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Mark scheme for IGCSE Physics (0625/6) – Alternative to Practical October/November 2001 1 (a)(i) (ii) (b) 2 (a)(i) (ii) (b) 3 (a)(i) (ii) (iii) (iv) (b) 4 (a)(i) (iii) (b)(i) (ii) 5 (a)(i) (ii) (b) Graph:, axes, labelled, d/mm against L / N scales suitable plots 6 correct line judgement reading to 1/2 square clearly shown Any two from: horizontal rule at top vertical rule in centre clamped rule in centre rule in centre resting on floor 1 1 3 1 1 1 0.22, 0.23, 0.17(5) correct all correct all to 2/3 s.f. unit (at least once) circuit: lamps in parallel voltmeter correct ammeter correct (for any one lamp) 2 1 1 1 h = 18(mm) t = 1.2mm correct arithmetic unit d correct arithmetic 2/3 s.f. mass on correct side approximately twice as far from pivot (by eye) (between 35 and 40) 1 1 1 1 1 1 1 35, 23, 32 correct Any two from: same initial temperature same size cans same distance from heater same time same room temperature R 18 - 19°C clear how obtained 1 lines correct, thin and neat 30o ± 1o Any two from: view base of pins ensure vertical pins as far apart as possible (or > 5cm) 1 1 1 2 10 1 1 1 8 1 8 2 1 1 1 6 (c)(i) (ii) (iii) use a third pin 2.4 ± 0.1 cm 6.8 ± 0.1 cm n = 1.3 - 1.5 (from correct arithmetic) no unit and 2/3 s.f. 2 2 1 1 1 1 8