SAJC Prelim H2 P2 2025_Qn and Ans

1 SAJC 2025 Preliminary Examination / 9749 [Turn Over Class Index Number Name 24S ST. ANDREW’S JUNIOR COLLEGE JC 2 2025 Preliminary Examination PHYSICS, Higher 2 9749/02 Paper 2 Structured Questions 3rd September 2025 2 hours Candidates answer on the Question Paper. No additional materials are required. READ THESE INSTRUCTIONS FIRST Write your name, index number and Civics Group on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. Answer all questions. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use 1 / 12 2 / 8 3 / 7 4 / 10 5 / 10 6 / 13 7 / 20 Total / 80 This document consists of 23 printed pages including this page.

2 SAJC 2025 Preliminary Examination / 9749 [Turn Over Data speed of light in free space, c = 3.00 x 108 m s-1 permeability of free space, o = 4  x 10-7 H m-1 permittivity of free space, o = 8.85 x 10-12 F m-1 = (1/(36)) x 10-9 F m-1 elementary charge, e = 1.60 x 10-19 C the Planck constant, h = 6.63 x 10-34 J s unified atomic mass constant, u = 1.66 x 10-27 kg rest mass of electron, me = 9.11 x 10-31 kg rest mass of proton, mp = 1.67 x 10-27 kg molar gas constant, R = 8.31 J K-1 mol-1 the Avogadro constant, NA = 6.02 x 1023 mol-1 the Boltzmann constant, k = 1.38 x 10-23 J K-1 gravitational constant, G = 6.67 x 10-11 N m2 kg-2 acceleration of free fall, g = 9.81 m s-2 Formulae uniformly accelerated motion, s = u t + ½ a t2 v2 = u2 + 2 a s work done on/by a gas, W = p V hydrostatic pressure, p =  g h gravitational potential,  = r Gm− temperature, T / K = T / oC + 273.15 pressure of an ideal gas, p = 1 3 Nm v 〈c2〉 mean translational kinetic energy of an ideal gas molecule, E = 2 3 kT displacement of particle in s.h.m., x = xo sin  t velocity of particle in s.h.m., v = v0 cos  t v =   22 0 xx − electric current I = Anvq resistors in series, R = R1 + R2 + ... resistors in parallel, 1 / R = 1 / R1 + 1 / R2 + ... electric potential, V = r Q 04 alternating current/voltage, x = xo sin  t magnetic flux density due to a long straight wire, B = μ0I 2πd magnetic flux density due to a flat circular coil, B = μ0NI 2r magnetic flux density due to a long solenoid, B = μ0nI radioactive decay, x = xo exp (- t) decay constant,  = 2/1 2ln t

3 SAJC 2025 Preliminary Examination / 9749 [Turn Over Answer al