TMJC 2024 H2 Physics P2 QP MS

CANDIDATE NAME ( ) CIVICS GROUP _________________________________________________________________________ H2 PHYSICS 9749/02 Paper 2 Structured Questions 11 September 2024 2 hours Candidates answer on the Question Paper. No Additional Materials are required. _________________________________________________________________________ Section B: Structured Questions READ THESE INSTRUCTIONS FIRST Write your name and Civics Group in the spaces at the top of the page. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. The use of an approved scientific calculator is expected, where appropriate. Answer all questions. The number of marks is given in brackets [ ] at the end of each question or part question. ______________________________________________________________________________ This document consists of 23 printed pages and 1 blank page. TAMPINES MERIDIAN JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATION For Examiners’ Use 1 / 8 2 / 8 3 / 6 4 / 8 5 / 10 6 / 10 7 / 10 8 / 20 Deduction Total / 80

2 Tampines Meridian Junior College 2024 JC2 Preliminary Examination H2 Physics Data speed of light in free space c = permeability of free space o = permittivity of free space ε0 = = elementary charge e = the Planck constant h = unified atomic mass constant u = rest mass of electron me = rest mass of proton mp = molar gas constant R = 8.31 J K−1 mol−1 the Avogadro constant NA = the Boltzmann constant k = gravitational constant G = acceleration of free fall g = 8 13.00 10 m s 7 14 10 H m   12 18.85 10 F m  9 11/ 36 10 F m   191.60 10 C 346.63 10 J s 271.66 10 kg 319.11 10 kg 271.67 10 kg 23 16.02 10 mol 23 11.38 10 J K  11 2 26.67 10 N m kg  29.81 m s

3 Tampines Meridian Junior College 2024 JC2 Preliminary Examination H2 Physics Formulae uniformly accelerated motion s = ut + at2 v2 = u2 + 2as work done on / by a gas W = pV hydrostatic pressure p = gh gravitational potential  = temperature T /K = T /°C + 273.15 pressure of an ideal gas p = mean translational kinetic energy of an ideal gas molecule E = kT displacement of particle in s.h.m. x = xo sin t velocity of particle in s.h.m. v = vo cos t =   electric current I = Anvq resistors in series R = … resistors in parallel = … electric potential V = alternating current / voltage X = xo sin t magnetic flux density due to a long straight wire B = magnetic flux density due to a flat circular coil B = magnetic flux density due to a long solenoid B = radioactive decay x = decay constant = 1 2 GM r 21 3 NmcV 3 2 2 2 ox x 1 2R R  1 / R 1 21/ 1/R R  04 Q r 0 2 d   I 0 2 N r  I 0n I 0expx t   12 ln2 t

4 Tampines Meridian Junior College 2024 JC2 Preliminary Examination H2 Physics Answer all the questions in the spaces provided. 1 Fig.1.1 shows an elongated block with a square cross sectional area of a particular conducting material. The rate of thermal energy transfer with respect to time, q, through the block is given by Tq py x      2 where p is the thermal conductivity of the material; y is the length of the square cross-sectional area of the material; T is the temperature difference between the two ends of the material; and x is the length of the block. Fig. 1.2 shows the data obtained in a particular experiment. Fig. 1.2 quantity value percentage uncertainty T 323 K ± 0.50% x 1.00 m ± 1.0% p 237 W m−1 K−1 ± 2.0% y 0.200 cm ± 3.0% (a) Determine the SI base units of p. SI base units of p = ………………… [2] y Fig. 1.1 x

5 Tampines Meridian Junior College 2024 JC2 Preliminary Examination H2 Physics (b) Using the values given in Fig. 1.2, (i) determine the value of q, to three significant figures. q = ………………… W [2] (ii) determine the percentage uncertainty of q. percentage uncertainty of q = …………………% [2] (c) Use your answer in (b) to determine the actual uncertainty in the value of q. Hence give a statement of q, with its uncertainty, to an appropriate number of significant figures. q = …………………± …………………W [2]

6 Tampines Meridian Junior College 2024 JC2 Preliminary Examination H2 Physics 2 A ball is released from rest at time t = 0 s and falls freely. It hits the ground after falling downwards for 2.0 s. Take the sign convention of up as positive. (a) State the acceleration of the ball during the fall. acceleration = ………………… m s−2 [1] (b) Show that the velocity of the ball just before it hits the ground is −20 m s−1. [1] After 0.20 seconds upon hitting the ground, the ball rebounds vertically from the ground with a speed of 10 m s−1. Fig. 2.1 (c) On Fig. 2.1, sketch the graph that shows the variation with time t of the velocity v of the ball up to the moment when the ball hits the ground for the second time. [3] (d) On your graph, mark and label the point X where the ball reaches its highest point after the first bounce. [1] velocity v / m s−1 t / s 1 2 3 4 5 0

7 Tampines Meridian Junior College 2024 JC2 Preliminary Examination H2 Physics (e) In real life, there is air resistance. Describe qualitatively the motion of the falling ball before it hits the ground. …………………………………………………………….…………………………………... …………………………………………………………….……………………………….….. …………………………………………………………….……………………….…… [2]

8 Tampines Meridian Junior College 2024 JC2 Preliminary Examination H2 Physics 3 A small metal sphere has a mass of 1.0 × 10−4 kg and charge +2.0 nC. It is placed between two parallel, oppositely-charged horizontal plates and directly above an insulated spring as shown in Fig. 3.1. The electric field strength is 1.5 × 105 V m−1. Fig. 3.1 (a) Determine the magnitude and direction of the electric force on the sphere. magnitude of electric force = ………………… N direction = …………………… [3] (b) The sphere is released from rest at a height of 0.50 m above the spring. The sphere hits the spring and causes a maximum compression of 0.015 m. Determine the spring constant. spring constant = ……………… N m−1 [3] charged metal sphere spring + + + + + + − − − − − −

9 Tampines Meridian Junior College 2024 JC2 Preliminary Examination H2 Physics 4 When a body is subject to a periodic driving force in the presence of damping, it moves in a simple harmonic motion. (a) Explain what is meant by simple harmonic motion. …………………………………………………………….…………………………………... …………………………………………………………….……………………………….….. …………………………………………………………….……………………….…… [2] Fig. 4.1 shows the variation with frequency of the amplitude of motion of a body subject to a periodic driving force of various frequency. Fig. 4.1 (b) Explain how Fig. 4.1 shows the presence of resonance. …………………………………………………………….………………………...………… …………………………………………………………….………………………….… [1] (c) State one situation where resonance is useful. …………………………………………………………….………………………...………… …………………………………………………………….………………………...………… …………………………………………………………….………………………….… [1]

10 Tampines Meridian Junior College 2024 JC2 Preliminary Examination H2 Physics (d) Calculate the maximum speed of the body when the driving frequency is 10.0 Hz. maximum speed = ………………… m s−1 [2] (e) On the axes of Fig. 4.2, sketch a