TMJC 2025 H2 Physics P2 QP

CANDIDATE NAME ( ) CIVICS GROUP _________________________________________________________________________ H2 PHYSICS 9749/02 Paper 2 Structured Questions 17 September 2025 2 hours Candidates answer on the Question Paper. No Additional Materials are required. _________________________________________________________________________ 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 or graphs. 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 25 printed pages and 1 blank page. TAMPINES MERIDIAN JUNIOR COLLEGE JC2 PRELIMINARY EXAMINATION For Examiners’ Use 1 / 8 2 / 9 3 / 8 4 / 8 5 / 9 6 / 8 7 / 10 8 / 20 Deduction Total / 80

2 Tampines Meridian Junior College 2025 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 = 813.00 10 m s − 714 10 H m −− 12 18.85 10 F m−− ( )( ) 911/ 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 2025 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 Nm c V 3 2 22 oxx − 12RR++ 1 / R 121/ 1/RR++ 04 Q r 0 2 d   I 0 2 N r  I 0n I ( )0 expxt −  1 2 ln2 t

4 Tampines Meridian Junior College 2025 JC2 Preliminary Examination H2 Physics Answer all the questions in the spaces provided. 1 A circuit is set up to measure the resistance of an unknown resistor X as shown in Fig. 1.1. Fig. 1.1 (a) When the switch is closed, the average drift velocity v of electrons moving through a wire is given by the equation, Fv e = where e is the charge on an electron, F is a force acting on the electron, and  is a constant. Determine the SI base units of . SI base units = …………………………. [2] A V X

5 Tampines Meridian Junior College 2025 JC2 Preliminary Examination H2 Physics (b) An analogue voltmeter is used to take measurements of the potential difference across X. For these measurements, state one example of (i) a systematic error, …………………………………………………………….…………………… [1] (ii) a random error. …………………………………………………………….…………………… [1] (c) The variable resistor is adjusted to give a new set of readings which, when repeated, give average values of potential difference V and current I of 3.00 ± 0.03 V and 4.9 ± 0.1 mA respectively. (i) Show that the resistance of X is 612 . [1] (ii) Determine the actual uncertainty in the value of resistance of X showed in (i). Hence state the value of resistance of X with its actual uncertainty to an appropriate number of significant figures. resistance of X = …………………. ± ……………….  [2] (d) When an experiment such as this is performed, it is common practice to adjust the variable resistor to obtain several sets of values of potential difference and current. These sets of values are then plotted on a graph from which the resistance of X may be deduced. Discuss one advantage of this procedure compared with the determination of resistance of X from a single set of readings. …………………………………………………………….…………………………………... ………………………………………………………………………............................ [1]

6 Tampines Meridian Junior College 2025 JC2 Preliminary Examination H2 Physics 2 An object of mass 0.25 kg is launched with an initial speed, u, at an angle of o40 from the top of a cliff 100 m tall, as shown in Fig. 2.1. Fig 2.1 The minimum kinetic energy of the object during the trajectory is 12.5 J . Assume that air resistance is negligible. (a) Explain why kinetic energy is minimum at the top of the trajectory. …………………………………………………………….………………………………....... …………………………………………………………….……………………………. [1] (b) Show that u is 13 m s−1. [2] cliff ground o40 100 m u

7 Tampines Meridian Junior College 2025 JC2 Preliminary Examination H2 Physics (c) The object was in the air for a duration of time t before hitting the ground. (i) Determine time t. t = …………………..… s [2] (ii) Calculate the horizontal distance travelled by the object before hitting the ground. horizontal distance = ………………………. m [1] (iii) Determine the magnitude and direction of the velocity of the object just before it hits the ground. magnitude of velocity = …………………..… m s−1 direction: …………………….…..… [3]

8 Tampines Meridian Junior College 2025 JC2 Preliminary Examination H2 Physics 3 An object of density o, and volume Vo, is placed in a fluid of density f, as shown in Fig 3.1. The acceleration of free fall is g. Fig. 3.1 (a) State the origin of upthrust. …………………………………………………………….………………………………....... …………………………………………………………….……………………………. [1] (b) State an expression, in terms of o, Vo, f and g where appropriate, for (i) weight of the object, W …………………………………………………………………………………… [1] (ii) upthrust acting on the object, U …………………………………………………………………………………… [1] (c) The object starts to sink from rest in the fluid. With suitable working, show whether o is greater, lesser, or equal to f. [2] fluid of density f object, volume Vo density o

9 Tampines Meridian Junior College 2025 JC2 Preliminary Examination H2 Physics (d) The object sinks for a long time. Describe and explain how the motion of the object changes until it reaches terminal velocity. …………………………………………………………………………………….…………… …………………………………………………………………………………….…………… …………………………………………………………………………………….…………… …………………………………………………………………………………….…… [3]

10 Tampines Meridian Junior College 2025 JC2 Preliminary Examination H2 Physics 4 The “Round Up” is a hollow cylindrical ride with radius 8.0 m, as shown in Fig. 4.1. When it spins about its axis at sufficien