2024 JPJC H2 Prelim P1 - Printed

[Turn over Data Data READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and index number on the Answer Sheet in the spaces provided. There are thirty 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. This document consists of 16 printed pages. JURONG PIONEER JUNIOR COLLEGE JC2 Preliminary Examination 2024 PHYSICS 9749/01 Higher 2 17 September 2024 Paper 1 Multiple Choice 1 hour Additional Material: Multiple Choice Answer Sheet

2 2024/JPJC/Prelim/9749/01 Data speed of light in free space 81000.3 =c m s–1 permeability of free space 7 0 104 −=  H m–1 permittivity of free space 12 0 1085.8 −= F m–1 ( )( ) 910361 −=  F m–1 elementary charge 191060.1 −=e C the Planck constant 341063.6 −=h J s unified atomic mass constant 271066.1 −=u kg rest mass of electron 311011.9 −=em kg rest mass of proton 271067.1 −=pm kg molar gas constant 31.8=R J K–1 mol–1 the Avogadro constant 231002.6 =AN mol–1 the Boltzmann constant 231038.1 −=k J K–1 gravitational constant 111067.6 −=G N m2 kg–2 acceleration of free fall 81.9=g m s–2

3 2024/JPJC/Prelim/9749/01 [Turn over Formulae uniformly accelerated motion 2 2 1 atuts += asuv 222 += work done on/by a gas VpW = hydrostatic pressure ghp = gravitational potential Gm r =− temperature / K / C 273.15TT =  + pressure of an ideal gas 21 3 Nmpc V= mean translational kinetic energy of an ideal gas molecule 3 2E k T= displacement of particle in s.h.m. txx sin0= velocity of particle in s.h.m. tvv cos0= ( ) 22 0xx= − electric current Anvq=I resistors in series ...21 ++= RRR resistors in parallel .../1/1/1 21 ++= RRR electric potential r QV 04= alternating current/voltage txx sin0= magnetic flux density due to a long straight wire 0 2B d  = I magnetic flux density due to a flat circular coil 0 2 NB r = I magnetic flux density due to a long solenoid 0Bn = I radioactive decay )exp(0 txx −= decay constant 1 2 ln2 t =

4 2024/JPJC/Prelim/9749/01 1 What is a reasonable estimate of the cross-sectional area of the wire in a paper clip? A − 321 10 m B − 528 10 m C − 728 10 m D − 921 10 m 2 A photographer wishes to check the time for which the shutter on a camera stays open when a photograph is being taken. It is found that before the shutter opens, the ball falls 2.5 m from rest. During the time that the shutter remains open, the ball falls a further 0.12 m. What is the time that the shutter remains open? A 0.017 s B 0.16 s C 0.71 s D 0.73 s 3 A mass initially at rest exploded into two pieces of mass m1 and m2 which moves apart from each other with speeds v1 and v2 respectively. What is the ratio of 1 2 v v ? A B 1 2 m m C 2 1 m m D 2 1 m m 1 2 m m

5 2024/JPJC/Prelim/9749/01 [Turn over 4 A system of three coplanar forces is acting at a point. Which system of forces is most likely to be in equilibrium? A B C D 5 A skier of mass 60 kg skies down a slope from rest and reaches the bottom with a speed of 20 m s −1. The vertical height of the slope is 50 m and the effective distance the skier moves along the slope is 200 m. What is the average frictional force acting on his ski if he skies down the slope under the influence of gravity only? A 87 N B 150 N C 240 N D 2100 N

6 2024/JPJC/Prelim/9749/01 6 A block is resting on a weighing scale in a car. When the car is moving with constant velocity, the weighing scale gives a reading of W in newtons. When the car drives over a hump of radius r, the weighing scale reads 3 W at the highest point of the hump. What is the velocity of the car at this point? A 3 gr B 2 3 gr C gr D 4 3 gr 7 A planet has a mass M and a radius R. An object at the equator only just remains in contact with the surface of the planet. This is because the speed at which the planet rotates is very large. What is the period of rotation of the planet? A  2 2 R GM B  22 GM R C  3 2 R GM D  32 GM R

7 2024/JPJC/Prelim/9749/01 [Turn over 8 A particle undergoes simple harmonic motion with period T. The variation with time of its acceleration is shown below. What is the particle’s displacement, in terms of its amplitude xo, at time ?3 T A –0.87xo B –0.50xo C 0.50xo D 0.87xo 9 In deriving the equation 21 3p c= in kinetic theory of gases, which of the following is not taken as a valid assumption? A Attractive forces between the molecules are negligible. B The duration of a collision is negligible compared with the time between collisions. C Collisions with the walls of the container and with other molecules cause no change in the average kinetic energy of the molecules. D The molecules suffer negligible change in momentum on collision with the walls of the container. 10 Why does the pressure of a fixed mass of gas at constant volume increase with temperature? A The molecules collide with the container walls more frequently. B The number of intermolecular collisions increases. C The molecules travel greater distances between collisions with one another. D The energy transferred to the walls during collisions increases. acceleration, a time, t ao −ao T 2T

8 2024/JPJC/Prelim/9749/01 11 A metal pellet of mass m and specific heat capacity c hits a steel plate at speed v. During the impact, the kinetic energy is reduced to 25% of its original value. The loss in kinetic energy of the pellet is converted to thermal energy in the pellet. What is the rise in temperature of the pellet? A 2 8 v c B 23 8 v c C 2 8 mv c D 23 8 mv c 12 Water waves of wavelength 10 m approach a wall at an angle of 30° as shown. What is the phase difference between water waves at two points 5.0 m apart along the wall? A 0.79 rad B 0.96 rad C 1.6 rad D 3.1 rad water wavefronts 10 m wall 30°

9 2024/JPJC/Prelim/9749/01 [Turn over 13 Vertical plane-polarised radio-waves of amplitude A is transmitted towards a receiving antenna. The antenna is tilted at an angle θ from the vertical in the plane perpendicular to the direction of propagation of the radio-waves. Which of the following is the power received by the antenna proportional to? A 22cosA  B cosA  C sinA  D zero 14 Two identical narrow slits S1 and S2 are illuminated by light of wavelength  from a point source P as shown. The light through the slits is then captured on a screen. Given that m is a positive in