EJC 2024 J2 H2 PRELIM QP P4

©EJC 2024 9749/04/J2H2Prelim/2024 [Turn over EUNOIA JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATIONS 2024 General Certificate of Education Advanced Level Higher 2 CANDIDATE NAME CIVICS GROUP 2 3 - REGISTRATION NUMBER PHYSICS Paper 4 Practical 9749/04 August 2024 2 hours 30 minutes Candidates answer on the Question Paper. Additional Materials: As listed in the Confidential Instructions READ THESE INSTRUCTIONS FIRST Write your name, civics group and registration number in the spaces 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. 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, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 20 printed pages and 4 blank pages. Shift Laboratory For Examiner’s Use 1 10 2 12 3 22 4 11 Total 55

2 ©EJC 2024 9749/04/J2H2Prelim/2024 1 In this experiment, you will investigate the effect of friction on a simple pulley system. (a) You are provided with a spring of unstretched length 0L , as shown in Fig. 1.1. Fig. 1.1 Measure and record 0L . 0L = (b) Set up the apparatus as shown in Fig. 1.2. Fig. 1.2 Ensure that the pipe remains horizontal at all times, and that the strings on each side of the pipe are vertical and parallel with each other. The spring should only stretch minimally at this instant. L0 string mass hanger spring retort stand boss clamp clamp bench PVC pipe boss string G-clamp

3 ©EJC 2024 9749/04/J2H2Prelim/2024 [Turn over (i) Place the 100 g slotted mass onto the mass hanger and slowly lower the mass hanger, allowing the spring to extend to a new equilibrium length 1L , Measure and record 1L . 1L = [1] Calculate the extension 1x of the spring from its unstretched length, where 1 1 0x L L=− 1x = [1] (ii) Estimate the percentage uncertainty in your value of 1x . percentage uncertainty in 1x = [2]

4 ©EJC 2024 9749/04/J2H2Prelim/2024 (iii) Pull the mass hanger downwards by about 20 cm, causing the spring to extend further. Hold the hanger while allowing it to slowly rise upwards until the spring retracts to another equilibrium length 2L , where 2L is larger than 1L . Measure and record 2L . 2L = Calculate t