2023 ACSBR Phy Prelims P1

Anglo-Chinese School (Barker Road) PRELIMINARY EXAMINATION 2023 SECONDARY FOUR EXPRESS PHYSICS 6091/01 (PAPER 1 Multiple Choice) TIME: 1 HOUR READ THESE INSTRUCTIONS FIRST Write your name and Exam Index number on the Answer Sheet in the spaces provided. Write in soft pencil. 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. 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. This question paper consists of 12 printed pages

Anglo-Chinese School (Barker Road) Preliminary Examination 2023 2 Secondary 4 Express Physics 6091/01 1 A micrometer is used to measure the diameter of a wire. The diagrams show th e micrometer when the jaws are closed and the micrometer when the wire is between the jaws. What is the diameter of the rod? A 4.42 mm B 6.61 mm C 6.67 mm D 7.11 mm 2 The diagram shows a simple pendulum. Using a stopwatch, which would be the most accurate way to measure the period of the pendulum? A Time the motion from X to Y and back to X. B Time the motion from X to Y and back to X again for 20 cycles and multiply by 20. C Time the motion from X to Y and back to X for 20 cycles and divide by 20. D Time the motion from X to Y and double it. 3 Green light has a wavelength of 550 nm. What is the wavelength of blue light? A 0.450 m B 0.650 m C 4.500 m D 6.500 m Micrometer when jaws are closed micrometer when wire is between the jaws 0 45 0 10 15 5 pendulum bob X Y

Anglo-Chinese School (Barker Road) Preliminary Examination 2023 3 Secondary 4 Express Physics 6091/01 4 What is the order of magnitude of the diameter of a human hair? A 10-8 m B 10-6 m C 10-4 m D 10-2 m 5 Which pair contains a vector and a scalar quantity? A area and displacement B distance and volume C temperature and pressure D weight and velocity 6 Two forces, 3 N and 7 N respectively, are acting on a small ball-bearing. Which is a possible resultant force acting on the ball-bearing? A 1 N B 3 N C 8 N D 11 N 7 Which quantity does not have a unit? A electric current B gravitational field strength C potential difference D refractive index 8 A 1000 kg mass was placed 2 m directly above a 1 kg mass and both were dropped from a tower at the same time. Assuming air resistance is negligible, Which statement is correct about the time of landing? A Not possible to predict. B The 1000 kg mass would land on the ground at same time as the 1 kg mass. C The 1000 kg mass would land on the ground faster than the 1 kg mass. D The 1000 kg mass would land on the ground later than the 1 kg mass.

Anglo-Chinese School (Barker Road) Preliminary Examination 2023 4 Secondary 4 Express Physics 6091/01 9 The diagram shows the displacement-time graph of a bicycle. When is the velocity of the bicycle 2.0 m/s? A 0 s to 5 s B 5 s to 7 s C 7 s to 10 s D 10 s to 13 s 10 A motorcycle of mass 800 kg accelerates at 2.0 m/s 2. The engine of the motorcycle exerts a driving force of 2500 N on it. What is the total resistive force acting on the motorcycle? A 900 N B 1600 N C 2100 N D 4100 N 11 When his parachute is fully opened, a parachutist falls towards the ground at constant speed. Under these conditions, which statement correctly identifies an action-reaction pair? A Downward force on parachute by air and the downward force on air by parachute. B Downward force on parachute by air and the weight of the parachutist. C Upward force on parachute by air and the weight of the parachutist. D Upward force on parachute by air and the downward force on air by parachute. displacement / m time / s 0 2 4 6 8 10 12 14 2 4 6 8 10

Anglo-Chinese School (Barker Road) Preliminary Examination 2023 5 Secondary 4 Express Physics 6091/01 12 The mass of a body resists changes to its motion. Which property of the body is responsible for this resistance? A inertia B gravitational potential energy C kinetic energy D temperature 13 A mountaineer of weight 700 N at the bottom of Mount Everest climbs to the top. The gravitational field strength changes from 9.81 N/kg at the bottom to 9.79 N/kg at the top. What are his mass and weight at the top of Mount Everest? mass at top of Mount Everest / kg weight at top of Mount Everest / N A 71.4 699 B 71.4 700 C 71.5 699 D 71.5 700 14 5000 kg of iron is melted and mixed with 2.0 m3 of molten copper. If the density of molten iron and molten copper are 7500 kg/m 3 and 9000 kg/m 3 respectively, what is the approximate density of the mixture? A 8.3 kg/m3 B 8.6 kg/m3 C 8300 kg/m3 D 8600 kg/m3 15 Which statement correctly defines gravitational field? A It is a region in which a mass experiences a gravitational force of attraction. B It is the amount of substance in a body. C It is the gravitational force per unit mass. D It is the gravitational potential energy stored in a body.

Anglo-Chinese School (Barker Road) Preliminary Examination 2023 6 Secondary 4 Express Physics 6091/01 16 In order to balance a non-uniform lamina on a knife edge as shown, a weight is suspended at point A. Where is the position of centre of gravity of this arrangement? 17 The following chairs, drawn to the same scale, are displayed in a furniture store. Which of these chairs is the most stable? 18 The diagram shows a barometer. The atmospheric pressure is 100 000 Pa. What is the pressure at the point marked ‘X’? A 25 000 Pa B 75 000 Pa C 100 000 Pa D 125 000 Pa A B C D knife edge weight lamina A B C D x 0.25 h vacuum h X

Anglo-Chinese School (Barker Road) Preliminary Examination 2023 7 Secondary 4 Express Physics 6091/01 19 The diagram shows a simple hydraulic jack. What change(s) should be made to the area of the pistons to lift a heavier load if the force applied at the handle remains unchanged? piston A piston B A doubled halved B doubled remains unchanged C halved doubled D remains unchanged halved 20 A washing machine has a power input of 2.5 kW. What is the work done in half an hour if the washing machine has an efficiency of 95%? A 71 kJ B 79 kJ C 4300 kJ D 4700 kJ 21 A bus moves from rest with uniform acceleration along a horizontal road. After travelling a distance of 100 m, it has 300 000 J of kinetic energy. What resultant force is acting on the car? A 100 N B 1000 N C 3000 N D 30 000 N 22 The temperature shown by a mercury-in-glass thermometer decrease. Which of the following is constant? A the density of the mercury B the internal energy of the mercury C the mass of the mercury D the volume of the mercury handle piston A piston B hydraulic fluid

Anglo-Chinese School (Barker Road) Preliminary Examination 2023 8 Secondary 4 Express Physics 6091/01 23 A sealed container of gas is heated. What happens to the molecules of the gas? A The average kinetic energy of the molecules increases and they hit the container more frequently. B The average kinetic energy of the molecules increases and they hit the container less frequently. C The molecules do not change size and the spaces between the molecules become smaller. D The molecules expand and the spaces between the molecules become smaller. 24 Brownian motion can be observed by the behaviour of smoke particles in a smoke cell