AQA-PH1HP-QP-JUN12 - Centre Number For Examiners Use Candidate Number Surname Other Names Examiners Initials Candidate Signature Question General

AQA-PH1HP-QP-JUN12 - Centre Number For Examiners Use...

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General Certificate of Secondary Education Higher Tier June 2012 Science A PH1HP Unit Physics P1 Physics Unit Physics P1 Wednesday 20 June 2012 9.00 am to 10.00 am For this paper you must have: a ruler the Physics Equations Sheet (enclosed). You may use a calculator. Time allowed 1 hour Instructions Use black ink or black ball-point pen. Fill in the boxes at the top of this page. Answer all questions. You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. Do all rough work in this book. Cross through any work you do not want to be marked. Information The marks for questions are shown in brackets. The maximum mark for this paper is 60. You are expected to use a calculator where appropriate. You are reminded of the need for good English and clear presentation in your answers. Question 3(b) should be answered in continuous prose. In this question you will be marked on your ability to: – use good English – organise information clearly – use specialist vocabulary where appropriate. Advice In all calculations, show clearly how you work out your answer. PH1HP H (JUn12PH1Hp01) G/K83986 6/6/6/6 Centre Number Candidate Number Surname Other Names Candidate Signature For Examiner’s Use Examiner’s Initials Question Mark 1 2 3 4 5 6 7 8 TOTAL
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2 Do not write outside the box (02) G/K83986/Jun12/PH1HP Answer all questions in the spaces provided. 1 A wood burning stove is used to heat a room. The fire in the stove uses wood as a fuel. The fire heats the matt black metal case of the stove. 1 (a) The air next to the stove is warmed by infrared radiation. How does the design of the stove help to improve the rate of energy transfer by infrared radiation? ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ (2 marks)
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3 Do not write outside the box (03) G/K83986/Jun12/PH1HP Turn over 1 (b) Burning 1 kg of wood transfers 15 MJ of energy to the stove. The stove then transfers 13.5 MJ of energy to the room. Calculate the efficiency of the stove. Use the correct equation from the Physics Equations Sheet. Show clearly how you work out your answer. ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ Efficiency = ........................................ (2 marks) 1 (c) Some of the energy from the burning wood is wasted as the hot gases leave the chimney and warm the air outside the house. Name one other way energy is wasted by the stove. ............................................................................................................................................ (1 mark) 1 (d) Some people heat their homes using electric heaters. Other people heat their homes using a wood burning stove. Give two environmental advantages of using a wood burning stove to heat a home rather than heaters that use electricity generated from fossil fuels. 1 ......................................................................................................................................... ............................................................................................................................................ 2 ......................................................................................................................................... ............................................................................................................................................ (2 marks) Question 1 continues on the next page
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4 Do not write outside the box (04) G/K83986/Jun12/PH1HP 1 (e) The metal case of the stove gets hot when the fire is lit. Here is some information about the stove. Mass of metal case Starting temperature of metal case Final temperature of metal case Specific heat capacity of metal case 100 kg 20 °C 70 °C 510 J/kg °C Calculate the energy required to raise the temperature of the metal case to 70 °C. Use the correct equation from the Physics Equations Sheet.
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