2021 J2 H2 Physics Prelim P4

This paper consists of 21 printed pages p Anglo-Chinese Junior College Physics Preliminary Examination Higher 2 CANDIDATE NAME CLASS CENTRE NUMBER S 3 0 0 4 INDEX NUMBER PHYSICS Paper 4 Practical Candidates answer on the Question Paper. Additional Materials: As listed In the Confidential Instructions 9749/04 5 August 2021 2 hours 30 mins READ THESE INSTRUCTIONS FIRST Write your name and index 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 the appropriate units. Give details of your 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. Shift Laboratory For Examiners’ use only 1 / 9 2 / 13 3 / 21 4 / 12 Total / 55

2 Anglo-Chinese Junior College 2021 J2 H2 9749 Paper 4 Preliminary Examination For Examiner’s Use 1 In this experiment, you will investigate the equilibrium of a metre rule. (a) (i) You have been provided with a metre rule with two springs attached. The distance between one end of the metre rule and the string is L, as shown in Fig. 1.1. Fig. 1.1 Measure and record L. L = …………………………….. [1] (ii) Calculate L n where n = 3. L n = ……………………………....

3 [Turn over Anglo-Chinese Junior College 2021 J2 H2 9749 Paper 4 Preliminary Examination For Examiner’s Use (b) (i) Set up the apparatus as shown in Fig. 1.2. Fig. 1.2 Adjust the apparatus until the horizontal distance between the centres of the rods of the clamps is equal to your value of L n . Adjust the heights of the bosses so that the rule is horizontal and the springs are vertical and unstretched when the rule is held in position. Gradually release the rule by lowering your hand. The rule will tilt. The angle between the rule and the horizontal is θ, as shown in Fig. 1.3. Fig.1.3 Measure and record θ. θ = …………………………….. [1]

4 Anglo-Chinese Junior College 2021 J2 H2 9749 Paper 4 Preliminary Examination For Examiner’s Use (ii) Estimate the percentage uncertainty in your value of θ. percentage uncertainty in θ = …………………………….. [1] (c) The quantities θ and n are related by the equation 2sin θ = C (0.5 n