2025 RI H2 Physics Prelims P1 Questions

This document has 15 pages. RAFFLES INSTITUTION PRELIMINARY EXAMINATION 2025 Higher 2 CANDIDATE NAME CLASS INDEX NUMBER CLASS 2 5 S 0 PHYSICS Paper 1 Multiple Choice 9749/01 25 September 2025 1 hour You must answer on the multiple choice answer sheet You will need: Multiple choice answer paper Soft clean eraser Soft pencil (type 2B is recommended) INSTRUCTIONS • 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 multiple choice answer sheet. • Follow the instructions on the multiple choice answer sheet. • Write in soft pencil. • Write your name, class and index number on the multiple choice answer sheet in the spaces provided. • Do not use correction fluid or tape. • You may use an approved calculator. INFORMATION • The total mark for this paper is 30. • Each correct answer will score one mark. • Any rough working should be done on this question paper.

2 © Raffles Institution 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 Formulae uniformly accelerated motion s = 21 2ut at+ 2v = 2 2u as+ work done on/by a gas W = pV hydrostatic pressure p = ρgh gravitational potential  = Gm r− temperature T / K = / C 273.15T + pressure of an ideal gas p = 21 3 Nm cV mean translational kinetic energy of an ideal gas molecule E = 3 2 kT displacement of particle in s.h.m. x = 0 sinxt  velocity of particle in s.h.m. v = 0 cosvt  22 0xx=  − electric current I = Anvq resistors in series R = 12 RR++ resistors in parallel 1/R = 121 1 RR++ electric potential V = 4 Q r  alternating current/voltage x = 0 sinxt  magnetic flux density due to a long straight wire B = 0 2 d   I magnetic flux density due to a flat circular coil B = 0 2 N r  I magnetic flux density due to a long solenoid B = 0n I radioactive decay x = ( )0 expxt − decay constant  = 12ln2 t

3 © Raffles Institution [Turn over 1 The arrow represents a vector R. Which diagram does not represent R as two perpendicular components? A B C D

4 © Raffles Institution 2 A car X travels at constant speed u along a straight road. At time t = 0, a second car Y is a distance d0 behind car X and travel s at a speed v in the same direction. Speed v is less than speed u. At time t = 0, car Y begins to accelerate with constant acceleration. Car Y overtakes car X at time t = T. Which graph best shows the variation with time t of the distance d between the cars? A B C D car Y v car X u do 0 0 t d d0 T 0 0 t d d0 T 0 0 t d d0 T 0 0 t d d0 T

5 © Raffles Institution [Turn over 3 Two crates, of masses 15 kg and 30 kg, are in contact and placed on a frictionless incline that makes an angle of 30 to the horizontal. A constant force of 630 N parallel to the surface of the incline is applied to the 30 kg crate. What is the force that each crate exerts on the other? A 63 N B 140 N C 210 N D 420 N 4 The force F required to extend a spring of unstretched length x0 to a length x is measured. When the tension in the spring is T1, the length of the spring is x1. When the tension in the spring is T2, the length of the spring is x2. What is the work done to stretch the spring from length x1 to length x2? A ( )( )2 2 0 1 2 T x x − B ( )( )1 2 2 1 1 2 T T x x+− C ( )( )1 2 2 1 0 1 22 T T x x x+ + − D ( )( )1 2 2 1 0 1 22 T T x x x+ − − 30 630 N 30 kg 15 kg T1 T2 x1 x2 F x x0 0

6 © Raffles Institution 5 Which statement is correct? A An object with only a couple acting on it is in translational equilibrium. B An object with only a couple acting on it is in equilibrium. C The direction of the torque of a couple depends on where the pivot is. D A couple is an action-reaction pair of forces. 6 The variation with displacement x of the potential energy U of a body is shown. What is the magnitude of the force acting on the body at x = 0.30 m? A 0.090 N B 0.17 N C 3.0 N D 6.0 N 7 A driving force of 2 50 N is needed for a car of mass 900 kg to travel along a level road at a constant speed of 24 m s−1. What power is required to maintain the car at this speed when it is moving up a slope that rises 1.0 m for every 12 m of travel along the road? A 6.8 kW B 12 kW C 18 kW D 24 kW 8 A ball of mass 0.10 kg is attached to a string and swung in a vertical circle of radius 0.50 m. The speed of the ball at the top of the circle is 6.0 m s−1. What is the tension in the string at this instant? A 0.98 N B 6.2 N C 7.2 N D 8.2 N 0.00 0.50 1.00 1.50 2.00 0.00 0.10 0.20 0.30 0.40 U / J x / m

7 © Raffles Institution [Turn over 9 A spherical body of radius r has uniform density . What is the gravitational potential on its surface? A − 24 Gr B − 24 3 Gr C − 4 3 Gr D  24 3 Gr 10 Two planets X and Y travel anticlockwise in circular orbits about a star. The radii of their orbits are in the ratio 3:1. Diagram 1 shows the positions of X and Y at time t = 0. They are aligned such that they make a straight line with the star. Diagram 2 shows the position of X at a later time t = t1. The angular displacement of planet X is 90 from its initial position. Which diagram shows the position of planet Y at time t = t1? A B C D Y X Y X Y X Y X Y X diagram 1 star X star diagram 2

8 © Raffles Institution 11 A particle oscillating horizontally with simple harmonic motion has a displacement given by the equation: x = 3.0 sin(20t), where x is the displacement in metres and t is the time in seconds. What is the displacement of the particle when the kinetic energy of the particle is equal to the potential energy? A 0 m B 1.5 m C 2.1 m D 3.0 m 12 Which of the following is an example of resonance? A A car oscillates with a large amplitude after going over a hump. B A string that is fixed on both ends is plucked in the middle and it starts to vibrate. C Increasing the initial displacement of a pendulum such that it oscillates at a larger amplitude. D A child on a swing is given a push whenever he is about to move forward such that the amplitude of the swing increases. 13 A beam of vertically polarised light is incident normally on a polarising filter. The filter is rotated such that it is always in a plane perpendicular to the beam of light. The polarising axis of the filter is initially vertical as shown. The filter is first rotated clockwise by an angle of 30  and the transmitted light waves have intensity I. The filt