Bedok South 2024 Sec 4XP PHY PRELIMS P1

[Turn over BEDOK SOUTH SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 4EXP CANDIDATE NAME CLASS REGISTER NUMBER PHYSICS Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 6091/01 27 August 2024 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil, Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class, register number on the Answer Sheet in the spaces provided. There are forty questions on 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 separate answer sheet. 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 booklet. The use of an approved scientific calculator is expected, where appropriate. Setter: Ms Toh QM For Examiner’s Use Marks 40 This document consists of 21 printed pages.

2 1 What is the unit of force expressed in base units? A (kg m2) / s2 B (kg m) / s2 C (kg s2) / m D kg m s2 2 Two identical objects begin to fall from rest. One object falls from 200 m above the Earth’s surface and the other falls from 200 m above the Moon’s surface. There is no atmosphere on the Moon and the weight of each object is constant. Which row describes the motion of both objects one second after they started falling? acceleration of object falling above the Earth’s surface acceleration of object falling above the Moon’s surface A decreasing constant B constant constant C increasing decreasing D increasing increasing 3 At a lift off, the mass of a rocket is 2.5 × 10 6 kg. The rocket engines produce a thrust of 2.9 × 107 N. The gravitational field strength g is 10 N / kg. What is the initial acceleration of the rocket? A 0.086 m / s2 B 1.6 m / s2 C 12 m / s2 D 21 m / s2

3 [Turn over 4 When there is no wind, the engines of an airship push it due north at 20 m / s. The wind is blowing from the west at 12 m / s. Which vector diagram correctly shows how the resultant velocity R of the airship is obtained? A B C D

4 5 A student kicks a ball horizontally along the ground. As he does so, his foot applies a force to the ball. At the same time, the ball applies a force to his foot. How do these forces compare? A The force on the foot is equal to the force on the ball but in the opposite direction. B The force on the foot is equal to the force on the ball and in the same direction. C The force on the foot is smaller than the force on the ball and in the opposite direction. D The force on the foot is smaller than the force on the ball but in the same directio