SCIENCE 101 > GCSE MARK SCHEME > Mark Scheme (Provisional) Summer 2021 Pearson Edexcel International GCSE In Science (Single Award) ( (All)

Mark Scheme (Provisional) Summer 2021 Pearson Edexcel International GCSE In Science (Single Award) (4SS0) Paper 1P. 100% proven pass rate.

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Question number Answer Notes Marks 1 (a) (i) D; 1 A is incorrect because it shows the amplitude B is incorrect because it shows half the wavelength C is incorrect because it shows double the ampl... itude (ii) A; 1 B is incorrect because it shows half the wavelength C is incorrect because it shows double the amplitude D is incorrect because it shows the wavelength (b) correct lines showing all three properties linked to their definitions;; 2 any one line correct; reject line if property is linked to more than one definition e.g. (c) D; 1 A is incorrect because both waves transfer energy and can be reflected and refracted B is incorrect because both waves can be reflected and refracted C is incorrect because both waves transfer energy Total for question 1 = 5 marks http://britishstudentroom.wordpress.com/Question number Answer Notes Marks 2 (a) (i) work (done) = force × distance (moved); allow rearrangements and standard symbols e.g. W = F × d allow E or W for work and d or s for distance 1 (ii) substitution; 3 evaluation; -1 if cm not converted to m unit; 2 012500 Ncm scores full marks e.g. (W =) 8750 × 2.3 (W =) 20 000 allow 20 125 joules / J condone Nm (iii) substitution into power formula; allow ecf from (ii) 2 evaluation; e.g. (P =) 20125 / 7.0 (P =) 2900 (W) allow 2880, 2875, 2860, 2857.14… (b) (i) idea of reducing pressure on ground; allow idea of preventing damage to the ground / stopping leg sinking into the ground 1 (ii) pressure = force / area; allow rearrangements and standard symbols e.g. F = p × A 1 (iii) evaluation of area; 4 substitution into pressure formula; allow ecf from incorrect area / use of 0.50 as area rearrangement; evaluation; -1 for POT error e.g. area = 0.50 × 0.50 OR area = 0.25 (m2) 148 000 = F / 0.25 (F =) 148000 × 0.25 (F =) 37 000 (N) 74000, 37 gets 3 marks 74 gets 2 marks Total for question 2 = 12 marks http://britishstudentroom.wordpress.com/Question number Answer Notes Marks 3 (a) (independent =) surface; allow material 2 (dependent =) distance (travelled by block); allow ‘how far the block moves’ / EQ (b) (i) mean distance evaluated correctly; 2 answer given to the nearest cm; DOP e.g. (mean distance =) 25.3… (cm) scores 1 mark (mean distance =) 25 (cm) scores 2 marks (ii) idea that there are repeat readings (which are consistent); 1 (c) idea that the data for the surface is not continuous; allow discrete, categoric, discontinuous for not continuous [Show More]

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