2022 SJI Phy Prelims P3 w Ans

ST JOSEPH’S INSTITUTION PRELIMINARY EXAM 2022 (YEAR 4) CANDIDATE NAME CLASS INDEX NUMBER Physics Paper 3 Additional Materials: Nil 6091/03 22 August 2022 1 hour 50 minutes READ THESE INSTRUCTIONS FIRST Write your name, class and index number at the top of this page and all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, glue or correction fluid. Answer all questions in the Question Booklet. You will be allowed to work with the apparatus for a maximum of 55 minutes for each section. You are expected to record all your observations as soon as they are made. The use of an approved scientific calculator is expected, where appropriate. 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 Examiner’s Use 1 2 3 Total / 40

2 This document consists of 13 printed pages including this cover page Section A 1 In this experiment, you will determine the period of oscillation of a suspended rule. You are provided with ● a 30 cm rule ● a half metre rule ● a metre rule ● two retort stands ● a stopwatch The apparatus in Fig. 1.1 has already been set up for you. Fig. 1.1 (a) The metre rule has been adjusted horizontally for you. Describe the process needed to check that the half-meter rule is parallel to the metre rule. Use another metre rule to measure the vertical/perpendicular distance between the two ends of the half-metre rule to the metre rule. If the distances are the same, the two rules are parallel. …………………………………………………………………………………….……[1] (b) (i) Measure the length l along the thread that connect the two rules as shown in Fig. 1.1. l is measured to the correct precision of metre rule: 0.001 m = 0.1 cm

3 l is within range (19.0 – 22.0) length 𝑙 = ……………………………… [1] (ii) Explain one difficulty in obtaining an accurate value for l. …………………………………………………………………………………...... ………………………………………………………………………………… [1] ● The ruler/the thread keeps on moving/shaking as it is suspended in the air, hence l is an estimation. ● The thread may extend as it is being measured. (iii) Measure d, the distance between the two loops on the lower rule. d is measured to the correct precision of metre rule: 0.001 m = 0.1 cm d is within range (39.0 – 41.0 cm) distance d = ……………………………… [1] (c) (i) By using the clips, adjust the threads until x𝑥, the distance between the loops on the upper rule, is 0.400 m. (ii) Rotate one end of the lower rule towards you and the other end away from you, each by the same small angle so that the middle of the rule does n