VJC 2025 J2 H2 Phy Prelim Paper 1

VJC 2025 9749/01/J2Prelim [Turn over VICTORIA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CANDIDATE NAME CLASS TUTOR NAME PHYSICS 9749/01 Paper 1 Multiple Choice 22 September 2025 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, class and tutor name in the spaces on the top of this page. 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.

2 VJC 2025 9749/01/J2Prelim Data speed of light in free space c = 3.00 × 108 m s−1 permeability of free space  = 4 × 10−7 H m−1 permittivity of free space  = 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

3 VJC 2025 9749/01/J2Prelim [Turn over Formulae uniformly accelerated motion 21 2s ut at=+ 22 2v u as=+ work done on / by a gas W p V= hydrostatic pressure p gh= gravitational potential /Gm r =− temperature / / C 273.15T K T=  + pressure of an ideal gas 21 3 Nmpc V=   mean translational kinetic energy of an ideal molecule 3 2E kT= displacement of particle in s.h.m. 0 sinx x t = velocity of particle in s.h.m. 0 cosv v t = 22 0xx=  − electric current =I Anvq resistors in series 12 . . .R R R= + + resistors in parallel 121/ 1/ 1/ . . .R R R= + + electric potential 04 QV r= alternating current/voltage 0 sinx x t = magnetic flux density due to a long straight wire  = IB d 0 2 magnetic flux density due to a flat circular coil = NIB r 0 2 magnetic flux density due to a long solenoid =B nI 0 radioactive decay 0 exp( )x x t =− decay constant 1 2 ln2 t =

4 VJC 2025 9749/01/J2Prelim 1 The e.m.f. induced in a coil by a changing magnetic flux is equal to the rate of change of flux with time. Which is a unit for magnetic flux? A kg m2 s−2 A−1 B kg m2 s−2 A C kg m2 s2 A−1 D m2 s−2 A−1 2 What is a reasonable estimate for the volume of a wooden metre rule found in a school laboratory? A 1.5 cm3 B 15 cm3 C 150 cm3 D 1500 cm3 3 A student carried out an experiment to determine the resistivity  of copper using a copper wire. The uncertainties in the measurements are shown. uncertainty in length l of wire = 0.2% uncertainty in diameter d of wire = 1.6% The equation for resistivity  is 2 .4 dR= l  He obtains a resistivity value of ( ) 81.71 0.07 10 −  m with its associated uncertainty. What is the uncertainty in the measurement of resistance R of the wire? A 0.007% B 0.7% C 0.9% D 7%

5 VJC 2025 9749/01/J2Prelim [Turn over 4 X and Y are vectors. The magnitude of X is less than the magnitude of Y. The vectors are initially in opposite directions. As Y is rotated through 180°, how does the magnitude of the vector (X − Y) vary? 5 A car, starting from rest at time t = 0, travels along a road. The distance travelled from the starting point is measured over the next 25 seconds. Which best describes the motion of the car? A The maximum speed during the first 20 seconds is 10 m s−1. B At some instant during the first 20 seconds the speed is exactly 20 m s−1. C The average speed for the first 200 m of the journey is 20 m s−1. D The average speed between 20 and 25 seconds is greater than that between 15 and 20 seconds.

6 VJC 2025 9749/01/J2Prelim 6 A boy with a ball was in a stationary lift. When the lift starts to accelerate upwards at 1.2 m s−2, the boy released the ball from a height of 1.5 m above the floor of the lift. What is the time taken by the ball to hit the floor of the lift? A 0.27 s B 0.52 s C 0.55 s D 0.59 s 7 Two blocks of masses m1 = 4.0 kg and m2 = 1.0 kg are connected by a cord of negligible mass that passes over a frictionless pulley of negligible mass. The blocks slide on frictionless planes inclined at angles θ1 = 30o and θ2 = 60o. What is the tension in the cord? A 2.3 N B 5.8 N C 8.0 N D 10.7 N 8 Two steel balls A and B of masses 2 M and 1M respectively move towards each other with the same speed v and collide elastically. What are the final velocities of the two balls in terms of v? Take the rightward direction as positive. final velocity of ball A final velocity of ball B A 4 3 v 7 3 v B v1 3− v5 3 C v1 3 v2 3 D v− v2 30o 60 o m1 m2 v v 2M M A B

7 VJC 2025 9749/01/J2Prelim [Turn over 9 A metal block is suspended by a spring balance and is fully submerged in a liquid. When the liquid is replaced with a less dense fluid, the reading on the spring balance A increases because upthrust decreases. B increases because the object displaces less fluid. C remains the same because the volume of the block is unchanged. D decreases because upthrust increases. 10 The figure below represents the various forces acting on a car moving towards the right. The driving force D acts on the front wheels and the total resistive force is represented by the force R. The weight W of the car is 12000 N and it acts on the centre of mass G which is 90 cm above the ground. Given that the values of D and R are both 7000 N, what are the values of the normal reaction forces at A and at B acting on the wheels? normal reaction force at A / N normal reaction force at B / N A 8100 3900 B 6000 6000 C 6150 5850 D 5850 6150 11 A speed boat has two identical motors. When both motors are working, the speed boat attained a maximum speed of 36.0 m s−1. Given that the drag force on the speed boat is proportional to the square of the speed, what is the maximum speed of the boat when only one motor is working? A 9.0 m s−1 B 18.0 m s−1 C 24.2 m s−1 D 28.6 m s−1 R D 1.5 m 0.50 m G

8 VJC 2025 9749/01/J2Prelim 12 A 20 g ball bearing is released from rest 10 cm above the top of an unstretched spring. It compresses the spring and comes to rest when the spring is compressed by 2.4 cm as shown in the figure below. What is the spring constant of the spring? A 2.0 N m −1 B 8.6 N m −1 C 68 N m −1 D 84 N m −1 13 A stone of mass m attached to a string is whirled in a vertical circle of radius r. At the top of the circle, the tension in the string is four times the stone’s weight. At this point the stone’s speed is A rg B 3rg C 4rg D 5rg 14 Satellites A and B of masses m and 2m are placed in geostationary orbits of radii rA and rB about the Earth, where the radii are measured from the centre of the Earth to the respective satellites. Which of the following statements is correct? A The radii rA and rB are the same. B Both satellites have the same centripetal force. C Both satellites have the same total energy. D Both satellites have the same gravitational force. 15 The escape speed of an oxygen molecule