Cambridge IGCSE Physics 0625 — 2006 May/June Paper 2 · Variant 1

This document consists of 16 printed pages. MML 10757 3/05 S99216/2 © UCLES 2006 [Turn over UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education PHYSICS 0625/02 Paper 2 Core May/June 2006 1 hour 15 minutes Candidates answer on the Question Paper. No Additional Materials are required. 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. 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. You may lose marks if you do not show your working or if you do not use appropriate units. Take the weight of 1 kg to be 10 N (i.e. acceleration of free fall = 10 m/s2). 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. Centre Number Candidate Number Name For Examiner’s Use www.XtremePapers.com

1 (a) For a special parade, the guest of honour is to sit on a chair whilst the parade passes by. Unfortunately the ground beneath the chair is soft, so the parade organisers put the chair on a large flat board, as shown in Fig. 1.1. Fig. 1.1 Explain why the board prevents the chair from sinking into the ground. … … [2] (b) At the parade, some air-filled balloons are used as decorations, as shown in Fig. 1.2. Fig. 1.2 (i) State what happens to the balloons when the Sun makes them hotter. … [1] (ii) In terms of molecules, explain your answer to (b)(i). … … [2] chair board soft ground 2 For Examiner's Use 0625/02/M/J/06 © UCLES 2006

(c) A pump is used to pump up the balloons in (b). A valve in the pump becomes blocked, as shown in Fig. 1.3. Fig. 1.3 (i) The piston of the pump is pushed in. State what happens to the pressure of the air trapped in the pump. … [1] (ii) In terms of molecules, explain your answer to (c)(i). … … [3] blocked valve air piston direction of motion of piston 3 [Turn over For Examiner's Use © UCLES 2006 0625/02/M/J/06

2 Fig. 2.1 is a full-size diagram of a rectangular block. Fig. 2.1 (a) Use your rule to measure the lengths of the three sides AB, BC and CD. Write your values below, in cm, to 2 significant figures. length of AB = … cm length of BC = … cm length of CD = … cm [2] (b) Write down the equation you would use to calculate the volume of the block. Do not attempt a calculation. [1] (c) If you used your values from (a), what would be the unit for the volume of the block? unit of volume = … [1] A B C D 4 For Examiner's Use 0625/02/M/J/06 © UCLES 2006

3 Fig. 3.1(a) shows a measuring cylinder, containing some water, on a balance. Fig. 3.1(b) shows the same arrangement with a stone added to the water. Fig. 3.1 (a) Which two readings should be subtracted to give the volume of the stone? reading … and reading … [1] (b) Which two readings should be subtracted to give the mass of the stone? reading … and reading … [1] (c) In a certain experiment, mass of stone = 57.5 g, volume of stone = 25 cm3. (i) Write down the equation linking density, mass and volume. [1] (ii) Calculate the density of the stone. density of stone = … [3] measuring cylinder water balance reading R reading P reading Q stone reading S (a) (b) 5 [Turn over For Examiner's Use 0625/02/M/J/06 © UCLES 2006

4 A piece of fruit is falling from a tree. Fig. 4.1 (a) The list below contains the names of some different forms of energy. Put a tick in the box alongside four that are possessed by the falling fruit. chemical electrical gravitational (PE) internal (thermal) kinetic (KE) light sound strain [4] (b) Which form of energy increases as the fruit falls? … [1] (c) Which form of energy decreases as the fruit falls? … [1] (d) Which form of energy is stored in the body of a person as a result of eating the fruit? … [1] 6 For Examiner's Use 0625/02/M/J/06 © UCLES 2006

5 (a) State two changes that usually happen to the molecules of a solid when the solid is heated. 1. … 2. … [2] (b) Most substances expand when they are heated. (i) State one example where such expansion is useful. … [1] (ii) State one example where such expansion is a nuisance, and has to be allowed for. … [1] 6 Fig. 6.1 shows a section through a series of waves on water. Fig. 6.1 (a) On Fig. 6.1, carefully mark and label (i) the wavelength of the waves, [2] (ii) the level of the flat, still water surface after the waves have passed. [2] (b) Describe how, using a stopwatch, the frequency of the waves could be found. … … … [2] 7 [Turn over For Examiner's Use 0625/02/M/J/06 © UCLES 2006

7 (a) Fig. 7.1 shows a ray of blue light shining onto a glass prism. Fig. 7.1 With the aid of a straight edge, draw a possible path of the ray through the prism and into the air until it reaches the screen. [3] (b) When a ray of white light passes through the prism, it spreads into a spectrum of colours that can be seen on the screen. (i) What is the name of this spreading effect? Tick one box. convergence diffraction dispersion reflection [1] (ii) Which colour is deviated least by the prism? … [1] (iii) Which colour is deviated most by the prism? … [1] screen air air normal ray of blue light 8 For Examiner's Use 0625/02/M/J/06 © UCLES 2006

8 (a) State what is meant by the north pole of a magnet. … … [2] (b) The north poles of two magnets are brought close together. What sort of force, if any, is there between the poles? Tick one box. attractive repulsive no force [1] (c) Fig. 8.1 shows the north pole of a magnet close to an iron bar. Fig. 8.1 (i) The iron bar is attracted to the north pole because of induced magnetism in the iron bar. On Fig. 8.1, mark clearly the induced north pole and the induced south pole of the iron bar. [1] (ii) State what happens to the induced magnetism in the iron bar when the magnet is taken away. … [1] N magnet iron bar 9 [Turn over For Examiner's Use 0625/02/M/J/06 © UCLES 2006

9 (a) The table below gives the half-lives of three radioactive substances. Samples of each of the three substances have the same activity today. Which sample will have the greatest activity in 1 year’s time? Explain your answer. substance with greatest activity after 1 year … explanation … … [2] (b) In 1986, an explosion at the Chernobyl nuclear power station released radioactive substances into the air. One of the radioactive substances released was iodine-131. Some of the iodine-131 found its way into cow’s milk. The activity of a sample of this contaminated milk was measured each week for 4 weeks. The results are shown below. 10 For Examiner's Use 0625/02/M/J/06 © UCLES 2006 time / days 0 7 14 21 28 1000 547 294 162 88 activity ––––––– counts / s substance half-life iodine-128 radon-222 strontium-90 25 minutes 3.8 days 28 years

(i) On Fig. 9.1, plot the values given in the table. Fig. 9.1 (ii) Draw the best-fit curve through your points. (iii) Use your graph to find the half-life of iodine-131, showing clearly on your graph how you obtained your value. half-life of iodine-131 = … days [6] 1000 800 600 400 200 0 0 5 10 15 20 25 30 activity counts _______ / s time / days 11 [Turn over For Examiner's Use 0625/02/M/J/06 © UCLES 2006

10 (a) Fig. 10.1 shows a type of tube in which cathode rays can be produced. Fig. 10.1 (i) A p.d. is connected between two terminals in order to cause thermionic emission. Between which two of the four labelled terminals is the p.d. connected? between point … and point … [1] (ii) Where does the thermionic emission occur? … [1] (iii) What particles are emitted during thermionic emission? Tick one box. -particles electrons neutrons protons [1] (iv) On Fig. 10.1, draw the path of the cathode rays that are created when all the electrical connections are correctly made. [1] (v) State what is seen when the cathode rays strike the fluorescent screen. … [1] filament anode fluorescent screen A B C D 12 For Examiner's Use 0625/02/M/J/06 © UCLES 2006

(b) Fig. 10.2 shows the same tube as in Fig. 10.1, with two metal plates alongside the tube. A high p.d. is connected between the plates. Fig. 10.2 On Fig. 10.2, draw the path of the cathode rays. [3] (c) The tube in Fig. 10.1 and Fig. 10.2 has a vacuum inside it. State why this vacuum is necessary. … … [1] +V –V 13 For Examiner's Use 0625/02/M/J/06 © UCLES 2006 [Turn over

11 Fig. 11.1 illustrates part of the journey of a car. Fig. 11.1 The car engine is leaking oil. Regularly, every 2.5 s, a drop of oil hits the road. (a) The car is driven at a steady speed of 10 m/s through the town. (i) Calculate the distance on the road between one oil drop and the next oil drop. distance between oil drops = … m [2] (ii) The town is 500 m across. Show that it takes the car 50 s to travel through the town. [3] (b) At a distance of 1000 m outside the town, the car passes a tree. At a further distance of 1500 m, the car passes a pylon. Between the tree and the pylon the oil drops are all 75 m apart. Calculate the speed of the car between the tree and the pylon. speed of car = … m/s [2] start of town end of town oil drops on road tree pylon 500 m 1000 m 1500 m 14 For Examiner's Use 0625/02/M/J/06 © UCLES 2006

(c) What has happened to the car between the end of the town and the tree? Tick one box. The car has accelerated. The car has decelerated. The car has travelled at constant speed. [1] (d) Each of the three parts of the journey takes 50 s. Calculate the average speed of the car for the whole journey between the beginning of the town and the pylon. average speed = … m/s [5] 15 For Examiner's Use 0625/02/M/J/06 © UCLES 2006 [Turn over

12 In the boxes of the left column below are some electrical hazards. In the boxes of the right column are means of protecting against those hazards. From each hazard, draw a line to the appropriate protection. One line has been drawn as an example. [3] 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. 16 For Examiner's Use 0625/02/M/J/06 © UCLES 2006 electrical hazard loose live wire touches metal case of appliance fuse or circuit-breaker in the circuit use of switches with a nylon pull-cord earth wire connected to the metal case of the appliance visual check of cables before connecting appliance worn insulation on cable to an appliance steam in a washroom condenses inside a switch wires get hot because current is too high means of protection

UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education MARK SCHEME for the May/June 2006 question paper 0625 PHYSICS 0625/02 Paper 2, maximum raw mark 80 These mark schemes are published as an aid to teachers and students, to indicate the requirements of the examination. They show the basis on which Examiners were initially instructed to award marks. They do 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 May/June 2006 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 – May/June 2006 0625 02 © University of Cambridge International Examinations 2006 TARGET GRADE MARK 1 (a) larger area F B1 smaller pressure F B1 (b) (i) get larger OR get firmer F B1 (ii) molecules move faster ) more collisions (per second) ) any 2 2C B1 + B1 pressure increased ) (c) (i) increases F B1 (ii) smaller volume F B1 more collisions (per second) C B1 anywhere in (b)(ii) or (c)(ii), collisions with walls C B1 9 2 (a) 6.0 ± 0.1 ) 2.4 ± 0.1 ) -1 each error or omission 2F B2 3.1 ± 0.1 ) (b) AB x BC x CD OR l x b x h OR his figures shown multiplied F B1 (c) cm3 OR cu.cm OR cubic cm F B1 4 3 (a) P and Q F B1 (b) R and S F B1 (c) (i) D = M/V in any form, including our figures F B1 (ii) 57.5/25 C C1 2.3 C A1 g/cm3 C B1 6 4 (a) chemical, gravitational, internal, kinetic 2F,2C B1 x 4 (if more than 4 ticked, use ✓ +  = 0 ) (b) kinetic NOT internal F B1 (c) potential F B1 (d) chemical C B1 7 5 (a) idea of greater speed F B1 idea of molecules further apart C B1 (b) (i) any suitable example involving expansion or contraction e.g. thermometer, thermostat, bimetal strip, rivets, fitting steel tyres F B1 (ii) any suitable example involving expansion or contraction e.g. expansion gaps in bridges etc, overhead cables, cracking glass C B1 4

Page 2 Mark Scheme Syllabus Paper IGCSE – May/June 2006 0625 02 © University of Cambridge International Examinations 2006 6 (a) (i) wavelength labelled clearly ± 3mm F C1 wavelength labelled clearly ± 1mm C A1 (ii) horizontal line F M1 anywhere between top & bottom of wave pattern C A1 (b) (measure time for) (count number of) (measure time) (a number of ) OR (waves passing ) OR (for 1 wave ) F M1 (waves to pass ) ( ) (to pass ) f = no. of waves OR in 1 second OR f = 1/T F A1 time 6 7 (a) ray bent down at first surface F M1 not below normal F A1 ray bent down at second surface C B1 (b) (i) dispersion ticked F B1 (ii) red C B1 (iii) violet C B1 (allow B1,B0 if red and violet both written but interchanged) 6 8 (a) end/point on magnet C B1 idea of pointing N (when freely suspended) F B1 (b) repulsive F B1 (c) (i) S at top and N at bottom F B1 (ii) disappears F B1 5 9 (a) strontium-90 F M1 decays most slowly OR longest half-life F A1 (b) (i) points correctly plotted ± ½ small square -1 each error or omission 3F B3 (ii) reasonable curve F B1 (iii) 8 (days) ± 0.5 OR his correct value ± 0.5 C B1 correct working shown on graph (minimum: dot on line) C B1 8 10 (a) (i) A and B (both) OR A and C (both) C B1 (ii) filament F B1 (iii) electrons ticked F B1 (iv) line along axis (by eye) OR conical beam along axis F B1 (v) light or glow indicated somehow F B1 (b) beam deflection shown F C1 beam deflected upwards C A1 indication of curve (condone curve outside electric field) C B1 (c) idea of no obstruction for cathode rays/electrons C B1 9

Page 3 Mark Scheme Syllabus Paper IGCSE – May/June 2006 0625 02 © University of Cambridge International Examinations 2006 11 (a) (i) 10 x 2.5 F C1 25 (m) F A1 (ii) speed = distance/time in any form F C1 500/10 F M1 50 (s) F A1 (b) 75/2.5 C C1 30 (m/s) C A1 (c) accelerated F B1 (d) total distance = 3000 (m) F C1 total time = 150 (s) F C1 average speed = total distance/total time C C1 3000/150 C C1 20 (m/s) C A1 13 12 L1 joined to R3 or R1 F B1 L2 joined to R4 F B1 L4 joined to R1 F B1 3