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NSW HSC 2008 : SENIOR SCIENCE

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2008 H I G H E R S C H O O L C E R T I F I C AT E E X A M I N AT I O N Senior Science Total marks 100 S ection I General Instructions Reading time 5 minutes Working time 3 hours Write using black or blue pen Draw diagrams using pencil Board-approved calculators may be used Write your Centre Number and Student Number at the top of pages 9, 13, 15 and 17 Pages 2 20 75 marks This section has two parts, Part A and Part B Part A 15 marks Attempt Questions 1 15 Allow about 30 minutes for this part Part B 60 marks Attempt Questions 16 26 Allow about 1 hour and 45 minutes for this part S ection II Pages 22 28 25 marks Attempt ONE question from Questions 27 31 Allow about 45 minutes for this section 233 Section I 75 marks Part A 15 marks Attempt Questions 1 15 Allow about 30 minutes for this part Use the multiple-choice answer sheet for Questions 1 15. 1 The diagram shows a modulated electromagnetic wave used in a communication system. Which communication system uses this type of electromagnetic wave? (A) AM radio (B) FM radio (C) Compact disc players (D) Fibre optics 2 Which energy transformation sequence best represents what happens when one person on a mobile phone is talking to another on a mobile phone? (A) Sound Electrical Infrared Electrical Sound (B) Sound Electrical Microwave Electrical Sound (C) Electrical Sound Infrared Sound Electrical (D) Electrical Sound Microwave Sound Electrical 3 What are the properties of AM radio waves that make them useful for communication? (A) Ability to be reflected, speed, security (B) Speed, security, ability to travel in a straight line (C) Ability to be reflected, speed, ability to travel in a straight line (D) Ability to be reflected, security, ability to travel in a straight line 2 4 A geostationary satellite orbits the Earth 36 000 km above the equator. It sends television signals to a satellite dish located in NSW. Which of the following correctly shows the features of this geostationary satellite? Period of revolution (hrs) Dish position (A) 24 North Fixed (B) 12 North Changes during the year (C) 24 South Fixed (D) 5 Direction of the satellite from Dish 12 South Changes during the year Digital technologies use zeros and ones for the coding and decoding of information. A four digit binary code can be used to represent numbers. This process is shown in the following examples. 0101 = 0 + 4 + 0 + 1 = 5 1010 = 8 + 0 + 2 + 0 = 10 1111 = 8 + 4 + 2 + 1 = 15 What number is represented by the four digit code 1011? (A) 3 (B) 6 (C) 11 (D) 13 6 During normal breathing, what makes exhalation occur? (A) The chest cavity expands. (B) The diaphragm relaxes and moves upwards. (C) The rib muscles contract and the rib cage expands. (D) The air pressure in the lungs is lower than external air pressure. 3 7 Which biomaterial is most suitable for use in an artificial toe joint? (A) Titanium alloy (B) Teflon (C) Stainless steel (D) Silicone 8 Where in the body would you find a pivot joint? (A) Hip (B) Knee (C) Neck (D) Shoulder 9 Which of the following health problems can be reduced by angioplasty? (A) Hole in the heart (B) Leaky valves within the heart (C) Irregular electric impulses to the heart (D) Plaque deposits that have built up inside arteries 4 10 This diagram shows a drop of water on a glass surface. water drop glass surface Which two factors are mainly responsible for the shape of the water drop? (A) Air pressure and gravity (B) Gravity and surface tension (C) Water pressure and air pressure (D) Surface tension and water pressure 11 This diagram shows a drop of detergent being added to a drop of water. dropper detergent water drop glass surface Which diagram best represents what happens to the water drop when a drop of detergent is added to it? (A) (B) (C) (D) 5 12 Which of the following is one role of the skin? (A) To help maintain a constant body temperature (B) To keep beneficial micro-organisms inside the body (C) To protect body organs from damaging UV radiation (D) To help maintain the volume of water inside the body 13 Why are valves important structures in the circulatory system? (A) They ensure one-way blood flow. (B) They prevent blood vessels from collapsing. (C) They allow blood pressure to be maintained. (D) They prevent leakage of blood from damaged blood vessels. 14 What characteristic of water allows it to be a common ingredient in cosmetics and external medications? (A) Water acts as a solvent. (B) Water acts as a surfactant. (C) Water acts as a colloidal agent. (D) Water acts as an emulsifying agent. 6 15 During an investigation of mixtures, students drew the following diagrams of their observations. Test 1 Uniform mixture (no layers) Oil Vinegar Immediately after adding ingredients Immediately after stirring Oil Vinegar After 24 hours Test 2 Mustard Oil Vinegar Immediately after adding ingredients Uniform mixture (no layers) Immediately after stirring After 24 hours What is a valid conclusion based on these observations? (A) In Test 2, the ingredients have reacted with each other to form a new substance. (B) In Test 1, stirring the ingredients has allowed them to become a solution. (C) In Test 2, the mustard appears to have acted as an emulsifier. (D) In Test 2, the mustard has dissolved the oil and vinegar. 7 BLANK PAGE 8 Board of Studies NSW 2008 2 008 HIGHER SCHOOL CERTIFIC ATE EXAMINATION Senior Science Centre Number Section I (continued) Part B 60 marks Attempt Questions 16 26 Allow about 1 hour and 45 minutes for this part Student Number Answer the questions in the spaces provided. Marks Question 16 (6 marks) (a) Nail polish has to be shaken in its container before it is painted onto nails. Explain why nail polish needs to be shaken. 2 ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... (b) Nail polish remover is a type of solvent. (i) Explain how nail polish remover takes nail polish off the nails. 2 ................................................................................................................... ................................................................................................................... ................................................................................................................... (ii) Explain one precaution that may be needed when using and handling solvents. ................................................................................................................... ................................................................................................................... ................................................................................................................... 234 9 2 Marks Question 17 (8 marks) A student investigated the effect of pH on the solubility of a range of medications. Each medication was placed in 200 mL of liquid. The student s results are shown. Time to dissolve (minutes) Medication Type pH 3 pH 7 pH 9 A Tablet 10 25 30 B Capsule 10 not soluble not soluble C Enteric coated capsule not soluble not soluble 5 (a) How would the student measure the pH of the liquid? 1 ............................................................................................................................... ............................................................................................................................... (b) What is the dependent variable in this investigation? ............................................................................................................................... ............................................................................................................................... Question 17 continues on page 11 10 1 Marks Question 17 (continued) (c) Explain one way the student could improve the reliability of their results. 2 ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... (d) From these results, the student concluded that medication C would be absorbed into the bloodstream from the digestive system faster than medication A or B. Assess this conclusion. ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... End of Question 17 11 4 Marks Question 18 (3 marks) (a) Label the stomach on this diagram. 1 (b) Outline TWO roles of the stomach in the breakdown of food. 2 ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... Question 19 (3 marks) Describe the advantages of using a sub-dermal implant to administer a drug. ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... 12 Board of Studies NSW 2008 3 2 008 HIGHER SCHOOL CERTIFIC ATE EXAMINATION Senior Science Centre Number Section I Part B (continued) Student Number Marks Question 20 (4 marks) This is a diagram of a human heart. 1 3 2 4 A B (a) On the diagram draw the letter X inside the left atrium. 1 (b) Which numbers on this diagram represent blood vessels that carry deoxygenated blood? 1 ............................................................................................................................... (c) Explain the difference in thickness of the walls at point A and point B. ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... 235 13 2 Marks Question 21 (3 marks) The diagram represents a machine that is used in hospital operating theatres. Machine Blood out Blood in pump oxygenator and filter Explain the role of this machine in sustaining life during heart transplants. ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... 14 Board of Studies NSW 2008 3 2 008 HIGHER SCHOOL CERTIFIC ATE EXAMINATION Senior Science Centre Number Section I Part B (continued) Student Number Marks Question 22 (6 marks) Identify ONE non-invasive and ONE minimally invasive medical technique. For each of the techniques identified, outline an advantage and a disadvantage. Minimally invasive technique Non-invasive technique Example Advantage Disadvantage 236 15 6 Marks Question 23 (6 marks) Discuss the use of visible light in communication systems. ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... 16 Board of Studies NSW 2008 6 2 008 HIGHER SCHOOL CERTIFIC ATE EXAMINATION Senior Science Centre Number Section I Part B (continued) Student Number Marks Question 24 (4 marks) (a) Complete the following table to compare the features of these information systems. Communication system Type of energy used Television Radio waves Land connected telephones Medium of transmission Copper cables (b) Outline TWO advantages of using a range of information systems. ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... 236a 2 17 2 Marks Question 25 (10 marks) (a) A student conducted an investigation of AM and FM radio waves. As part of their investigation, the student gathered and processed information about AM and FM radio waves from secondary sources. (i) Identify TWO resources that could be used to gather information from secondary sources. 1 ................................................................................................................... ................................................................................................................... (ii) Outline TWO reasons for using information from more than one source. ................................................................................................................... ................................................................................................................... ................................................................................................................... ................................................................................................................... A copy of the student s first-hand investigation is shown. Aim: To compare the quality of AM and FM reception near overhead power lines. Method: 1. A radio was tuned to an AM station away from overhead power lines. 2. The radio was placed underneath overhead power lines. 3. The station was listened to for 20 seconds and the reception rated on a scale of 1 to 10. 4. Repeat steps 1 3 for an FM station. Results: Type of Station News Music Band AM FM Quality of reception ( /10) 6 8 Conclusion: FM reception is better quality than AM reception near overhead power lines. Question 25 continues on page 19 18 2 Marks Question 25 (continued) (b) Graph the student s results from the table. 3 (c) 4 When the student s teacher marked the investigation, the teacher wrote This conclusion is not scientifically valid. The variables in this experiment have not been controlled . Evaluate the importance of controlling variables in this investigation. ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... ............................................................................................................................... End of Question 25 19 Marks Question 26 (7 marks) Interruptions to rhythmic contractions and faulty valves are two health problems associated with the heart. Analyse the biomaterials used in the devices designed to solve these health problems. ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... 20 Board of Studies NSW 2008 7 2 008 HIGHER SCHOOL CERTIFIC ATE EXAMINATION Senior Science Section II 25 marks Attempt ONE question from Questions 27 31 Allow about 45 minutes for this section Answer the question in a writing booklet. Extra writing booklets are available. Pages Question 27 Question 28 Preservatives and Additives ........................................................ 23 Question 29 Pharmaceuticals .......................................................................... 24 Question 30 Disasters ............................................................................... 25 26 Question 31 237 Polymers ..................................................................................... 22 Space Science ....................................................................... 27 28 21 Marks Question 27 Polymers (25 marks) (a) Copy the table into your writing booklet and complete. Polymer Natural or Synthetic 4 One ingredient Slime Playdough (b) (i) Identify ONE example of a thermoplastic and ONE example of a thermoset plastic. 2 (ii) Outline TWO observations you made from the investigation where you identified the effect of heat on different plastics. 2 (iii) What type of plastic would be most suitable for a kitchen benchtop? Justify your answer. 3 (c) Discuss the future of the production of polymers from petrochemicals. (d) A sail boat uses many different synthetic polymers. Some uses are identified in the diagram. 6 sail (spectra fibres) rope (nylon) clothing (PVC) Relate the properties of TWO synthetic polymers to their use on boats. (e) 4 Assess the viability of recycling different types of plastics. 4 End of Question 27 22 Marks Question 28 Preservatives and Additives (25 marks) (c) 2 2 (i) Outline the method and results of a first-hand investigation to model osmosis. 4 (ii) Identify a preservation technique that uses the process of osmosis and explain how this process helps preserve food. (b) (i) Name TWO microbes that cause food spoilage. (ii) Identify ONE symptom of and ONE treatment for food poisoning. (a) 3 Not all food additives are designed to preserve food. 6 Using examples, describe other uses of food additives. (d) Outline TWO methods that use high temperatures to prevent food spoilage. 2 (e) Explain how a chemical additive preserves food. 2 (f) Explain TWO ways that food additives have had a negative impact on human health. 4 End of Question 28 23 Marks Question 29 Pharmaceuticals (25 marks) The diagram shows a smear of human blood as viewed using a microscope. Awaiting copyright (a) (d) 2 Outline two roles of Y. 2 (i) Draw a flow chart to represent the nervous system pathway from the detection of a stimulus through to the response to the stimulus. 3 (ii) (c) What are Y and Z ? (ii) (b) (i) Outline the method and results of a first-hand investigation to demonstrate differences in people s reaction time to stimulus. 4 Discuss the use of aspirin to treat inflammation in the human body. 6 (i) Explain the action of penicillin on bacteria. 2 (ii) Penicillin is transported around the human body by the circulatory system. 2 What are the advantages of using the circulatory system for this purpose? (iii) Outline the events that led to the accidental identification of penicillin. End of Question 29 24 4 Marks Question 30 Disasters (25 marks) (a) Copy the table into your writing booklet and complete. Identify Australian examples other than bushfire. Disaster associated with nature and human activity 4 Disaster associated with human activity only Australian example Consequence (c) (i) Outline the method and results of a first-hand investigation to test the effect of differences in air pressure. 4 (ii) (b) Explain how this investigation models atmospheric pressure and the formation of winds. 3 Analyse the link between human activities and the severity of bushfires. Question 30 continues on page 26 25 6 Marks Question 30 (continued) (i) Draw a labelled diagram of the alarm or safety device that you constructed as part of your course. 2 (ii) (d) The floor plan shows the possible locations of TWO smoke detectors in a restaurant. 2 Which location is the most appropriate location for a smoke detector? Justify your answer. Gas stove Kitchen Location 1 Dining area Location 2 Main entrance (e) In 1974, Cyclone Tracy, a Category 4 cyclone, resulted in 65 deaths but in 2006 Cyclone Larry, a Category 5 cyclone, did not result in any deaths. Account for the differences in the loss of life resulting from the 1974 cyclone and the 2006 cyclone. End of Question 30 26 4 Marks Question 31 Space Science (25 marks) (a) Why is the the gravitational pull of the Earth different to that of the moon? 2 (ii) (b) (i) Identify TWO situations where a person could experience weightlessness. 2 The Saturn V was a multistage liquid-fuel expendable rocket used by NASA s Apollo missions to the moon between 1967 and 1973. The Saturn V rocket consisted of three stages and a spacecraft. The spacecraft contained the Command Module in which the astronauts returned to Earth. Awaiting copyright (i) Compare the functions of the components of the Saturn V rocket with those of the Space Transportation System (the shuttle). 4 (ii) Outline how the design of the Space Transportation System (shuttle) has reduced the dangers faced by astronauts during lift-off, in orbit and on re-entry. 3 Question 31 continues on page 28 27 Marks Question 31 (continued) (c) Describe the short-term and long-term effects on human body functions when living in the International Space Station. 6 (d) Compare the original use of TWO materials developed for space programs with their current use in society. 4 (e) Assess the value of projects designed to identify life and advanced civilisations in the universe. 4 End of paper 28 Board of Studies NSW 2008

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Additional Info : New South Wales Higher School Certificate Senior Science 2008
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