ACS 4NA Physics Paper 2

Anglo-Chinese School (Barker Road) PRELIMINARY EXAMINATION 2021 SECONDARY FOUR NORMAL ACADEMIC SCIENCE (PHYSICS) 5105 / 02 PAPER 1 AND PAPER 2: 1 HOUR 15 MINUTES INSTRUCTIONS TO CANDIDATES: Write your Name, Class and Exam Index Number at the top of this page. INFORMATION FOR CANDIDATES: 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 longer 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 answers to Paper 1 and Paper 2 separately. The number of marks is given in the brackets [ ] at the end of each question or part question. This question paper consists of 11 printed pages. For Examiner’s Use Paper 1 / 20 Paper 2 Section A / 14 Section B / 16 Total / 50 Index Number Class: ………… Name: ………………………………………………...…

Anglo-Chinese School (Barker Road) 2 Preliminary Examination 2021 Sec 4 Normal Academic Science (Physics) 5105 SECTION A (14 marks) Answer all the questions. Write your answers in the spaces provided on the question paper. 1 A hydraulic system consists of two cylinders and a flexible pipe that joins them. Two pistons keep the oil in the cylinders. The arrangement is shown in figure below. The cross-sectional area of the larger cylinder is twice the cross-sectional area of the smaller cylinder. A force is applied on the smaller piston and the is pressure transmitted through the oil to the larger piston. The pressure at the larger piston is equal to the pressure at the smaller piston. (a) State and explain whether the force at the larger piston is greater than the force at the smaller piston. …………………………………………………………………………………………..... ……………………………………………………………………………………….…… ………………………………………………………………………………………….… …………………………………………………………………………………………..... [2] (b) Describe what happens to the molecules of oil when the temperature increases. ……………………………………………………………………………………………. ……………………………………………………………………………………………. [1]

Anglo-Chinese School (Barker Road) 3 Preliminary Examination 2021 Sec 4 Normal Academic Science (Physics) 5105 2 Two identical rooms are installed with two different air conditioners A and B respecitvely. Each air conditioner is switched to cool the room. The table shows the initial temperature of the room before the air conditoner is switched on and the final temperature of the room if the air conditioner is switched on. day initial temperature of room / °C (before air conditioner is switched on) final temperature of room / °C (air conditioner A switched on) final temperature of room / °C (air conditione