2025 BTYSS Prelim S4 G2 SP P2 SAK (final)

BEATTY SECONDARY SCHOOL PRELIMINARY EXAMINATION 2025 SECONDARY FOUR NORMAL (ACADEMIC) / G2 CANDIDATE NAME CLASS REGISTER NUMBER SCIENCE (PHYSICS) 5105/02 Paper 2 Structured (Physics) 4 August 2025 Setter: Mr Jerrod Lo 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 on all the 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 one question 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 A 22 B….. 8 Total 30 This document consists of 15 printed pages and 1 blank page. [Turn over

2 Section A Answer all the questions in the spaces provided. 1 A mobile phone emits and receives four different types of waves, W, X, Y and Z. W, X and Y are electromagnetic waves. When the phone gets warm, it gives off W. The phone receives wireless signals using X, which has higher frequencies than television broadcast waves. The screen emits Y, which lets us see colours. The speakers produce Z, which are longitudinal waves that we can hear. Based on the information, identify the waves W, X, Y and Z. W is …………………………………… X is ……………………………………. Y is ……………………………………. Z is ……………………………………. [2] [Total: 2] speakers W X Y Z screen infra-red radiation microwave sound visible light Any two correct – [1]

3 2 A pile of paper rests on a horizontal surface. The weight of the pile of paper is 27.2 N. (a) Calculate the density of the paper. Use g = 10 N / kg in your calculations. density = ……………… kg / m3 [2] (b) The sheets of paper are uniformly folded in half and restacked to form a new pile on the horizontal surface. Calculate the minimum pressure on the horizontal surface due to the new pile of paper. pressure = ……………… N / m2 [1] [Total: 3] 0.320 m 0.250 m 0.040 m horizontal surface pile of paper P = F ÷ A P = 27.2 ÷ (0.5 × 0.320 × 0.250) P = 680 N / m2 [1]