2023 CHS Phy Prelims P1

Name: Index Number: Class: CATHOLIC HIGH SCHOOL Preliminary Examination Secondary 4 (O-Level Programme) PHYSICS 6091/01 Paper 1 Multiple Choice 29 Aug 2023 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 18 printed pages.

2 1 Which pair of units are both SI base units? A ampere, degree Celsius B ampere, kelvin C coulomb, degree Celsius D coulomb, kelvin 2 A micrometer screw gauge is used to measure the diameter of an object. It has a zero error of -0.02 mm. What is the estimated diameter of the object? A 6.63 mm B 6.65 mm C 8.13 mm D 8.15 mm 3 An object accelerates uniformly from rest . The effects of friction and air resistance are negligible. The object travels a distance of 40 m in 4.0 s. What is the acceleration of the object? A 0.40 m / s2 B 2.5 m / s2 C 5.0 m / s2 D 20 m / s2

3 4 The graph shows how the acceleration of an object moving in a straight line varies with time. Which graph shows the variation with time of the velocity of the object? A B C D

4 5 A helium balloon is tied to a top -pan balance. A metal block of mass 100 g is placed on the balance. The reading on the balance is 91 g. Which statement can be deduced from the experiment? A The balloon has a weight of 0.91 N. B The balloon exerts a downward force of 0.09 N on the top-pan balance. C The resultant downward force on the top-pan balance is 0.91 N. D The top-pan balance measures the weight of the objects placed on it.

5 6 The diagram shows a sign of weight 20 N suspended from a pole, attached to a wall. The pole is kept in equilibrium by a wire attached at point X of the pole. The force exerted by the pole at point X is F, and the tension in the wire is 40 N. Which diagram represents the three forces acting at point X? A B C D 7 A 120 kg rock is vertically suspended from a support on the Moon. When an astronaut applies a horizontal force on the rock, which of the following is true about the rock? A It is easier to push than on Earth. B It is more difficult to push than on Earth. C It requires minimum effort of 1200N to push. D It requires the same effort to push as on Earth.

6 8 1.5 m3 of water is mixed with 0.50 m3 of alcohol. The density of water is 1000 kg / m3 and the density of alcohol is 800 kg / m3. What is the density of the mixture with volume 2.0 m3? A 850 kg / m3 B 900 kg / m3 C 940 kg / m3 D 950 kg / m3 9 An empty egg shell contains solidified wax as shown. In which position is the egg shell most stable when placed on a flat, horizontal surface? A B C D 10 A child drinks a liquid of density ρ through a vertical straw. Atmospheric pressure is p0 and the child is capable of lowering the pressure at the top of the straw by 10%. The gravitational field strength is g. What is the maximum length of straw that would enable the child to drink the liquid? A p0 10ρg B 9p0 10ρg C p0 ρg D 10p0 ρg

7 11 A mercury barometer is used to measure the atmospheric pressure at sea level as shown. The barometer is brought up to a mountain which has a lower atmospheric pressure compared to sea level. How will the pressure at point X and region P change after the barometer is brought up to the mountain? pressure at point X pressure at region P A decreases decreases B decreases remains unchanged C increases decreases D remains unchanged remains unchanged 12 The data below are taken from a test of a petrol engine for a motor car. power output 150 kW fuel consumption 20 litres per hour energy content of fuel 40 MJ per litre Which expression shows the calculation for the efficiency of the engine? A 150 × 103 × 60 × 60 20 × 40 × 106 B 150 × 103 40 × 106× 20 × 60 × 60 C 150 × 103 × 40 × 106 × 20 60 × 60 D 150 × 103 × 20 40 × 106× 60 × 60 13 Which statement about solids, liquids and gases is not correct? A Gases are less dense than liquids because the molecules in a gas are very far apart. B Liquids flow because the molecules in a liquid slide over each other. C Solids are rigid because the molecules in a solid vibrate. D Solids cannot be compressed because the molecules are close to each other in fixed positions. X P

8 14 In a Brownian motion experiment, bright specks of smoke particles are observed to move in constant, random zigzag motion. What is the reason for the motion of the bright specks of smoke particles? A The air particles collide unevenly against the smoke particles. B The convection currents of air caused the smoke particles to move. C The smoke particles are light. D The smoke particles gain energy from the light source. 15 The average kinetic energy of gas molecules in a closed, rigid container is increased. What happens to the pressure of the gas? A The pressure decrease s as the force and frequency of collision between the gas molecules and the container walls decrease. B The pressure decrease s as the force and frequency of collision between the gas molecules and the container walls increase. C The pressure increase s as the force and frequency of collision between the gas molecules and the container walls decrease. D The pressure increase s as the force and frequency of collision between the gas molecules and the container walls increase. 16 A cupboard is placed in front of a heater. Air can move through a gap under the cupboard. Which line in the table describes the temperature and the direction of the air that moves through the gap? air temperature air direction A cool away from the heater B cool towards the heater C warm away from the heater D warm towards the heater

9 17 Cooling fins are used in many devices such as refrigerators and car radiators. Which statement about their design is correct? A Their large surface area increases the rate of heat loss by conduction. B Their high specific heat capacity increases the rate of heat loss by conduction. C They are made of metal to increase the rate of heat loss by infra-red radiation. D They are painted white to increase the rate of heat loss by infra-red radiation. 18 A mercury thermometer with no scale is taped to a ruler as shown. When the thermometer is placed in steam, the mercury level rises to 22.0 cm. When the thermometer is placed in a liquid of temperature 30 °C, the mercury level falls to 8.0 cm. Which is the length of the mercury level when it is placed in another liquid of temperature 10 °C? A 2.2 cm B 2.7 cm C 4.0 cm D 18 cm 19 Which process does not require energy to be supplied? A boiling B evaporat