CHS 2022 - Sec 4 PHYSICS Prelim Exam paper 2 - Questions

Name: Index Number: Class: CATHOLIC HIGH SCHOOL Preliminary Examination Secondary 4 (O-Level Programme) PHYSICS 6091/02 Paper 2 Theory 14 September 2022 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, index number and class on all the work you hand in. Write in dark blue or black link. You may use a HB pencil for any diagrams or graphs. Do not use paper clips, glue or correction fluid. Section A Answer all questions. Section B Answer all questions. Question 13 has a choice of parts to answer. Candidates are reminded that all quantitative answers should include appropriate units. The use of an approved scientific calculator is expected, where appropriate. Candidates are advised to show all their working in a clear and orderly manner, as more marks are awarded for sound use of Physics than for correct answers. The number of marks is given in brackets [ ] at the end of each question or part question. For examiner’s use only: Section A / 50 Section B / 30 Total / 80 Overall Marks % Paper 1 40 30% Paper 2A 50 50% Paper 2B 30 Paper 3 40 20% This document consists of 26 printed pages. 50  s.f.  formula Paper 2A

2 Section A Answer all the questions in this section. 1 Fig. 1.1 shows three forces acting on an object on a horizontal surface. Fig. 1.1 By considering the resultant of the 10 N and 15 N forces, draw a scale diagram in the space below to determine the magnitude of a fourth force that is needed to keep the object in equilibrium. force = [4] 10 N 15 N 8 N 20

3 2 Fig. 2.1 shows a cycle track. Fig. 2.1 A cyclist starts at A and follows the path ABCDEB. The speed-time graph of the cyclist is shown in Fig. 2.2. Fig. 2.2

4 (a) Using the information from both Fig. 2.1 and Fig. 2.2, describe the motion of the cyclist (i) along AB, [1] (ii) along BCDEB. [1] (b) The velocity v of the cyclist at C is shown in Fig. 2.1. State one similarity and one difference between the velocity at C and the velocity at E. similarity difference [2] (c) Calculate (i) the distance along the cycle track from A to B, distance = [1] (ii) the circumference of the circular part of the track. circumference = [1]

5 3 (a) For a special parade, the guest of honour is to sit on a chair while the parade passes by. Unfortunately, the ground beneath the chair is soft, so the parade organisers placed the chair on a large flat board, as shown in Fig. 3.1. Fig. 3.1 (i) Using ideas about pressure, explain why the board prevents the chair from sinking into