IGCSE Physics Longer Answer Practice - June Paper 1, 2015
Practice and understand IGCSE Physics longer answer questions on topics like Electricity, Pressure, and Radiation from the June 2015 Paper 1. Identify hazards in a kitchen, explain pressure in a hot air balloon, and discuss changes in temperature on molecules. Improve your exam skills with detailed explanations and marking points.
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This set of questions is iGCSE Specifics to enable you to practice and understand some of the marking points for longer answer style questions. Longer Answer Paper 1 2015 1. Try each question in turn. 2. Write out a full answer yourself (use the cover and hide method with a bit of paper) 3. Clearly show which MP you get by writing it on the answer and circle it. 1 Forces and Motion 2 Electricity 3 Waves 4 Energy 5 Solid Liquids Gases 6 Magnetism 7 Radioactivity 8 Astrophysics Animated Science 2022
Index of Questions Notes / Comment / Improvement Points / Paper Marks June Paper 1 2015 Q4 Mains /4 June Paper 1 2015 Q8 Pressure in Gases /4 June Paper 1 2015 Q9 Surface Radiation /4 June Paper 1 2015 Q13 Speed of Sound /5 Total /17 Animated Science 2022
June P1 2015 4 Mains Electricity 4 marks Answers Max of three electrical hazards identified A kitchen has a water supply, an electricity supply and electric lighting. Max of three amplifying details relevant to the hazard(s) identified, two maybe for one idea. There are several electrical appliances in the kitchen including a toaster, a kettle, a clothes iron, a microwave oven and a dishwasher. MP1. Idea of water in contact with something electrical e.g. plugs/sockets/switches; Idea that water conducts electricity; MP2. Idea that an electrical device with a heating element reaches a high temperature; Idea that this can cause shock; (risk of ) burns; / idea that insulation can melt and cause a fire; Discuss three hazards of using electricity in this kitchen. MP3. Idea that damaged equipment poses a hazard; e.g. microwave oven / Idea that this can cause shock; leaky microwave radiation can cause cancer; MP4. Idea overloaded cables or sockets; circuits should have correct fuses; can cause a fire; don t use multiway socket extensions; MP5. Idea of trip hazard from trailing cables; Do not use extension cables; Provide sufficient sockets; Use short mains leads; Animated Science 2022
June P1 2015 Q8 Pressure 4 Marks Answers A hot air balloon is filled with air through an opening. MP1. Idea of (continuous) random motion; The air is heated using a burner. MP2. collide /impacts / eq; bombard, hit, impact upon (a) Describe the effect of an increase in temperature on the average speed of the air molecules. (1) MP3. With walls (of balloon); MP4. idea that force is produced (by bombarding molecules); momentum argument / Newtons 3rd law i.e. force of the particle on the wall is opposite to force of wall on particle (b) The hot air causes a pressure on the inside of the balloon. Use ideas about molecules to explain how the hot air causes this pressure. (3) MP5. idea as pressure as force on an area or use of formula p = F/A Animated Science 2022
June P1 2015 Q9 Surface Radiation 4 marks A student has two computer hard drives. One is black and one is white. The student places the white hard drive on top of the black one as shown in photograph A. Answers MP1.either transfer between the two is by conduction; ignore other comments about conduction, convection , absorption and reflection The student connects both hard drives to a computer so that they receive the same amount of electrical power. The temperature of the hard drives rises as they work. The student then rearranges the hard drives so that the black one is on top as shownin photograph B. Explain why the hard drives work at a lower temperature when the black one is on top. MP2.Infrared (radiation) mentioned; MP3.Idea of emission of thermal energy; for thermal energy accept heat or radiation MP4.a correct effect of (surface) colour on emission; black emits heat / black is a good emitter MP5.Comparative of surfaces; the black loses more heat than the white MP6. correct statement about thermal energy flow at equilibrium temperature; B A Animated Science 2022
June P1 2015 Q13 Speed of Sound Answers (b) Two students investigate the speed of sound waves in air. MP1. A method to make a loud enough sound; with ideas of wooden blocks noise has to be heard over 100m ignore measurement of distance clap They use a stopwatch that shows times to the nearest 0.1 s. MP2. Speed = distance / time; MP3. Need for still air (or calm weather) They use an outdoor running track as their measure of distance. MP4. Repeat AND average; (allow repeat AND sort out anomalies) The track is straight and 100 m long. MP5. Need to check/ reset stopwatch zero reading; MP6. Idea of clear visual signal; e.g. when the sound is seen to be made/ smoke seen from starting pistol. Describe what else they must do to obtain a value for the speed of sound? MP7. measurement of time interval (between visual signal and sound); (light travels faster than sound) MP8. Idea of reaction time(s) (could be a problem); Animated Science 2022
