Paper 3 Jun 2001 Physics

Answer guide for O Level Physics (5054/3) – Paper 3 Practical Test June 2001

1(a)

(b)(i)

(ii)

Method described or shown to show; Mass of empty measuring cylinder Mass of cylinder and liquid Volume of liquid in cylinder

Volume of greater than or equal to 80 cm3 used 1 Sensible value for mass (numerically slightly greater than the value 1 for the volume) with unit Correct calculation of density with unit 1 Value 1.01 to 1.03 g / cm3 to 3 or 4 s.f.

2(a) (b) (c) (d)

(setting up apparatus – no answer required) Real, inverted and magnified image

(e) (f) (g)

Real, inverted and diminished image d between 30 cm and 50 cm smaller than D with unit Correct calculation of f with unit from reasonably sensible D and d

3(a) & (b) (c) & (d)

(setting up apparatus – no answer required) 10 oscillations timed for at least one period measurement Repeat measurement seen for at least one period measurement Correct calculation of ratios from sensible periods Values same within 10% and 2 to 4 s.f. e.g. 1.50 x 10-3 to 1.9 x 10-3 if periods in seconds and masses in grams

(e)

(f)

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D in range 60 cm to 100 cm for 15 cm focal length lens with unit (setting up apparatus – no answer required)

Period squared is directly proportional to mass or T2 / m = constant

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Answer guide for O Level Physics (5054/3) – Paper 3 Practical Test June 2001

4(a)

(b) * (c) (d) (e)

(f)

Diagram: Series connection of power supply, switch, rheostat and ammeter (voltmeter connected in series = 0) Voltmeter and jockey correctly connected

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Readings I approximately 0.15 A and V approximately 0.4 V, both recorded to 0.01 with units Correct calculation of R with unit Table with units Range of l of at least 0.6 m 6 points ± 0.1 _ from best straight line

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Graph R / _ against l / m with axes labelled and units Vertical axis 1 cm = 0.2 _ or 1 cm = 0.25 Horizontal axis 1 cm = 0.1 m or 1 cm = 0.05 m At least two points plotted correctly Good fit, fine straight line and fine points

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Calculations and conclusions (g)

(h)

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_x_y of triangle > 100 cm2 Correct reading of sides of triangle Resistance increases linearly with length (if straight line with intercept) Resistance directly proportional to length (if straight line through origin) Gradient is resistance per metre or resistance per unit length

© UCLES 2002

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