 1/Level 2 Certificate. This document consists of 16 printed pages. DC (NF/JG) 81774/2 UCLES 2014 [Turn over

18 2 1 (a) State the two conditions necessary for a system of forces acting on a body to be in equilibrium [2] (b) Fig. 1.1 shows a loaded wheelbarrow held in equilibrium by a gardener. The wheel of the wheelbarrow is in contact with the ground at point C. P Q W C Fig. 1.1 In Fig. 1.1, there are three vertical forces acting on the wheelbarrow. P is the upward force applied by the gardener. Q is the upward force of the ground on the wheel at point C. W is the weight of the wheelbarrow and its contents. Explain why the force P is less than the force W (i) by considering the forces P, Q and W,.... [2] by considering the moments of the forces P and W about point C..... [2] UCLES /32/O/N/14

19 3 (c) Fig. 1.2 shows a kitchen cupboard resting on a support and attached to a wall by a screw. wall screw F cupboard 0.75 m G support P 0.24 m 75 N Fig. 1.2 The weight of the cupboard and its contents is 75 N. G is the position of the centre of mass of the cupboard. The clockwise and anticlockwise moments about point P are equal. Calculate the force F exerted by the screw. F =... [3] [Total: 9] UCLES /32/O/N/14 [Turn over

20 4 2 Fig. 2.1 shows a tanker lorry full of liquid. CIEliquids Fig. 2.1 The tanker delivers the liquid and drives away empty. (a) (i) Compare the acceleration of the empty tanker with the acceleration of the full tanker for the same resultant force. Tick one box. acceleration of full tanker is less than acceleration of empty tanker acceleration of full tanker is the same as acceleration of empty tanker acceleration of full tanker is more than acceleration of empty tanker [1] Explain your answer [2] (b) The empty tanker has a weight of N. The forward force is 6000 N and the total resistive force is 2000 N. Calculate the acceleration. acceleration =... [3] [Total: 6] UCLES /32/O/N/14

21 3 Fig. 3.1 shows the speed- time graph of a firework rocket as it rises and then falls to the ground. 5 rocket moving upwards A speed 0 0 B E time rocket moving downwards C D Fig. 3.1 The rocket runs out of fuel at A. It reaches its maximum height at B. At E it returns to the ground. (a) (i) State the gradient of the graph at B. gradient =... [1] State why the gradient has this value at B..... [1] (b) State and explain the relationship between the shaded areas above and below the time axis [3] (c) Another rocket, of the same size and mass, opens a parachute at point B. On Fig. 3.1, sketch a possible graph of its speed from B until it reaches the ground. [3] [Total: 8] UCLES /32/O/N/14 [Turn over

22 4 Fig. 4.1 shows a small wind-turbine used to generate electricity. 6 The wind-turbine drives an electric generator. Fig. 4.1 The wind blows with a velocity of 7.0 m / s at right angles to the plane of the turbine. The mass of air passing per second through the turbine is 6.7 kg. (a) (i) Calculate the kinetic energy of the air blown through the turbine per second. kinetic energy =... [2] Only 8% of this energy is converted to electrical energy. Calculate the power output of the electric generator. power output =... [2] UCLES /32/O/N/14

23 7 (b) The volume of air passing through the turbine each second is 5.6 m 3 (flow rate is 5.6 m 3 / s). Calculate the density of the air. density of air =... [2] (c) The turbine turns a generator. Describe the essential action within the generator that produces electricity [2] [Total: 8] UCLES /32/O/N/14 [Turn over

24 8 5 (a) In the box below, sketch a diagram to represent the molecular structure of a liquid. Show the molecules as small circles of equal size. (b) A teacher in a school laboratory pours liquid ethanol from a bottle into a glass dish. The glass dish rests on an electronic balance. Although the temperature of the laboratory is below the boiling point of ethanol, the mass of ethanol in the dish quickly decreases as ethanol evaporates. [2] (i) State the effect of this evaporation on the temperature of the remaining ethanol.... [1] Explain, in terms of the ethanol molecules, why this is happening..... [1] (iii) The specific latent heat of vaporisation of ethanol is 850 J / g. Calculate the thermal energy required to evaporate 3.4 g of ethanol. thermal energy =... [2] (iv) Suggest two ways in which the rate of evaporation of ethanol from the dish can be reduced [2] [Total: 8] UCLES /32/O/N/14

25 9 6 A technician is designing a liquid-in-glass thermometer. The following is a list of properties of the thermometer that she is considering. sensitivity range speed of response linearity (a) (i) 1. Which one of these properties is affected by the length of the stem of the thermometer? Explain your answer [2] 1. Which property is affected by the diameter of the capillary? Explain your answer [2] (b) The thermometer is to be used to measure temperatures between 10 C and 50 C. The technician considers using water or red-coloured alcohol as the liquid in the thermometer. (i) Write down which liquid would be suitable.. Give two reasons for your answer [2] [Total: 6] UCLES /32/O/N/14 [Turn over

26 10 7 (a) A police car siren emits sound waves that vary in pitch. Tick two boxes that apply to the sound waves emitted by the siren. electromagnetic longitudinal transverse visible frequency Hz frequency Hz frequency Hz [2] (b) Fig. 7.1 is a top view of one wavefront of a water wave before it strikes a hard boundary. boundary direction of travel of wavefront wavefront Fig. 7.1 (i) Name the process that occurs as the wavefront strikes the boundary.... [1] UCLES /32/O/N/14

27 11 Explain, in terms of wave theory, what occurs as the wavefront strikes the boundary [2] (iii) State whether there is an increase, a decrease or no change in the wavelength of the wave after it strikes the boundary.... [1] (iv) The speed of the wave is 3.0 m / s and its wavelength 7.0 cm. Calculate the frequency of the wave. frequency =... [2] [Total: 8] UCLES /32/O/N/14 [Turn over

28 12 8 (a) Fig. 8.1 shows two resistors X and Y in series. I X R Y 2R Fig. 8.1 Complete the table below, using only the symbols I and R, alone or in combination. resistor resistance current potential difference power X R I I 2 R Y 2R 2IR (b) Fig. 8.2 represents the system used to transmit electricity from a power station to a factory. [3] 750 A power line V power station factory power line Fig. 8.2 The power station generates V and supplies a current of 750 A. The total resistance of the power lines between the power station and the factory is 1.5 Ω. Calculate (i) the power output of the power station, power =... [1] UCLES /32/O/N/14

29 13 the potential difference across the 1.5 Ω of the power lines, potential difference =... [1] (iii) the power supplied to the factory. power =... [3] [Total: 8] UCLES /32/O/N/14 [Turn over

30 9 A transformer is used to reduce the voltage of a supply from 120 V a.c. to 12 V a.c. 14 (a) Explain how a transformer works. Your answer should include an explanation of why a transformer would not work with a d.c. supply voltage [3] (b) The output current is 1.2 A. (i) Calculate the input current. input current =... [2] State an assumption you made in your calculation for (b)(i)..... [1] [Total: 6] UCLES /32/O/N/14

31 15 10 (a) A technician sets up a radiation detector in a university laboratory for use in a class experiment. (i) A radioactive source that emits β-particles is placed on the laboratory bench, 10 cm from the detector. A small count rate is registered. 1. State the name of the particle, found in an atom, that is identical to a β-particle.... [1] 2. The technician sets up the same equipment in the same way every year. He notices that the count rate registered by the detector every year is slightly smaller than it was the previous year. Suggest why this is so [2] In a second experiment, the same equipment is set up but a radioactive source that emits α-particles is placed 10 cm from the detector. The same number of particles are emitted every second from this source as were emitted from the β-source in (i). Explain why the count rate obtained is much lower [2] (b) In another experiment, β-particles pass between two parallel, horizontal metal plates in a vacuum. They then continue to the detector as shown in Fig metal plate particles source detector metal plate Fig A very high p.d. is connected between the plates, with the lower plate positive. On Fig. 10.1, sketch the new path of the β-particles. [2] [Total: 7] UCLES /32/O/N/14 [Turn over

32 11 Fig shows part of the path of a ray of light PQ travelling in an optical fibre. 16 Q glass P Fig (a) On Fig. 11.1, carefully complete the path of the ray of light, until it leaves this section of the optical fibre. [2] (b) The material of an optical fibre has a refractive index of Calculate the critical angle. critical angle =...[2] (c) (i) State what sort of reflection takes place within an optical fibre.... [1] Explain your answer..... [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. 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/O/N/14

33 UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education * * PHYSICS 0625/06 Paper 6 Alternative to Practical October/November 2009 Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST 1 hour 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. 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. DCA (SHW /08) 12805/3 UCLES 2009 [Turn over

34 2 1 The IGCSE class is investigating the period of oscillation of a simple pendulum. Fig. 1.1 shows the set-up. bob d floor one complete oscillation Fig. 1.1 Fig. 1.2 (a) (i) On Fig. 1.1, measure the vertical distance d from the floor to the bottom of the pendulum bob. d =... Fig. 1.1 is drawn one twentieth actual size. Calculate the actual distance x from the floor to the bottom of the pendulum bob. Enter this value in the top row of Table 1.1. The students displace the pendulum bob slightly and release it so that it swings. They measure and record in Table 1.1 the time t for 20 complete oscillations of the pendulum (see Fig. 1.2). Table 1.1 x / cm t / s T / s T 2 / s [4] UCLES /06/O/N/09

35 (b) (i) 3 Calculate the period T of the pendulum for each set of readings. The period is the time for one complete oscillation. Enter the values in Table 1.1. Calculate the values of T 2. Enter the T 2 values in Table 1.1. (c) your values from Table 1.1 to plot a graph of T 2 / s 2 (y-axis) against x / cm (x-axis). Draw the best-fit line. [5] UCLES /06/O/N/09 [Turn over

36 4 (d) State whether or not your graph shows that T 2 is directly proportional to x. Justify your statement by reference to the graph. statement... justification [1] [Total: 10] UCLES /06/O/N/09

37 5 BLANK PAGE 0625/06/O/N/09 [Turn over

38 6 2 An IGCSE student is investigating the cooling of thermometer bulbs under different conditions. He places a thermometer in a beaker of hot water and records the temperature θ h of the hot water C Fig. 2.1 (a) Fig. 2.1 shows the thermometer. Write down the value of θ h that it shows. θ h... [1] He then moves the thermometer until the thermometer bulb is just above the surface of the water (position A) and immediately starts a stopclock. He records the time t and the temperature reading θ every 30 s. The readings are shown in Table 2.1. Table 2.1 Position A Position B t / θ / θ / (b) Complete the column headings in the table. [1] UCLES /06/O/N/09

39 7 The student replaces the thermometer in the hot water and then moves the thermometer 15 cm away from the beaker to position B and immediately starts the stopclock. He records the time t and the temperature reading θ every 30 s. The readings are shown in Table 2.1. (c) State in which position the thermometer bulb cooled more quickly. Justify your answer by reference to the readings. statement... justification [1] (d) To make a fair comparison between the rates of cooling of the thermometer bulbs in the two positions, it is important to control other experimental conditions. Suggest two conditions that should be controlled in this experiment [2] [Total: 5] UCLES /06/O/N/09 [Turn over

40 8 3 The IGCSE class is comparing the combined resistance of lamps arranged either in series or in parallel. The circuit shown in Fig. 3.1 is used. power source A V Fig. 3.1 A student measures and records the current I in the circuit and the p.d. V across the two lamps. Fig. 3.2 shows the readings on the two meters A V Fig. 3.2 UCLES /06/O/N/09

41 9 (a) (i) Write the voltage and current readings in Table 3.1, below. Complete the column headings in Table 3.1. [3] (b) The student then sets up the circuit shown in Fig. 3.3 and records the readings. These readings have already been entered in Table 3.1. power source A V Fig. 3.3 each set of readings in the table, calculate the combined resistance R of the two lamps using the equation R = V / I. Record the values of R in Table 3.1. [2] Table 3.1 Circuit of Fig. 3.1 V / I / R / Circuit of Fig (c) Using the values of resistance you have obtained, calculate the ratio y of the resistances using the equation y = resistance of lamps in series resistance of lamps in parallel. y =... [2] UCLES /06/O/N/09 [Turn over

42 10 (d) Fig. 3.4 shows a circuit including two motors A and B. power source A ammeter motor A motor B variable resistor Fig. 3.4 (i) Draw a diagram of the circuit using standard circuit symbols. The circuit symbol for a motor is: M UCLES /06/O/N/09

43 11 An engineer wishes to measure the voltage across motor A. 1. On Fig. 3.4, mark with the letters X and Y where the engineer should connect the voltmeter. 2. State the purpose of the variable resistor [3] [Total: 10] UCLES /06/O/N/09 [Turn over

44 12 4 An IGCSE student is determining the focal length of a lens by two different methods. The set-up for Method 1 is shown in Fig illuminated object object screen f mirror lens Fig. 4.1 The student moves the lens and the mirror slowly towards the object screen until a sharply focused image is obtained on the object screen as shown in Fig image Fig. 4.2 (a) On Fig. 4.1, use your rule to measure the distance f between the lens and the object screen. This is the focal length of the lens. f =... [2] (b) Method 2, the student takes measurements of the diameter d and maximum thickness t of the lens. your rule to take measurements on Fig Fig. 4.3 UCLES /06/O/N/09

45 (i) 13 Determine an average value for the diameter d of the lens. Record your readings in the space below. (iii) Measure the maximum thickness t of the lens. d =... t =... Draw a diagram to show how, in the laboratory you would use two rectangular blocks of wood and a metre rule to measure the thickness of the lens as accurately as possible. (iv) Theory shows that, for a perfectly formed lens, the focal length is given by the formula f = d 2 where k = kt Calculate the focal length f of the lens using this formula. f =... [7] UCLES /06/O/N/09 [Turn over

46 14 (c) Explain whether your results from Methods 1 and 2 support the theory in part (b)(iv).... [1] [Total: 10] UCLES /06/O/N/09

47 15 5 An IGCSE student is carrying out an optics experiment. The experiment involves using a lens to focus the image of an illuminated object onto a screen. (a) Complete the diagram below to show the apparatus you would use. Include a metre rule to measure the distances between the object and the lens and between the lens and the screen. The illuminated object is drawn for you. illuminated object lamp card [3] (b) State two precautions that you would take to obtain accurate results in this experiment [2] [Total: 5] UCLES /06/O/N/09

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 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. 0625/06/O/N/09

49 UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education * * PHYSICS 0625/63 Paper 6 Alternative to Practical May/June hour Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use a pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. Electronic calculators may be used. You may lose marks if you do not show your working or if you do not use appropriate units. 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. DC (KN/SW) 58836/7 [Turn over

50 2 1 Some IGCSE students are investigating the cooling of water. Fig. 1.1 shows how the apparatus is set up. thermometers stand hot water Fig. 1.1 (a) A thermometer is placed on the bench so that room temperature can be measured. Read and record room temperature θ R as shown on the thermometer in Fig θ R =...[1] C Fig. 1.2 (b) A student pours hot water into the beaker so that the level is as shown in Fig In Table 1.1, he then records the temperatures θ every minute as the water cools until time t = 6 minutes. Complete the column headings and complete the time column in Table 1.1. [2] 0625/63/M/J/13

51 3 Table 1.1 thermometer bulb near the bottom of the beaker thermometer bulb near the surface of the water t / θ / θ / (c) State in which position of the thermometer bulb the average rate of cooling is the greater. Justify your answer by referring to the results. position... justification... [2] (d) What precaution do the results suggest should be taken when measuring the temperature of a liquid? Explain how the results show that this is a sensible precaution. precaution... explanation... [2] 0625/63/M/J/13 [Turn over

52 4 (e) A student in a different school wants to repeat the experiment in order to check the results. Suggest two experimental conditions which should be kept the same [2] [Total: 9] 0625/63/M/J/13

53 5 2 The IGCSE class is investigating the oscillation of a pendulum. The apparatus is set up as shown in Fig clamp bob h one complete oscillation Fig. 2.1 Fig. 2.2 The height h of the pendulum bob above the bench is measured and recorded. This is repeated, to obtain a total of five different values of h, by shortening the string of the pendulum but without changing the height of the clamp. each value of h, the pendulum bob is pulled to one side by a small distance, as shown in Fig The pendulum is then released and the time t for 10 complete oscillations is measured and recorded. (a) Describe a precaution which the IGCSE students might have taken in order to measure h as accurately as possible. You may draw a diagram....[1] 0625/63/M/J/13 [Turn over

54 6 (b) Figs. 2.3 to 2.7 are scale diagrams showing the height h of the pendulum bob above the bench for each of the five experiments. bench Fig. 2.3 Fig. 2.4 Fig. 2.5 Fig. 2.6 Fig. 2.7 (i) Measure, and record in Table 2.1, the height h in each experiment. The diagrams are drawn to 1/5 scale. Calculate, and record in Table 2.1, the actual heights H of the pendulum bob above the bench. [2] Table 2.1 h /cm H /cm t /s T /s T 2 /s 2 Fig Fig Fig Fig Fig /63/M/J/13

55 7 (c) (i) each value of height h, calculate the time T for one complete oscillation, using the equation T = t. Record these values in Table Calculate the values of T 2 and record these in the table. [1] (d) Plot a graph of T 2 / s 2 (y-axis) against H / cm (x-axis). [4] (e) Determine the gradient G of the graph. Show clearly on the graph how you obtained the necessary information. G =... [1] 0625/63/M/J/13 [Turn over

56 (f) 8 One of the students wishes to carry out the experiment again to obtain results which are more reliable. Describe one change she might make to the method to achieve this....[1] [Total: 10] 0625/63/M/J/13

57 9 3 Students in the IGCSE class are investigating the resistance of electric circuits with parallel branches. The apparatus has been set up as shown in Fig power supply circuit 1 A A B Fig. 3.1 The current in the circuit and the potential difference across the combination of lamps connected between A and B are to be measured. (a) On Fig. 3.1, draw the symbol for a voltmeter, connected to measure the potential difference V between A and B. [1] 0625/63/M/J/13 [Turn over

58 10 (b) The values of potential difference V across AB and current I for circuit 1 are recorded in Table 3.1. The lamps are then reconnected as shown in Fig. 3.2 and then Fig. 3.3 and the experiment is repeated. power supply circuit 2 A A B L power supply Fig. 3.2 circuit 3 A A B Fig. 3.3 (i) Calculate, and record in the table, the total resistance R of each combination of lamps, using the equation R = V I. [2] Complete the column headings in the table. [1] Table 3.1 circuit V / I / R / /63/M/J/13

59 11 (c) If each of the lamps had the same resistance, the total resistance of the lamps in circuit 3 would be twice the total resistance of the lamps in circuit 1. State whether the results in the table show this to be the case. Justify your answer by reference to the results. statement... justification... [2] (d) An IGCSE student wants to measure the potential difference across the lamp marked L in circuit 2. On the diagram for circuit 2, Fig. 3.2, show how a voltmeter should be connected to measure this potential difference. [1] [Total: 7] 0625/63/M/J/13 [Turn over

60 12 4 The IGCSE class has been asked to determine the density of an object. One student is finding the volume of the object using a measuring cylinder containing water in which the object is to be placed. The measuring cylinder containing only water is shown in Fig The measuring cylinder after the object has been placed in the water is shown in Fig cm measuring cylinder cm object Fig. 4.1 Fig. 4.2 (a) (i) Read and record the volume V 1 of the water in the measuring cylinder shown in Fig V 1 =... Read and record the volume V 2 of the water in the measuring cylinder shown in Fig V 2 =... [2] 0625/63/M/J/13

61 13 (b) The student then uses a balance to measure the mass m of the object, as shown in Fig g Fig. 4.3 Calculate the density of the object using the equation density = m (V 2 V 1 ). density =...[2] (c) Suggest a possible practical cause of inaccuracy in this method....[1] [Total: 5] 0625/63/M/J/13 [Turn over

62 14 5 IGCSE students are investigating the magnification produced by a converging lens. The apparatus is set up as shown below. d u illuminated triangle lens screen Fig. 5.1 The screen is moved until a sharp image of the object is seen on the screen. (a) (i) On Fig. 5.1, carefully measure u and record the value. u =... On Fig. 5.1, carefully measure d, the distance between the illuminated triangle and the screen when the image is sharp, and record the value. d =... (iii) Calculate a value m for the magnification, using your answers to (a)(i) and (a), and the equation m = d u u. m =... [2] (b) The illuminated triangle is shown in Fig The image of the triangle seen on the screen is shown in Fig illuminated triangle h o Fig /63/M/J/13

63 15 screen h i Fig. 5.3 (i) Measure h o, the height of the illuminated triangle, as shown in Fig. 5.2, and record the value. h o =... Measure h i, the height of the image on the screen, as shown in Fig. 5.3, and record the value. h i =... (iii) Calculate M, another value for the magnification, using your answers to (b)(i) and (b), and the equation M = h i. ho (c) A student says that the values of m and M should be the same. M =... [2] State whether your findings support this. Justify your answer by reference to your results for m and M. statement... justification... [2] 0625/63/M/J/13 [Turn over

64 (d) (i) 16 Describe one difficulty the students might have found when measuring the height of the image on the screen. Suggest a solution for the problem. difficulty solution [2] Suggest one further precaution which should be taken to make the experiment reliable [1] [Total: 9] 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. 0625/63/M/J/13

65 UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education * * PHYSICS 0625/63 Paper 6 Alternative to Practical October/November hour Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name on all the work you hand in. Write in dark blue or black pen. You may use a pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. Electronic calculators may be used. You may lose marks if you do not show your working or if you do not use appropriate units. 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 14 printed pages and 2 blank pages. DC (NF/SW) 65303/5 [Turn over

66 2 1 An IGCSE student is measuring the capacity of a drinks cup by three methods. The capacity of a cup is the maximum volume of liquid that it will hold in normal use. This maximum level is marked on the cup, as shown in Fig MAX g Fig. 1.1 Fig. 1.2 (a) Method 1 In Method 1, the capacity V 1 is determined from the mass of water in the cup. (i) The cup is filled to the marked level with water. It is then placed on the balance, as shown in Fig Read and record its mass m. m =... [1] Calculate a value for the capacity V 1, using your reading from (a)(i) and the equation V 1 = m ρ, where ρ = 1.00 g / cm3. V 1 =... [2] 0625/63/O/N/13

67 3 (b) Method 2 In Method 2, the capacity V 2 is measured directly from the volume of water in the cup. The cup is filled to the marked level and the water is tipped into a measuring cylinder, as shown in Fig cm measuring cylinder Fig. 1.3 Read and record the volume V 2 of water in the measuring cylinder. V 2 =... [1] 0625/63/O/N/13 [Turn over

68 4 (c) Method 3 In Method 3, the capacity V 3 is calculated by considering the cup as a cylinder, using the average diameter of the cup and an approximate equation. d 1 MAX h d 2 Fig. 1.4 (i) On Fig. 1.4, measure and record the diameter d 1 of the top of the cup. d 1 =... cm On Fig. 1.4, measure and record the diameter d 2 of the base of the cup. d 2 =... cm (iii) (iv) On Fig. 1.4, measure and record the height h from the base to the marked level MAX. h =... cm [1] Calculate the average diameter D using your readings from (c)(i) and (c), and the equation D = (d 1 + d 2 ). 2 D = /63/O/N/13

69 (v) 5 Calculate a value for the capacity V 3, using your results from (c)(iii) and (c)(iv) and the equation V 3 = πd2 h 4. V 3 =... [2] (d) State a possible practical source of inaccuracy in Method 2 and a possible practical source of inaccuracy in Method 3. Method 2... Method 3... [2] (e) State an additional measurement which could be taken to give a more accurate result in Method [1] [Total: 10] 0625/63/O/N/13 [Turn over

70 6 2 An IGCSE student is investigating methods of preventing loss of thermal energy. The student is using two beakers labelled A and B, as shown in Fig C thermometer insulation hot water thermometer C lid beaker A beaker B Fig. 2.1 Beaker A has a layer of insulation and beaker B has a lid but no insulation. The beakers contain hot water at the start of the experiment. The initial temperatures are as shown in Fig (a) Read, and record in the first row of Table 2.1, the temperatures of the water in beakers A and B at time t = 0. [1] (b) The temperatures of the hot water after 30 s, 60 s, 90 s, 120 s, 150 s and 180 s are shown in Table 2.1. Complete the column headings and enter the values of t in the table. [2] 0625/63/O/N/13

71 7 Table 2.1 beaker A beaker 8 t / θ / θ / (c) State from which beaker, if either, the rate of loss of thermal energy is the greater. Justify your answer by referring to the results. beaker... justification... [2] (d) State one condition that should be controlled to ensure that the comparison between beaker A and beaker B is a fair one.... [1] 0625/63/O/N/13 [Turn over

72 8 (e) A student points out that the experiment does not test the effectiveness of insulation in reducing thermal energy loss. Suggest a change to this experiment which could be made so that the effect of insulation could be investigated. Explain why this change would help. suggestion... explanation... [2] [Total: 8] 0625/63/O/N/13

73 9 BLANK PAGE 0625/63/O/N/13 [Turn over

74 10 3 IGCSE students are investigating the current and potential difference in an electrical circuit. The circuit is shown in Fig power supply X Y A F E D C B A resistance wire crocodile clip Fig. 3.1 (a) The potential difference across part of the resistance wire, and the current in the circuit are to be measured. On Fig. 3.1, use an appropriate circuit symbol to draw a voltmeter connected to measure the potential difference between X and Y. [1] (b) The crocodile clip is connected in turn to the resistance wire at points A, B, C, D, E and F. The potential difference V and current I are measured for each position and recorded in Table 3.1. Table 3.1 position V / V I / A A B C D E F /63/O/N/13

75 (i) 11 Plot a graph of V / V (y-axis) against I / A (x-axis). [4] Determine the gradient M of the graph. Show clearly on the graph how you obtained the necessary information. M =... [2] (iii) The gradient M is numerically equal to the resistance R of the power supply. Write down the resistance R to a number of significant figures suitable for this experiment. R =... [2] [Total: 9] 0625/63/O/N/13 [Turn over

76 12 4 An IGCSE class is investigating the reflection of light by a plane mirror. One student s ray-trace sheet is shown in Fig ray-trace sheet eye P 4 E P 6 C P 3 P 5 A N B D F Fig. 4.1 (a) In the first part of the experiment, a plane mirror is to be placed on line CD. (i) Draw a normal to AB at point N, towards the top of the page. Label the other end of this normal L. Two pins P 1 and P 2 are placed on line LN. Label suitable positions for P 1 and P 2. [1] 0625/63/O/N/13

77 13 (b) The mirror is placed on line CD and the images of P 1 and P 2 are viewed from the direction indicated by the eye in Fig Two pins P 3 and P 4 are placed so that the images of P 1 and P 2, and the pin P 3 all appear exactly in line with P 4. (i) Draw a line passing through P 3 and P 4 and reaching AB. Measure the angle θ between this line and the normal NL. Record this value in Table 4.1. [1] (c) The mirror is then moved to line EF and pins P 5 and P 6 are placed in line with the new images. Repeat steps (b)(i) and (b) using the new mirror line and pin positions. [1] Table 4.1 mirror on CD 20 mirror on EF 30 α / θ / (d) A student suggests that θ should always be equal to 2α. State whether the experimental results support this idea. Justify your answer with reference to the results. statement... justification... [2] (e) Suggest two precautions that could be taken to ensure accurate results from this experiment [2] [1] [Total: 8] 0625/63/O/N/13 [Turn over

78 14 5 Two IGCSE students are investigating the melting of ice cubes in water. They are dropping ice cubes into hot water at different temperatures and measuring the time taken for the cubes to melt. This is a page from one student s notebook. temperature 20 C time 216 seconds temperature 40 time 95 sec temperature 60 C time 72 seconds temperature 30 time 180 temperature 50 time 108 seconds (a) In the space below, draw a suitable table. Enter the readings in such a way that it is easier to see a pattern from them. [2] 0625/63/O/N/13

79 15 (b) It appears that one of the readings does not fit the general pattern. (i) At which temperature does this occur? temperature... [1] Suggest what the student might do next with the data to show more clearly that this reading does not fit the general pattern. Explain how this would help to make it more clear. suggestion explanation [2] [Total: 5] 0625/63/O/N/13

80 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. 0625/63/O/N/13

81 UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education * * PHYSICS 0625/33 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 pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. 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 12 printed pages. DC (NF/SW) 49538/4 UCLES 2012 [Turn over

82 2 1 A brick is dropped from the top of a very tall building as it is being constructed. Fig. 1.1 is the speed / time graph for the brick as it falls to the ground speed m / s time / s 16 Fig. 1.1 (a) State a time at which the acceleration of the brick is (i) zero, time =... [1] constant but not zero, time =... [1] (iii) not constant. UCLES /33/O/N/12 time =... [1] (b) Explain in terms of the forces acting on the brick why, between 0 and 14.0 s, its speed varies in the way shown by the graph.... [4] (c) State the direction of the resultant force acting on the brick at time 15.0 s.... [1] [Total: 8]

83 3 2 A bucket is full of oil. The total mass of the bucket of oil is 5.4 kg and the gravitational field strength is 10 N / kg. (a) Calculate the total weight of the bucket of oil. weight =... [1] (b) The bucket of oil is hung from a spring of unstretched length 20 cm. The limit of proportionality of the spring is not exceeded and its length increases to 35 cm. (i) State what is meant by the limit of proportionality [1] The oil is poured into a measuring tank. The empty bucket stretches the spring to a length of 25 cm. Calculate 1. the force that stretches the spring to a length of 25 cm, 2. the mass of the oil in the measuring tank. force =... [3] mass =... [2] (iii) The volume of the oil in the measuring tank is m 3. Calculate the density of the oil. density =... [2] (c) Explain, in terms of their molecules, why the density of the oil is greater than that of air.... [1] [Total: 10] UCLES /33/O/N/12 [Turn over