Mark Scheme (Results) November 2009

Transcription

1 Mark Scheme (Results) November 2009 IGCSE IGCSE Physics (4420) Paper F Edexcel Limited. Registered in England and Wales No Registered Office: One90 High Holborn, London WCV 7BH 4420_F Nov 2009 i

2 Edexcel is one of the leading examining and awarding bodies in the UK and throughout the world. We provide a wide range of qualifications including academic, vocational, occupational and specific programmes for employers. Through a network of UK and overseas offices, Edexcel s centres receive the support they need to help them deliver their education and training programmes to learners. For further information, please call our GCE line on , our GCSE team on , or visit our website at If you have any subject specific questions about the content of this Mark Scheme that require the help of a subject specialist, you may find our Ask The Expert service helpful. Ask The Expert can be accessed online at the following link: Alternately, you can speak directly to a subject specialist at Edexcel on our dedicated Science telephone line: (If you are calling from outside the UK please dial and state that you would like to speak to the Science subject specialist). November 2009 Publications Code UG All the material in this publication is copyright Edexcel Ltd 2009 ii 4420_F Nov 2009

3 The following abbreviations have been used: ecf dop error carried forward dependent on previous owtte or words to that effect ora or reverse argument (a) friction accept air resistance or friction with the air/table or drag (b)(i) gravitational (potential) () do not credit just potential 2 kinetic () correct order essential (b)(ii) heat () accept thermal 2 sound () either order (b)(iii) chemical (Total 6 marks) 4420_F Nov 2009

4 2 (a) 45 2 (b)(i) Hooke s accept minor misspellings 2 (b)(ii) extension is (directly) proportional to load Question Acceptable Answers Extra Information Mark 2 (b)(iii) elastic () 3 removed () accept taken off longer () (Total 6 marks) 4420_F Nov

5 3 (a)(i) LDR accept ldr or Ldr 3 (a)(ii) shine a light (on it)/increase the illumination Question Acceptable Answers Extra Information Mark 3 (a)(iii) cover it/put it in the dark credit () if the answers to (a)(ii) and (a are correct but reversed 3 (b) thermistor 3 (c)(i) variable resistor allow variable resistance 3 (c)(ii)...increased... decreased or... decreased... increased (Total 6 marks) 4420_F Nov

6 Question Acceptable Answers Extra Information Mark 4 (a) either energy... information... matter or information... energy matter all correct in either case 4 (b) any one of sound (waves) ultrasound (waves) push and pull wave (on a spring/slinky/in an earthquake) P/primary (seismic waves) do not credit just seis waves or in an earthquake 4 (c)(i) transverse or electromagnetic/em (waves) 4 (c)(ii) no ecf any one of water (waves) S/secondary (seismic waves) do not credit side to side wave on a spring/slinky do not credit just seismic waves or in an earthquake light (waves) or gamma/xray/ultraviolet/infra-red /microwaves/radio (Total 4 marks) 4420_F Nov

7 5 (a) gamma rays sterilising medical if more than one link 4 equipment () to or from a box infra-red night vision equipment () then microwaves satellite transmissions () cancel all the links ultra violet fluorescent lamps () to or from the box 5 (b) speed accept velocity (Total 5 marks) 4420_F Nov

8 6 (a) all six ticked (2) any four or five ticked () otherwise (0) 2 6 (b)(i)...magnet...wire... coil...field either all four correct (2) 2 or any two correct () 6 (b)(ii) any two () each 2 increase the strength of the magnet/field /magnetic field spin/rotate/move the magnet /field/coil faster more turns on coil larger area of coil do not credit just use a bigger magnet accept greater (relative) movement (Total 6 marks) 4420_F Nov

9 7 (a)(i)... neutrons... protons both required but either order 7 (a)(ii) protons () neutrons () correct order essential 2 7 (a)(iii)... electrons... protons both required but either order 7 (b)... particles... particles... rays all three correct (2) 2 any two correct () otherwise (0) (Total 6 marks) 4420_F Nov

10 8 (a) arrow from centre (by eye) of X vertically (by eye) downwards 8 (b)(i) 90 (seconds) (2) or.5 x 60 for () 2 8 (b)(ii) (average) speed = distance (moved) time (taken) allow any correctly transposed version Question Acceptable Answers Extra Information Mark 8 (b)(iii) 6 (m/s) (2) or 500 or () 2 90 (Total 6 marks) 4420_F Nov

11 9 (a)(i)... friction... do not credit just rubbing... wool/ cloth... polythene/rod correct order essential 9 (a)(ii) (electrical) conductor do not credit reference to heat conductor Question Acceptable Answers Extra Information Mark 9 (b) sparking/(a) spark () 2 (an) exploding () allow (a) fire (Total 5 marks) 4420_F Nov

12 0 (a)(i) state 0 (a)(ii) evaporating/evaporation 0 (b) liquid 0 (c) (pressure) increases () accept any unambiguous indication 2 accept any unambiguous indication (mass) stays the same () (Total 5 marks) 4420_F Nov

13 (a) wire melts/blows breaks circuit/no current (b) Use of P = V I 500 / 240 = 6.25 (A) 3 (c)(i) 3A (c)(ii) all the others would blow dop (d) toaster / oven / kettle /bread machine /soldering iron etc. not microwave (Total 8 marks) 4420_F Nov 2009

14 2 (a)(i) protons and neutrons/ Helium atom 2 2p + 2n /He nucleus/nuclei scores 2 Question Acceptable Answers Extra Information Mark 2 (a)(ii) another source of background radiation buildings rock soil nuclear power medical uses radon etc 2 (b) less absorption/space less dense or vacuum owtte 2 (c)(i) time for activity to halve owtte 2 (c)(ii). method shown on graph (years) 2. count similar to background/no (carbon- 4) activity 2 (c)(iii) smoke detector sterilising tracers checking welds cancer treatment etc accept medical (Total 8 marks) 4420_F Nov

15 3 (a) force distance either order direction independent marks 3 (b) 2000/ 5 = 400 (W) 3 (c)(i) efficiency = useful output energy/ input energy = ( input energy waste energy) / input energy 3 (c)(ii) / = 0.4 or 40% 0.4 scores 3 (c) marks (Total 8 marks) 4420_F Nov

16 4 (a)(i) (loft) insulation or named material 4 (a)(ii) curtains/shutters/double glazing/triple glazing 4 (b) air heated/hot air expands / less dense rises not lighter ora (Total 5 marks) 4420_F Nov

17 5 (a) 2 nd 5 th 2 5 (b)(i) one line with arrow second line with arrow do not credit either if they contradict 5 (b)(ii) attract / move towards 5 (b)(iii) opposite poles attract independent mark no ecf 5 (c)(i) flat circular coil allow solenoid 5 (c)(ii) (no) lines not evenly spaces and/or parallel (Total 8 marks) 4420_F Nov

18 Question Acceptable Answers Extra Information Mark 6 (a) A diffraction B reflection C refraction independent marks 6 (b) wavelength changes 2 wavelength reduced scores both marks 6 (c) wavefront(s) as concave curve(s) more curved than A 2 three equally spaced independent marks (Total 7 marks) PAPER TOTAL: 00 MARKS 4420_F Nov

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