Cambridge IGCSE Physics 0625 — 2005 Oct/Nov Paper 5 · Variant 1

This document consists of 7 printed pages, 1 blank page and an inserted Answer Booklet. MML 8430 4/04 S81907/3 © UCLES 2005 [Turn over UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education PHYSICS 0625/05 Paper 5 Practical Test October/November 2005 1 hour 15 minutes Additional Materials: As specified in the Confidential Instructions READ THESE INSTRUCTIONS FIRST Follow the instructions on the front cover of the Answer Booklet. Write your answers in the spaces provided in the Answer Booklet. Answer all questions. You are expected to record all your observations as soon as they are made. An account of the method of carrying out the experiments is not required. At the end of the examination, hand in only the Answer Booklet. www.XtremePapers.com

1 In this experiment you are to investigate the effect of a load on a rule attached to a spring. Record all your observations on pages 2 and 3 of your Answer Booklet. Carry out the following instructions, referring to Fig. 1.1. The apparatus has been set up for you. Fig. 1.1 The rule has one end taped to the bench so that it does not slip. The rule is attached to a spring. Do not change the position of the spring. (a) Place a mass m = 10 g on the rule at the 90.0 cm mark. (b) Measure and record the angle  between the rule and the bench. (c) Repeat steps (a) – (b) using mass values of 20 g, 30 g, 40 g and 50 g. (d) Complete the column headings in the table. (e) A student suggests that  is directly proportional to m. State with a reason whether or not your results support this suggestion. spring metre rule mass bench clamp h 2 0625/05/O/N/05 © UCLES 2005 © UCLES 2005

(f) A student carried out this experiment using a 360° protractor, as shown in 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. Fig. 1.2 (g) The range of angles measured in this experiment may be quite small. Using the same apparatus, 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. 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 0625/05/O/N/05 [Turn over © UCLES 2005 © UCLES 2005

2 In this experiment you are to investigate the resistance of resistance wire in different circuit arrangements. Record all your observations and readings on page 3 of your Answer Booklet. The circuit shown in Fig. 2.1 has been set up for you. The circuit includes only section AB of the resistance wire. Fig. 2.1 (a) Switch on. Measure and record in the table the current I in the circuit and the p.d. V across the section of resistance wire. Switch off. (b) Calculate the resistance R using the equation R = . Record this value of R in the table. (c) Complete the column headings for each of the I, V and R columns of the table. V ––I A C D B power source A V 4 0625/05/O/N/05 © UCLES 2005 © UCLES 2005

(d) Adjust the circuit to include section AC of the resistance wire, as shown in Fig. 2.2. Fig. 2.2 (e) Repeat steps (a) and (b). (f) Use a connecting lead to connect A to D. The rest of the circuit should stay as shown in Fig. 2.2. (g) Repeat steps (a) and (b). (h) Draw a circuit diagram, using standard symbols, showing the circuit described in (f). Use the symbol for a resistor to represent each section AB, BC and CD of the resistance wire. A C D B power source A V 5 0625/05/O/N/05 [Turn over © UCLES 2005 © UCLES 2005

3 In this experiment you are to investigate the effect of insulation on the rate of cooling of hot water. Record all your observations on pages 4 and 5 of your Answer Booklet. Carry out the following instructions, referring to Fig. 3.1. Fig. 3.1 You are provided with two beakers labelled A and B. Beaker B is insulated. Do not remove this insulation. You also have a supply of hot water. (a) Pour hot water into beaker A until it is approximately two thirds full. (b) Measure the temperature  of the hot water. Record this temperature in the table for time t = 0 s. (c) Start the stopwatch and then record the temperature of the water at 30 s intervals for a total of four minutes. (d) Complete the column headings in the table. (e) Use the data in the table to plot a graph of  (y-axis) against t (x-axis). Draw the best fit curve. (f) Repeat steps (a) – (d) using beaker B. (g) Use the data obtained from part (f) to plot another curve on the same graph axes that you used for part (e). (h) 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. thermometer insulation B A 6 0625/05/O/N/05 © UCLES 2005

4 In this experiment you are to investigate reflection in a plane mirror. Record all your observations on pages 6 and 7 of your Answer Booklet. Carry out the following instructions, referring to Fig. 4.1. Fig. 4.1 (a) On page 7 of the Answer Booklet, the line MM' shows the position of the mirror. Draw a normal to this line at its centre. (b) Place page 7 of the Answer Booklet on the pin board. Place the mirror, with its reflecting face vertical, on the line MM'. (c) Place the card so that it stands vertically with end B on the normal line and at a distance x = 5.0 cm from the mirror. The card must be parallel to the mirror. (d) Draw a line from the edge A of the card to the point where the normal meets the line MM'. Place a pin P1 in this line, close to MM'. Label the position of P1. (e) View the image of the edge A of the card in the mirror and position two pins P2 and P3 some distance apart so that pins P3, P2, P1 and the edge A of the card all appear exactly one behind the other. Label the 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 the angle of reflection r between the normal and line P2P3. (h) Repeat the steps (c) – (g) using values of x of 10.0 cm and 15.0 cm. (i) In spite of carrying out this experiment with care, it is possible that the values of the angle of reflection r will not be exactly the same as the values obtained from the theory. Suggest two possible causes of this inaccuracy. eye A P2 P1 B P3 M M' normal normal x mirror card 7 0625/05/O/N/05 © 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 0625/05 Paper 5 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 5 © University of Cambridge International Examinations 2005 1 (a) – (d) m in g, θ in degrees [1] 5 decreasing θ values [1] 5 sensible θ values [1] evidence of θ to better than nearest 5o [1] (e) no [1] as m increases, θ decreases [1] (f) good, clear diagram showing ‘unused’ part of protractor OR description [1] diagram shows way of coping (e.g. taping to bench so 0-180 line is level with bench top) OR description [1] (g) good clear diagram showing (for example) rule at far end of rule to measure depression OR description [1] clear on diagram that rule is vertical (e.g. use set square) or clamped at constant angle OR description [1] [TOTAL 10] 2 (a) – (g) I in A, V in V, R in Ω [1] all I to 1 dp or better [1] all V to 1 dp or better [1] all R values correct arith [1] consistent 2 or 3 sf for R [1] AC R value 2 x AB value (+ 10%) [1] final R value 0.67 x AB value (+ 10%) [1] (h) diagram: all components shown by correct symbols [1] all components correctly connected [1] ammeter correctly in series and voltmeter correctly in parallel [1] [TOTAL 10]

Page 2 Mark Scheme Syllabus Paper IGCSE – NOVEMBER 2005 0625 5 © University of Cambridge International Examinations 2005 3 (b) – (d) and (f) θ in o, t in s [1] 9 decreasing temperatures in first table [1] 9 decreasing temperatures in second table [1] (e) and (g) y axis labelled [1] suitable temperature scale (e.g. not ‘3’ scale) with false origin so that plots use more than half available space [1] plots correct to ½ small square (−1 each error) [2] well judged best fit curves [1] (h) Two from: e.g. use a lid insulate the bottom of the beaker use a container that is a good conductor (metal) use same volume/mass of water [2] [TOTAL 10] 4 (a) – (f) trace normal at 90o (by eye) [1] all lines and rays in approx correct positions [1] neat lines (not too thick) [1] one P2P3 distance > 5 cm [1] all P2P3 distance > 5 cm [1] r values within 2o of values on trace [1] (g) – (h) 3 sets of x and r [1] r values 45o, 27o, 18o (all + 2o) [1] (i) Two from: e.g. thickness of mirror thickness of lines thickness of pins [2] [TOTAL 10]