Version : :4 4/06/08 abc General Certificate of Secondary Education Additional Science 4463 / Physics 445 PHYF Unit Physics Mark Scheme 008 examination June series
Mark schemes are prepared by the Principal Examiner and considered, together with the relevant questions, by a panel of subject teachers. This mark scheme includes any amendments made at the standardisation meeting attended by all examiners and is the scheme which was used by them in this examination. The standardisation meeting ensures that the mark scheme covers the candidates responses to questions and that every examiner understands and applies it in the same crect way. As preparation f the standardisation meeting each examiner analyses a number of candidates scripts: alternative answers not already covered by the mark scheme are discussed at the meeting and legislated f. If, after this meeting, examiners encounter unusual answers which have not been discussed at the meeting they are required to refer these to the Principal Examiner. It must be stressed that a mark scheme is a wking document, in many cases further developed and expanded on the basis of candidates reactions to a particular paper. Assumptions about future mark schemes on the basis of one year s document should be avoided; whilst the guiding principles of assessment remain constant, details will change, depending on the content of a particular examination paper. Further copies of this Mark Scheme are available to download from the AQA Website: www.aqa.g.uk Copyright 008. AQA and its licenss. All rights reserved. COPYRIGHT AQA retains the copyright on all its publications. However, registered centres f AQA are permitted to copy material from this booklet f their own internal use, with the following imptant exception: AQA cannot give permission to centres to photocopy any material that is acknowledged to a third party even f internal use within the centre. Set and published by the Assessment and Qualifications Alliance. The Assessment and Qualifications Alliance (AQA) is a company limited by guarantee registered in England and Wales (company number 364473) and a registered charity (registered charity number 073334). Registered address: AQA, Devas Street, Manchester M5 6EX Dr Michael Cresswell Direct General
Physics PHYF - AQA GCSE Mark Scheme 008 June Series PHYF Question (a) 53 (m) (b)(i) Similar shape curve drawn above existing line going through (0,0) allow mark f any upward smooth curve straight upward line above existing line going through (0,0) rain on road car brakes in bad condition (c)(i) all three lines crectly labelled allow mark f one crectly labelled top line C accept. middle line B accept 0.9 bottom line A accept 0.7 any two from: (table has) both variables are together both (variables) could/ would affect the reaction time accept tired and music as named variables cannot tell iginal contribution need to measure one (variable) on its own accept cannot tell which variable is affecting the drive (the most) accept need to test each separately need to control one of the variables total 9 3
Physics PHYF - AQA GCSE Mark Scheme 008 June Series PHYF Question (a)(i) electrons jumper positive accept protons accept + (iii) positively charged accept any clear way of indicating the answer (b)(i) copper it is an (electrical) conduct only accept if copper is identified do not accept it conducts heat accept it conducts heat and electricity accept copper is the best conduct accept crect description of conduction current total 7 4
Physics PHYF - AQA GCSE Mark Scheme 008 June Series PHYF Question 3 (a)(i) blue earth (iii) rubber / plastic accept any suitable named non conduct eg polypropylene do not accept bakelite do not accept an insulat (iv) (b) any two from: draws too high a current socket overloaded wiring gets too hot / melts accept power f current do not accept electricity/ electric f current accept too much current goes through the socket do not accept too many currents go through the socket it = socket do not accept circuit f socket accept socket f wiring do not accept fuse melts blows do not accept plug/ appliances overheating (may) cause a fire (may) cause sparking (possible) physical damage to the socket a physical reason, such as stick out from the wall is insufficient igne reference to electric shocks total 6 5
Physics PHYF - AQA GCSE Mark Scheme 008 June Series PHYF Question 4 (a)(i) 0.6 allow mark f crect substitution newtons accept N do not accept n accept Newtons the same as (b)(i) changed velocity accept increased/ decreased f change accept speed f velocity accept change direction accept getting faster/ slower accept start/ stop moving accept crect equation in terms of change in speed change in velocity down(wards) accept towards the ground (iii) increase velocity is increasing it is accelerating accept do not accept south can only credit second mark if answer is increase accept speed f velocity accept is moving faster accept an answer in terms of resultant fce downwards mention of weight/ mass increasing negates second mark total 8 6
Physics PHYF - AQA GCSE Mark Scheme 008 June Series Question 5 (a)(i) 4 (V) allow mark f crect substitution 5 (V) (9 their (a)(i)) crectly calculated e.c.f do not allow a negative answer (b)(i) thermist c.a.o 0 C to 0 C total 5 7
Physics PHYF - AQA GCSE Mark Scheme 008 June Series PHYF Question 6 (a)(i) protons neutrons answers may be in either der 86 (iii) two fewer protons and two fewer neutrons do not accept two fewer protons and neutrons 84 protons 34 neutrons do not accept 8 protons and neutrons (b)(i) 0.4 accept 5 / accept 40 % f marks allow mark f crect totalling =.8 allow mark f a clearly crect method with a clearly increct total any one from: nuclear weapon testing nuclear power (stations) do not accept nuclear accept nuclear/ radioactive waste nuclear accidents medical accept X-rays (c)(i) accept : accept twice as big igne units Question 6 continues on the next page 8
Physics PHYF - AQA GCSE Mark Scheme 008 June Series PHYF Question 6 continued No with a reasonable reason explained only going f two weeks so even staying f a year total exposure well under lowest limit f causing cancer Yes with a reasonable reason explained all levels of radiation are (potentially) hazardous () harm caused by lower doses may not have been recded () evidence may not be complete insufficient research into effect of small doses mark is f a time frame mark is f crectly relating to a dose accept low doses could still cause cancer accept all levels affect you do not accept radiation dose is high(er) do not accept level of background radiation is higher in Germany total 0 9