TECHNIQUE OF ANSWERING SPMPHYSICS PAPER 2 [4321/2]
ANSWER STRATEGY PHYSICS QUESTIONS PAPER 2 Subjective Questions (2 Hours 30 Minutes)SECTION A Section A of paper 2 consists of 8 questions. You will have to answer all the 8 questions in this section. The total in Section A is 60 marks 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. 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.
Write down all the steps in the spaces provided in the questions paper, including the formula used. A section that is allocated only 1 mark will require a short answer. 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. Answer all the 8 questions within the 90 minutes allocated. 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
SECTION B Section B consists of two questions. You need to answer only ONE question from this section. The marks allocated for this section is 20 marks. You are advised to spend 30 minutes on this section. 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. You are normally asked to state the characteristics shown in the diagram and also to state the Physics principles involved.
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.
SECTION C Sections C consists of two questions. You need to answer ONE question only from this section. The marks allocated for this section is 20 marks. You are advised to spend 30 minutes on this section. The questions from Section C are normally preceded by a table that is related to a specific Physics concept,
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. 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.
TYPES OF QUESTIONS IN PAPER 2 SPM PHYSICS Question No.1 - No.4(Knowledge, Understanding and Application)Questions No.5, No.6 and No.9/No.10 (Conceptualizing)Questions No. 7 and No.9/No.10 (Problem Solving)Questions No. 8 and No.11/No.12 (Making Decision)
Question No.1 - No.4(Knowledge, Understanding and Application) Understand the tasks Refer to the marks stated- 1 point for 1 mark Answer in simple words but meaningful related to physics concept Use correct terminology
Calculation: - Choose & write the relevant formula - Substitute the values correctly - Answer with correct unit Understanding and qualitative application - explain step by step [imaging the marker does not know the physics]
Example 1 Q21. Diagram 2 shows a water tank that supplies water to a block of flats. The water flows to each unit of the flat due to water pressure.
(a)What is meant by pressure?Force per unit area // Force Area // F/A, where; F is force, A is area [1 mark](b)A water tank with a height of 3.0 m is fully filled with water. Calculate the pressure at the base of the water tank.[Density of water = 1000 kg m-3]P = hg = 1000 x 9.8 x 3 = 29400 N m-2 // 2.94 x 104 N m-2 / Pa / kgms-2m-2 / kgm-1s-2[2 marks]
(c) Based in Diagrams 2, compare the water pressure at P and Q. Explain your answer.Pressure at Q is higher // Pressure at P is lower // Q > P // Q is higher // Q is more // Q is bigger // Q is more than PDepth at Q is higher // Depth at P is lower // hQ > hP // HQ > HP / Q is deeper // Pressure increases as the depth increases [2 marks]
Example 2 Q3A SPM 2007
(a) Name the heat energy, Q1, which is absorbed from R to S. Latent heat // Specific latent heat (of fusion) [1 mark] State one reason why the temperature at R and S is the same even though heat is supplied.The heat needed to break the bonds between molecules // molecules move further apart // to change solid to liquid // to change physical form // kinetic energy doesnt change [1 mark]
(c) Calculate the het energy, Q2, which is absorbed from S to T.[The specific heat capacity of water, C=4200 J kg-10C-1]
Q = mc = 1.0 x 4200 x 100 = 420 000 J // 4.2 x 105 J // 420 kJ[2 marks]
Questions No.5, No.6 and No.9 or No.10 (Conceptualizing) Every items starting with stimulus (situation). Stimulus or situation can be in diagram, table, chart or graph. Understand the tasks: - Comparison :State the similarities and differences (if there is any) - Differences: State characteristics that are different - Similarities : State the same characteristics Relationship: directly proportional/ inversely proportional/ When . increases, Increases/decreased. Name the law/principle/concept involved.
Example 1 Q5A SPM 20061. Diagram 5.1 shows the situation of a sheet of paper before and when air is blown.
Diagram 5.2 shows the situation of the canopy before the lorry moves and when the lorry moves at high speed.
What is meant by speed?The rate of change of distance with time / v=s/t ; s = distance, t = time[1 mark](b) Based in diagram 5.1 and diagram 5.2: (i) State two similarities for the situation in Diagram 5.1 and Diagram 5.2.- No air movement, the paper and the canopy will not lift up/at rest/not moves- Paper and canopy lift up when the air moves.[2 marks](ii) Compare the air pressure above and below the paper when air is blown.- Air pressure above the paper is lower/air pressure below is higher[1 mark]
(iv) Name the principle involved in 5(b)(iii). Bernoullis[1 mark](iii) Relate the speed of the air to the pressure of the air. High speed, low pressure / inversely proportional [1 mark]
Example 1- Q6 SPM 2009
(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 wavelengths 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 [1 mark](iv) Name the wave phenomenon involvedRefraction / Refract [1 mark]
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 / decreasing- Refraction occurs / bending / change direction /diagram
By using a diagram
Example 2 Q1B SPM 2011
Diagram 9.1Diagram 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.-Lens in diagram 9.1 is thinner-Focal length in diagram 9.1 is longer-Power of lens in diagram 9.1 is lower-The thinner the lens the longer the focal length-The thinner the lens the lower the power [5 marks]
Example 3 Q1B SPM 20092. 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 = F/A ; 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.
-Depth of sinking in 9.1 is deeper than in diagram 9.2-The weight of the man in diagram 9.2 and 9.1 is equal-Area contact in diagram 9.2 is larger than 9.1-The depth of sinking Iincreases, pressure increases / d P / h P -As the area of contact increases, the pressure exerted decreases /P 1/A
Questions No. 7 and No.9 or No.10 (Problem Solving)Structured Question1. Very sure of the concept / understand the working principle of apparatus and its function.2. Understand the questions / follow the instructions given.3. State the methods and reasons / explanations.
Essay type question: 1. Open type question
1. Understand the problem given2. State the method/suggestion/design/modification to solve the problems3. State the explanation for the each method /suggestion/ design4. Answer in table form for suggested modifications. e.gModificationsExplanation
2. Guided type Question (usually working principle of apparatus)1. Follow the instruction in the question.2. Answer can be in the form of diagram or essay.3. State the method/ways and reasons.Common mistakes:1. Suggestion of problem solving does not based on relevant physical concept2. Give wrong/irrelevant explanation/reason3. Give redundant/overlap suggestion/method
Example 5: Q9B SPM 2008 Diagram 9.3 shows a pole vaulter performing a jump.