HCI 2024 H2 Physics Paper 4 Solutions

This paper consists of 24 printed pages, including 3 BLANK pages. HWA CHONG INSTITUTION C2 Preliminary Examination Higher 2 CANDIDATE NAME Suggested Solutions CT GROUP 23S TUTOR NAME PHYSICS Paper 4 Practical Candidates answer on the Question Paper. No Additional Materials are required. 9749/04 22 August 2024 2 hours 30 mins INSTRUCTIONS TO CANDIDATES Write your name, CT group and tutor’s name in the boxes at the top of this page. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. Answer all questions. You will be allowed a maximum of one hour to work with the apparatus for Questions 1 and 2, and a maximum of one hour for Question 3. You are advised to spend approximately 30 minutes on Question 4. Write your answers in the spaces provided on the question paper. The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. Give details of the practical shift and laboratory, where appropriate, in the boxes provided. At the end of the examination, submit sets A, B and C separately. The number of marks is given in brackets [ ] at the end of each question or part question. Shift Laboratory For Examiner’s Use 1 / 12 2 / 9 3 / 22 4 / 12 Total / 55 A

2 Hwa Chong Institution 9749 / 04 / C2 Preliminary Examination 2024 BLANK PAGE

3 Hwa Chong Institution 9749 / 04 / C2 Preliminary Examination 2024 1 In this experiment, you will investigate the period of torsional oscillations of a suspended disc with loaded mass. (a) Set up the apparatus as shown in Fig. 1.1. Fig. 1.1 Disc A and disc B have three small holes spaced at regular intervals near the edge. Pieces of string have been threaded through the holes. Clamp disc B horizontally using two small blocks of wood. Use the clips on disc B to adjust the length l of each string until l is about 100 cm. Place a 50 g mass in the centre of disc A. clips l stand disc B disc A

4 Hwa Chong Institution 9749 / 04 / C2 Preliminary Examination 2024 (b) (i) Gently rotate disc A through a small angular displacement and release it so that the disc performs torsional oscillations of period T in a horizontal plane as shown in Fig. 1.2. Deter