RVHS H2 Physics P3 QP

River Valley High School Page 1 of 28 H2 Physics 9749 2025 JC 2 Preliminary Examinations RIVER VALLEY HIGH SCHOOL JC 2 PRELIMINARY EXAMINATIONS H2 PHYSICS 9749 / 3 PAPER 3 19 SEPTEMBER 2025 2 HOURS CANDIDATE NAME CENTRE NUMBER S INDEX NUMBER CLASS 2 4 J INSTRUCTIONS TO CANDIDATES DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO. FOR EXAMINERS’ USE Section A – do all questions 1 / 6 2 / 6 3 / 7 4 / 6 5 / 6 6 / 7 7 / 14 8 / 8 Section B – do ONE question only 9 / 20 10 / 20 Deduction TOTAL / 80 Read these notes carefully. Write your name, centre number, index number and class in the spaces at the top of this page and on all work you hand in. Candidates answer on the Question Paper. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. Section A Answer all questions. Section B Answer one question only. You are advised to spend one and half hours on Section A and half an hour on Section B. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 27 printed pages and 1 blank page

River Valley High School Page 2 of 28 H2 Physics 9749 2025 JC 2 Preliminary Examinations 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

River Valley High School Page 3 of 28 H2 Physics 9749 2025 JC 2 Preliminary Examinations Formulae uniformly accelerated motion 2 2 1 atuts += 22 2v u as=+ work done on / by a gas W p V= hydrostatic pressure p gh= gravitational potential  = − GM / r temperature T / K = T / C + 273.15 pressure of an ideal gas = 2 3 1 cV Nmp mean translational kinetic energy of an ideal gas molecule kTE 2 3= displacement of particle in s.h.m., x = x0 sin t velocity of particle in s.h.m., v = v0 cos t = )( 22 0 xx − electric current, I = Anvq resistors in series, 12R R R= + + resistors in parallel, 121/ 1/ 1/R R R= + + electric potential, r QV 04= alternating current/voltage, x = x0 sin t magnetic flux density due to a long straight wire, dB   2 0I= magnetic flux density due to a flat circular coil, r NB 2 0 I= magnetic flux density due to a long solenoid, InB 0= radioactive decay, x = x0 exp (−t) decay constant, 2 1 2ln t=

River Valley High School Page 4 of 28 H2 Physics 9749 2025 JC 2 Preliminary Examinations Section A Answer all the questions in this Section in the spaces provided. 1 (a) Distinguish between a systematic and a random error in the measurement of a physical quantity. …………………..….…………………………………………………………………....... …………………..….…………………………………………………………………....... …………………..….…………………………………………………………………....... …………………..….……………………………………………………………....... [2] (b) A travelling microscope fitted with a vernier scale is used to measure the internal diameter of a capillary tube. Fig. 1a and Fig. 1b show the vernier when the microscope is adjusted so that the cross -wires are aligned at opposite ends of a diameter. (i) Write down the two vernier readings. Fig. 1a = ……………… cm Fig. 1b = ……………… cm [1] (ii) State the absolute uncertainty in a single reading of the vernier. absolute uncertainty = ……………… cm [1] (iii) Hence determine the percentage uncertainty in the cross -sectional area of the capillary tube that could arise if it were calculated using these two readings. percentage uncertainty = ……………… % [2] Fig. 1a Fig. 1b

River Valley High School Page 5 of 28 H2 Physics 9749 2025 JC 2 Preliminary Examinations 2 A small ball of mass 34 g is thrown horizontally with a speed of 4.0 m s−1. It falls through a vertical height of 1.96 m before bouncing off a smooth horizontal plate as shown in Fig. 2.1. Fig. 2.1 Air resistance is negligible. (a) Calculate the vertical component of the velocity of the ball when it hits the plate. vertical component of the velocity = ……………… m s−1 [2] (b) State and explain the change, if any, in the horizontal component of the velocity of the ball before and after the collision with the plate. …………………..….………………………………………………………………….... …………………..….………………………………………………………………….... …………………..….………………………………………………………………….... …………………..….………………………………………………………………. [2] (c) Determine the impulse of the ball during the collision. impulse = ……………… N s [2] 1.96 m 0.98 m 4.0 m s−1 plate

River Valley High School Page 6 of 28 H2 Physics 9749 2025 JC 2 Preliminary Examinations 3 (a) Define moment of a force. …………………..….…………………………………………………………………….. …………………..….………………………………………………………………. [1] (b) A person supports a load of 20 N in his hand as shown in Fig. 3.1. The system of the hand and load is represented by Fig. 3.2. The rod represents the forearm and T represents the tension exerted in the biceps. The forearm weighs 65 N. Given that T = 410 N, determine the magnitude and direction of the force acting at the elbow. force acting at the elbow = ………………….. N direction of the force = ……………………………………………. [4] Fig. 3.2 Fig. 3.1 20 o o 20 N o 25 cm o 6.5 cm o 3.5 cm o 65 N o T, tension in biceps biceps elbow 20 N

River Valley High School Page 7 of 28 H2 Physics 9749 2025 JC 2 Preliminary Examinations (c) In order to break a stack of wooden boards, a karate expert has to move his arm and hand swiftly against it with considerable speed as shown in Fig. 3.3. Fig. 3.3 Using Newton’s laws of motion, explain why he has to execute the karate strike very quickly. …………………..….…………………………………………………………………….. …………………..….…………………………………………………………………….. …………………..….…………………………………………………………………….. …………………..….………………………………………………………………. [2]

River Valley High School Page 8 of 28 H2 Physics 9749 2025 JC 2 Preliminary Examinations 4 (a) A small metal sphere of mass m is moving vertically downwards through a viscous liquid. When it reaches a constant downward velocity v, the kinetic energy achieved is given by ½ mv2. Explain why the kinetic energy reached a constant value. …………………..….…………………………………………………………………….. …………………..….…………………………………………………………………….. …………………..….…………………………………………………………………….. …………………..….………………………………………………………………. [2] (b) Consider a constant horizontal applied force F acting on an object of mass m travelling with initial velocity u, achieving a final velocity of v, over a displacement of s as shown in Fig. 4.1. Fig. 4.1 By considering Newton’s Laws and equations of motion, derive an expression for the kinetic energy ½ mv2. State an assumption necessary for the derivation. …………………..….…………………………………………………………………….. …………………..….………………………………………………………………. [4] u v