CAT HIGH 2025 PHY PRELIM P1 QP

Name: Index Number: Class: CATHOLIC HIGH SCHOOL Preliminary Examination Secondary 4 (O-Level Programme) PHYSICS 6091/01 Paper 1 Multiple Choice 3 September 2025 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use paper clips, glue or correction fluid. Write your name, index number and class on this paper and 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. For examiner’s use only: Total / 40 Overall Marks % Paper 1 40 30% Paper 2A 70 50% Paper 2B 10 Paper 3 40 20% This document consists of 16 printed pages.

2 1 A student wishes to measure directly the circumference of a football. Which is the most suitable instrument to use? A a digital caliper B a measuring tape C a micrometer D a ruler 2 Which vector diagram correctly shows the force Z as the resultant of forces X and Y? 3 An object is dropped from a great height so that air resistance becomes significant. Which graph shows how its acceleration varies with time?

3 4 A speed-time graph for the journey of a car is shown. What is the distance-time graph for the journey? 5 A train is travelling horizontally in a straight line. A book is on a table in the train. The diagram shows all the forces acting on the book. How is the train moving? A accelerating to the left of the diagram. B accelerating to the right of the diagram. C moving at uniform speed to the left of the diagram. D moving at uniform speed to the right of the diagram.

4 6 A parachutist jumps off a plane. After 1.0 min, he opens the parachute and his velocity decreases at a decreasing rate. The following statements are possible explanations why the velocity of the parachutist decreases at a decreasing rate. (I) As the velocity decreases, the air resistance acting on the parachute decreases. (II) The air resistance is larger than the weight of the parachutist. (III) The force of the parachute acting on the air increases. Which of the above statements are correct explanations? A (I) only B (I) and (II) only C (II) only D (III) only 7 A thin, irregularly shaped metal plate is freely suspended from a point P and is in equilbrium, as shown. Point Q is vertically below P. Where is the centre of gravity of the plate located? A It is at P. B It is at Q. C It is exactly halfway between P and Q. D Further investigation is needed to determine its position.

5 8 The diagram below shows a wine bottle placed in a wooden holder. The bottle and the holder are in equilibrium. Which of the following statements is true? A The centre of gravity of the bottle is directly above the base of the wooden holder. B The centre of gravity of the bottle and the centre of gravity of the wooden holder are at the same point. C The centre of gravity of the wooden holder is directly above the base of the wooden holder. D The combined centre of gravity of the bottle and the wooden holder is directly above the base of the wooden holder. 9 Two identical fish tanks are filled with water to the same level. One tank contains fresh water. The other tank contains sea water. Sea water is more dense than fresh water. Which fish experiences the greatest pressure?

6 10 A water manometer is connected to a gas supply. The diagram shows the water levels. The water is replaced by mercury, which is more dense than water. Which diagram shows the mercury levels when the manometer is connected to the same gas supply? A B C D 11 Work is done when a force of 400 N pulls a crate of weight 500 N at a constant speed along a ramp, as shown. Part of the work done increases the gravitational potential energy E of the crate and the rest is work done W against friction. What are the values of E and W? E / J W / J A 1500 500 B 1500 2000 C 2000 2500 D 3500 500

7 12 A student calculates his power in running up a flight of stairs. He measures the vertical height of the stairs, the time taken to run up the stairs and his weight. How does he calculate his power? A height × time × weight B (height × weight) / time C (time × weight) / height D weight / (height x time) 13 A student observes the Brownian motion of smoke particles in air with a microscope. He sees moving points of light. Where do these points of light come from? A air particles only moving randomly B air particles only vibrating C smoke particles only moving randomly D smoke particles only vibrating 14 The diagram represents particles of a gas inside a closed container of constant volume. The gas is heated. What happens to the particles of the gas? A They expand. B They get closer together. C They hit the container walls with less force. D They move faster. 15 A cold solid is placed on top of a hot solid. Heat is transferred from the hot solid to the cold one. What is the explanation for this? A A hot solid expands, so its particles will move further apart. B Energy is transferred from one particle to the next. C Heat always rises. D Molecules are free to move randomly through the solids.

8 16 Some hot water is sealed inside a metal can. The can is in a vacuum in outer space. The hot water slowly cools down. How does the heat escape into space? A conduction then convection B conduction then radiation C evaporation then convection D evaporation then radiation 17 A vapour in a container is at a high temperature and loses heat to its surroundings. The graph shows how its temperature changes over the next few minutes. Which feature of the graph indicates that the specific latent heat of vaporisation of the substance is greater than its specific latent heat of fusion? A The gradient of the graph at P is greater than the gradient at R. B The gradient of the graph at T is greater than the gradient at R. C The length of the line Q is greater than the length of the line S. D The value of X is greater than the value of Y. 18 Equal masses of copper and water are heated to the same temperature. As they cool down, the copper and the water lose heat at the same rate. The temperature of the copper falls faster. Why is this? A Copper has a larger specific heat capacity. B Copper has a larger specific latent heat. C Copper has a smaller specific heat capacity. D Copper has a smaller specific latent heat.

9 19 The figure below shows straight parallel water waves travelling from the deep region to the shallow region in a ripple tank. Which one of the following diagrams shows correctly the waves in the shallow region? 20 The diagram represents a sound wave, where the x-axis represents time. The sound wave changes from X to Y. Which statement about the sound wave is correct? A The amplitude of the wave is increasing. B The frequency of the wave is decreasing. C The loudness of the sound is decreasing. D