Paper 4 Nov 2001 Physics

Answer guide for O Level Physics (5054/4) – Paper 4 Alternative to Practical November 2001

1(a) (b) (c)(i) (ii)

2(a)

(b)

3(a)

(b) (c)

4(a)

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0.51 47.05 92.2 to 92.3 (units not required) The presence of dissolved impurity / substance reduces the amount of water absorbed The sample of water was very pure “Distilled water not as pure as the manufacturers” allowed

Screen and object perpendicular to rule / rule placed close to apparatus Smallest division mm View perpendicular to scale reading An aid identified

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The use of the aid described Their centres are on the same height / position / on a common axis (or shown on the diagram)

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198 – 200 0.16 64.4 64 / 64.0 As the length is increased the frequency decreases. f x l = constant

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Any three from: ITEM Thermometer Clock lid / cork second thermometer large shield measuring cylinder stirrer

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USE to measure the temperature to obtain temperature/time data to reduce convection / evaporation to monitor room temperature to reduce uneven cooling by draughts to obtain the same volume of water to maintain a uniform water temperature

© UCLES 2002

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Answer guide for O Level Physics (5054/4) – Paper 4 Alternative to Practical November 2001

5(a)

(b)(i) (ii)

Page 2 of 2

Correct axes with a label, scaled with unit Accurate plotting of at least six points Good straight line The graph is linear/ straight / directly proportional / change in I increases at the same rate as the change in N Correct working shown New resistance = 1012 (ohm not essential)

© UCLES 2002

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