2022 CWSS Prelim 4NA SCI(PHYSICS) P2_final

COMMONWEALTH SECONDARY SCHOOL PRELIMINARY EXAMINATION 2022 SECONDARY FOUR NORMAL (ACADEMIC) Name: _____________________________________ ( ) Class: ___________ SCIENCE (PHYSICS) Paper 2 5105/02 12 Aug 2022 (Fri) 1130 - 1245 Candidates answer on the Question Paper No additional materials are required. Papers 1 and 2: 1 hour 15 minutes READ THESE INSTRUCTIONS FIRST Write your name, index number and class on all work you hand in. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions in Section A and any two questions in Section B. The use of an approved scientific calculator is expected, where appropriate. In calculations, you should show all the steps in your working, giving your answer at each stage. You are advised to spend no more than 30 minutes on Paper 1. You may proceed to answer Paper 2 as soon as you have completed Paper 1. At the end of the examination, hand in your answer to Paper 1 and Paper 2 separately. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Section A 14 Section B Q5: Q6: Q7: 16 Name of setter: Ms Ye Dan Total 30 Parents’ / Guardian’s Signature This document consists of 11 printed pages. [Turn over

2 Section A Answer all the questions in the spaces provided. 1 Name the most suitable apparatus used to measure the (a) mass of a wooden block, ………………………………………………………………... (b) thickness of an IC card, ……………………………………………………………......... (c) period of a simple pendulum, …………………………………………………………… [2] 2 A suitcase lies on the floor, as shown in the diagram. A man lifts the suitcase up by exerting an upward force of 30 N at the handle grip and turning it about the wheels. The wheels are locked from rotating. (a) Calculate the moment produced by the upward force of 30 N. Indicate the direction of the moment. moment = ………………………… N cm direction of moment is …………………………….. [2] (b) The man extended the handle of the suitcase further before lifting it. Explain how this helps him to lift the suitcase with a smaller force. ……………………………………………………………………………………………… …………………………………………………………………………………………... [1]

3 3 When a computer chip works, it generates a lot of heat. A heat sink with black fins is usually fitted to the top of the chip to cool it by transferring heat to the surrounding. A heat sink fitted to a heated computer chip is tested in an air-conditioned laboratory. The temperature of the computer chip is measured for 2 minutes. The results obtained are shown in the table. time / s temperature / °C 0 76 20 56 40 42 60 33 80 27 100 24 120 22 xxx (a) (i) Plot a graph on the grid to show how the temperature varies with time. Mark each point with a cross (x).