Cambridge IGCSE Physics 0625 — 2007 Oct/Nov Paper 5 · Variant 1

This document consists of 9 printed pages, 3 blank pages and 1 Answer Booklet. MML 13215 4/06 T25798/3 © UCLES 2007 [Turn over UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education * 5 6 1 0 4 0 4 9 3 5 * PHYSICS 0625/05 Paper 5 Practical Test October/November 2007 1 hour 15 minutes Additional Materials: As listed in the Confidential Instructions READ THESE INSTRUCTIONS FIRST If you have been given an Answer Booklet, follow the instructions on the front cover of the Booklet. Write your Centre number, candidate number and name on all the work you hand in. Write in dark blue or black pen. Do not use staples, paper clips, highlighters, glue or correction fluid. Answer all questions. You are expected to record all your observations as soon as these observations 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

2 0625/05/O/N/07 © UCLES 2007 1 In this experiment you are to investigate the rate of cooling of hot water. Record all of your observations on pages 2 and 3 of your Answer Booklet. Carry out the instructions referring to Fig. 1.1. thermometer beaker Fig. 1.1 You are provided with a supply of hot water. (a) Measure and record room temperature
0. (b) Pour hot water into the beaker until it is about one-third full. (c) Measure and record the temperature
of the hot water and at the same time start the stopwatch. Record the temperature at time t = 0 s in the table. (d) Measure and record the temperature of the water in the beaker every 30 s for a total of five minutes. (e) Complete the column headings in the table. (f) (i) Calculate the temperature fall T1 in the first minute of your experiment. (ii) Calculate the temperature fall T2 in the final minute of your experiment.

3 0625/05/O/N/07 © UCLES 2007 [Turn over (g) Theory suggests that the rate of cooling of the hot water at any time depends on the difference between the temperature of the water at that time and room temperature. (i) State and explain whether your results support this theory. (ii) Suggest three variables that you would attempt to keep constant if you were to investigate this theory further. (h) Suggest one addition you could make to the apparatus provided in order to reduce the rate of evaporation of the water from the beaker.

4 0625/05/O/N/07 © UCLES 2007 2 In this experiment you are to investigate a simple balance. Record all of your observations on page 4 of your Answer Booklet. Carry out the following instructions referring to Fig. 2.1. stand card metre rule pointer 0 h0 pivot stand hook tape tape bench Fig. 2.1

5 0625/05/O/N/07 © UCLES 2007 [Turn over (a) Place the metre rule close to the end of the pointer as shown in Fig. 2.1 and record the height h0 of the pointer above the bench. (b) Hang one of the paper clips provided on the hook. Record the new height h of the pointer above the bench. (c) Calculate and record the height difference d using the equation d = (h – h0). (d) Repeat steps (b) and (c) using different numbers of paper clips, from N = 2 to N = 6. (e) Plot the graph of d / mm (y-axis) against N (x-axis). (f) Remove the paper clips from the hook. Hang the nail on the hook. Record the height hn of the pointer above the bench. (g) Use the graph to determine the number of paper clips that have the same mass as the nail. Show your working and give your answer to 1 decimal place.

6 0625/05/O/N/07 © UCLES 2007 3 In this experiment you will investigate the potential difference across lamps and the currents in the lamps. Record all of your observations and answers on page 5 of your Answer Booklet. Carry out the following instructions referring to Fig 3.1, which shows the circuit that has been set up for you. power source A lamp 1 lamp 2 lamp 3 V Fig. 3.1 (a) Close the switch. Record the current I, shown by the ammeter. Switch off. (b) Remove the ammeter from the circuit. Reconnect the ammeter to measure the current I1 in lamp 1. Close the switch. Record the current I1. Open the switch. (c) Repeat step (b) to measure and record the current I2 in lamp 2 and the current I3 in lamp 3.

7 0625/05/O/N/07 © UCLES 2007 [Turn over (d) Theory suggests that I = I1 + I2 + I3. State whether or not your readings support this theory. Give a reason for your answer. (e) To test the theory further you would need to vary the current I. State how you would vary the current I. (f) Connect the voltmeter across lamp 3. Close the switch. Measure and record the potential difference V across the lamps. Open the switch. (g) Calculate the resistance R of the lamps arranged in parallel using the equation R = V / I. (h) Connect the voltmeter across the switch. (i) Close the switch. Measure and record the potential difference Va across the switch. (ii) Open the switch. Measure and record the potential difference Vb across the switch.

8 0625/05/O/N/07 © UCLES 2007 4 In this experiment you will investigate the refraction of light through a transparent block. Record all of your observations and answers on page 6 of your Answer Booklet. Carry out the following instructions referring to Fig. 4.1, Fig. 4.2 and Fig. 4.3. line image of line paper direction of eye movement optics pin Fig. 4.1 h stand optics pin paper h stand optics pin paper Fig. 4.2 Fig. 4.3

9 0625/05/O/N/07 © UCLES 2007 (a) Draw a straight line approximately in the centre of the sheet of plain paper. (b) Stand the transparent block on the paper with one of its shortest sides over the line as shown in Figs 4.1 and 4.2. (c) Look, with one eye closed, vertically down through the block. You will see the image within the block of the pencil line you have drawn on the paper. (d) Place the optics pin horizontally with its point touching the transparent block approximately in the centre so that the pencil line and the pin appear to form one straight line. Move your eye slightly in a horizontal plane, as shown in Fig. 4.1. You will see that the image of the pencil line and the pin appear to separate. (e) Continue to look vertically down through the block and slowly move the pin downwards until you find a position where the pin and the image of the pencil line do not separate when you move your eye. (f) Without changing the position of the point of the pin that is touching the block, measure and record the vertical distance x between the paper and the pin. (g) Measure and record the height h of the transparent block. (h) Calculate the refractive index n of the material of the block using the equation n = h ––––– h –x . (i) Stand the transparent block on the paper with one of its longest sides over the line as shown in Fig. 4.3. (j) Repeat steps (c) to (h). (k) Calculate the average value of the refractive index n. (l) To obtain a reliable value for the vertical distance x between the paper and the pin it is important that the pin is horizontal. Explain briefly with the aid of a diagram how you checked that the pin was horizontal.

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12 0625/05/O/N/07 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 Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge. BLANK PAGE © UCLES 2007

UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education MARK SCHEME for the October/November 2007 question paper 0625 PHYSICS 0625/05 Paper 5 (Practical Test), maximum raw mark 40 This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began. 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 discussions or correspondence in connection with these mark schemes. CIE is publishing the mark schemes for the October/November 2007 question papers for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses. www.XtremePapers.com

Page 2 Mark Scheme Syllabus Paper IGCSE – October/November 2007 0625 05 © UCLES 2007 1 (a)–(e) t in s, θ in oC, and θ 0 (10 – 45) [1] Complete set of readings, temps decreasing [1] Evidence of θ to 1oC [1] (f) (i) T1, T2 correct arithmetic [1] (ii) T1 > T2 [1] (g) (i) reason consistent with results [1] (ii) Three from: room temp/draughts, etc. volume/mass/amount beaker/insulation/lid/surface liquid amount of stirring (not starting temperature) [3] (h) lid [1] [Total: 10] 2 (a) h0 25 – 100 cm with correct unit [1] (b)–(d) complete table h, d [1] correct arithmetic for d [1] all h to nearest mm [1] (e) Graph: suitable scale labelled symbol/unit [1] all plots to nearest ½ sq (–1 each error or omission) [2] line thin and well judged [1] (g) calculation of d correct [1] correct reading from graph to ½ square and to 1dp [1] [Total: 10]

Page 3 Mark Scheme Syllabus Paper IGCSE – October/November 2007 0625 05 © UCLES 2007 3 (a)–(c) 4 I values, sensible (watch for I x 10) [1] All I to at least 2 dp [1] I in A at least once [1] I = I1 + I2 + I3 + 10% [1] (d) statement (yes) reason consistent with readings [1] (e) variable resistor/extra cell/vary power supply/different number of lamps [1] (f) sensible V (< 3V), unit and at least 1 dp [1] (g) correct arithmetic for R [1] unit and 2/3 sf [1] (h) Va = 0, Vb = V [1] [Total: 10] 4 (f)–(h) sensible x value (less than h) [1] sensible h value (typical block: 10 cm) [1] x to nearest mm [1] x and h with same unit [1] correct arithmetic for n [1] (i)–(j) second different h value [1] (k) correct method for average n [1] 2/3 sf and no unit [1] both n values 1.4 – 1.6 [1] (l) two equal heights from bench (or other valid method) [1] [Total: 10]