Tips for answering spm paper

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Tips for answering spm paper

  1. 1. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER]EXAMINATION FORMATFormat of the Instrument for the Evaluation of Physics for SPM 4531 ITEM PAPER 1 (4531/1) PAPER 2 (4531/2) PAPER 3 (4531/3)Instrument types Objective Test Subjective test Written Practical testItem types Objective items: Subjective items: Subjective items: Multiple choices. - Section A: items. - Section A: Structured Each of item consist - Section B: Limited items. 3, 4, or 5 options A, responses and open - Section B: Open B, C, D, E. responses items. responses items. - Section C: Limited responses and open responses items.Number of questions 50 (answer all) - Section A: 8 (Answer - Section A: 2 (Answer all) all) - Section B: 2 (Choose - Section B: 2 (Choose one) one) - Section C: 2 (Choose one)Total marks 50 100 40Test period 1 hour 15 minutes 2 hours 30 minutes 1 hour 30 minutesCognitive domains Knowledge: 28% Knowledge: 11% Problems solving Understanding: 40% Understanding: 16% (Experimentation): 100% Applications: 32% Application: 18% Problems solving: 22% (Qualitative and quantitative) Conceptualization: 16% Making conclusion: 17%Marking Dichotomous marks: Analytical marking based Analytical marking based 1 or 0 on rubric scorings. on rubric scorings.Contextual cover Construct is assessed Construct is assessed Construct is assessed based on all learning based on all learning based on all learning domain. domain. domain.Difficulty levelLow: L L M H L M H L M HMedium: M 60% 24% 16% 38% 35% 27% 50% 30% 20%High: HAdditional devices Scientific calculator Scientific calculator Scientific calculator, protractor, 30 cm ruler. Answering Technique for SPM Physics | 2010 2
  2. 2. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER]ANSWER STRATEGY PHYSICS QUESTIONS PAPER 1 – Objective Questions (1 Hours 15Minutes)1. Paper 1 consists of 50 objective questions. You will have to answer all the 50 is in this paper. - 30 questions Easy - 12 questions Medium - 8 questions Difficult2. Each objective questions may have 3, 4 or 5 choices as follows: - A, B and C - A, B, C and D - A, B, C, D and E3. Majority of the questions come with 4 choices. Questions with 5 choices are usually reserved for questions that involve calculations.4. The time allocated for paper 1 is 1 hour 15 minutes or 75 minutes. The average time to answer one question is therefore 1½ minutes.5. Do not take more than 1½ minutes to answer each question. If you are unable to answer a particular question, leave it first. Spending too much time on one difficult question may result in not having enough time to answer other simpler questions.6. Study the formulae and information given before you start to answer any questions. Some of the formulae provided will be used to solve numerical problems and knowing their existence may provide you with a hint to answer questions that involve the use of formulae.7. Make sure that you know the usual meaning of symbols used in formulae in SPM Physics.8. Read each questions diligently to make sure that you understand the requirement of that questions. If information such as diagrams, graphs, or data is provided, make sure that you make use of them because they are provided with a purpose. Make sure that you know how to interpret the various types of graphs as well as make conclusions from graphs or data provided.9. One way to tackle difficult questions is to eliminate incorrect choices one by one until you are left with the best possible choice.10. Many of the questions are related to experiments carried out in the laboratory. As such, make sure that you know the purpose of every step in the experiments you carried out and make sure that you know the manipulated variable, the responding variable and the constant variable in a particular experiment.11. The objective questions in Paper 1 involve all the topics in the Physics syllabus. As such, you will have to make sure that you understand every topic well enough. Answering Technique for SPM Physics | 2010 3
  3. 3. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER]ANSWER STRATEGY PHYSICS QUESTIONS PAPER 2 – Subjective Questions (2 Hours 30Minutes)SECTION A1. Section A of paper 2 consists of 8 questions. You will have to answer all the 8 questions in this section.2. The marks allocated to each questions vary from 4 to 12 marks. The total in Section A is 60 marks.3. You are advised to spend 90 minutes on this section. Spending more than 90 minutes on this section will result in having insufficient time to answer questions in Sections B and C.4. The structured questions in Section A are usually based on diagrams, tables, graphs, or data related to a certain situations or phenomenon. It is therefore absolutely necessary for you to study the diagrams, tables, graphs or data provided before attempting to answer the questions.5. Before attempting to answer questions, read the questions at least twice and highlight the key words provided so that you will not go out of point.6. Do not force yourself to answer Questions 1 first if you are not too sure of the answers. Answer questions that you are most sure of first. By answering questions which you are quite sure of first will help you increases your confidence to answer the questions that you are not so sure of. Do not spend too much time on a particular question as it is very important that you answer or at least attempt to answer all the 8 questions within the 90 minutes allocated.7. Note the marks allocated to each section of a questions. A section that is allocated only 1 mark will require a short answer. It will be futile if you write a few lines for a section that is allocated only 1 mark. On the other hand, a section that is allocated 3 marks will require you to state 3 properties or characteristic associated with the particular section.8. While answering questions that involve calculations, make sure that you write down all the steps in the spaces provided in the questions paper, including the formula used. Writing down the complete steps will allow the examiner to study your approach and if you make a careless mistake in a sub- section, follow through marks may still be given for other sub-sections that are correctly done. Otherwise you may lose all marks in other sub-sections as well.SECTION B1. Section B consists of two questions. You need to answer only ONE question from this section.2. The marks allocated for this section is 20 marks.3. You are advised to spend 30 minutes on this section.4. The questions from section B are normally preceded by a diagram that shows a certain state or situation that is related to a specific Physics concept.5. You are normally asked to state the characteristics shown in the diagram and also to state the Physics principles involved.6. Study the marks allocated to each section or sub-section in the questions. The marks allocated in each section may be as high as 10 marks. In such cases, make sure that you have at least 10 points or properties related to the section as each point is normally allocated 1 mark.7. Equations, diagrams, tables, graphs or other suitable methods may be used to explain your answer. However, your answer should be clear and logical. Answering Technique for SPM Physics | 2010 4
  4. 4. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER]SECTION C1. Sections C consists of two questions. You need to answer ONE question only from this section.2. Questions in this section normally require the interpretation of the data provided. As such you will have to study the data carefully and understand what it is all about.3. The marks allocated for this section is 20 marks.4. You are advised to spend 30 minutes on this section.5. The questions from Section C are normally preceded by a table that is related to a specific Physics concept,6. Study the marks allocated to each section or sub-section in the questions. The marks allocated in each section may be as high as 10 marks. In such cases, make sure that you have at least 10 points or properties related to the section as each point is normally allocated 1 mark.7. The questions in this section normally require you to state a certain principle or to explain certain properties or characteristics based on the information given.8. Note that questions in Section B and C only involve the explanation of theories and do not contain questions that require you to describe an experiment.ANSWER STRATEGY PHYSICS QUESTIONS PAPER 3 – Written Practical Questions (1 Hours30 Minutes)1. In paper 3, you are asked to design an experiment and answer questions related to the experiment.2. This is to test the analytical skills and creative thinking skills and critical thinking (CCTS). To answer this question well you must be skilled ALL experiment was conducted at the school.3. Responding time: 1 hour 30 minutes.4. This paper is divided into two parts: Part A and Part B.SECTION A1. Section A consists of two structured questions. You need to answer all questions from this section.2. This section is allocated a total of 28 marks.3. The questions in this section are based on experiments that you should have already done in the laboratory.4. The questions in this section normally require you to plot a graph or graphs. As such make sure that you know all the steps involved in plotting a graph.5. You are advised to spend 60 minutes on this section.6. You are normally required state the manipulated variable, the responding variable and the constant variable based on the aim and the procedure of the experiment. Make sure you know the meaning of each of the variable stated above.7. The questions from this section also involve the interpretation of graphs. As such you will need to carefully determine the quantity represented by the slope of graph provided. You will also need to know how to determine the slope of a graph. Answering Technique for SPM Physics | 2010 5
  5. 5. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER]8. The questions from this section may also involve the calculation of certain quantities. Make sure that you write down all the steps involved in the spaces provided in the questions paper.SECTION B1. Section B consists of two questions. You need to answer ONE question only from this section.2. This section is allocated a total of 12 marks.3. You are advised to spend 30 minutes on this section.4. The questions in this section are normally preceded by a diagram depicting a situation in our daily lives together with a brief write-up on the situation shown.5. You will have to study the situation carefully as you are normally asked to state one suitable inference that can be made from the situation.6. You will also be asked to state one appropriate hypothesis for an investigation and to describe an experimental framework to test hypothesis. In your description, you will have to state clearly the following: (i) Aim of the experiment (ii) Variables involved in the experiment (iii) List of apparatus and materials (iv) Arrangement of the apparatus (v) The procedure of the experiment which includes - the methods of controlling the manipulated variable - the method of measuring the responding variable - the method of repeated experiment (vi) The way you would tabulate the data (vii) The way you would analyse the data 7. Make sure that you describe your experiment according to the format shown above. 8. Make sure you provide a fully labeled diagram of the apparatus used. 9. Write out your experiment in the passive voice and use short sentences. 10. When making a conclusion, make sure that your conclusion is in line with your hypothesis. Answering Technique for SPM Physics | 2010 6
  6. 6. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER]COMMAND WORDS YOU NEED TO KNOW TO ANSWER QUESTIONS CORRECTLY Command Words ExampleNameSimply requires thetechnical name for aprocess, a chemical etc. (a) Name the heat energy, Q1, which is absorbed from R to S. Latent heat // Specific latent heat (of fusion) [1 mark]State (a) State one reason why the temperature at R and S is the same evenState means you need though heat is supplied.to give only brief The heat needed to break the bonds between molecules // moleculesanswers. This means move further apart // to change solid to liquid // to change physicalthat, detail explanations form // kinetic energy doesn’t change.are not required. Only [1 mark]requires a simplestatement, no reasoningis expected.Calculate (a) Calculate the het energy, Q2, which is absorbed from S to T.Used when a numerical [The specific heat capacity of water, C=4200 J kg-10C-1]answer is required. In Q = mcθgeneral, working 1.0 x 4200 x 100should be shown, 420 000 J // 4.2 x 105 J // 420 kJespecially where two or [2 marks]more steps areinvolved. Answering Technique for SPM Physics | 2010 7
  7. 7. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER]Meant (b) What is meant by pressure?You need to remember Force Fonly certain sentences Force per unit area // Force ÷ Area // // , where; F is Area Aused which are to force, A is area.conclude all aspects [1 mark]which are required.Only a formal (a) What is meant by speed?statement or equivalentparaphrase is required. Distance/Time // rate of change of distance // s ; where, s = t distance, t = time [1 mark]Compare (c) Based in Diagrams 2, compare theYou need to state the water pressure at P and Q. Explaindifference or similarity your answer.about two things. Pressure at Q is higher // Pressure at P is lower // Q > P // Q is higher // Q is more // Q is bigger //Explain Q is more than PExplain means that thedetails explanations are Depth at Q is higher // Depth at Prequired to support a is lower // hQ > hP // HQ > HP > Qstatement given. is deeper // Pressure increases asImportant the depth increasespoints/information needto be given specifically.General ideas areinsufficientComplete (a) Complete the Table.Usually used wherethere are missing items Distance from the Characteristics of imagein a table, diagram or concave mirrorwords in a sentence 5 cm Virtual, upright and magnifiedparagraph. 8 cm Virtual, upright and magnified 15 cm Real, inverted and magnified 200 cm Real, inverted and same size as the object. 25 cm Real, inverted and diminished Answering Technique for SPM Physics | 2010 8
  8. 8. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER] (b) Complete the ray diagram to show the image which is formed by the concave mirror. Mark the image with a letter I. (c) Complete the diagram (b) to show pattern of the waves after they pass through the gap. Answering Technique for SPM Physics | 2010 9
  9. 9. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER]DetermineImplies that thequantity concernedcannot be measureddirectly but is obtainedby calculation,substituting measuredor known values orother quantities into astandard formula. (a) Based on the graph in diagram (b), (i) determine the focal length of the convex lens 1 f = 0.1 = 10 cm [2 marks] (ii) determine the power of the convex lens. 1 P = f 1 = 0.1 = 10 D [2 marks]SuggestCan be used in twomain contexts, i.e.either to imply thatthere is no uniqueanswer, or where thismay not be formally inthe syllabus, but theexaminer thinks thecandidate should be The result obtained is shown by the graph in diagram above.able to apply his (a) Suggest one way to determine the resistance of the bulb from the graph.knowledge to make a The gradient of the graphsimple deduction. [1 mark] Answering Technique for SPM Physics | 2010 10
  10. 10. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER]Describe (a) Describe how the current, I passing the heating element changes whenRequires the candidate the potential difference, V is increased from 0 to 240 V. Sketch a graphto state in words (using to support your description.diagrams where The current that flows through the heating element, increases as theappropriate) the main potential difference across it increases.points of the topic. It isoften used withreference either toparticular phenomenaor to particularexperiments. [2 marks] (b) Using these mirrors and other materials, describe how you would make the periscope. [4 marks] Answering Technique for SPM Physics | 2010 11
  11. 11. PHYSICS 2010 [TIPS FOR ANSWERING S TIPS SPM PAPER]TYPES OF QUESTIONS IN PAPER 2 SPM PHYSICS1. APPLICATION (Section A and C)2. CONCEPTUALISATION (Section A and B)3. PROBLEM SOLVING ( Section B)4. DECISION MAKING ( Section B and C)5. COMPREHNSION (Section B)SCORING EXAMPLE - Paper 2 Section A and C(APPLICATION)- ability to use information to explain phenomenon- ability to use information to calculate physical quantities1. Diagram 7.2 shows a hydraulic jack in a car service centre. A force of 50N is exerted on the small piston when the handle is pushed down. The cross cross-sectional areas f the small piston and the large piston are 0.04 m2 and 0.8 m2 respectively. (i) Calculate the pressure exerted on the oil in the hydraulic jack. P= 1 = Substitution = 1250 Nm-2 Answer with unit 1 [2 marks] Answering Technique for SPM Physics | 2010 12
  12. 12. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER] (ii) Calculate the force that the oil exerts on the large piston. Solution: = 1250 - 1 F = 1250 x 0.8 Answer with unit = 1000 N [1 mark]2. Explain why a piece of paper burns when placed under a convex lens aimed towards hot sun rays. Solution 1: 1 - Parallel light rays 2 - Converge or focus after pass through a lens 3 - Converge at principle focus 4 - Light energy is convert to heat energy Solution 2: [4 marks] Answering Technique for SPM Physics | 2010 13
  13. 13. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER]SCORING EXAMPLE - Paper 2 Section B(CONCEPTUALISATION) [5 MARKS]- This element is concern with the ability to make generalization based on the relationship between common characteristics and the relationship between variables in order to construct meaning to concept. Thus include the ability to identify common characteristics and variables in order to construct a specific physics concept.1. Diagram 9.1 and Diagram 9.2 show parallel rays are directed towards the lenses P and Q with focal point F. Diagram 9.1 Diagram 9.2 Using Diagram 9.1 and Diagram 9.2, compare the thickness, the focal length and power of the lens. Relate the thickness of the lens with the focal length to make a deduction regarding the relationship between thickness of the lens and the power of lens. Solution: 1 - Lens in diagram 9.1 is thinner 1 - Focal length in diagram 9.1 is longer 1 - Power of lens in diagram 9.1 is lower 1 - The thinner the lens the longer the focal length 1 - The thinner the lens the lower the power [5 marks] Answering Technique for SPM Physics | 2010 14
  14. 14. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER]2. Diagram 9.1 shows the effect of pressure on a sandy beach when a man sits on a chair. Diagram 9.2 shows the same man sitting on the same chair after a piece of plank is placed under the chair. (a) What is the meaning of pressure? Force per unit area / P = ; where F = force, A = area [1 mark] (b) Observe diagram 9.1 and diagram 9.2. Compare the depth of sinking, the load and the area of contact with the sandy beach. Relate the depth of sinking with the pressure exerted by the chair to make a deduction on the relationship between the pressure and the area of contact in this situation. Solution: 1 - Depth of sinking in 9.1 is deeper than in diagram 9.2 1 - The weight of the man in diagram 9.2 and 9.1 is equal 1 - Area contact in diagram 9.2 is larger than 9.1 1 - The depth of sinking increases, pressure increases / d α P / hαP 1 - As the area of contact increases, the pressure exerted # decreases / P α [5 marks] Answering Technique for SPM Physics | 2010 15
  15. 15. PHYSICS 2010 [TIPS FOR ANSWERING S TIPS SPM PAPER]SCORING EXAMPLE - Paper 2 Section B(PROBLEM SOLVING) [10 MARKS]This element is concerned with the ability to use information, scientific skills and thinking skills tosolve Physics problems qualitatively and quantitatively and to carry out a planned scientificinvestigation systematically.1. Diagram 9.3 shows a pole vaulter performing a jump. Using appropriate physics concepts, explain the use of suitable equipment and techniques to improve his performance. Your answer should include the following aspects: (i) Vaulter’s attire (ii) Vaulter’s movement (iii) Pole used (iv) Safety [10 marks] Aspect Reason 1 1 Tight and light attire / spiked shoes Less air friction / increases the speed 1 To increases kinetic energy / 1 Sprint / Increases speed momentum 1 Easily bend / easily carried / increase 1 More elstic / light / bends easily the potential elastic energy 1 1 Strong pole / Not easily broken 1 increases collision time / reduce 1 Use thicker mattress impulsive force Answering Technique for SPM Physics | 2010 16
  16. 16. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER]2. Diagram 9.6 shows a sailboat. Your are required to gives some suggestions to design a Vsailboat which can travel faster. Using the knowledge on motion, force and the properties of materials, explain the suggestions based on the following aspects: (i) the surface of the board (ii) the shape of the board (iii) material used for the board (iv) material used for the sail (v) the size of the sail [10 marks] Aspect Reason 1 Reduce (water) friction / resistance / 1 Smooth // coat with wax drag 1 Streamline shape / torpedo / Reduce water friction / drag / 1 aerodynamic / sharp end / diagram resistance Rej: oval Low density // strong material // tough // Easy to float // Not easy to break // Fiber glass // carbon composite 1 1 Slides faster // Increases the speed // Rej: Light // With stand // Small mass Hard/Rubber/Glass/Fiber/Composite To avoid the sail absorbed water // Water proof // Low density material // 1 becomes heavier // Not easy to tear off 1 Nylon // Tough // Strong // Canvas // // Small mass // Lighter // Can Synthetic withstand strong wind without damage 1 1 Wide // Big // Large Trap more wind // Bigger force3. You are given two convex lenses, P and Q, with focal lengths 40 cm and 5 cm respectively. Both the lenses are used to build a simple astronomical telescope at normal adjustment. (i) Using the two lenses, explain how you are going to build the simple astronomical telescope. (ii) Suggest modification that needs to be done on the telescope to produce clearer and bigger images. Answering Technique for SPM Physics | 2010 17
  17. 17. PHYSICS 2010 [TIPS FOR ANSWERING S TIPS SPM PAPER] [10 marks] Solution: 1 - Increases the diameter of the objective lens - More light enter the lens 1 - Increases the focal length 1 - Increase the magnification 1SCORING EXAMPLE - Paper 2 Section C(DECISION MAKING) [10 MARKS]1. Diagram 11.1 shows a light signal travelling through an optical fibre made of glass glass. (a) The optical fibre in Diagram 11.1 can be used in telecommunications and medicine. You are asked to investigate the characteristics of optical fibres for use in these fields as shown in Table 11. Answering Technique for SPM Physics | 2010 18
  18. 18. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER]Explain the suitability of each feature of optical fibre in Table 11 for use intelecommunications and medicine. Determine the most suitable optical fibre that iscapable of carrying the largest number of signals simultaneously.Give reasons for your choice. [10 marks] Answering Technique for SPM Physics | 2010 19
  19. 19. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER] Characteristics Explanation 1 1 Use a bundle of fine parallel optical fibre Can receive more information 1 1 Choose η > η Total internal reflection can occur 1 2 1 1 Must be high flexibility So that it can follow the curve path 1 Purity of inner core must be very high So that the signal can travel without losing information // information easy to send 1 R is choose 1 Because it use a bundle of fine parallel optical fibre, η > η , high flexibility and very 1 2 1 high purity of inner core2. (a) Your are asked to investigate the design and the characteristics of five filament lamps shown in diagram 12.2 Explain suitability of each characteristic of the lamps and determine the lamp which can produce the brightest light. Give reason for your choice. Answering Technique for SPM Physics | 2010 20
  20. 20. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER] [10 marks] Characteristics Explanation 1 1Coild High resistance / more heat 1 1Thin More resistance / more heat 1Tungsten High mealting point / High resistance / Not melt easily 1 1Low pressure The bulb will not burst / explode / brake 1 1R 1Coiled, thin wire, tungsten, nitrogen at low pressure Answering Technique for SPM Physics | 2010 21
  21. 21. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER](b) Diagram 12.3 shows an energy saving bulb. When it is connected to a 240 V power supply, the bulb produces 10 joules per second of light energy. Calculate (i) the current flows through the bulb (ii) the heat energy lost in 1 second from the bulb (iii) the efficiency of the bulb [5 marks] Solution: 1 (i) ŵŵ Correct substitution ŶŸŴ 1 0.046 A / 0.05 A Correct answer with unit 1 (ii) 1J Correct answer 1 (iii) #" Correct substitution x 100% ## 1 90.91 % / 90.909 % / 90.9090% Correct answer Answering Technique for SPM Physics | 2010 22
  22. 22. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER]SCORING EXAMPLE - Paper 2 Section B(COMPRENSHION)- This element is concerned with the ability to interpret, extrapolate, and understand concepts or principle in Physics.1. (a) Observe diagram 6.1 and diagram 6.2 (i) Compare the depths of the water in region X and region Y. X is deeper / bigger / higher / X > Y / Y < X [1 mark] (ii) Compare the wave lengths of the waves in region X and region Y. X is longer / X > Y / Y < X [1 mark] (iii) Relate the depth of water to the wave length of the waves. The deeper the water, the longer the wavelength / wavelength is directly proportional to the depth of the water / h α λ [1 mark] (iv) Name the wave phenomenon involved Refraction / Refract [1 mark] (v) Explain why the wave front of sea water will follow the shape of the shore when it approaches the shore. - The depth of the water decreasing / move in shallow area - The velocity is decreasing / wavelength is decreasing / λ decreasing - Refraction occurs / bending / change direction /diagram [3 marks] Answering Technique for SPM Physics | 2010 23
  23. 23. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER]2. On diagram 8.2 draw a ray diagram to show how the image form. [3 marks]3. You are given two pieces of plane mirror measuring 5 cm x 6 cm to make a periscope. (i) Using these mirrors and other materials, describe how you would make the periscope. [4 marks] Answering Technique for SPM Physics | 2010 24
  24. 24. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER] Answering Technique for SPM Physics | 2010 25
  25. 25. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER]SULIT 4531/3 Section A [28 marks] Answer all questions in this section1 A student carries out an experiment to investigate the relationship between the length of wire, l, and its resistance, R. The arrangement of the apparatus is shown in Diagram 1.1. An ammeter, dry cells, a rheostat, a switch and piece of constantan sire are connected in series. A voltmeter is used to measure the potential difference, V, across the constantan wire between P and Q. A constantan wire of length, l = 20.0 cm is connected between P and Q. When the switch is on, the rheostat is adjusted until the ammeter reading is 0.50 A. The voltmeter reading, V, is as shown in Diagram 1.2 on page 4. The corresponding voltmeter reading across P and Q are shown in Diagram 1.3, 1.4, 1.5 and 1.6 page 4. Answering Technique for SPM Physics | 2010 26
  26. 26. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER] Answering Technique for SPM Physics | 2010 27
  27. 27. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER]SULIT 4531/3 (a) For the experiment describe on pages 2 and 3, identify: (i) The manipulated variable Length of (wire) / l [1 mark] (ii) The responding variable Resistance / R // Potential difference / V // Voltmeter reading // Voltage *Rej: voltmeter [1 mark] (iii) The constant variable Diameter of wire // Type of wire // Current // Thickness // Cross-sections of wire // Radius // Ammeter reading // SWG // Resistivity // Temperature *Rej: Size, no of battery, emf, dge [1 mark] (b Based in Diagram 1.2, 1.3, 1.4, 1.5 and 1.6 on page 4: (i) Record the voltmeter readings, V, in the spaces provided on page 4. Diagram 1.2 : 0.4 V Diagram 1.3 : 0.9 V Diagram 1.4 : 1.3 V Diagram 1.5 : 1.7 V Diagram 1.6 : 2.2 V [2 marks] V (ii) Calculate the values of R for each length of wire using the formula R = 0.5 Diagram 1.2 : 0.8 Ω Diagram 1.3 : 1.8 Ω Diagram 1.4 : 2.6 Ω Diagram 1.5 : 3.4 Ω Diagram 1.6 : 4.4 Ω [2 marks] (iii) Tabulate your results for V and R for all values of l, in the space below. l / cm V/V R / ohm 20.0 0.4 0.8 40.0 0.9 1.8 60.0 1.3 2.6 80.0 1.7 3.4 100.0 2.2 4.4 Values of l, V and R shown in the table State the units of L, V and R correctly The values of l, V and R are consistent to one or two decimal place. [3 marks] Answering Technique for SPM Physics | 2010 28
  28. 28. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER](c) On the graph paper on page 6, plot a graph of R against l. - Show R on the vertical-axis and l on the horizontal-axis - State the units of the variable correctly / symbol of units - Both axes are marked with uniform (even) scale * (1:1, 1: 2, 1:4, 1:5, 1:10) * Rej: Odd scale - All five points are plotted correctly * ± 1 (2 mm x 2 mm) * 5 points – 2m / 3-4 points – 1m - Best fitted straight line * point to the line ≤ 5 mm @ 2.5 - Show the minimum size of graph at least 5 (y) x 4 (x) ( 2 cm x 2 cm) square * Start from the origin until the last point [5 marks](d) Based on your graph in 1(c), state the relationship between R and l. Resistance of wire / R is directly proportional to the length of wire / l / R α l, l α R / Increasing linearly [1 mark] Answering Technique for SPM Physics | 2010 29
  29. 29. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER] Answering Technique for SPM Physics | 2010 30
  30. 30. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER]2 A student carries out an experiment to investigate the relationship between the mass, m, of a load placed on a spring and the length, l, of the spring. The student also determines the spring constant, k. The result of this experiment is shown in the graph of l against m in Diagram 2.1 on page 9. Answering Technique for SPM Physics | 2010 31
  31. 31. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER](a) Based on the graph in Diagram 2.1 (i) what happens to l as m increases? Increases // longer // extended // greater length // bigger length // higher length [1 mark] (ii) determine the value of l when m = 0 g. Shown on the graph, how you determine the value of l. l = 9.5 – 10 cm - show graphical extrapolation correctly - state the value within acceptable range [2 marks](b) The spring constant, k, is given by the formula k = 1/h, where h is the gradient of the graph. (i) Calculate the gradient, h, of the graph. Show on the graph how you calculate h. h = (22.5 – 10)/60 = 0.208 cm g-1 - Draw a sufficiently large triangle ≥ 8 cm x 8 cm - Correct substitution - State the value within acceptable range and correct unit * Reject : answer in fraction [3 marks] (ii) Determine the value of k. k = 1/h = 4.81 g cm-1 - Correct substitution - State the value of k within the acceptable range [2 marks](c) Another identical spring is connected in series to the end of the spring. The spring 1 1 1 constant, k’, of the two springs in series is given by the formula = + . k k k Calculate k’. k’ = …………………………. - Correct substitution 1 1 1 = + . k 4.81 4.81 1 - State the value of k 1 1 = k 4.81 - State the value of k’ 2.41 g cm-1 / 2.405 g cm-1 [2 marks] Answering Technique for SPM Physics | 2010 32
  32. 32. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER](d) State two precautions that can be taken to improve the accuracy of the readings in this experiment. - Repeat readings and take average - Eye perpendicular to the scale/reading to avoid parallax error. - Ensure the spring does not swing / at rest when reading is taken. *Rej: parallax error, parallel [2 marks] Answering Technique for SPM Physics | 2010 33
  33. 33. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER] Section B [12 marks] Answer any one questions from this section1 Diagram 3 shows two opaque cups, A and B, containing different amount of water. A similar coin is placed at the bottom of each cup. When the coin is observed from the same position, the image of the coin in cup A cannot be seen, but the image of the coin in cup B can be seen. Diagram 3 Based on your observation on the depth of the water and the position of the images of the coins: (a) State one suitable inference - Depth of water affects the position of image - Position of image depends on the depth of water *Note: - Must have cause without effect - RV influenced by MV - RV affected MV - MV affects RV [1 mark] (b) State one hypothesis that could be investigated. - The more the depth of water, the more the depth of the image // the higher is the image. *Note: Must have cause and effect [1 mark] Answering Technique for SPM Physics | 2010 34
  34. 34. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER](c) With the use of apparatus such as a tall beaker, pins and other apparatus, describe an experiment to investigate the hypothesis stated in 3(b) In your description, state clearly the following; i. The aim of the experiment. To investigate the relationship between the depth of water and apparent depth // real depth and apparent depth *Note: Relate MV and RV ii. The variables in the experiment. Manipulated variable: Real depth Responding variable: Apparent depth // Depth of image * Note: Both must correct Constant variable: Density of water // Refractive index // Type of liquid iii. The list of apparatus and materials. Beaker, Water, Pins, Set of retort stand, Metre rule // Diagram iv. The arrangement of apparatus. - State a functional arrangement of the apparatus *Note: Functional mean experimental can be done or can get a data. v. The procedures of the experiment which include the method of controlling the manipulated variable and the method of measuring the responding variable. State the method to control manipulated variable Fill beaker with water to a depth of d1 = 10 cm / any number or symbol/letter State the method to measure the responding variable Move the pin outside the beaker to obtain the apparent position of the pin in the beaker. Measure the position of the pin from the surface of the water to the pin. Answering Technique for SPM Physics | 2010 35
  35. 35. PHYSICS 2010 [TIPS FOR ANSWERING SPM PAPER] Repeat the experiment at least 4 times Repeat the previous steps by increasing the depth of water 15 cm, 20 cm, 25 cm and 30 cm.vi. The way to tabulate the data. Show how the data is tabulated. *Note: Must have 2 columns Depth of water, d / cm Apparent depth, h / cm 10 15 20 25 30vii. The way to analyse the data. Plot a graph of apparent depth against the depth of water / real depth // Sketch of graph. Apparent depth/cm Depth of water/cm - If use symbol, must mention earlier. - Accept conclusion, statement of variable related. -hαd [10 marks] Answering Technique for SPM Physics | 2010 36

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