Your Essential Guide to Higher Education

Transcription

1 87 TIMES HIGHER EDUCATION SCIENCE Paper 2 Nov./Dis 1 hour 1. Answer all the questions DO NOT OPEN UNTILL INTSRUCTED TO 2. Think thoroughly before answering any of the questions. If you need to change your answer, erase the answer properly and thoroughly before remarking the question sheet. This question paper contains 10 printed pages and 0 non printed pages 1511/2 Your Essential Guide to Higher Education

2 88 Section A [ 20 marks ] Answer all question (You are advised to spend 60 minutes on this section.) 1. Figure 1 shows an experiment to study the melting point of substance X Thermometer Substance X Figure 1 The results of the experiment are recorded in Table 1 Time / minute Temperature / ºC Table 1 (a) Based on Table 1, draw a graph of temperature against time. [ 2 marks ] Temperature / ºC Time / minute (b) Based on the graph in (a), determine the melting point of substance X. Mark the melting point of substance X on the graph. [ 2 marks ] 1511/2 New edition of HIGHER EDUCATION out In January 2009

3 89 (c) What is the relationship between the temperature of substance X and time in the first 10 minutes. (d) State one responding variable in this experiment. 2. Figure 2 shows an experiment to compare the reactivity of metals P,Q and R with dilute acid. (a) Write down one observation for the above experiment P Q R Figure 2 Dilute sulphuric acid Gas bubbles.. [ 1 mark ] (b) Write down one inference that can be made from the above observation... [ 1 mark ] (c) State the manipulated variable in this experiment... [ 1 mark ] (d) Predict what are metals P and Q in Figure 2 using the following information Metal P Metal Q Metal R Iron nail Magnesium Aluminium [ 2 marks ] 3. Figure 3 shows an object P in front of a convex lens Object P F 2F 2F F Figure /2 Your Essential Guide to Higher Education

4 90 (a) Draw a ray diagram of the image formed by object P in Figure 3 [ 2 marks ] (b) Measure and write down the size of the image.. cm [ 1 mark ] (c) State one characteristic of the image formed in Figure 3... [ 1 mark ] (d) Name one optical instrument which uses the principle shown in Figure 3? [ 1 mark ] 4. Figure 4.1 shows the apparatus set up to study the hardness of copper and brass retort stand copper block Figure 4.1 weights brass block Figure 4.2(a) and Figure 4.2(b) shows the effect on the copper and brass when weights of the same mass are dropped on them copper brass Figure 4.2 (a) (a) State one fixed variable in this experiment? brass block Figure 4.2 (b) [ 1 mark ] (b) State one inference that can be made based on the observation [ 1 mark ] (c) (d) Based on Figure 4.2(a), measure and write down the depth of the dent made by the copper block.. cm [ 1 mark ] State the composition of brass. [ 1 mark ] (e) What is the operational definition of a copper block? [ 1 mark ] 1511/2 New edition of HIGHER EDUCATION out In January 2009

5 91 Section B [ 30 marks ] Answer all question (You are advised to spend 60 minutes on this section.) 5. Figure 5 shows a section of through the human brain. P R :... Q :... (a) Name Q and R in the space provided in Figure 5 [ 2 marks ] (b) State one function of the part labelled P (c) P has folded surfaces. What is the reason for having folded surfaces? (d) Tick ( ) the actions controlled by part R of the brain Figure 5 Sitting Breathing Sneezing Balancing Reading Table 5 Figure 6 shows chromosome sets in Child Q with a genetic disorder [ 1 mark ] Figure /2 Your Essential Guide to Higher Education

6 92 (a) What type of mutation is formed in Figure 6? (b) Name the disease that Child Q may be suffering from... (c) How many chromosomes did Child Q have?.. [ 1 mark ] (d) Which pair of chromosome can cause the child to suffer from the disease named in (b) (e) Give one characteristic feature of Child Q (f) Based on Figure 6, what would be the sex of Child Q? 7. Figure 7 shows the apparatus set-up to obtain pure ethanol from a solution Figure 7 (a) Name the method shown in Figure 7. [ 1 mark ] (b) Why is water let into the condenser from the lower tube?. [ 1 mark ] (c) Suggest one use for the pieces of porcelain?. [ 1 mark ] 1511/2 New edition of HIGHER EDUCATION out In January 2009

7 93 (d) The method of purification is a combination of two processes. What are they? [ 2 marks] (e) Based on Figure 7, name the distillate.... [ 1 mark ] 8. Figure 8 shows three radioactive rays, each with different penetration force. sheet of paper aluminium plate lead plate P :... Q :... R :... Figure 8 (a) On Figure 8, name the radioactive rays P,Q and R. [ 3 marks ] (b) Which ray does not deflect in an electric field? Radioisotopes in Table 8 are important for human beings Plutonium -238 Carbon-14 Phosphorus -32 Uranium -238 Sodium-24 Iodine-131 Table 8 (c) Based on Table 8, write down the radioisotopes used for agricultural purposes?... [2 marks ] 1511/2 Your Essential Guide to Higher Education

8 94 9. Figure 9 shows an apparatus set-up to study the reaction of different metals with oxygen. L : Metal P Metal Q K : Metal R (a) (b) On Figure 9, name K and L using the following information: Glass wool Potassium manganate(vii) Heat Metal powder [ 2 marks ] State the function of potassium manganate(vii) in this experiment. [ 1 mark ] Table 9 shows the observation of this experiment. (c) Metal P Q R Observation Burns with a bright flame Glows a little with a dim flame Glows with a red colour Table 9 Based on Table 9, state (i) the most reactive metal (ii) the least reactive metal Figure 7 [ 2 marks ] (d) Arrange the metals descendingly occording to their reactivity with oxygen. 1511/2 New edition of HIGHER EDUCATION out In January 2009

9 95 Section C [ 20 marks ] Answer Question 1 and any of Question 2 or Question Study the following statement : Different colour filters transmit different coloured lights when white light passes through them You are given red filter, blue filter, green filter and other apparatus. (a) Suggest a suitable hypothesis for this scientific investigation [ 1 mark ] (b) Using red filter, blue filter, green filter and other apparatus, describe an experiment based on the following criteria Aim of the experiment [ 1 mark ] The variables [ 2 marks ] List of apparatus and materials [ 1 mark ] Procedure [ 4 marks ] Tabulation of data [ 1 mark ] 11. (a) State four differences between physical change and chemical change. [ 4 marks ] (b) Figure 11 shows examples of several metals Aluminium Tin Metal Figure 11 Study the above figure. Explain how you would develop a concept based on the information in Figure 11 Your answer should be based on the following steps: Iron Copper Identify two common characteristics [ 2 marks ] Develop initial concept [ 1 mark ] Give another example and non-example in relation to the concept [ 2 marks ] Explain the actual concept [ 1 mark ] 1511/2 Your Essential Guide to Higher Education

10 (a) State three purposes of alloying and give one example of alloy. [ 4 marks ] (b) Sungai Pasir Industrial Park has become heavily polluted with toxic gases released by factories. After several years, acid rain takes place at the industrial park.you, as an environmental officer, have been asked to explain to the factory managers how to overcome this problem. Your answer should include the following: Identify the problem [ 1 mark ] Clarification of the problem [ 1 mark ] Solving methods [ 3 marks ] Choose the best method and explain your choice [ 1 mark ] 13. Figure 13 shows the endocrine system of a woman R Adrenal glands Pancreas S Figure 7 i) Name gland R... [ 1 mark ] (ii) What will happen to the woman if gland R secretes less hormone? [ 1 mark ] (c) (i) Name gland S.. [ 1 mark ] (ii) State one function of the hormone secreted by gland S Figure [ 1 mark ] Pancreas Hormone X Normal sugar level (d) (i) Based on Figure 13.1, state the function of hormone X... [ 1 mark ] (ii) How is hormone X secreted into the body?. [ 1 mark ] 1511/2 New edition of HIGHER EDUCATION out In January 2009