4N 2021 PHY PY PAPER 2

[Turn over This exam paper is the property of Ping Yi Secondary School. It must not be duplicated in part or whole. This document consists of 12 printed pages, including this cover page. ‘Perseverance Yields Success’ Ping Yi Secondary School Preliminary Examination 2021 Secondary 4 Normal Academic SCIENCE (PHYSICS) 5105/02 Paper 2 Papers 1 and 2: 1 hour 15 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, class and register number in the spaces at the top of this page. Write in dark blue or black pen. You may use a 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 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 brackets [ ] at the end of each question or part question. FOR EXAMINER’S USE Paper 1 20 Paper 2 Section A 14 Paper 2 Section B 16 Total 50 Expected Grade □ 1 □ 2 □ 3 □ 4 □ 5 Teacher’s Comment Student’s Comment Parent’s Comment and Signature

[Turn over This exam paper is the property of Ping Yi Secondary School. It must not be duplicated in part or whole. 2 Paper 2 Section A (14 marks) Answer all questions in the spaces provided. 1 An uncooked meat ball of 55 g is placed into a beaker containing 250 cm3 of water and the water level rises to 300 cm3. Heat is applied to the beaker as shown in Fig. 1.1. Fig. 1.1 (a) Calculate the density of the uncooked meat ball. density of uncooked meat ball = ………………….. g/cm3 [2] (b) When the meat ball is cooked, its volume increases by 10 cm3. Calculate the density of the cooked meat ball. density of cooked meat ball = ………………….. g/cm3 [1] (c) Explain the differences that will be observed if the meatball is cooked using pure water with a density of 1.0 g/cm3. …………………………………………………………………………………………. ……………………………………………………………………………………..…[1]

[Turn over This exam paper is the property of Ping Yi Secondary School. It must not be duplicated in part or whole. 3 2 Fig. 2.1 shows three different tins. Each tin is fully filled with hot water at a temperature of 90 oC. Fig. 2.1 A and B are of the same size. C is smaller than A and B. A has a shiny silver surface. B and C have dark dull surfaces. (a) Identify the two tins you would use to investigate how the rate of radiation depend