ASRJC Prelim H2P1 (9749) final

1 9749/01/ASRJC/2023Prelim [Turn over Name: _____________________________ ( ) Class: 23 / ______ 2023 JC2 Preliminary Examination PHYSICS Higher 2 9749/01 Paper 1 Multiple Choice Wednesday 20 September 2023 1 hour Additional Materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid. Write your name and class on the Multiple Choice Answer Sheet. Shade and write your NRIC/FIN. 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 Multiple Choice Answer Sheet. Read the instructions on the Multiple Choice 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 question paper. The use of an approved scientific calculator is expected, where appropriate. This document consists of 18 printed pages and 2 blank pages. ANDERSON SERANGOON JUNIOR COLLEGE

9749/01/ASRJC/2023Prelim Data speed of light in free space c = 3.00  108 m s−1 permeability of free space 0 = 4  10−7 H m−1 permittivity of free space 0 = 8.85  10−12 F m−1 (1/(36))  10−9 F m−1 elementary charge e = 1.60  10−19 C the Planck constant h = 6.63  10−34 J s unified atomic mass constant u = 1.66  10−27 kg rest mass of electron me = 9.11  10−31 kg rest mass of proton mp = 1.67  10−27 kg molar gas constant R = 8.31 J K−1 mol−1 the Avogadro constant NA = 6.02  1023 mol−1 the Boltzmann constant k = 1.38  10−23 J K−1 gravitational constant G = 6.67  10−11 N m2 kg−2 acceleration of free fall g = 9.81 m s−2 2

3 9749/01/ASRJC/2023Prelim [Turn over Formulae uniformly accelerated motion =s 2 2 1 atut + =2v asu 22 + work done on/by a gas =W Vp hydrostatic pressure =p gh gravitational potential = r Gm− temperature T/K = T/C + 273.15 pressure of an ideal gas p =  2 3 1 cV Nm mean translational kinetic energy of an ideal gas molecule =E kT2 3 displacement of particle in s.h.m. x = x0 sin  t velocity of particle in s.h.m. v = v0 cos  t = 22 xxo − electric current I = Anvq resistors in series R = R1 + R2 + … resistors in parallel 1/R = 1/R1 + 1/R2 + … electric potential V = r Q o4 alternating current/voltage x = x0 sin  t magnetic flux density due to a long straight wire B = d o   2 I magnetic flux density due to a flat circular coil B = r No 2 I magnetic flux density due to a long solenoid B = Ino radioactive decay x = x0 exp(–t) decay constant  = 2 1 2ln t

4 9749/01/ASRJC/2023Prelim 1 Which expression involving base units is equivalent to the volt? A kg m2 s–1 A–1 B kg m s–2 A C kg m2 s–1 A D kg m2 s–3 A–1 2 The resistance of an electrical component is measured. The following meter readings are obtained. What is the resistance? A 2.5  B 2.7  C 2500  D 2700  3 A car moves with uniform acceleration along a straight road. Oil leaks from the car at the rate of one drop every two seconds. The diagram shows the distances between three successive oil drops on the road. What is the acceleration of the car? A 0.38 m s–2 B 0.75 m s–2 C 2.6 m s–2 D 5.3 m s–2

5 9749/01/ASRJC/2023Prelim [Turn Over 4 A double-ended launching device fires two identical steel balls X and Y at exactly the same time. The diagram shows the initial velocities of the balls. They are both launched horizontally, but Y has greater speed. Which statement explains what an observer would see? A Both X and Y reach the ground simultaneously, because air resistance will cause both to have the same final speed. B Both X and Y reach the ground simultaneously, because gravitational acceleration is the same for both. C X reaches the ground before Y, because X lands nearer to the launcher. D Y reaches the ground before X, because Y has greater initial speed. 5 The graph shows the variation with time t of a braking force F acting on a 2.0 kg mass. The mass decelerates from an initial speed of 30 m s–1 to a final speed of 5.0 m s–1. What is the maximum force F exerted on the mass during this period of 10 s? A 5.0 N B 10 N C 20 N D 50 N F time t / s 0 2 4 6 8 10 force F / N

6 9749/01/ASRJC/2023Prelim 6 A stone S and a foam rubber ball R are identical spheres of equal volume. They are released from rest at time t = 0 and fall vertically through the air. Both reach terminal velocity. Which graph best shows the variation with time t of the speed v of the stone and of the rubber ball? A B C D 7 A uniform rod of length x and weight W has a load 2.0W suspended at a distance 0.2x from one end. A string is attached to the rod such that the rod is suspended in equilibrium. The load is now moved so that it is a distance 0.2x from the other end of the rod. How far along the rod does the string need to be moved so that the rod returns to equilibrium? A 0.2 x B 0.3x C 0.4x D 0.6x R S R R S S R and S

7 9749/01/ASRJC/2023Prelim [Turn Over 8 Which statement about work done is correct? A More work is done to change the speed of an object from 2 m s–1 to 3 m s–1 than to change the speed of the same object from 1 m s–1 to 2 m s–1 B No work is done by a force that slows a moving object. C The same amount of work is done when lifting an object 1 m at a constant velocity and pulling the same object 1 m across a smooth horizontal surface at a constant velocity. D When an object is dropped, the force of gravity does no work. 9 A pulley of radius 0.40 m supports weights of 20 N and 15 N by means of a thin string, as shown. The weights are moved by slowly rotating the pulley clockwise through an angle of 60. What is the increase in the total gravitational potential energy of the weights? A 0.33 J B 2.0 J C 2.1 J D 15 J 10 A toy roller coaster attempts a loop -a-loop. It enters the bottom of loop of radius 1.0 m with insufficient speed. It loses contact at the point P as shown. The line joining P and the centre of the loop O makes an angle 30° with the vertical. What is the speed at P which the roller coaster just loses contact with the loop? A 0 m s–1 B 2.2 m s–1 C 2.9 m s–1 D 3.1 m s–1 P O 30° roller coaster enters

8 9749/01/ASRJC/2023Prelim 11 The acceleration of free fall at the surface of Neptune is approximately equal to the acceleration of free fall at the surface of the Earth. The mass of Neptune is 17 times the mass of the Earth. What is the value of the ratio radius of Neptune radius of Earth ? A 0.059 B 0.24 C 4.1 D 17 12 A car tyre, initially at 25 ⁰C, has been inflated to a pressure of 200 kPa as indicated by the pressure gauge. This means that the pressure in the tyre is 200 kPa above atmospheric pressure of 100 kPa. After driving on