Cambridge IGCSE Physics 0625 — 2019 Oct/Nov Paper 5 · Variant 1

1 In this experiment, you will determine the weight of a metre rule using a balancing method. Carry out the following instructions, referring to Fig. 1.1. 50.0 cm mark a b 90.0 cm mark P 0 cm mark metre rule pivot bench Fig. 1.1 (a) • Place the metre rule on the pivot. Place the load P, labelled 1.5 N, on the metre rule at the 90.0 cm mark. Keep P at the 90.0 cm mark and adjust the position of the metre rule on the pivot so that the metre rule is as near as possible to being balanced. • In Table 1.1, record the distance a from the 50.0 cm mark to the pivot. • In Table 1.1, record the distance b from the 90.0 cm mark to the pivot. a • Calculate b. Record its value in Table 1.1. • Repeat the procedure using the loads labelled 1.2 N, 1.0 N, 0.8 N and 0.5 N. Table 1.1 Weight of a a / cm b / cm load P / N b 1.5 1.2 1.0 0.8 0.5 [3] a(b) Plot a graph of Weight of Load P / N (y-axis) against (x-axis). You do not need to begin your b axes at the origin, (0,0). [4] (c) Determine the gradient G of the graph. Show clearly on the graph how you obtained the necessary information. G = ........................................................ [2] (d) The gradient G is numerically equal to the weight W of the metre rule. Write down the value of W to an appropriate number of significant figures for this experiment. Include the unit. W = ........................................................ [2] [Total: 11]

Mark scheme: 1(a) a values all < 30 cm 1 b values (40 – a) 1 a / b values correct 1 1(b) Graph: Axes correctly labelled and right way round 1 Suitable scales 1 All plots correct to ½ small square 1 Good line judgement, thin, continuous line 1 1(c) triangle method indicated on graph 1 triangle at least half of candidate’s distance between extreme plots 1 1(d) W = G value in (c) to 2 or 3 significant figures 1 Unit N 1

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2 In this experiment, you will investigate the resistance of lamps. The circuit shown in Fig. 2.1 has been set up for you. power supply A L1 V Fig. 2.1 (a) (i) Close the switch. Measure and record the potential difference (p.d.) V1 across the lamp L1 and the current I1 in the circuit. Open the switch. V1 = .............................................................. I1 = .............................................................. [2] V1 (ii) Calculate the resistance R1 of the lamp L1 using the equation R1 = . I1 R1 = ........................................................ [1] (b) Disconnect the voltmeter. Connect the lamp L2 in series with the lamp L1. Connect the voltmeter across the two lamps L1 and L2. Close the switch. • Measure and record the p.d. V2 across lamps L1 and L2 and the current I2 in the circuit. Open the switch. V2 = .............................................................. I2 = .............................................................. • Calculate the combined resistance R2 of lamps L1 and L2 connected in series, using the V2 equation R2 = . I2 R2 = .............................................................. [1] (c) Disconnect the voltmeter. Connect the lamp L3 in series with lamps L1 and L2. Connect the voltmeter across all three lamps. Close the switch. • Measure and record the potential difference V3 across the three lamps and the current I3 in the circuit. Open the switch. V3 = .............................................................. I3 = .............................................................. • Calculate the combined resistance R3 of lamps L1, L2 and L3 connected in series, using V3 the equation R3 = . I3 R3 = .............................................................. [2] (d) A student suggests that the resistance R3 of the three lamps connected in series should be given by the equation R3 = 3 × R1. State whether your results agree with this suggestion. Justify your answer by reference to your results. statement .................................................................................................................................. justification ................................................................................................................................. ................................................................................................................................................... ................................................................................................................................................... [2] (e) Complete the circuit diagram in Fig. 2.2 to show: • three lamps connected in parallel • a voltmeter connected to measure the potential difference across the lamps • a variable resistor connected to control the current in all three lamps. power supply A Fig. 2.2 [3] [Total: 11]

Mark scheme: 2(a)(i) V to at least 1 decimal place and < 3 V 1 I to at least 2 decimal places and < 1 A 1 2(a)(ii) R1 correct 1 2(b) V2, I2 and R2 present and I2 < I1 1 2(c) V3 and I3 present correct units V, A and Ω seen and not contradicted 1 R3 < 3R1 1 2(d) Statement matches results (Expect NO) 1 Justification matches statement 1 2(e) Lamps in parallel and correct symbol for lamp 1 One voltmeter, with correct symbol, in parallel with lamps 1 Variable resistor in correct position, with correct symbol 1

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3 In this experiment, you will investigate the cooling of water. (a) Use the thermometer to measure room temperature θR. θR = ........................................................ [1] (b) • Pour 200 cm3 of hot water into the beaker. Place the thermometer in the beaker. • Measure the temperature θ of the hot water in the beaker and immediately start the stopclock. • Record this temperature in Table 3.1 at time t = 0. • Continue recording the temperature θ of the water every 60 s until you have a total of six sets of readings of time and temperature in Table 3.1. • Complete the column headings in Table 3.1. Table 3.1 t / θ/ 0 [2] (c) • Calculate the decrease in temperature Δθ1 during the first 120 s. Δθ1 = .............................................................. • Calculate the decrease in temperature Δθ2 during the last 120 s. Δθ2 = .............................................................. [1] (d) (i) Tick the box to show your conclusion from the results in (c). The average rate of cooling is greater in the first 120 s than the average rate of cooling in the last 120 s. The average rate of cooling is less in the first 120 s than the average rate of cooling in the last 120 s. The average rate of cooling is the same in the first 120 s as in the last 120 s. [1] (ii) Justify your conclusion in (d)(i) by reference to the results. ........................................................................................................................................... ........................................................................................................................................... ..................................................................................................................................... [2] (e) Suggest two ways in which you could reduce the rate of loss of thermal energy from the beaker in this type of experiment. 1 ............................................................................................................................................... ................................................................................................................................................... 2 ............................................................................................................................................... ................................................................................................................................................... [2] (f) Draw a diagram of a measuring cylinder being used to determine the volume of water poured into the measuring cylinder. Show clearly the water level and draw a straight line showing the line of sight required to obtain an accurate reading of the volume of water. [2]

Mark scheme: 3(a) Sensible value for room temperature 1 3(b) Units s and °C; times 60, 120, 180, 240, 300 1 Temperatures decreasing, consistent whole numbers or consistent 1dp for temperatures 1 3(c) Correct calculations 1 3(d)(i) Correct box ticked to match readings 1 3(d)(ii) Justification to match (i), quoting figures 1 Reference to same time 1 3(e) Two from: Insulate Lid Lower starting temperature Higher room temperatura Smaller volume of water Smaller surface area 1 3(f) Clearly shown perpendicular line of sight 1 Clearly shown bottom of meniscus 1

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4 A student investigates the time taken for metal balls to stop moving after being released on a curved track. Fig. 4.1 shows the shape of the track. The track is flexible, so the shape of the curve can be changed. metal ball Fig. 4.1 The following apparatus is available: a selection of metal balls of different masses the flexible track clamps to hold the track a stopwatch a tape measure a metre rule The student can also use other apparatus and materials that are usually available in a school laboratory. Plan an experiment to investigate a factor that affects the time taken for metal balls to stop moving after being released on a curved track. You are not required to carry out this investigation. In your plan, you should: • describe how you would expect the balls to move • explain how you would carry out the investigation • state which variables you would keep constant and which variable you would change • draw a table, or tables, with column headings, to show how you would display your readings (you are not required to enter any readings in the table) • explain how you would use your readings to reach a conclusion. You may add to the diagram in Fig. 4.1 if it helps your explanation. .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... .......................................................................................................................................................... [7] [Total: 7]

Mark scheme: 4 MP1 How the ball will move: Back and forth / like a pendulum 1 MP2 Release from a determined position, time until stops 1 MP3 Repeat with at least two more values of independent variable 1 MP4 Statement of variable to be changed 1 MP5 Statement of a variable to keep constant 1 MP6 Table with columns for chosen variable that is changed and time with correct units, s for time. 1 MP7 Compare chosen variable with time. Or plot graph of chosen variable against time. 1

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