Pure Physics Nov 2020_TYS ANSWERS

Nov 2020_Suggested ANSWERS_as at July 20231 Page 1 of 6 – Nov 2020 Catholic High School | O-Level Physics NOT IN SYLLABUS: 6091 Nov 2020 P1: - Suggested Answers P2: - Paper 1 [40 marks] 1 C 11 A 21 D 31 B 2 C 12 D 22 A 32 C 3 B 13 D 23 D 33 C 4 C 14 A 24 B 34 B 5 D 15 C 25 C 35 C 6 B 16 D 26 B 36 C 7 A 17 A 27 C 37 B 8 D 18 B 28 A 38 C 9 D 19 D 29 B 39 B 10 A 20 C 30 C 40 C *Q. 4: C Students have to recognise that air resistance affects the behavior of the ball. (A and B are incorrect.) *Q. 7: A Students have to recognise that both balls being copper indicates that they have the same density. (B is incorrect.) *Q. 9: D Question was asking for the force exerted by the shoulder on stick, not F. (C is incorrect.) *Q. 11: A Students have to read the question carefully to obtain the correct information for density and height of liquid column instead of following the usual symbols. (B and C are incorrect.) *Q. 14: A To solve this question, we have to find the GPE gained and the distance moved by the box along the slope. The distance moved by the box along the slope has to be solved using Pythagoras’ Theorem. (D is incorrect.) *Q. 22: A Those who chose C did not understand that “moves backwards and forward s between two positions” means that the point is oscillating between two extreme ends whose distance apart is twice the amplitude. (C is incorrect.) *Q. 24: B Students may have mistakenly thought that when the object moves towards the lens, the image will also move toward the lens. (C and D are incorrect.) *Q. 28: A Students may have thought that the position of the earth connection affects the movement of electrons through the earth connection. (C is incorrect.)

Nov 2020_Suggested ANSWERS_as at July 20231 Page 2 of 6 – Nov 2020 *Q. 29: B The key difficulty for this question was to determine the rate of flow of electrons that is related to but different from the rate of flow of electric charge. Students have to use the information about current to determine the answer. (A, C and D are incorrect.) *Q. 30: C To solve this question, students have to add the e .m.f. of cells in the same configuration and then subtract those with the reverse configuration. (A and B are incorrect.) *Q. 34: B Students have to recall that fuses are designed to prevent excessive current from flowing through the appliance as it will melt. (D is incorrect.) 5

Nov 2020_Suggested ANSWERS_as at July 20231 Page 3 of 6 – Nov 2020 Paper 2 [80 marks] 1 a Vector: Displacement, acceleration, force, moment of a force (any one) Scalar: Distance, time, energy (any one) 1 bi Velocity of the point will change from 0.24 m / s in one direction to 0.24 m / s in the opposite direction and then back to 0.24 m / s in the initial direction. There is no net change in velocity at the end of one complete rotation even though its directio