2024 Serangoon SS Sci(Phy) Prelim P2 Section A

SERANGOON SECONDARY SCHOOL PRELIMINARY EXAMINATION SECONDARY 4 EXPRESS CANDIDATE NAME ( ) CLASS CENTRE NUMBER S INDEX NUMBER SCIENCE PHYSICS 5086/02 Paper 2 (Section A) 26 Aug 2024 1 hour 15 minutes Candidates answer on the Question Paper. Setter(s): READ THESE INSTRUCTIONS FIRST Write your Centre number, index number and name on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staplers, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. Section A Answer all questions. Write your answers in the spaces provided on the question paper. The number of marks is given in brackets [ ] at the end of each question or part question. This question paper consists of 18 printed pages, including this cover page. For examiner’s use Section A 55

2 Section A [55 marks] Answer all questions. 1 Fig. 1.1 shows a 9.6 m uniform beam that is in equilibrium. The beam is supported at its centre by a pivot. Fig. 1.1 (a) State the principle of moments. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… ……………………………………………………………………………………. [1] (b) Calculate the value of F. F = ………………………… N [2] [Total: 3]

3 2 Fig. 2.1 shows a ride at the amusement park. The carriage is pulled up the slope by an electric motor. Once the carriage reaches point A, the motor is switched off and the carriage will go through points B and C before coming to a stop at the bottom of the track. Fig. 2.1 The vertical height is 30 m at A and 10 m at C. The combined mass of the carriage and passengers is 450 kg. Assume that the friction between the carriage and track is negligible. The gravitational field strength g is 10 N/kg. (a) Calculate the amount of energy transferred to the gravitational potential store of the carriage at point A. gravitational potential energy = ………………………… J [2]

4 (b) Calculate the amount of energy in the kinetic store of the carriage at point C. kinetic energy = ………………………… J [2] (c) Hence, calculate the speed of the carriage at point C. speed = ………………………… m/s [2] [Total: 6]

5 3 Fig. 3.1 shows the positions of particles in an undisturbed medium. Fig. 3.2 and Fig. 3.3 shows the position of the particles at t = 0 s and t = 0.2 s respectively when a sound wave passes through the medium. Fig. 3.1 Fig. 3.2 Fig. 3.3 (a) In terms of the direction of wave travel and the medium’s particle vibration, describe how Fig. 3.2 shows that sound is a longitudinal wave. …………………………………………………………………………………………… ……………………………………………………………………………………. [1]

6 (b) The particles executed a quarter of the oscillation between t = 0 s and t = 0.2 s. Calculate the frequency of the wave. frequency = ………………………… Hz [2] (c) On Fig. 3.3, mark the wavelength of the sound wave using a double headed arrow “→”. Label it with the symbol λ. [1] (d) Calculate the speed of the wave. speed of wave = ………………………… m/s [2] [Total: 6]

7 4 Fig. 4.1 shows a ray of light travelling from air into a rectangular glass block with refractive index of 1.50. Fig. 4.1 (a) Calculate the angle of incidence, i. angle of incidence, i = …………………………° [2] (b) On Fig. 4.1, draw how the ray of light emerges from the side YZ. [1] [Total: 3]

8 5 Fig. 5.1 shows an object placed at a distance of 40 cm in front of a converging lens with focal length 10 cm. Fig. 5.1 (a) The magnification factor of a converging lens can be calculated using the formula size of imagemagnification factor = size of object Using Fig. 5.1, determine the magnification factor of the converging lens. magnification factor = ………………………… [2] (b) State a real world application for this lens in Fig. 5.1. …………………………………………………………………………………………… ……………………………………………………………………………………. [1]

9 (c) State two changes that would be observed about the image when the object is placed at a distance of 15 cm in front of the lens. …………………………………………………………………………………………… ……………………………………………………………………………………. [2] [Total: 5] 6 Fig. 6.1 shows a circuit with a 12.0 V supply. All the resistors in the circuit are identical with a resistance of 5.0 Ω each. Fig. 6.1 (a) (i) Calculate the effective resistance of the whole circuit shown in Fig. 6.1. effective resistance of whole circuit = ………………………… Ω [2]

10 (ii) Calculate the current supplied by the battery. current = ………………………… A [2] (b) Fig. 6.2 shows the same circuit with a wire added to connect points X and Y. Fig. 6.2 Determine the effective resistance of the new circuit. effective resistance of whole circuit = ………………………… Ω [2] [Total: 6]