Cambridge IGCSE Physics 0625 — 2004 Oct/Nov Paper 6 · Variant 1

This document consists of 12 printed pages. MML 5677 5/03 S67109/2 © UCLES 2004 [Turn over UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education PHYSICS 0625/06 Paper 6 Alternative to Practical October/November 2004 1 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 in the spaces provided on the Question Paper. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. Answer all questions. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. If you have been given a label, look at the details. If any details are incorrect or missing, please fill in your correct details in the space given at the top of this page. Stick your personal label here, if provided. For Examiner’s Use 4 3 2 1 5 Total Centre Number Candidate Number Name www.XtremePapers.com

1 The IGCSE class is investigating the rate of cooling of water in a beaker. Some of the apparatus used is shown in Fig. 1.1. Fig. 1.1 During the experiment, a student measures the temperature of the water, its volume, the length of string wrapped round a beaker and the depth of water in the beaker. (a) Write down the readings shown in Figs. 1.2 and 1.3. Include appropriate units. Fig. 1.2 temperature = … Fig. 1.3 volume of water in the measuring cylinder = … [3] 80 100 cm3 20 40 60 0 –10 10 20 30 40 50 60 70 80 90 100 110 °C beaker hot water string thermometer 2 0625/06/O/N/04 For Examiner’s Use © UCLES 2004

(b) The string is wrapped 5 times round the beaker and marked as shown in Fig. 1.4. Fig. 1.4 The string is held against a metre rule as shown in Fig. 1.5. Fig. 1.5 (i) Write down the length of the string between the marks. length = … cm (ii) Calculate the circumference c of the beaker. c = … cm (iii) Suggest one source of error in this method of determining the circumference. … … (iv) Suggest one improvement to this method. … … [4] cm 10 20 30 40 50 60 70 80 90 string metre rule mark mark beaker string 3 0625/06/O/N/04 [Turn over For Examiner’s Use © UCLES 2004

(c) A rule is placed beside the beaker, as shown in Fig. 1.6. Fig. 1.6 (i) Write down the depth d of the water in the beaker. d = … cm (ii) Calculate the surface area A of the curved surface of the beaker up to the water level using the equation A = dc. A = … [2] (d) State the other measurements that need to be taken to determine the rate of cooling of the water. … … [2] cm 1 2 3 4 5 water beaker 4 0625/06/O/N/04 For Examiner’s Use © UCLES 2004

2 A student carries out an experiment to determine the density of plasticine. She records the mass m and the volume V of a range of differently-sized samples. These readings are plotted on a graph as shown in Fig. 2.1. Fig. 2.1 (a) (i) Determine the gradient G of the line. Show clearly how you obtain the necessary information. G = … (ii) Determine the density  of the plasticine using the equation  = 1— G .  = … [5] (b) The student could calculate the density from one set of readings. Suggest why she takes more than one set of readings and plots a graph. … … [1] 40 30 20 10 0 0 20 40 60 80 100 V / cm3 m / g 5 0625/06/O/N/04 [Turn over For Examiner’s Use © UCLES 2004

3 A student carries out an experiment using a simple pendulum. Fig. 3.1 shows the apparatus. Fig. 3.1 The student records the time t taken for 20 complete oscillations for a range of different lengths x of the string. The readings are shown in the table. The length l of the pendulum is given by the equation l = x + r, where r is the radius of the pendulum bob. Fig. 3.2 shows the pendulum bob drawn actual size. Fig. 3.2 string pendulum bob bench x string clamp pendulum bob 6 0625/06/O/N/04 For Examiner’s Use © UCLES 2004 x / cm l / cm t / s T / s 90.0 38.5 80.0 36.0 70.0 33.4 60.0 31.4 50.0 28.2 40.0 25.5

(a) (i) Use your rule to measure the diameter d of the pendulum bob. d = … (ii) Calculate the radius r of the pendulum bob. r = … [2] (b) (i) Complete the column for the length l / cm in the table using the equation l = x + r. (ii) The period T is the time taken for one complete oscillation. Complete the column for the period T / s in the table. [3] (c) Plot the graph of T / s (y-axis) against l / cm (x-axis). Start the T / s axis at T = 1.0 s. [5] (d) Using the graph, find the length la of the pendulum that would have a period of 1.50 s. la = … cm [1] 7 0625/06/O/N/04 [Turn over For Examiner’s Use © UCLES 2004

4 A student is investigating the passage of light through a transparent block, as shown in Fig. 4.1. Fig. 4.1 A B incident ray emergent ray transparent block eye 8 0625/06/O/N/04 For Examiner’s Use © UCLES 2004

The student looks through the block. He places pins so that two pins marking the incident ray and two pins marking the emergent ray all appear to be exactly one behind the other. (a) On Fig. 4.1, mark suitable positions for the four pins, two on the incident ray and two on the emergent ray. [1] (b) (i) On Fig. 4.1, draw the normal at point A. (ii) On Fig. 4.1, draw in the line AB. Measure and record the angle of refraction r between the line AB and the normal. r = … (iii) Measure and record the angle of incidence i between the incident ray and the normal. i = … [4] 9 0625/06/O/N/04 [Turn over For Examiner’s Use © UCLES 2004

5 The IGCSE class is carrying out investigations of the resistance of bare resistance wires. Fig. 5.1 shows the circuit used. Fig. 5.1 The students record the current I in the circuit and then record the p.d. V across different lengths l of the bare resistance wire. The length of wire from A to B is 100.0 cm. The readings obtained by one student are shown in the table. I = 0.84 A (a) (i) Calculate the resistance of each length l of wire using the equation R = V—I . Write the resistance values in the table. (ii) Complete the column headings in the table. [3] V A A B l power source bare resistance wire 10 0625/06/O/N/04 For Examiner’s Use © UCLES 2004 V / l / R / 0.39 20.0 0.82 40.0 1.22 60.0 1.58 80.0 1.89 100.0

(b) In a second experiment, the students use wires of the same material but with different diameters d. The p.d. is measured across the same length of wire each time. Fig. 5.2 shows the circuit used. Fig. 5.2 These are the readings correctly obtained by one student. Wire 1 I = 0.1 A Wire 2 I = 0.4 A V = 1.8 V V = 1.8 V d = 0.24 mm d = 0.48 mm (i) Calculate the resistance R of each wire, using the equation R = V—I . wire 1, R = … wire 2, R = … [1] (ii) Based on the results for the two wires, which of the following statements is a correct conclusion? Tick one box. A wire with half the diameter has half the resistance. A wire with half the diameter has twice the resistance. A wire with half the diameter has one quarter the resistance. A wire with half the diameter has four times the resistance. [1] A V A B power source bare resistance wire 11 0625/06/O/N/04 [Turn over For Examiner’s Use © UCLES 2004

(iii) Using your answers to (i) and (ii), calculate the expected resistance of a wire AB of the same material if it has a diameter of 0.12 mm. expected resistance = … [1] (c) What instrument would you use to measure the diameter of the wires as accurately as possible? … [1] Copyright Acknowledgements Every reasonable effort has been made to trace all copyright holders where the publishers (i.e. UCLES) are aware that third-party material has been reproduced. The publishers would be pleased to hear from anyone whose rights we have unwittingly infringed. University of Cambridge International Examinations is part of the University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge. 12 0625/06/O/N/04 For Examiner’s Use © UCLES 2004

UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education MARK SCHEME for the November 2004 question paper 0625 PHYSICS 0625/06 Paper 6 (Alternative to Practical), maximum mark 40 This mark scheme is published as an aid to teachers and students, to indicate the requirements of the examination. It shows the basis on which Examiners were initially instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began. Any substantial changes to the mark scheme that arose from these discussions will be recorded in the published Report on the Examination. All Examiners are instructed that alternative correct answers and unexpected approaches in candidates’ scripts must be given marks that fairly reflect the relevant knowledge and skills demonstrated. Mark schemes must be read in conjunction with the question papers and the Report on the Examination. • CIE will not enter into discussion or correspondence in connection with these mark schemes. CIE is publishing the mark schemes for the November 2004 question papers for most IGCSE and GCE Advanced Level syllabuses. www.XtremePapers.com

Grade thresholds taken for Syllabus 0625 (Physics) in the November 2004 examination. minimum mark required for grade: maximum mark available A C E F Component 6 40 34 26 20 15 The threshold (minimum mark) for B is set halfway between those for Grades A and C. The threshold (minimum mark) for D is set halfway between those for Grades C and E. The threshold (minimum mark) for G is set as many marks below the F threshold as the E threshold is above it. Grade A* does not exist at the level of an individual component.

November 2004 INTERNATIONAL GCSE MARK SCHEME MAXIMUM MARK: 40 SYLLABUS/COMPONENT: 0625/06 PHYSICS Alternative to Practical

Page 1 Mark Scheme Syllabus Paper IGCSE – November 2004 0625 6 © University of Cambridge International Examinations 2005 1 (a) (i) 84 1 (ii) 50 1 both units correct oC and cm3 (or ml) 1 (b) (i) 75 1 (ii) 15 (ecf) 1 (iii) source of error e.g. thickness of string/extension of string/diagonal windings/identified parallax 1 (iv) improvement e.g. thinner string/inextensible string/parallel windings/ no gaps between windings/repeats and averages 1 (c) (i) 2.1 (cm) 1 (ii) 31.5 or 32 cm 2 (2/3 sf and unit required) 1 (d) time 1 another temperature 1 TOTAL 11 2 (a) (i) triangle seen 1 large triangle (> ½ line) 1 correct readings to ½ sq 1 G = 0.37 – 0.39 1 (ii) ρ = 2.63 (ecf) 1 2/3 sf and g/cm3 1 (b) increased accuracy 1 TOTAL 6 3 (a) (i) 2.15 – 2.25 1 (ii) 1.1 (+ both with correct unit, cm/mm) ecf 1 (b) (i) all correct 1 values, 91.1, 81.1, 71.1, etc 1 (ii) all correct T values, 1.93, 1.80, 1.67, 1.57, 1.41, 1.28 1 3/4sf for T 1

Page 2 Mark Scheme Syllabus Paper IGCSE – November 2004 0625 6 © University of Cambridge International Examinations 2005 (c) Graph: scales suitable T start at 1.0s, T: 10sq : 0.2s 1: 10sq : 20cm; both labelled and correct way round 1 plots correct to ½ sq (-1 each error) 2 line judgement 1 line thickness 1 (d) 58 cm 1 TOTAL 11 4 (a) 4 pins at least one separation, separation > 5 cm 1 normal at 90o (by eye) 1 r = 19 – 21 1 i = 31 – 33 1 unit given for both 1 TOTAL 5 5 (a) (i) all R correct, 0.464, 0.976, 1.45, 1.88, 2.25 1 2/3 sf for R 1 (ii) V, cm, Ω 1 (b) (i) 18, 4.5 (ignore unit) 1 (ii) answer 4 1 (iii) 72 1 (c) micrometer 1 TOTAL 7