Cambridge IGCSE Physics 0625 — 2005 Oct/Nov Paper 6 · Variant 1

This document consists of 10 printed pages and 2 blank pages. (SP) MML 8431 5/04 S82205/3 © UCLES 2005 [Turn over UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education PHYSICS 0625/06 Paper 6 Alternative to Practical October/November 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 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 effect of a load on a rule attached to a spring. The apparatus used is shown in Fig. 1.1. Fig. 1.1 The rule has the zero end taped to the bench so that it does not slip. The rule is attached to a spring at the 40.0 cm mark. The students hang masses, starting with a 10 g mass, on the rule at the 90.0 cm mark. For each mass, they measure the angle
between the rule and the bench. One student’s readings are shown in the table. (a) Complete the column headings in the table. [1] (b) A student suggests that
should be directly proportional to m. State, with a reason, whether the readings in the table support this suggestion. statement … reason … … [2] zero end of rule taped to bench metre rule mass bench spring clamp
2 0625/06/O/N/05 For Examiner’s Use © UCLES 2005 m / 0 10 20 30 40 50
/ 29 28 26 25 22 19

(c) A student carries out this experiment using the 360 ° protractor shown in Fig. 1.2. Fig. 1.2 Explain how the student could use this protractor to measure the angle
between the metre rule and the bench. You may draw a diagram if you wish. … … [2] (d) The range of angles measured in this experiment may be quite small. Using the same apparatus and with the masses and spring in the same positions, suggest another method of investigating as reliably as possible the extent by which the rule is pulled down by the masses. This method must not use a protractor but an additional rule may be used. You may draw a diagram if you wish. … … [2] 0 1 0 2 0 3 0 40 5 0 6 0 70 8 0 9 0 1 0 0 1 1 0 12 0 1 30 1 4 0 1 50 16 0 17 0 1 80 1 90 2 0 0 2 1 0 22 0 2 30 2 40 2 5 0 2 6 0 2 7 0 2 80 2 90 3 0 0 3 10 3 2 0 3 30 3 40 350 3 0625/06/O/N/05 [Turn over For Examiner’s Use © UCLES 2005

2 An IGCSE student investigates the resistance of resistance wire ABCD in three different circuit arrangements. The circuits are shown in Fig. 2.1. Fig. 2.1 4 0625/06/O/N/05 For Examiner’s Use © UCLES 2005 A C D B power source A V circuit (i) circuit (ii) circuit (iii) A C D B power source A V power source

(a) Circuit (iii) is the same as circuit (ii) but with an additional connecting lead between A and D. On Fig. 2.1, complete the circuit diagram for circuit (iii) using the standard symbol for a resistor to represent each section AB, BC and CD of the resistance wire. [3] (b) The student measures and records the current I and the p.d. V in each circuit. The student’s readings are shown in the table. (i) Complete the column headings for each of the I, V and R columns of the table. [1] (ii) Calculate the resistance R for each circuit using the equation R = . Record in the table the values of R to an appropriate number of significant figures. [2] (c) Look at the resistance values for circuits (i) and (ii). The sections of resistance wire AB, BC and CD are all of the same length. Suggest a value for the resistance of the whole wire ABCD. Explain briefly how you obtained your value. value … explanation … … [2] V ––I 5 0625/06/O/N/05 [Turn over For Examiner’s Use © UCLES 2005 I / 0.91 0.45 1.37 circuit (i) (ii) (iii) V / 1.80 1.80 1.85 R /

3 The IGCSE class carries out an experiment to investigate the effect of insulation on the rate of cooling of hot water. The apparatus is shown in Fig. 3.1. Fig. 3.1 The students each have two glass beakers A and B. Beaker B is insulated. They also have a supply of hot water. A student pours hot water into beaker A until it is approximately two thirds full and then measures the temperature
of the hot water. He records this temperature in the table at time t = 0 s. He then starts a stopwatch and records the temperature of the water at 30 s intervals for a total of four minutes. He repeats the experiment using beaker B. All the readings are shown in the tables below. thermometer water thermometer water beaker A beaker B bench insulation 6 0625/06/O/N/05 For Examiner’s Use © UCLES 2005 t / beaker A beaker B 0 30 60 90 120 150 180 210 240
/ 80 67 59 54 51 48 47 46 45 t / 0 30 60 90 120 150 180 210 240
/ 80 69 62 57 53 50 48 47 46

(a) Complete the column headings in the tables. [1] (b) Use the readings for beaker A to plot a graph of temperature
(y-axis) against time t (x-axis). Start the temperature scale at 40 °C. Draw the best-fit curve. [4] (c) Use the readings for beaker B to plot another curve on the same graph axes that you used in part (b). [2] (d) The experiment you have just done was designed to investigate the effect of insulation on the rate of cooling. Suggest two improvements that could be made to the design of the experiment. 1. … … 2. … … [2] 160 180 200 220 240 260 280 140 120 100 80 60 40 20 0 t / s 7 0625/06/O/N/05 [Turn over For Examiner’s Use © UCLES 2005

4 An IGCSE student is investigating the reflection of light by a plane mirror. Fig. 4.1 On Fig. 4.1, the line MM' shows the position of the mirror that is standing on a sheet of paper. The reflecting surface of the mirror is vertical. AB is a card that is standing vertically and is parallel to the reflecting surface of the mirror. (a) Draw a normal to the mirror such that the edge B of the card lies on the normal. [1] (b) Measure the distance x along the normal between the line MM' and the edge B of the card. x = … [1] (c) Draw a line from the edge A of the card to the point where the normal meets the line MM'. This represents an incident ray from the edge of the card. [1] (d) Measure the angle i between the incident ray and the normal. i = … [1] M A B M' card 8 0625/06/O/N/05 For Examiner’s Use © UCLES 2005

(e) Calculate the ratio where y = 5.0 cm, the length of the card. = … [2] (f) The angle of reflection is to be determined as accurately as possible. On Fig. 4.1, mark with the letters X, Y and Z the points where the student would place three pins in order to plot the reflected ray. [4] x –– y x –– y 9 0625/06/O/N/05 [Turn over For Examiner’s Use © UCLES 2005 © UCLES 2005 © UCLES 2005

5 (a) The IGCSE class carries out an experiment to investigate the rate of cooling from 100 °C of a range of hot liquids. Underline any of the following variables that are likely to have a significant effect on the temperature readings. (You may underline one, two or all three of the suggested variables.) type and size of container volume of liquid temperature of the surroundings [2] (b) In an experiment to find the resistance of a wire, the students record the current in the wire and the potential difference across it. They then calculate the resistance. Underline any of the following variables that are likely to have a significant effect on the current and/or potential difference readings. (You may underline one, two or all three of the suggested variables.) atmospheric pressure temperature of the wire length of wire [2] (c) In an experiment, a short pendulum oscillates rapidly. A student is asked to find the period of oscillation T of the pendulum using a stopwatch. The student sets the pendulum swinging and records the time for one oscillation. A technique for improving the accuracy of the value obtained for the period T should be used in this experiment. State, briefly, what this technique is and any calculation involved to obtain the value of T. … … … [2] 10 0625/06/O/N/05 For Examiner’s Use © UCLES 2005

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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education MARK SCHEME for the November 2005 question paper 0625 Physics 0625/06 Paper 6 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. The minimum marks in these components needed for various grades were previously published with these mark schemes, but are now instead included in the Report on the Examination for this session. • CIE will not enter into discussion or correspondence in connection with these mark schemes. CIE is publishing the mark schemes for the November 2005 question papers for most IGCSE and GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses. www.XtremePapers.com

Page 1 Mark Scheme Syllabus Paper IGCSE – NOVEMBER 2005 0625 6 © University of Cambridge International Examinations 2005 1 (a) m in g and θ in degrees 1 (b) θ not directly proportional to m 1 as m increases θ decreases 1 (c) clear in words or diagram that 'centre point' of protractor is at point where bottom edge of rule meets protractor and 0 – 180 line is horizontal 1 similarly clear how 'dead space' is dealt with, e.g. protractor stuck to edge of bench with 0 – 180 line at top of bench level OR rule placed on block that is same height as 'dead space' 1 (d) words or diagram to show rule at end of metre rule to measure height above bench level 1 clear that rule is vertical (e.g. use set square) OR clamped at constant angle 1 TOTAL 7 2 (a) correct symbols for resistor, voltmeter and ammeter 1 correct connections between resistors AB and BC in series with CD in parallel with both 1 voltmeter and ammeter correctly positioned 1 (b) I in A, V in V, R in Ω 1 1.98 or 2.0; 4.00 or 4.0; 1.06 or 1.1 1 all to 2 sf or 3 sf 1 (c) 5.9Ω – 6.1Ω 1 resistance proportional to length/ doubling length, doubled resistance/ 3 x length will have 3 x resistance/ wtte 1 TOTAL 8 3 (a) θ in oC, t in s 1 (b) & (c) θ axis labelled 1 scale starts at 40 oC and 2 cm to 10 oC 1 plots correct to ½ sq (–1 each error) 2 well judged best fit curves 1 lines not too thick 1 (d) Two from: e.g. use a lid insulate the bottom of the beaker use a container that is a good conductor (metal) 2 TOTAL 9 4 (a) normal in correct position and at 90o (by eye) 1 (b) 9.9 – 10.2 cm 1

Page 2 Mark Scheme Syllabus Paper IGCSE – NOVEMBER 2005 0625 6 © University of Cambridge International Examinations 2005 (c) incident ray drawn in correctly 1 (d) 27o (± 2o) 1 (e) 2.0 (or correct from candidates x value) 1 2 or 3 sf and no unit 1 (f) X on incident ray close to mirror 1 Y and Z on reflected ray 1 Y – Z distance at least 5 cm 1 i = r (by eye) 1 TOTAL 10 5 (a) 1, 2 and 3 (–1 each error or omission) 2 (b) 2 and 3 (–1 each error or omission) 2 (c) time a number (n) oscillations 1 divide time by n 1 TOTAL 6