RI Year 3 Physics MYCT 2017

NAME: CLASS: NO: RAFFLES INSTITUTION 2017 MID-YEAR COMMON TEST Subject Level Date Time PHYSICS YEAR 3 5 May 2017 (Friday) 0800– 0930 (1 h 30 min) INSTRUCTIONS 1. Do not turn over the page until you are told to do so. 2. Write your name, class and index number in the spaces at the top of this page. 3. Read all instructions and questions carefuly. 4. This paper consists of two sections. • Section A Answer all questions. Shade your answers in pencil on the separate OMR Sheet. Section B Answer all questions. Write your answers in the spaces provided. Use a blue or black pen. Question marked with an * is optional. Marks earned for this question will be credited as bonus marks. 5. All workings must be shown. 6. The marks shown indicate the relative credit intended for each part of a question. I. Candidates are reminded that all quantitative answers should include appropriate units and should be given to a sensible number of signi fi cant fi gures. Errors in units and numbers of signi fi cant fi gures will be penalized. SECTION A CONSISTS OF 8 PRINTED PAGES, EXCLUDING THE COVER PAGE. 265

1 rec aguired, you may assume that the gravitational acceleration or fi eld strength g ioWhere he 9.81 N kg. earth's surface is 9.81 m s² or Section A 18 marks] FOur possible ppropriate answe answers A, B, C and D are aiven for each question. Choose the mo nost mriate answer and shade your answers in pencil on the OMR answer sheet provided. .ornier caliper is being used to measure the thickness of a book. 5 6 cm 5 10 What is the reading of the vernier caliper? A 0.495 cm B 0.515 cm C 4.95 cm D 5.15 cm Certain phrases are used to describe errors in experimental measurements. X: Cannot be eliminated Y: Have a constant sign and magnitude Z: Cannot be reduced by averaging repeated measurements Which phrase/s describe random errors? A B C D only only X and Z Yand Z 267

2 3 Ihe following show markings made by arrows aimed at the bull's eye. Which shows results of high precision but low accuracy? (O ((O) A B C D 4 The fi gure below shows the speed-time graph for a car. v/m s1 10.0 8.0 4.0 3.0 5.0 tls What is the average speed of the car? A B C D 2.00 m s1 6.60 m s 7.33 m s1 8.00 m s1 268

3 nraph below shows the displacement-time graph of an object. The 5 sIm 4 X Y tls Which of the following section(s) shows the object accelerating? A B C D only X and Y only Y and Z only X, Y and Z A block of wood slides along a smooth horizontal surface with an initial velocity of 1.50 m s1 to the right. A gust of wind blowing horizontally towards the left slows the block down and reverses its direction of motion. After 10.0 s, the block achieves a fi nal velocity of 4.00 m s to the left. (Assume that the block experiences uniform acceleration throughout the motion.) 6 What is the change in displacement of the block in that period of 10.0 s? A B C D - 27.5 m 12.5 m 0.550 m 27.5 m 269

4 An Olympic diver jumps upwards from a tall diving platform. His trajectory is tracec diagram below. 7 Which of t