YTSS Prelim P1

NAME: ( ) CLASS: YISHUN TOWN SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 SEC 4 EXPRESS PHYSICS (6091/1) DATE : 27 August DAY : Tuesday DURATION: 1 hr MARKS: 40 marks ADDITIONAL MATERIALS Multiple Choice Answer Sheet (OMS) READ THESE INSTRUCTIONS FIRST Write your name, class and register number in the spaces provided at the top of this page. There are forty questions. 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. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. INFORMATION FOR CANDIDATES Any rough working should be done in this booklet. You may use an approved calculator. This question paper consists of 16 printed pages.

2 1 A student makes three statements.  A larger object will always have a larger inertia.  A smaller object will always have a smaller density.  When the mass of an object is kept constant, the gravitational force acting on it must also remain constant. How many statements are always true? A 0 B 1 C 2 D 3 2 A list of 8 physical quantities is shown below: Length Time Energy Force Speed Weight Mass Acceleration How many of them are derived units? A 3 B 4 C 5 D 6 3 What is the conversion factor for converting nanohertz (nHz) to gigahertz (GHz)? A 10 -9 B 10 -12 C 10 -15 D 10 -18

3 4 The figure (not drawn to scale) below shows a climber supported by a rope on a vertical wall. The weight and normal contact force are shown by the labelled arrows. Which vector diagram is correct? A B C D

4 5 The velocity – time graph of a body is shown below. Paul makes four statements about the motion of the body. 1. The body is accelerating in the negative direction. 2. The body is decelerating. 3. The acceleration of the body is decreasing. 4. The speed of the body is increasing. Which statements are correct? A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4 6 A ball is dropped downwards, hits the floor and rebounds upward. The figure below shows the instance of the ball just before and right after it hits the floor. Which row shows the correct description of the acceleration just before and after the ball hits the floor? just before hitting the floor just after hitting the floor A acceleration is 10 m/s2 downwards acceleration is 10 m/s2 upwards B acceleration is 0 m/s2 downwards acceleration is 0 m/s2 upwards C acceleration is 0 m/s2 downwards acceleration is 0 m/s2 downwards D acceleration is 10 m/s2 downwards acceleration is 10 m/s2 downwards

5 7 A momentary force is applied to a disc on a frictionless surface. The effect of air resistance is negligible. Which statement best describes the subsequent motion of the