Cambridge IGCSE Physics 0625 — 2002 Oct/Nov Paper 2 · Variant 1

TIME 1 hour INSTRUCTIONS TO CANDIDATES Write your name, Centre number and candidate number in the spaces at the top of this page. Answer all questions. Write your answers in the spaces provided on the question paper. INFORMATION FOR CANDIDATES The number of marks is given in brackets [ ] at the end of each question or part question. 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). International General Certificate of Secondary Education CAMBRIDGE INTERNATIONAL EXAMINATIONS PHYSICS 0625/2 PAPER 2 OCTOBER/NOVEMBER SESSION 2002 1 hour Candidates answer on the question paper. No additional materials are required. This question paper consists of 17 printed pages and 3 blank pages. SP (CW/SLC) S23398/3 © CIE 2002 [Turn over Candidate Centre Number Number Candidate Name FOR EXAMINER’S USE www.XtremePapers.com

2 0625/2/O/N/02 1 A baggage handler at an airport lifts a suitcase from the ground and places it on a moving belt. The moving belt then transfers the suitcase to the owner. Fig. 1.1 (a) (i) How does the total energy of the suitcase in B compare with its energy in A? Tick one box. The total energy is greater in B than in A. The total energy is the same in B and in A. The total energy is less in B than in A. (ii) Explain your answer. … … [2] moving belt A suitcase on ground B suitcase held level with belt C suitcase moving on belt For Examiner’s Use

3 0625/2/O/N/02 (b) (i) How does the total energy of the suitcase in C compare with its energy in B? Tick one box. The total energy is greater in C than in B. The total energy is the same in C and B. The total energy is less in C than in B. (ii) Explain your answer. … … [2] 2 Here are five words relating to the transfer of thermal energy. conductor, convection, evaporation, insulator, radiation Complete each of the following sentences by writing in the appropriate word from the list. (a) Cooking pots often have a wooden handle, because wood is a good thermal … . [1] (b) Thermal energy reaches Earth from the Sun by means of … [1] (c) Copper is a good … of thermal energy. [1] (d) The heating element is put at the bottom of an electric kettle, so that … can rapidly transfer thermal energy throughout the water. [1] For Examiner’s Use [Turn over

4 0625/2/O/N/02 3 Fig. 3.1 shows a vertical wire through a horizontal piece of card. There is a current down the wire. Fig. 3.1 Fig. 3.2 shows the wire and card, viewed from above. Fig. 3.2 The large circle is one of the magnetic field lines caused by the current. On Fig. 3.2, (a) show the direction of the magnetic field, [1] (b) carefully draw three more magnetic field lines. [2] card large current card For Examiner’s Use

5 0625/2/O/N/02 4 In an experiment to find the density of some oil, a student takes the following readings. Fig. 4.1 Fig. 4.2 (a) (i) Calculate the mass of oil in the jug. mass of oil =… g (ii) Calculate the density of the oil. density of oil =… (iii) How could the volume of the oil be more accurately measured than with the measuring jug? … [7] (b) Water is more dense than oil. On Fig. 4.3, mark approximately where the surface of the same mass of water would be if it replaced the oil. [1] Fig. 4.3 100 200 300 400 500 cm3 level of oil 100 200 300 400 500 cm3 mass of jug containing 500cm3 of oil = 1020g oil 100 200 300 400 500 cm3 mass of empty measuring jug = 610g For Examiner’s Use [Turn over

6 0625/2/O/N/02 5 (a) What happens to the nucleus of an atom that undergoes radioactive decay? … …[1] (b) Strontium-90 has a half-life of 28 years. How much time must pass before its activity falls to
 of its original value? time = … years [2] 6 (a) State what is meant by the melting point of a solid. The melting point is … …[2] (b) Which two of the following quantities are the same? Tick two boxes. boiling point of iron freezing (solidifying) point of iron melting point of iron [1] For Examiner’s Use

7 0625/2/O/N/02 (c) Some liquid in a beaker is kept boiling by heating the beaker, as shown in Fig. 6.1. Fig. 6.1 (i) On the axes of Fig. 6.2, sketch a graph to show what happens to the temperature of the liquid whilst it is boiling. Fig. 6.2 (ii) On your graph, mark the boiling point of the liquid. [2] 0 time temperature time at which liquid starts to boil boiling liquid heat For Examiner’s Use [Turn over

8 0625/2/O/N/02 7 A student holds a polythene rod in one hand and a dry cotton cloth in the other. Fig. 7.1 (a) How can the student cause the rod to become charged with static electricity? …[1] (b) How can the student detect that the rod has become charged? …[1] (c) Around the charged rod will be an electric field. What is meant by an electric field ? … …[2] polythene rod dry cotton cloth For Examiner’s Use

9 0625/2/O/N/02 (d) The charged polythene rod is brought close to another charged polythene rod that has been suspended from a nylon thread, as shown in Fig. 7.2. Fig. 7.2 (i) What is seen to happen to the suspended rod? … (ii) Explain why this happens. … [2] (e) If the student used a copper rod in (a), instead of the polythene rod, why would he not be able to charge the rod? … …[1] charged polythene rod (–) charged polythene rod (–) nylon thread For Examiner’s Use [Turn over

10 0625/2/O/N/02 8 Fig. 8.1 shows an electric circuit containing a battery, a 4.7 Ωresistor, an ammeter and a variable resistor with a sliding contact. The variable resistor is set at zero. The ammeter and battery have such a small resistance that it can be ignored. Fig. 8.1 (a) In what unit do we measure the e.m.f. of the battery? …[1] (b) Write down the equation that links resistance, potential difference (p.d.) and current. [2] (c) The ammeter shows that the current through the 4.7 Ωresistor is 0.5 A. Calculate the p.d. across the resistor. p.d. across resistor = … [2] (d) The sliding contact of the variable resistor is moved from X to Y. (i) What happens to the resistance of the variable resistor? … (ii) What happens to the reading on the ammeter? … [2] (e) The variable resistor is now adjusted to make the total resistance of the circuit 10.0 Ω. What is the resistance of the variable resistor now? resistance of variable resistor = … Ω [2] A X Y 4.7Ω sliding contact variable resistor For Examiner’s Use

11 0625/2/O/N/02 9 A student wrote the following report about an experiment to measure the speed of sound in air. My friend and I went into a field a long way from any buildings and measured the distance across the field. My friend stood at one side of the field and I stood at the other. My friend banged two pieces of wood together, and as I saw him do this, I started a stopwatch. I stopped the stopwatch when I heard the sound. We obtained the following readings. distance across field = 238 m time for sound to cross field = 0.7 s (a) Why was it necessary to be a long way from any buildings? …[1] (b) Why was it necessary to use such a large distance? …[1] (c) Suggest what the students could have used to measure the distance across the field. …[1] (d) Why was there a delay between the student seeing the pieces of wood come together and hearing the bang? … …[2] (e) Use the readings to calculate the speed of sound. speed of sound = … [4] (f) Suggest why it might have been a good idea for the students to repeat the experiment after they had exchanged positions. … …[1] For Examiner’s Use [Turn over

12 0625/2/O/N/02 10 (a) The apparatus shown in Fig. 10.1 can be used to indicate when there is a force on the copper rod. Fig. 10.1 (i) Suggest what is seen to happen to the hanging copper rod when the switch is closed. … … (ii) Explain your answer. … … (iii) The cell is reversed and the switch closed. How does what is seen now differ from what you described in (a)(i)? … [4] S N hanging copper rod mercury For Examiner’s Use

13 0625/2/O/N/02 (b) Fig. 10.2 represents a d.c. motor. Fig. 10.2 (i) In the boxes, label the various parts of the motor. One part has been labelled as an example. (ii) Which part of the motor ensures that the coil keeps rotating when the battery is connected? … (iii) The battery is reversed. What difference does this make to the motor? … [5] N S coil For Examiner’s Use [Turn over

14 0625/2/O/N/02 11 (a) Fig. 11.1 shows a reed relay in a simple circuit. Fig. 11.1 Explain why the iron reeds touch each other when switch S is closed. … … …[4] S lamp flexible iron reeds For Examiner’s Use

15 0625/2/O/N/02 (b) Fig. 11.2 shows a simple temperature-operated alarm. Fig. 11.2 When the thermistor is cold, its resistance is too high to allow sufficient current to operate the reed relay. The resistance of the thermistor decreases as the temperature increases. Describe what happens to make the warning lamp light as the air temperature changes. … … … … …[4] warning lamp thermistor For Examiner’s Use [Turn over

16 0625/2/O/N/02 12 (a) A narrow beam of red light strikes one face of a triangular prism at A, as shown in Fig. 12.1. Fig. 12.1 (i) On Fig. 12.1, show the path of the beam until it reaches the screen. (ii) What name do we use to describe what happens to the beam at A? … [4] A red light screen For Examiner’s Use

17 0625/2/O/N/02 (b) The red light is replaced by a narrow beam of mixed red and violet light, as shown in Fig. 12.2. Fig. 12.2 Complete Fig. 12.2 to show what happens to the red and the violet light. [2] (c) The beam of red and violet light is replaced by a narrow beam of white light from the Sun. State what is now seen on the screen. …[1] (d) The rays from the Sun also include infra-red rays. Infra-red radiation can pass through glass. (i) On Fig. 12.2, mark with the letter X the place where infra-red radiation from the Sun might strike the screen after passing through the prism. (ii) Why can infra-red not be seen on the screen? … (iii) What could be used to detect the infra-red radiation? … [3] red + violet light screen For Examiner’s Use

CAMBRIDGE INTERNATIONAL EXAMINATIONS NOVEMBER 2002 INTERNATIONAL GCSE UNIVERSITY of CAMBRIDGE Local Examinations Syndicate

Page 1 Mark Scheme Syllabus Paper | IGCSE Examinations — November 2002 0625 2) QU. SCHEME TARGET MARK : GRADE (a) (i) greater : F Mi (ii) P.E. (or equiv.) has increased OR work done lifting case F Al (b) (i) greater F Mi (ii) itis moving OR now has K_E. (or equiv.) F AL (a) insulator F -Bl (b) radiation F Bl (c) conductor F Bl (d) convection F BL 4 (a) arrow(s) clockwise Cc Bi (b) 3 circles (by eye) around wire (need not be concentric, ignore other lines) F Bl circles concentric with wire (by eye) c ” BL (a) () 1020-610 F Cl 410 (g) F Al (ii) mass/volume F Cl his (i)/500 F Cl 0.82 e.c.f. F Al g/cm c Bi (iii) use measuring cylinder/pipette/narrower jug [bacette. Cc Bl (b) level shown below oil level Cc ke

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