2025 RI H2 Physics Prelims P3 Section A Questions

This document has 18 pages. RAFFLES INSTITUTION PRELIMINARY EXAMINATION 2025 Higher 2 CANDIDATE NAME CLASS INDEX NUMBER CLASS 2 5 S 0 PHYSICS Paper 3 Longer Structured Questions Section A 9749/03 24 September 2025 2 hours You must answer on the question paper. No additional materials are needed. INSTRUCTIONS • Use a black or dark blue pen. You may use an 2B pencil for any diagrams or graphs. • Write your name, index number and class in the spaces at the top of the page. • Write your answer to each question in the space provided. • Do not use an erasable pen. Do not use correction fluid or tape. • You may use an approved calculator. Section A Answer all questions. Section B Answer one question only. You are advised to spend one and a half hours on Section A and half an hour on Section B. The number of marks for each question or part question is shown in brackets [ ]. For Examiner’s Use 1 / 7 2 / 7 3 / 10 4 / 10 5 / 8 6 / 10 7 / 8 8 / 20 9 / 20 Deduction Total / 80

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 Section A Answer all the questions in the spaces provided. 1 A ball is released from rest at the 80th floor of a very tall building. The height of each floor of the building is 3.0 m and the point of release is 240 m from the ground level as