Bedok Green Prelim P1

2 © BGSS 2024 [Turn over 1 A pipe has an approximate length of 80 cm with an approximate external and internal diameter of 5 cm and 3 cm respectively. Which instruments are the most suitable for measuring accurately the length, external and internal diameters? length external diameter internal diameter A metre rule vernier calipers micrometer B tape metre rule digital calipers C metre rule vernier calipers digital calipers D tape micrometer digital calipers 2 A pendulum is set into motion. As it swings, the angle of oscillation gradually decreases to zero. Which of the following statements about energy at any point of the pendulum’s motion is correct? A The kinetic energy of the pendulum is constant. B The potential energy of the pendulum is constant. C The total energy of the pendulum and air is constant. D The sum of kinetic energy and potential energy of the pendulum is constant. 3 A ball bearing is released in a liquid. It sinks vertically downward until it reaches terminal velocity. Which describes the resultant force acting on the ball bearing during terminal velocity? A constant B decreasing C increasing D zero angle of oscillationangle of oscillation

3 © BGSS 2024 [Turn over 4 Two blocks M and m are connected by a light spring passing over a smooth pulley as shown. When block m is released, the blocks move with constant speed. After a while, the string is cut in between. Which of the following correctly describes the motion of the blocks immediately after the string is cut? M m A stops moving moves with constant speed B moves with constant speed accelerates C decelerates moves with constant speed D decelerates accelerates 5 A block is resting on a table. Two forces act on the block: its weight and the normal contact force. Which force will make an action-reaction pair with the weight of the block? A the force acting on the Earth by the block B the force acting on the table by the block C the force acting on the block by the table D the force acting on the block by the Earth M m

4 © BGSS 2024 [Turn over 6 When a horizontal force of 4.0 N is applied to a wooden block of mass 2.0 kg on a horizontal surface, the block moves with a constant velocity. What is the acceleration of the block if the horizontal force is increased to 12.0 N? A 2.0 m/s2 B 4.0 m/s2 C 6.0 m/s2 D 8.0 m/s2 7 In an experiment to determine the density of lead shots, the f