2023 CGS Phy Prelims P2 Ans

This paper consists of 18 printed pages (including the cover page). CRESCENT GIRLS’ SCHOOL SECONDARY FOUR PRELIMINARY EXAMINATION PHYSICS 6091/02 Paper 2 28 Aug 2023 1 hr 45 min Class: Register No: Name: READ THESE INSTRUCTIONS FIRST Write your name, index number and class in the spaces provided at the top of this page and on all separate answer sheets used. Write in dark blue or black pen. You may use a soft pencil for any diagrams, graphs, tables or rough working. Do not use staples, paper clips, highlighters, glue or correction fluids. Section A (50 marks) Answer all questions. Section B (30 marks) Answer all questions. Question 11 has a choice of parts, answer either one. 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. For Examiner’s Use Section A /50 Section B /30 TOTAL

2 Crescent 23 6091 S4 SA2 Section A (50 marks) Answer all questions. Write your answers in the spaces provided in the question paper. 1. A vernier calipers is used to measure the diameter of a small cylinder. Fig. 1.1a shows a vernier calipers and Fig. 1.1b shows the main scale and vernier scale of the vernier caliper in detail. The reading for the diameter of the cylinder is 2.15 cm. (a) (i) Describe how Fig. 1.1b shows that the reading is 2.15 cm. [2] • Main scale reading is 2.10 cm. vernier scale reading is 0.05 cm • Add the two values together to obtain 2.15 cm. (ii) State one precaution taken to find an accurate value for the diameter of the cylinder. [1] Check for zero error before using the instrument. Minus the zero error from the observed reading. OR Take a few diameter readings and find the average (b) The length of the cylinder is 0.026 m and its mass is 4.0 g. Calculate the density of the cylinder. Volume = cross sectional area x length = 3.14 x (2.15/2)2 x 2.6 = 9.4345 cm3 Density = mass / volume = 4.0 / 9.4345 = 0.424 g/cm3 density = ……………………… [3] cylinder Fig. 1.1a Fig. 1.1b

3 Crescent 23 6091 S4 SA2 2. A gymnast jumps off from a high bar from A, lands on a trampoline at B and is in contact with the trampoline between B and C. D is the highest position reached by the gymnast as she rises. Fig. 2.1 shows the velocity-time graph for the gymnast. Air resistance is negligible. (a) Table. 2 below is for the direction of motion of the gymnast and the direction of acceleration of the gymnast. Complete Table. 2. [2] direction of motion of gymnast direction of acceleration of gymnast during AB downw