CHS 2022 - Sec 4 PHYSICS Prelim Exam Paper 1

Name: Index Number: Class: CATHOLIC HIGH SCHOOL Preliminary Examination Secondary 4 (O-Level Programme) PHYSICS 6091/01 Paper 1 Multiple Choice 15 September 2022 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 50 50% Paper 2B 30 Paper 3 40 20% This document consists of 16 printed pages.

2 1 The diagram shows a wooden cube being measured using vernier calipers. What is the width of the wooden cube? A 1.6 mm B 2.6 mm C 2.8 mm D 8.0 mm 2 Micrometers, metre rules, tapes and vernier calipers are used for measuring lengths. Which row identifies the most suitable device to measure the stated length accurately? length measuring device A 0.15 mm micrometer B 0.50 mm metre rule C 0.50 mm vernier calipers D 0.15 m tape wooden cube 5 mm 10 mm

3 3 The graph below shows how the velocity of a car changes with time. Which of the following can be deduced from the graph? A The car accelerates, then moves with a constant velocity. B The car accelerates, then comes to a rest. C The car decelerates, then moves with a constant velocity. D The car decelerates, then stops moving. 4 A satellite is orbiting around the Earth. Which statement is correct? A There is a force on the satellite away from the Earth. B There is a force on the satellite in the direction in which it travels. C There is a force on the satellite opposite to the direction in which it travels. D There is a force on the satellite towards the Earth. 5 Two blocks are joined together. One block has a density of 6.0 g / cm3 and the other has a density of 9.0 g / cm3. What is the overall density of the two blocks joined together? A 7.0 g / cm3 B 7.5 g / cm3 C 8.0 g / cm3 D 15 g / cm3 velocity time

4 6 A ball was thrown upwards near the surface of the Earth with a velocity of 50 m / s. After 5 seconds, it came to a rest. The same ball was thrown up with the same velocity near the surface of planet X. After 5 seconds, it was still moving upwards with a velocity of 30 m / s. What was the ratio of the gravitational field strength near the surface of planet X to the gravitational field strength near the surface of the Earth? (The gravitational field strength g on Earth is 10 N / kg.) A 0.40 B 0.60 C 1.7 D 2.5 7 Why is it better to use a long spanner rather than a short one to tighten a screw? A Less force is needed. B Less friction is present. C Less turning effect is needed. D Less work is needed. 8 A boy who weighs 500 N stands on a uniform plank with supports at P and Q. The weight of the plank is 100 N and the distances between the boy and the supports are shown in the diagram below. What are the upward forces acting on the plank at P and Q? P Q A 267 N 333 N B 272 N 328 N C 294 N 306 N D 300 N 300 N 0.2 m 2.0 m 1.6 m 0.2 m P Q

5 9 When a student tries to touch his toes while standing flat against a wall, the student will probably fall over. Why of the following statements explains this? A The student’s centre of gravity is located directly above his support area. B The student’s centre of gravity is located outside his support area. C The student’s overturning moment is larger than the moment due to his own weight. D The student’s weight is too low. 10 The diagram below shows a simple mercury barometer placed in a science laboratory. The space above the mercury column contains air. Which of the following shows the distance that is used in determining atmospheric pressure? A AB B AC C BC D BD A B C D

6 11 The diagram shows two pieces of apparatus, with similar cross-sectional areas. One is filled with water and the other is filled with mercury. Water is much less dense than mercury. At which point is the liquid pressure greatest? 12 What type of energy may be released when atoms are re-arranged? A chemical potential energy B geothermal energy C nuclear energy D wind energy 13 A gas trapped in a cylinder is compressed at constant temperature by a piston. Which of the following will not change? A density B mass C molecular spacing D pressure 14 A glass jug is designed so that it does not break when boiling water is poured into it. What type of glass should be used? thickness expansion A thick expands greatly when heated B thick expands little when heated C thin expands greatly when heated D thin expands little when heated A D B C water mercury

7 15 In countries with cold weathers, houses can reduce heat loss through the roofs by having a layer of fibre glass on the floor of each roof. This layer of fibre glass consists of a very large number of very small glass fibres, which are laid over each other. Why is this layer of fibre glass effective as a heat insulator? A Glass fibres are good reflectors of radiation. B Glass fibres have a low heat capacity. C Glass fibres prevent the faster-moving air molecules from escaping. D Glass fibres reduce air movement and air is a good insulator of heat. 16 Why is mercury suitable to use as the liquid in many thermometers? A It can be seen easily. B It expands evenly with a rise in temperature. C It freezes at a high temperature. D It has a high density. 17 - As the temperature is raised, the molecules gain energy and vibrate more vigorously about their fixed positions. - Eventually they have enough energy to overcome the strong forces between them so they can move past each other, although the weaker forces still do not allow them complete freedom of movement. - During the entire process, the internal energy of the molecules increases. Which of the following describes the above entire process? A a liquid boiling to become a gas B a solid melting to become a liquid C a solid melting to become a liquid, then boiling to become a gas D a solid undergoing sublimation 18 An electric kettle with a power rating of 300 W requires 15 min to heat up 1 kg of water from 25 °C to 60 °C. Given that the specific heat capacity of water is 4200 J / (kg K), what is the amount of energy that is wasted? A 4 500 J B 123 000 J C 147 000 J D 270 000 J

8 19 On a hot day, t