Catholic High 2022_Year 4 Physics_TA3_with ANSWERS (FINAL)

Name: ANSWERS Index Number: Class: CATHOLIC HIGH SCHOOL Term 3 Class Test Year 4 (Integrated Programme) PHYSICS Moments, Energy, Work and Power, Current of Electricity, DC Circuits, Practical Electricity, Magnetism, Electromagnetism, Electromagnetic Induction 11 Aug 2022 40 minutes READ THESE INSTRUCTIONS FIRST Write your name, index number and class on all the work that you hand in. Write in dark blue or black pen. Do not use paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. At the end of the examination, fasten all your work securely together. Section A: Multiple Choice There are ten questions in this section. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in the table provided at the end of this section. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. Section B: Structured You may use an HB pencil for any diagrams or graphs. Answer all questions. Candidates are reminded that all quantitative answers should include appropriate units. Candidates are advised to show all their workings in a clear and orderly manner, as more marks are awarded for sound use of Physics than for correct answers. The number of marks is given in brackets [ ] at the end of each question or part question. For examiner’s use only: Section A / 10 Section B / 25 formula s.f.   Total / 35 This document consists of 11 printed pages.

2 Section A Answer all the questions in this section. Record your choice in the table below. Answers for Section A 1 2 3 4 5 6 7 8 9 10 1 A student would like to conduct a plumb line experiment to determine the centre of gravity of a cardboard. Which of the following steps is not needed in determining the cardboard’s centre of gravity? A ensuring that the cardboard can oscillate freely. B hanging a plumb line from the pivot. C pivoting the cardboard near its centre of gravity. D tracing the plumb line on the cardboard. 2 The figure below shows a drop slide where the first part of the fall is vertical. A child of mass 30 kg uses the drop slide, slides down to C and then stops at D. The child is initially at rest at A. Assuming there is no friction acting on the child during his fall from A to C, what is the average frictional force acting on the child as he slides between C and D? A 37 N B 140 N C 370 N D 740 N 3 A power station provides 2.0 MW of total power and produces 900 kW of wasted energy in its operations. What is the useful electrical energy produced by t he power station in two hours? A 1.8 MWh B 2.2 MWh C 132 MWh D 7920 MWh

3 4 A wire has a resistance of 10 Ω. A second wire, made of the same m