2023 CGS Phy Prelims P3 Ans

CRESCENT GIRLS’ SCHOOL SECONDARY FOUR PRELIMINARY EXAMINATION 6091/03 PHYSICS 18 AUGUST 2023 PAPER 3 Practical 1 hour 50 minutes This document consists of 11 printed papers. P R For Examiner’s Use Q1 /10 Q2 /10 Q3 /20 Total /40 Shift Laboratory Class: Register No: Name: ms READ THESE INSTRUCTIONS FIRST Write your name, register number and class in the spaces provided at the top of this page. Give details of the practical shift and laboratory where appropriate, in the boxes provided. Write in dark blue or black pen. You may use a 2B pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions 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 working or if you do not use appropriate units. Qualitative Analysis Notes are printed on page 9. 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.

2 CRESCENT/PRELIM/P3 DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN DO NOT WRITE IN THIS MARGIN Section A 1. In this experiment, you will determine the density of a sphere. You are provided with • five glass spheres, • two half-metre rules, • two set squares, • access to electronic balance. (a) Place the two half-metre rules parallel to one another, with a gap between the two, as shown in Fig. 1.1. Fig. 1.1 (top view) Ensure that the spheres are touching each other and are in a line. Measure the total length L occupied by the 5 spheres. L = 8.0 cm (accept 7.5 to 8.5) (b) Describe, with the aid of a diagram, how you ensured that L was determined as accurately as possible. • Use of set squares at each end of the channels to take scale readings. (accept to grip sphere / hold sphere so that there are no gaps) • One edge of the set square must be aligned with the edge of the ruler. ………………………………………………………………………………………………….. Glass sphere Half metre rule Half metre rule L Set square Glass sphere Half metre rule Half metre rule L

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