2026 EJC H2 Physics Prelims P3

©EJC 2026 9478/J2H2PRELIM/2026 [Turn over EUNOIA JUNIOR COLLEGE JC2 PRELIM EXAMINATIONS 2026 General Certificate of Education Advanced Level Higher 2 CANDIDATE NAME CIVICS GROUP 2 5 - REGISTRATION NUMBER PHYSICS Paper 3 Longer Structured Questions 9478/03 16th September 2026 2 hours READ THESE INSTRUCTIONS FIRST Write your name, civics group and registration number on all the work you hand in. The use of an approved scientific calculator is expected, where appropriate. Answer all questions. Section A Answer all questions. Section B Answer one question only. 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 paper clips, highlighters, glue or correction fluid. The number of marks is given in brackets [ ] at the end of each question or part question. This document consists of 24 printed pages and 4 blank pages. For Examiner’s Use Section A Q1 10 Q2 10 Q3 5 Q4 8 Q5 6 Q6 8 Q7 8 Section B Q8 20 Q9 20 s.f. P3 Total 75

2 ©EJC 2026 9478/J2H2PRELIM/2026 Formulae uniformly accelerated motion  =+  =+ = = = =− =  + = 2 22 2 1 2 2 / K / C 273 15 1 3 3 2 at u as V p Gm r T T . Nmpc V s ut v Wp F A E kT work done on / by a gas pressure gravitational potential temperature pressure of an ideal gas mean translational kinetic energy of an ideal gas molecule Data speed of light in free space    − −− −− − − − − − − −− − −      = = = =  =   = = = = = = =  81 71 0 12 1 0 91 0 19 34 27 31 e 27 p 11 23 1 A 23 10 m s 10 H m 10 F m 1( 8 99 10 m F 10 C 6 63 10 J s 1 66 10 kg 10 kg 10 kg J K mol 3 00 4 8 85 )4 1 6 02 10 mol 1 60 9 11 1 0 J 67 8 31 1 38 c. . e. . . R. N . h. u. m . m . k − −− − = = 1 11 2 2 2 K 10 N m 6 67 9 kg s81 m G. g. permeability of free space permittivity of free space elementary charge, the Planck constant, unified atomic mass constant, rest mass of electron, rest mass of proton, molar gas constant, the Avogadro constant, the Boltzmann constant, gravitational constant, acceleration of free fall,

3 ©EJC 2026 9478/J2H2PRELIM/2026 [Turn over displacement of particle in s.h.m. ( ) 0 22 00 12 12 12 12 2 2 0 0 0 0 0 0 0 2 2 2 0 1 2 sin cos 1 1 1 1 1 1 1 1 1 2 2 2 1 4 sin 2 2 8 ln2 t t n t x x t v v t x x R R R R C C C C QU QV CV C Q Q e Q Q e RC QV r x x t B d NB r Bn hEn mL e t nAvq RR CC xx             − − − = = =  − ++ = + + = + + ++ = = = =−   = = =  = =  = = = = = = = = I I I I     velocity of particle in s.h.m. electric current resistors in series resistors in parallel capacitors in series capacitors in parallel energy in a capacitor charging a capacitor discharging a capacitor RC time constant electric potential alternating current/voltage magnetic flux density due to a long straight wire magnetic flux density due to a flat circular coil magnetic flux density due to a long solenoid energy states for quantum particle in a box radioactive decay radioactive decay constant

4 ©EJC 2026 9478/J2H2PRELIM/2026 Section A Answer all the questions in this section in the spaces provided. 1 (a) Define moment of a force. ………………………………………………………………………………................................. ……………………………………………………………………….………………………….. [1] (b) Fig. 1.1 shows a uniform metal beam pivoted at one end O and held in equilibrium in a horizontal plane by a spring attached to its other end P. The spring has an unstretched length of 7.0 m and obeys Hooke’s law. Fig. 1.1 (not to scale) The beam has mass 190 kg and length 6.8 m. The spring makes an angle of 35 to the beam. A pile of bricks of total mass 120 kg is placed on the beam. (i) Show that the extension of the spring is 1.3 m. [1] (ii) On Fig. 1.1, draw labelled arrows to show all the forces acting on the beam. [2] wall beam bricks spring O P

5 ©EJC 2026 9478/J2H2PRELIM/2026 [Turn over (iii) Right now, the centre of the pile of bricks is 5.0 m away from end P. Calculate the spring constant k of the spring. k = ……………………… N m-1 [2] (iv) Calculate the elastic potential energy EP of the spring. EP = ……………………… J [2] (v) The spring in Fig. 1.1 is now replaced with an inextensible string such that the beam remains in the original horizontal position. Describe and explain what would happen to the force exerted by the string on the beam as the pile of bricks is slowly moved towards the pivot O while maintaining equilibrium. ………………………………………………………………………………...................... ………………………………………………………………………………...................... ………………………………………………………………………………...................... ………………………………………………………………………………...................... ………………………………………………………………………………...................... ………………………………………………………………………………...................... ………………………………………………………………………………...................... ……………………………………………………………………….………………….. [2] [Total: 10]

6 ©EJC 2026 9478/J2H2PRELIM/2026 2 A small ball of mass 90 g rests at point P on a smooth curved track of radius r, as shown in Fig. 2.1. The ball is moved a small distance to one side and is then released. The horizontal displacement x of the ball is related to its horizontal acceleration a towards P, by the expression gxa r=− (a) Explain why the horizontal oscillation undertaken by the ball can be taken as simple harmonic motion. ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………[2] (b) The radius r of curvature of the track is 28 cm. Determine the angular frequency of the oscillation. angular frequency = …………………….. rad s−1 [2] (c) After some time, t he variation with time t of the displacement x of the ball is plotted as shown in Fig. 2.2. T is the period of oscillation. x/ cm Fig. 2.2 T 5.0 t/ s 0 −5.0

7 ©EJC 2026 9478/J2H2PRELIM/2026 [Turn over (i) On the axes of Fig. 2.3, sketch the variation with time t of the acceleration a of the ball. [2] (ii) The track is subsequently brought to a room with high humidity and moisture is formed on the track such that the ball comes to a rest after 10 oscillations. On the axes of Fig. 2.2, sketch the variation with time t of the displacement x of the ball, for the first two periods after moisture has formed. [2] (iii) After many oscillations, the amplitude of oscillation decreased from 5.0 cm to 2.5 cm. Calculate the loss in energy of the oscillation. loss in energy = …………………… J [2] [Total: 10] t/ s Fig. 2.3 a/ m s−2 T 0

8 ©EJC 2026 9478/J2H2PRELIM/2026 3 A cup contains 0.22 kg of water at a temperature 5.0 C. A bucket contains 0.50 kg of ice at a temperature of −8.0 C. Data: specific heat capacity of water: 11 water 4.18 J g Cc −−= specific heat capacity of ice: 11 ice 2.09 J g Cc −−= latent heat of fusion of ice: 1 f 334 J gL −= (a) Determine, for the water in the cup, (i) the heat released if its temperature decreases to 0 C; heat released = ……………………… J [1] (ii) the heat released by the 0 C water if it freezes to 0 C ice; heat released = ……………………… J [1] (b) Determine, for the ice in the bucket, the heat absorbed by the ice if its temperature increases to 0 C. heat absorbed = ……………………… J [1]

9 ©EJC 2026 9478/J2H2PRELIM/2026 [Turn over (c) A cup of water, o