Cambridge IGCSE Physics 0625 — 2003 Oct/Nov Paper 6 · Variant 1

This document consists of 11 printed pages and 1 blank page. MML 4504 11/02 S53410/3 © UCLES 2003 [Turn over CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education PHYSICS 0625/06 Paper 6 Alternative to Practical October/November 2003 1 hour Candidates answer on the Question Paper. No Additional Materials are required. Centre Number Candidate Number Name UNIVERSITY of CAMBRIDGE Local Examinations Syndicate For Examiner’s Use 2 1 3 4 5 Total 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. www.XtremePapers.com

1 (a) A student was asked to make some measurements of the test-tube shown in Fig. 1.1. He was given a 1 m length of thin string and a metre rule and instructed to determine as accurately as possible the circumference of the tube. The student used the rule to measure the diameter d of the tube and then calculated the circumference c using the equation c =
d. Describe how the student could have obtained a more accurate result with the apparatus given. You may draw on Fig. 1.1. Fig. 1.1 … … … [2] (b) (i) On Fig. 1.2, show where you would place two small rectangular blocks of wood to help you make an accurate measurement of the overall length of the test-tube. Fig. 1.2 (ii) The test-tube is shown actual size in Fig. 1.2. Use your rule to measure the length l of the test-tube. l = … [2] 2 0625/06/O/N/03 For Examiner’s Use

(c) Using another test-tube, the student obtained these readings. l = 14.5 cm c = 5.3 cm Calculate the approximate external volume V of the test-tube using the student’s readings and the equation c 2l V = –– . 4
V = … [2] (d) The equation used in (c) assumes the test-tube to be a cylinder with flat ends. It does not allow for the rounded end of the test-tube. (i) Estimate the volume Vm of the ‘missing’ part of the cylinder shown shaded in Fig. 1.3. Fig. 1.3 Vm = … (ii) Using your values for V and Vm, calculate the actual external volume Va of the test-tube. Va = … [2] 3 0625/06/O/N/03 [Turn over For Examiner’s Use

2 Fig. 2.1 shows a ray tracing sheet obtained by a student carrying out a reflection of light experiment using pins and a plane mirror. Fig. 2.1 The student looks into the mirror MM' and views the images of pins A and B. He then places pins C and D so that pins C and D and the images of pins A and B appear to be in line. (a) On Fig. 2.1, (i) draw the incident ray in this experiment, (ii) draw the reflected ray, (iii) draw a normal at the point where the incident ray meets the mirror, (iv) measure the angle of incidence i. i = … [3] B C E A D F M mirror M' 4 0625/06/O/N/03 For Examiner’s Use

(b) The student moves pin B and then repeats the experiment, obtaining the reflected ray EF. (i) On Fig. 2.1, continue the lines CD and EF behind the mirror to find the point where they meet. Label this point X. (ii) Draw the line AX. Label with the letter Y the point where line AX crosses the mirror MM'. (iii) Use your rule to measure the distances AY and YX. AY = … YX = … [2] (c) According to theory, AY = YX. Suggest why, in spite of very careful work, the student’s values may have been slightly different. … … [1] 5 0625/06/O/N/03 [Turn over For Examiner’s Use

3 (a) Fig. 3.1 shows the scale of an ammeter. Draw the position of the pointer when the ammeter reading is 0.35 A. [1] Fig. 3.1 (b) The ammeter was used in the circuit shown in Fig. 3.2 to investigate the current in a lamp. Fig. 3.2 (i) Name the component labelled Y. … V A Y A 1.0 0.8 0.6 0.4 0.2 0 6 0625/06/O/N/03 For Examiner’s Use

(ii) The table shows the current I in the lamp for different values of the p.d. V across the lamp. 1. Calculate the values for the resistance R of the lamp, using the equation R = . Write your answers in the table. 2. Complete the column headings in the table. (iii) Suggest how the value of V could be varied. … … [8] (c) Fig. 3.3 shows a power source connected to three resistors labelled X, Y and Z. Fig. 3.3 Complete the diagram to show (i) a voltmeter connected to measure the voltage across the resistors, (ii) an ammeter connected to measure the current in resistor X only, (iii) connecting wires to complete the circuit. [3] X Y Z power source V –I 7 0625/06/O/N/03 [Turn over For Examiner’s Use V / I / R / 1.9 0.31 1.5 0.26 0.8 0.20

4 The IGCSE class was studying the acceleration a of a toy truck that was pulled along a track by a force F. The arrangement is shown in Fig. 4.1. Fig. 4.1 The results obtained are shown in the table. (a) Plot a graph of F / N (y-axis) against a / (m / s2) (x-axis). Draw the line of best fit through your points. [6] F truck 8 For Examiner’s Use F / N a / (m / s2) 0.5 0.35 1.0 0.72 1.5 1.02 2.0 1.44 2.5 1.74 0625/06/O/N/03

(b) Theory suggests that the relationship between force and acceleration is given by the equation F = ma, where m is the mass of the truck. The gradient of the graph is equal to the mass of the truck. From the graph, determine the mass m of the truck. Show clearly how you obtained the necessary information. m = … [4] 9 0625/06/O/N/03 [Turn over For Examiner’s Use

5 A student wants to find out which of the three materials is the best thermal insulator. The student’s apparatus at the beginning of each test is as shown in Fig. 5.1. Fig. 5.1 Each beaker is surrounded by a different insulating material. The water is allowed to cool and the temperatures are recorded at different times. The student is unable to write a correct conclusion because the variables have not been controlled. (a) Study Fig. 5.1 and then state two ways in which you would improve the control of variables. 1. … … 2. … … [2] (b) State the reading shown on the thermometer shown in Fig. 5.2. Fig. 5.2 temperature reading … [1] 110 100 90 80 70 60 50 40 30 20 10 0 °C 200cm3 of water at 80°C 100cm3 of water at 80°C 100cm3 of water at 70°C material 1 material 2 material 3 beaker A beaker B beaker C 10 0625/06/O/N/03 For Examiner’s Use

(c) The graph of Fig. 5.3 shows the results obtained by the student. The graph lines A, B and C correspond to the beakers A, B and C. Fig. 5.3 Which beaker cools the most quickly in the first 60 s? … [1] 80 90 70 60 50 40 30 20 10 0 0 20 40 60 80 100 120 140 160 180 200 A B C temperature/°C time/s 11 0625/06/O/N/03 For Examiner’s Use