Cambridge IGCSE Physics 0625 — 2011 Oct/Nov Paper 5 · Variant 1

1 In this experiment, you will determine the weight of a metre rule. For Examiner’s Carry out the following instructions referring to Fig. 1.1. Use d x y 50.0 cm mark metre rule zero end X pivot Fig. 1.1 You are provided with a 1.0 N load, labelled X. (a) (i) Place the load X on the rule so that its centre is at d = 5.0 cm from the zero end of the rule as shown in Fig. 1.1. Record the value of d in Table 1.1. (ii) Adjust the position of the rule so that it is as near as possible to being balanced, with the 50.0 cm mark to the right of the pivot. (iii) Measure, and record in the table, the distance x from the centre of the load X to the pivot. (iv) Measure, and record in the table, the distance y from the pivot to the 50.0 cm mark on the rule. (v) Repeat the steps (i) – (iv) using d values of 10.0 cm, 15.0 cm, 20.0 cm and 25.0 cm. Table 1.1 d / cm x / cm y / cm [2] (b) Plot the graph of y / cm (y-axis) against x / cm (x-axis). You do not need to include the For origin (0,0) on your graph. Examiner’s Use [4] (c) Determine the gradient G of the graph. Show clearly on the graph how you obtained the necessary information. G = ..................................................[2] L (d) Calculate the weight W of the metre rule using the equation W = G, where L = 1.0 N. W = ..................................................[2] [Total: 10]

Mark scheme: 1 (a) & (b) correct d values 5, 10, 15, 20, 25 [1] x and y values present all less than 45 cm [1] (c) graph: axes labelled, y/cm and x/cm [1] scales suitable, using at least half of grid [1] all plots correct to nearest ½ small square [1] well-judged, continuous, thin best-fit line [1] (d) triangle method used and clearly shown, using at least half line [1] readings from graph correct to ½ small square [1] (e) W calculation correct with unit N and to 2 or 3 significant figures (ecf) [1] W value between 0.7 and 1.4 [1] [Total: 10]

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2 In this experiment, you will investigate temperature changes when hot water and cold water For are mixed. Examiner’s Use You are provided with a supply of hot water and a supply of cold (room temperature) water. (a) (i) Pour 100 cm3 of cold water into the beaker labelled A. Measure and record the temperature θc of the water in beaker A. θc = ...................................................... (ii) Measure and record the temperature θh of the hot water supplied. θh = ...................................................... (iii) Add 100 cm3 of the hot water to the water in beaker A. Measure and record the temperature θm of the mixture of hot and cold water. θm = ...................................................... (iv) State two precautions that you took to ensure the reliability of your value of the temperature θm. 1. ............................................................................................................................... .................................................................................................................................. 2. ............................................................................................................................... .................................................................................................................................. (v) Calculate θav, the average of θc and θh. average θav = ..................................................[4] (b) (i) Empty the water from beaker A. For Examiner’s (ii) Repeat the steps (a)(i), (ii), (iii) and (v) using 130 cm3 of cold water and 130 cm3 of Use hot water. θc = ...................................................... θh = ...................................................... θm = ...................................................... average θav = ..................................................[2] (c) A student suggests that the temperature of the mixture θm should be the average of θc and θh. State whether your experimental results support this suggestion and justify your statement by reference to your results. statement ......................................................................................................................... justification ....................................................................................................................... .......................................................................................................................................... .......................................................................................................................................... ......................................................................................................................................[2] (d) Suggest a practical reason in this experiment for the temperature of the mixture θm being different from the average value θav, even when the precautions you have stated in (a)(iv) have been taken. .......................................................................................................................................... ......................................................................................................................................[1] (e) Suggest a modification to the experiment which should reduce the difference between θm and θav. .......................................................................................................................................... ......................................................................................................................................[1] [Total: 10]

Mark scheme: 2 (a) θ c and θ h sensible values [1] θ m between θ c and θ h unit °C [1] Any two from: stirring waiting for temperature to stabilise view thermometer scale at right angles swift transfer [2] (b) θ c and θ h sensible values, θ m between θ c and θ h [1] correct average [1] (c) statement matches readings [1] justified by reference to readings, to include idea of within (or beyond) limits of experimental accuracy [1] (d) heat loss to surroundings o.w.t.t.e. [1] (e) any one from: lagging beakers swifter transfer of water lid on beaker [1] measure temperature in cylinder [Total: 10] IGCSE – October/November 2011 0625 51

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3 In this experiment, you will investigate the current in resistors in a circuit. For Examiner’s Carry out the following instructions referring to Fig. 3.1. The circuit is set up for you. Use power source A A D B C Fig. 3.1 (a) (i) Switch on. Record the current IA in the circuit. IA= ...................................................... Switch off. (ii) Change the position of the ammeter to the position marked B on Fig. 3.1. Switch on. Record the current IB in the circuit. IB= ...................................................... Switch off. (iii) Change the position of the ammeter to the position marked C on Fig. 3.1. Switch on. Record the current IC in the circuit. IC= ...................................................... Switch off. (iv) Change the position of the ammeter to the position marked D on Fig. 3.1. Switch on. Record the current ID in the circuit. ID= ..................................................[4] Switch off. (b) Theory suggests that IA= IB+ IC and ID= IB+ IC. For Examiner’s (i) Calculate IB+ IC. Use IB+ IC = ...................................................... (ii) State whether your experimental results support the theory and justify your statement by reference to your results. statement ................................................................................................................. justification ............................................................................................................... .................................................................................................................................. ..............................................................................................................................[3] (c) (i) Connect the voltmeter so that it measures the potential difference V across the combination of the three resistors. Record the potential difference V. V = ...................................................... (ii) Calculate the resistance R of the combination of the three resistors using the V equation R = . I R = ..................................................[2] (d) On Fig. 3.1, draw in the voltmeter connected as described in (c)(i) using the standard symbol for a voltmeter. [1] [Total: 10]

Mark scheme: 3 (a) all I values to 2 decimal places [1] unit A at least once (and not contradicted) [1] IA and ID both greater than IB and IC [1] IA = (IB + IC) to 1 decimal place [1] (b) (IB + IC) correct [1] statement matches readings [1] justified by reference to readings [1] (c) V to at least 1 decimal place and < 2.5(V) [1] R correct, 2 or 3 significant figures and unit [1] (d) voltmeter symbol correct and correctly connected [1] [Total: 10]

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4 In this experiment, you will investigate the reflection of light by a plane mirror. For Examiner’s Carry out the following instructions referring to Fig. 4.1. Use O ray trace N sheet C M1 R1 2 cm B M R A L eye Fig. 4.1 (a) Draw a line 10 cm long near the middle of the ray trace sheet. Label the line MR. Draw a normal to this line that passes through its centre. Label the normal NL. Label the point at which NL crosses MR with the letter B. (b) Draw a line 8 cm long from B at an angle of incidence i = 40° to the normal below MR and to the left of the normal. Label the end of this line A. Record the angle of incidence i in Table 4.1. (c) Place the mirror, with its reflecting face vertical, on the line MR. The mirror has a line drawn on it. One end of this line must be at point B. (d) Place a pin P1 at A. (e) View the line on the mirror and the image of pin P1 from the direction indicated by the For Examiner’s eye in Fig. 4.1. Place two pins P2 and P3 some distance apart so that pins P3, P2, the image of P1, and the line on the mirror all appear exactly one behind the other. Label the Use positions of P2 and P3. (f) Remove the pins and the mirror and draw in the line joining the positions of P2 and P3. Continue the line until it meets the normal. (g) Measure, and record in the table, the angle of reflection r between the normal and the line passing through P2 and P3. Table 4.1 i / ° r / ° [3] (h) Draw a line parallel to MR and 2 cm above it. Label the line M1R1. Label the point at which NL crosses the line with the letter C. (i) Draw a line from A to C. Measure, and record in the table, the angle of incidence i between line AC and the normal. (j) Place the mirror, with its reflecting face vertical, on the line M1R1. One end of the line on the mirror must be at point C. (k) Repeat the steps (d) – (g). (l) In spite of carrying out this experiment with reasonable care, it is possible that the values of the angle of reflection r will not be exactly the same as the values obtained from theory. Suggest two possible causes of this inaccuracy. 1. ...................................................................................................................................... .......................................................................................................................................... 2. ...................................................................................................................................... ......................................................................................................................................[2] Tie in your ray trace sheet between pages 10 and 11. [5] [Total: 10]

Mark scheme: 4 (a)–(f) trace: normal at 90° in correct position [1] all lines present and neat [1] AB correct position [1] first P2P3 distance [ 5.0cm [1] (h)–(j) trace: M1R1 and AC correct [1] table: i values correct to 2° [1] r values correct to 2° [1] both i = r to 4° [1] (l) any two from: thickness of lines thickness of mirror thickness of protractor o.w.t.t.e. thickness of pins/holes [2] [Total: 10]

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