Bedok South 2024 Sec 4XP PHY PRELIMS P1

[Turn over BEDOK SOUTH SECONDARY SCHOOL PRELIMINARY EXAMINATION 2024 4EXP CANDIDATE NAME CLASS REGISTER NUMBER PHYSICS Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 6091/01 27 August 2024 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil, Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class, register number 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. Setter: Ms Toh QM For Examiner’s Use Marks 40 This document consists of 21 printed pages.

2 1 What is the unit of force expressed in base units? A (kg m2) / s2 B (kg m) / s2 C (kg s2) / m D kg m s2 2 Two identical objects begin to fall from rest. One object falls from 200 m above the Earth’s surface and the other falls from 200 m above the Moon’s surface. There is no atmosphere on the Moon and the weight of each object is constant. Which row describes the motion of both objects one second after they started falling? acceleration of object falling above the Earth’s surface acceleration of object falling above the Moon’s surface A decreasing constant B constant constant C increasing decreasing D increasing increasing 3 At a lift off, the mass of a rocket is 2.5 × 10 6 kg. The rocket engines produce a thrust of 2.9 × 107 N. The gravitational field strength g is 10 N / kg. What is the initial acceleration of the rocket? A 0.086 m / s2 B 1.6 m / s2 C 12 m / s2 D 21 m / s2

3 [Turn over 4 When there is no wind, the engines of an airship push it due north at 20 m / s. The wind is blowing from the west at 12 m / s. Which vector diagram correctly shows how the resultant velocity R of the airship is obtained? A B C D

4 5 A student kicks a ball horizontally along the ground. As he does so, his foot applies a force to the ball. At the same time, the ball applies a force to his foot. How do these forces compare? A The force on the foot is equal to the force on the ball but in the opposite direction. B The force on the foot is equal to the force on the ball and in the same direction. C The force on the foot is smaller than the force on the ball and in the opposite direction. D The force on the foot is smaller than the force on the ball but in the same direction. 6 The diagram represents the Moon in its orbit round the Earth. Which arrow represents the direction of the resultant force acting on the Moon at the instant shown?

5 [Turn over 7 The diagram shows a block being pulled up a ramp by a rope. The block has weight W and the rope is pulled with force F. The block moves distance PR and is raised through height QR. What is the equation for the work done on the block by the rope? A weight W × distance PQ B weight W × distance PR C force F × distance PR D force F × height QR 8 A child has a set of wooden 3-dimensional capital letters. Which letter, H, I, R or Y, is the most stable when standing upright on a table?

6 9 Two cylinders P and Q are made of copper. The height of P is twice the height of Q. The diameter of P is half the diameter of Q. Which statement is correct? A The density of cylinder P is four times that of cylinder Q. B The density of cylinder P is twice that of cylinder Q. C The density of cylinder P is equal to that of cylinder Q. D The density of cylinder P is half that of cylinder Q. 10 An underwater diver moves from the ocean to a freshwater lake. The density of water in the lake is less than the density of water in the ocean. In which position does the diver experience the smallest pressure due to the water?

7 [Turn over 11 The diagram shows a simple manometer. Arm X is connected to a gas supply. Arm Y is open to the atmosphere. What pressure is the length h used to measure? A the atmospheric pressure S B the gas pressure R C the sum of the gas pressure R and the atmospheric pressure S D the difference between the gas pressure R and the atmospheric pressure 12 Which uses a non-renewable energy source? A a wind turbine B a solar panel C a nuclear power station D a geothermal heating system

8 13 The diagram shows the inside of a refrigerator. When the refrigerator is first switched on, what happens to the molecules and density of the air near the cooling unit? molecules of the air density of the air A become smaller decreases B become smaller increases C move closer together decreases D move closer together increases 14 A student needs a double-walled glass vessel to contain a hot liquid. What reduces heat losses by radiation? A a vacuum in the space between the walls B painting surface Q black C painting surface R black D painting surface S silver

9 [Turn over 15 On a hot day, a drink in a bottle can be kept cool by standing it in a bowl of water and placing a wet cloth over it. Why is the drink kept cool? A Hot air cannot escape from the bottle. B The cloth conducts heat from the bottle into the water. C The drink cannot evaporate from the bottle. D Water evaporating from the cloth cools the drink. 16 What is the definition of the amplitude of a wave? A the distance between the extreme points of a particle’s motion B the maximum distance a particle moves from its equilibrium position C the maximum energy carried by the wave D the maximum power of the vibrations carrying the wave 17 An echo sounder produces ultrasound of frequency 24 kHz. The ultrasound travels in water at a speed of 1.5 km / s. What is the wavelength of this ultrasound in water? A 0.063 m B 16 m C 36 m D 63 m

10 18 A sound wave travels through air. The lines in the diagram show the positions of particles of air at one particular time. Which distance is the wavelength of the wave? 19 A student stands a distance x in front of a large wall. He claps his hands at a regular rate so that each clap coincides with the echo from the previous clap. In a time t, he claps his hands N times. Which expression is used to calculate the speed of sound in air? A 𝑥 𝑁𝑡 B 2𝑥 𝑁𝑡 C 𝑁𝑥 𝑡 D 2𝑁𝑥 𝑡 20 Light is incident on a mirror and is reflected as shown. What is the angle of incidence and angle of reflection? angle of incidence angle of reflection A 40° 40° B 40° 50° C 50° 40° D 50° 50°