DHS 2019 JC1 MYE Physics

Name: Index Number: Class: DUNMAN HIGH SCHOOL Mid Year Examination Year 5 H2 PHYSICS Multiple Choice and Structured Questions Additional Materials: Multiple Choice Answer Sheet 9749 9 July 2019 2 hours READ THESE INSTRUCTIONS FIRST Write your class, index number and name 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. The use of an approved scientific calculator is expected, where appropriate. Section A There are fifteen 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 soft pencil on the separate Answer Sheet. Section B Answer all questions. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Section A MCQ 15 Section B 1 10 2 10 3 16 4 10 5 5 6 9 s.f. -1 Total 75 This document consists of 20 printed pages and 0 blank page.

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4 Section A Answer all the questions. You are advised not to spend more than 30 minutes on Section A. 1. Which estimate is realistic? A The mean kinetic energy of a typical saloon car traveling on an expressway in Singapore is 300 kJ. B The density of a tennis ball is 30 g cm−3. C The power of a hair dryer is 10 kW. D The pressure of air in a car tyre is 2 ×103 Pa. 2. Students A, B, C and D, each made a series of measurements of the acceleration of free fall, g. The table shows the results obtained. Which student obtained a set of results that could be described as precise but not accurate? Student Results, g / m s−2 A 9.79 9.83 9.84 9.81 B 8.46 8.45 8.41 8.50 C 8.76 9.45 9.21 8.99 D 9.81 10.12 8.94 9.89 3 An aeroplane travels at an average speed of 600 km h−1 on an outward flight and at 400 km h−1 on the return flight over the same distance. What is the average speed of the whole flight? A 111 m s−1 B 167 m s−1 C 480 km h−1 D 500 km h−1

5 4 A man standing at the top of a building releases a stone from rest. One second later, he throws a marble vertically downward with an initial velocity. Which of the following graphs best represents the velocity-time graphs for the stone (S) and the marble (M)? Ignore the effects of air resistance. 5 Two masses make an elastic collision. What are their speeds after the collision? 2.0 kg mass 6.0 kg mass A 2.0 m s−1 4.0 m s−1 B 4.0 m s−1 6.0 m s−1 C 5.0 m s−1 3.0 m s−1 D 7.0 m s−1 1.0 m s−1 5.0 m s−1 3.0 m s−1 2.0 kg 6.0 kg

6 6 A man is standing on a weighing scale in a lift. Which of the following statements is always true? A When the lift is moving down, the reading on the weighing scale i