Pure Physics Nov 2019_TYS ANSWERS

Nov 2019_Suggested ANSWERS_as at 1 Oct 2020 Page 1 of 6 – Nov 2019 Catholic High School | O-Level Physics NOT IN SYLLABUS: 6091 Nov 2019 P1: - Suggested Answers P2: - Paper 1 [40 marks] 1 A 11 B 21 A 31 A 2 B 12 B 22 D 32 A 3 A 13 D 23 B 33 B 4 D 14 C 24 D 34 B 5 A 15 B 25 D 35 D 6 C 16 B 26 C 36 D 7 D 17 C 27 B 37 B 8 A 18 D 28 A 38 A 9 C 19 A 29 C 39 D 10 C 20 B 30 D 40 D *Q. 5: A C corresponds to the average acceleration between t = 0 and t = 30 s and not to the instantaneous acceleration at the latter time. (C is incorrect.) *Q. 7: D It is necessary to convert the values into units which students remembered. (B and C are incorrect.) *Q. 10: C A can be obtained wrongly by dividing the weight of the block by the correct area but leaving it in cm2. (A is incorrect.) *Q. 12: B To obtain D, it would have been necessary to add the pressure due to the mercury thread to that of the atmosphere. The pressure of the trapped air, however, must be less than that of the atmosphere. (D is incorrect.) *Q. 18: D It is possible to increase the temperature of a gas with increased or constant volume. Likewise, an increase in temperature may occur with increased or constant pressure. An increase in the temperature, however, must be accompanied by an increase in the internal energy irrespective of what else happens. (A and B are incorrect.) *Q. 19: A Those who chose A or C realised that the heat capacity of the smaller block is less than that of the larger block, while the specific heat capacity is a constant for copper. For those who chose C, they were unaware that the internal energy of a larger block of copper is greater than tha t of a smaller block, given the circumstances described in the question. Those who chose B may have confused heat capac ity and specific heat capacity.

Nov 2019_Suggested ANSWERS_as at 1 Oct 2020 Page 2 of 6 – Nov 2019 Those who chose D must have believed that all of the quantities depended only on the temperature of the block. (B, C and D are incorrect.) *Q. 28: A This question was difficult to approach systematically. It was necessary to consider what would happen in each of the four arrangements. The light in the first option behaves in the expected way and this would have been clear to those with a good understanding of total internal reflection. (B, C and D are incorrect.) *Q. 29: C Both the pen and the cloth are charged as the pen is rubbed, and the charging is a result of the transfer of electrons. Those who concentrated on the idea of attraction or repulsion and did not consider the need to deduce, first of all, whether the cloth and the pen had similar or opposite charges. (B is incorrect.) *Q. 30: D A did not conserve the total quantity of charge on the sphere. The charge has to be conserved as the sphere is positioned on an insulating mat. This option correctly shows the repulsion of negative charge to the righ