Paper 4 Jun 2000 Physics

Answer guide for O Level Physics (5054/4) – Paper 4 Alternative to Practical June 2000

1(a)(i)

(ii) (iii)

(b)

2(a) (b) (c)

(d)

3(a) (b)(i)

(ii) (iii) (c)

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To prevent the card from sticking / so that the card’s centre of mass is behind the plumb-line / so that the centre of mass of the card is below the pivot Arranged so that the line of sight is perpendicular (vertical allowed) to the plumb-line (or card) It helps to avoid parallax / it helps to obtain the correct positio for making marks or drawing on the card (‘easily’ is not sufficien for a mark) Choice Z Reason The angle between the lines is large(st) / the diagram showing near perpendicular lines or similar clear reason Accurate location of the centre of mass / ‘sharpness’ or ‘clarity’ of intersection / on a diagram

‘Three’ near perfect lines (straight, neat and through C) (additional lines are not penalised) ‘Below’ or equivalent Any three from: Real Inverted Enlarged Ratio of separation of images same as that for object holes v longer than u Any two (1) Line from N through C misses the screen / the screen is too small for the image of N to be formed (A correct line on the diagram can be accepted)

± 0.25 degree for the position of the required lines at 60.5 o C and at ± 1.8 o C Suitable hot body having a larger thermal capacity (metal or liquid in container with a lid) Plus a means to insert a thermometer Suitable means of support that will work Temperature recorded from 100 o C to 40 o C for each Shielding has the lowest rate of cooling or 1.1 < 1.4 < 1.8 or 1.1 < the other two rates

© UCLES 2002

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Answer guide for O Level Physics (5054/4) – Paper 4 Alternative to Practical June 2000

4(a)

Labelled table Units for t and T

(b)(i)

T is very small or approximately 0.7 s for W = 5 Timing errors reduced / accurate by using more oscillations/ correct reference to 28 s 1 Mass / weight / volume / thickness / inertia 1 0.87 s (the value for 2 ∫ washers) 1

(ii) (c)

5(a) (b)(i)

(ii)

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V x p is not constant Correct, labelled axes including scaling Easy to use and occupying at least half the space provided Plotting to the nearest ∫ small square Good line judgement relative to the plotted points, neat and thin Method clear using at least half the line if straight or appropriate tangent if curved Accurate interpolation, nearest half small square of grid Presentation, correct arithmetic rounded to 2 or 3 s.f.

© UCLES 2002

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