YHSS 4NA PRELIM SciPhy 2022 Paper 2

YUHUA SECONDARY SCHOOL PRELIMINARY EXAMINATION 2022 SECONDARY FOUR NORMAL (ACADEMIC) 4NA CANDIDATE NAME CLASS INDEX NUMBER SCIENCE (PHYSICS) 5105 / 02 Paper 2 17 August 2022 Papers 1 and 2: 1 hour 15 minutes Candidates answer on the Question Paper. Setter: Mr Kenny Low No additional materials are required. READ THESE INSTRUCTIONS FIRST Write your name, class and index number on all the work you hand in. Write in dark blue and black pen. You may use a soft pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, 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. Enter the question numbers of the questions you have answered in Section B on the dotted lines in the grid below. 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 Section A Section B ……………….. ……………….. Total This document consists of 9 printed pages, inclusive of this page. [Turn over

2 YHSS/PRELIM/2022 Sec 4 Normal (A) Science (Physics) (Paper 2) Section A Answer all the questions in the spaces provided. 1 Some bricks are carried in a wheelbarrow, as shown in Fig. 1.1. Fig. 1.1 The combined mass of the wheelbarrow and bricks is 120 kg. (a) Calculate the combined weight of the wheelbarrow and bricks. Take g = 10 N/kg. combined weight of wheelbarrow and bricks = ………………………. [2] (b) The line of action of the combined weight of the wheelbarrow and the bricks acts at a perpendicular distance of 0.80 m from the pivot of the wheelbarrow. A vertical force F is applied at the handle, a distance of 0.50 m from the line of action of the combined weight, as shown in Fig. 1.1. Calculate the force F needed at the handle to hold the wheelbarrow and bricks in the position shown in Fig. 1.1. force F needed = ……………………… [2] Total: [4]

3 YHSS/PRELIM/2022 Sec 4 Normal (A) Science (Physics) (Paper 2) [Turn Over 2 An X-ray machine can be used to obtain pictures of the bones in our bodies without surgery. The wavelength of the X-rays used are 0.1 nm. (a) State the speed of X-rays in vacuum. ……………………………………………………………………………………………………… [1] (b) Calculate the frequency of the X-rays that are used. frequency of X-rays used = ……………………… [2] (c) Gamma rays are another type of electromagnetic radiation. State how the frequency, wavelength and spee