Cambridge IGCSE Physics 0625 — 2005 May/June Paper 6 · Variant 1

This document consists of 10 printed pages and 2 blank pages. SPA (MML 8431 5/04) S81555/2 © UCLES 2005 [Turn over UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education PHYSICS 0625/06 Paper 6 Alternative to Practical May/June 2005 1 hour Candidates answer on the Question Paper. No Additional Materials are required. Centre Number Candidate Number Name 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 1 2 3 4 5 Total www.XtremePapers.com

1 The IGCSE class is investigating the change in temperature of hot water as cold water is added to it. The students are provided with 100 cm3 of hot water and a supply of cold water at room temperature. (a) The thermometer in Fig. 1.1 shows the temperature of the cold water. Fig. 1.1 Record the temperature of the cold water, as shown in Fig. 1.1. … [1] (b) A student records the temperature of the hot water. He then pours 20 cm3 of the cold water into the beaker containing the hot water. He records the temperature
of the mixture of hot and cold water and the volume V of cold water added. He then repeats the process four times until he has added a total of 100 cm3 of cold water. The table shows the readings. (i) Complete the column headings in the table. [1] 0 10 –10 20 30 40 50 60 70 80 90 100 110 C 2 0625/06/M/J/05 For Examiner’s Use © UCLES 2005 V / 0 20 40 60 80 100
/ 80.0 58.0 48.0 40.5 34.0 29.0

(ii) Use the data in the table to plot a graph of temperature
(y-axis) against volume V (x-axis). [5] Question 1 continues on page 4 100 80 60 40 20 0 V / cm3 3 0625/06/M/J/05 [Turn over For Examiner’s Use © UCLES 2005

(c) A sketch graph of the readings taken by another student carrying out a similar experiment is shown in Fig. 1.2. The theoretical line shows the results expected by the student after calculating the values of
. The student assumed that all the heat lost by the hot water was gained by the cold water when the cold water was poured into the beaker. The other line shows the experimental results. Fig. 1.2 The student carried out the experiment with care. Suggest a practical reason why the experimental line differs from the theoretical line. … … [1] 100 80 60 40 20 0 30 40 50 60 70 80 V / cm3
/ C theoretical line experimental line 4 0625/06/M/J/05 For Examiner’s Use © UCLES 2005

5 0625/06/M/J/05 [Turn over For Examiner’s Use © UCLES 2005 2 (a) The table below shows some measurements taken by three IGCSE students. The second column shows the values recorded by the three students. For each quantity, underline the value most likely to be correct. The first one is done for you. [5] (b) A student is to find a value of the resistance of a wire by experiment. Potential difference V and current I can be recorded. The resistance is then calculated using the equation R = . State, with a reason, one example of good experimental practice that the student could use to obtain a reliable result. statement … reason … [2] V ––I quantity measured thickness of a metre rule volume of a test-tube current in a 12 V ray box lamp at less than normal brightness the surface area of the base of a 250 cm3 beaker the mass of a wooden metre rule the weight of an IGCSE student 0.25 mm 2.5 mm 25 mm 12 mm3 12 cm3 12 m3 0.5 A 5.0 A 50 A 0.3 cm2 3 cm2 30 cm2 0.112 kg 1.12 kg 11.2 kg 6 N 60 N 600 N recorded values

3 A student investigates the resistance of wire in different circuit arrangements. The circuit shown in Fig. 3.1 is used. Fig. 3.1 The student measures the current I in the wire. She then measures the p.d. V across AB, AC and AD. The student’s readings are shown in the table below. (a) Using Fig. 3.1, record in the table the length l of each section of wire. [1] A B C D power source metre rule crocodile clip A V 10 20 30 40 50 60 70 80 90 6 0625/06/M/J/05 For Examiner’s Use © UCLES 2005 © UCLES 2005 section of wire AB AC AD l / cm I / A 0.375 0.375 0.375 V / V 0.95 1.50 1.95 R /

(b) On Fig. 3.2, show the positions of the pointers of the ammeter reading 0.375 A, and the voltmeter reading 1.50 V. Fig. 3.2 [2] (c) Calculate the resistance R of the sections of wire AB, AC and AD using the equation R = . Record these values of R, to a suitable number of significant figures, in the table. [2] (d) Complete the column heading for the R column of the table. [1] (e) Use your results to predict the resistance of a 1.50 m length of the same wire. Show your working. resistance = … [2] V ––I 0 5 1 4 2 3 V 0 0.5 0.1 0.4 0.2 0.3 A 7 0625/06/M/J/05 [Turn over For Examiner’s Use © UCLES 2005 © UCLES 2005

4 A student investigates the period of oscillation of a mass attached between two springs. The apparatus used is shown in Fig. 4.1. Fig. 4.1 A 400 g mass m is attached between two springs, displaced a small distance downwards, and then released so that it oscillates. The time t taken for 10 complete oscillations of the mass is recorded. The experiment is repeated using values for m of 300 g and 200 g. The readings are shown in the table below. (a) Calculate the period T of the oscillations. T is the time for one complete oscillation. Enter the values in the table. [2] (b) Calculate and enter in the table the values of T . [2] — m clamp spring mass spring clamp 8 0625/06/M/J/05 For Examiner’s Use © UCLES 2005 © UCLES 2005 m / g 400 300 200 t / s T / s s –– g / T –– m 9.0 7.8 6.3

(c) The student suggests that T should be directly proportional to m. State with a reason whether the results in the table support this suggestion. statement … reason … … [2] (d) In this experiment, the mass oscillates rapidly so that it is difficult to take the times accurately. A technique has been included in this experiment to obtain an accurate value for the period T. State, briefly, what this technique is and any calculation involved to obtain the T value. … … … [2] (e) Another student carried out the same experiment using a wider range of masses. Suggest why, when the mass was 900 g, it could not oscillate freely. … [1] 9 0625/06/M/J/05 [Turn over For Examiner’s Use © UCLES 2005 © UCLES 2005

5 A student investigates the refraction of light through a transparent block. He places the transparent block on a sheet of plain paper, largest face down, and draws a line round the block. He draws a line to represent an incident ray and places two pins W and X in the line. Fig. 5.1 shows the outline of the block and the incident ray. Fig. 5.1 (a) On Fig. 5.1, draw a normal to line AB at the point where the incident ray meets the block. The incident ray is drawn on the diagram. The positions of the two pins W and X that mark the incident ray are shown. [1] (b) Measure the angle of incidence i. i = … [1] (c) Draw in the refracted ray with an angle of refraction of 20°. Continue this line until it meets the line CD. [2] (d) The ray emerges from the block in a direction that is parallel to the incident ray. Draw in this emergent ray. [2] (e) Two pins Y and Z are placed so that the pins W and X, viewed through the block, and the pins Y and Z all appear exactly in line with each other. Mark on the diagram, with the letters Y and Z, where you would place these two pins. [2] X W A D C B 10 0625/06/M/J/05 For Examiner’s Use © UCLES 2005 © UCLES 2005

BLANK PAGE 12 0625/06/M/J/05 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 University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.

UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education MARK SCHEME for the June 2005 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 June 2005 question papers for most IGCSE and GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses. www.XtremePapers.com

Grade thresholds for Syllabus 0625 (Physics) in the June 2005 examination. minimum mark required for grade: maximum mark available A C E F Component 6 40 33 25 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.

June 2005 GCSE MARK SCHEME MAXIMUM MARK: 40 SYLLABUS/COMPONENT: 0625/06 PHYSICS Alternative to Practical

Page 1 Mark Scheme Syllabus Paper IGCSE – June 2005 0625 6 © University of Cambridge International Examinations 2005 1 (a) 21oC (ignore unit) (20.9 acceptable) [1] (b) (i) t in oC and V in cm3 [1] (ii) θ axis labelled, with unit [1] scale 10oC to 1 cm or 0 - 100 in 25 sq steps or 20 - 80 in 10 sq steps [1] correct plots to ½ sq (-1 each error) [2] well judged best fit line [1] (c) heat lost to surroundings or by evaporation [1] [total: 8] 2 (a) 12 cm3 [1] 0.5 A [1] 30 cm2 [1] 0.112 kg [1] 600 N [1] (b) repeats [1] to spot anomalous results/to calculate average [1] or series of different V and I, plot graph or switch on/off, prevent temp rise or low current, minimise temp rise or avoidance of parallax, action and reason or clean wires, resistance caused by dirt or tap meter, prevent sticking or check zero error, accuracy (in each case the reason must support the statement to gain the second mark) [total: 7] 3 (a) l values 50, 75, 100 [1] (b) 1.50 V shown correctly [1] 0.375 A shown correctly [1] (c) 2.5(3); 4.0(0); 5.2(0) all correct [1] all to 2sf or all to 3sf [1] (d) Ω [1] (e) R = 7.50 - 8.00 [2] (or R = 6.60 - 7.49) [total: 8]

Page 2 Mark Scheme Syllabus Paper IGCSE – June 2005 0625 6 © University of Cambridge International Examinations 2005 4 (a) 0.90; 0.78; 0.63 (-1 each error, ignore sf) [2] (b) 0.00225; 0.00260; 0.00315 all correct (ecf) [1] all to 2sf or all to 3sf [1] (c) NO [1] T/m increases as m decreases (wtte) - if statement (no) correct [1] (d) time n oscillations [1] divide by n (n at least 3) [1] (e) lower spring fully compressed (wtte) [1] [total: 9] 5 (a) normal in correct position and at 90o (by eye) [1] (b) i = 29 - 31 [1] (c) refracted ray correct side of normal and at angle < i [1] r = 18 - 22 [1] (d) ray displaced and parallel to incident ray (by eye) [1] all correct lines drawn neatly, not too thick, and forming continuous path [1] (e) two pins on emerging ray, labelled Y and Z [1] pins at least 3 cm apart [1] [total: 8]