2022 NCHS Phy Prelims P1

Name: Register Number: Class: NAN CHIAU HIGH SCHOOL PRELIMINARY EXAMINATION 2022 SECONDARY FOUR EXPRESS PHYSICS 6091/01 Paper 1 Multiple Choice 30 Aug 2022 Tuesday 1 hour Candidates answer on the OTAS. INSTRUCTIONS TO CANDIDATES Write your name, class and register number in the spaces provided at the top of this page. 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 OTAS. Each correct answer will score one mark. The total marks for this paper is 40. Take gravitational field strength of Earth = 10 N kg-1 and acceleration due to gravity = 10 m s-2. For Marker’s Use

2 This paper consists of 16 printed pages including the cover page. 1 What is the order of magnitude of the mass of a typical motor car (without driver and passengers) in kg? A 1 x 10 B 1 x 102 C 1 x 103 D 1 x 104 2 A micrometer screw gauge is used to measure the thickness of a coin. The diagrams show the scales of the micrometer when the jaws are closed with no coin and when the jaws are closed with the coin respectively. What is the thickness of the coin? A 3.35 mm B 3.39 mm C 3.85 mm D 3.89 mm 3 The diagram shows how the kinetic energy (KE) of the bob of an oscillating simple pendulum varies with time. What is the period of the pendulum in second? A 0.2 B 0.4 C 0.5 D 0.6 KE / mJ time / s mJ 0 0.2 0.4 0.6 10

3 4 An uniform flat piece of metal sheet has a density of 8.0 g/cm3. One quarter of the metal sheet is cut out as shown. What is the density of the one-quarter metal sheet? A 2.0 g/cm3 B 4.0 g/cm3 C 8.0 g/cm3 D 32.0 g/cm3 5 A car is moving in a straight line horizontally at a constant speed of 20 m/s. The car engine produces a constant power of 28,000 W. What is the frictional force acting on the car when the efficiency of the car engine is 71 %? A 990 N B 2000 N C 20 000 N D 400,000 N 6 A boy pushes a box 10 m along a rough, horizontal floor with a force of 5.0 N. The frictional force between the floor and the box is 2.0 N. What is the work done against the friction, the work done by the boy and the energy gained by the box? work done against friction/ J work done by boy/ J energy gained by box/ J A 20 50 30 B 20 50 50 C 30 50 50 D 30 50 30

4 7 The diagram shows two divers of different masses diving with the same initial speed from the same height into a pool. Air resistance is negligible. Which physical quantity is different between the divers just before they hit the water? A acceleration B duration of free fall C kinetic energy D speed 8 A parachutist has opened his parachute and is falling to Earth at constant speed. What is the principal energy conversion taking place as he falls? A gravitational potential energy to kinetic energy B gravitational potential energy to thermal energy C kinetic energy to gravitational potential energy D kinetic energy to thermal energy 9 Bubbles of gas rise from the bottom to the surface of a deep lake. As the bubbles rise, their volumes increase. Why is this so? A Atmospheric pressure on the bubbles decreases. B Atmospheric pressure on the bubbles increases. C Water pressure on the bubbles decreases. D Water pressure on the bubbles increases. 65 kg 80 kg surface bottom

5 10 The diagram shows a mercury manometer. Pressures of (P + 12) mmHg and P mmHg are exerted at the right and left tubes respectively. What will happen to the mercury level in the left tube when the pressure at the right tube decreases to (P + 6) mmHg? A increases by 3 mm B increases by 6 mm C decreases by 3 mm D decreases by 6 mm 11 Two solid cubes are made from the same material. One cube has sides that are two times as long as the other. When placed on one side, the small cube exerts a pressure p on the ground. What is the pressure exerted by the large cube standing on one of its faces? A 2p B 4p C 8p D 13p 12 A resistance thermometer has a resistance of 45.0 Ω at ice point and 295 Ω at steam point. What is its temperature when its resistance is 148 Ω? A 34.9 °C B 41.2 °C C 50.2 °C D 59.2 °C P mmHg (P + 12) mmHg l 2l

6 13 When dust particles in air are observed in a microscope, they move in a random, zig-zag motion. The same dust particles are observed to move faster in the same random, zig-zag motion when room temperature is higher. Why is it so? A The dust particles gain kinetic energy and collide with the air molecules more vigorously and frequently. B The air molecules gain kinetic energy and collide with the dust particles more vigorously and frequently. C The increased temperature of the room creates a convention current that causes the dust particles to move faster. D The increased temperature of the room causes chemical reactions to occur between the dust particles and air molecules. 14 A fixed mass of helium gas is compressed to a smaller volume at constant temperature. How do the following properties of the gas molecules change? average speed of the gas molecules frequency of collisions with the walls of the container A increases increases B increases remains unchanged C remains unchanged increases D remains unchanged remains unchanged 15 The graph indicates properties of a fixed mass of ideal gas. Which of the following could describe what is plotted on the graph? horizontal axis vertical axis condition A temperature pressure constant volume B temperature density constant pressure C temperature volume constant density D volume pressure constant temperature

7 16 The diagram shows a metal saucepan filled with water and placed on a hot plate. After some time, the air at point X also becomes hot. What are the main ways by which heat travels through the materials between the hot plate and point X? through base of the saucepan through the water through the air A Conduction Convection Radiation B Conduction Convection Convection C Radiation Convection Conduction D Radiation Conduction Convection 17 The figure below shows a heat sink placed on top of a central processing unit (CPU) chip in a computer. The heat sink is painted black and is designed to have many fins (layers with air spaces between them). Heat is conducted from the CPU to the heat sink. The heat sink then transfers the heat to the surroundings. Which statement about the heat sink is not correct? A The fins is made of aluminium because aluminium is a good conductor of heat. B The heat sink has many fins to increase the surface area for emission of radiant heat. C The heat sink is painted black because black surfaces are good conductors of heat. D The heat sink is painted black because black surfaces are good emitters of radiant heat. hot plate metal saucepan water X

8 18 Water in a beaker is heated from 10 oC to 100 oC. The water starts boiling at 100 oC. Which of the following is true for the internal potential energy (IPE) and the internal kinetic energy (IKE) of the water molecules during heating and boiling? heating from 10 oC to 100 oC boiling at 100 oC A IKE increases slightly IKE increases by a lot B IKE remains the same IKE remains the same C IPE increase slightly IPE increases by a lot D IPE remains the same IPE remains the same 19 The diagram shows a light ray travelling from medium Y, through the air, to medium Z. The refractive indices of media Y and Z are denoted by ny and nz respectively. Which relationship correctly describes the magnitude of ny and nz? A 1> nz > ny B nz > ny > 1 C ny > 1 > nz D ny > nz > 1 20 A small nail is viewed through a rectangular glass block with parallel faces. The nail is 8.0 cm away from the face A of the glass block. Which of the following describes how the image of the nail is seen by the observer? A real and less than 8.0 cm away from face A B real and more than 8.0 cm away from face A C virtual and less than 8.0 cm away from face A D virtual and more than 8.0 cm away from face A