Sec_4_Physics_SA2_2018_Ahmad_Ibrahim

AHMAD IBRAHIM SECONDARY SCHOOL GCE O-LEVEL PRELIMINARY EXAMINATION 2018 PHYSICS PAPER 1 6091/01 Sec 4 Express Date: 16 August 2018 Duration: 1 hour Name: ………………………………………( ) Class: …………… READ THESE INSTRUCTIONS FIRST: Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class number and registration number on the optical answer sheet (OAS) provided. There are forty questions in this paper. 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 optical answer sheet (OAS) provided. Read the instructions on the answer sheet very carefully. 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 question paper. The use of an approved scientific calculator is expected, where appropriate. This question paper consists of 20 printed pages 3

2 1 Pendulum A makes 20 complete oscillations in 10 s. Pendulum B makes 15 complete oscillations in 15 s. Both pendulums were displaced by a small angle before their oscillations. Which of the following statements must be true? A Pendulum B has a shorter period than pendulum A. B The string of pendulum B is longer than that of pendulum A. C The mass of the bob of pendulum B is smaller than that of pendulum A. D The angle of swing of release for pendulum B is smaller than that of pendulum A. 2 A pair of vernier calipers is used to measure the thickness of a coin. Diagram 1 shows the reading with the jaws closed. Diagram 2 shows the reading when the jaws are closed around the coin. What is the zero error and the actual thickness of the coin? Zero error / cm Corrected reading / cm A -0.02 4.05 B -0.02 4.01 C +0.08 3.95 D +0.08 4.11 cm cm Diagram 1 Diagram 2 4

3 3 A student uses a micrometer screw gauge to measure the diameter of a ball bearing. Diagram 1 shows the zero error of the gauge and diagram 2 shows the measurement of the diameter before it is corrected. Diagram 1 Diagram 2 What is the true diameter of the ball bearing? A 7.19 mm B 7.69 mm C 7.72 mm D 7.75 mm 4 A sphere runs along a smooth rail from P to Q as shown. Which of the following graphs best represents the variation of the distance d travelled by the sphere with time t? 5

4 5 A bicycle accelerates from a speed of 2.0 m/s to 10 m/s in 8.0 s. What is its average speed during the journey? A 4.0 m/s B 5.0 m/s C 6.0 m/s D 7.0 m/s 6 The diagram shows the graph of displacement s against time t for a body moving in a straight line. Which of the following shows the graph of speed v against time t for this body? 7 Two metal blocks are stacked one on top of the other as shown i n the diagram below. They are dropped in vacuum, falling together freely under earth ’s gravitational field. What is the net force acting on the 3 kg metal block during the fall? A 10 N B 20 N C 30 N D