2018 MJC P3 Qn

This document consists of 24 printed pages. [Turn over MERIDIAN JUNIOR COLLEGE JC2 Preliminary Examinations Higher 2 H2 Physics 9749/03 Paper 3 Longer Structured Questions 17 September 2018 2 hours Candidates answer on the Question Paper. No Additional Materials are required. Class Reg No Candidate Name: READ THESE INSTRUCTIONS FIRST Write your name, class and index number in the spaces at the top of this page. Write in dark blue or black pen on both sides of the paper. You may use a 2B 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. Section A Answer all questions. Section B Answer one question only. You are advised to spend about one and a half hours on Section A and half an hour on Section B. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Section A 1 / 10 2 / 7 3 / 9 4 / 4 5 / 5 6 / 10 7 / 15 Section B 8 / 20 9 / 20 Deductions Total / 80

Meridian Junior College H2 Physics Paper 3 JC2 Preliminary Examinations 2018 2 17 September 2018 Data speed of light in free space c = 3.00 × 108 m s−1 permeability of free space o = 4 × 10−7 H m−1 permittivity of free space ε0 = 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

Meridian Junior College H2 Physics Paper 3 JC2 Preliminary Examinations 2018 3 17 September 2018 [Turn over Formulae uniformly accelerated motion s = 21 2ut at+ v2 = u2 + 2as 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 p = 21 3 Nm cV  mean translation kinetic energy an ideal gas molecule E = 3 2 kT displacement of particle in s.h.m. x = xo sin t velocity of particle in s.h.m. v = v0 cos t =   22 oxx − electric current I = Anvq resistors in series R = R1 + R2 + … resistors in parallel 1/R = 1/R1 + 1/R2 + … electric potential V = 04 Q r alternating current/voltage x = x0 sin t magnetic flux density due to a long straight wire B = 0 2 d   I magnetic flux density due to a flat circular coil B = 0 2 N r  I magnetic flux density due to a long solenoid B = 0n I radioactive decay x = ( )0 expxt − decay constant  = 1 2 ln2 t

Meridian Junior College H2 Physics Paper 3 JC2 Preliminary Examinations 2018 4 17 September 2018 Section A Answer all the questions in the spaces provided. 1 (a) (i) State Newton’s first law of motion. ................................ ................................ ................................ ................................ ................................ ................................ ................................ ............................ [1] (ii) State the conditions for equilibrium. ................................ ................................ ................................ ................................ ................................ ................................ ................................ ................................ ................................ ................................ ................................ ................................ ................................ ................................ ................................ ............................ [2] (b) Fig. 1.1 shows a uniform ladder of weight 80 N resting on a smooth wall and a rough floor. The ladder makes an angle of 60° with the floor. (i) Show that the force exerted by the wall on the ladder is 23 N. [2] 60° Fig. 1.1

Meridian Junior College H2 Physics Paper 3 JC2 Preliminary Examinations 2018 5 17 September 2018 [Turn over (ii) Calculate the force exerted by the floor on the ladder. magnitude of force = ................................ ............... N direction of force : ................................ ................................ ............................... [3] (iii) A person now stands on the ladder. The ladder remains stationary. State and explain the effects, if any, on 1. the vertical force exerted by the floor on the ladder. ................................ ................................ ................................ ......................... ................................ ................................ ................................ ......................... ................................ ................................ ................................ ..................... [1] 2. the horizontal force exerted by the wall on the ladder. ................................ ................................ ................................ ......................... ................................ ................................ ................................ ......................... ................................ ................................ ................................ ..................... [1]

Meridian Junior College H2 Physics Paper 3 JC2 Preliminary Examinations 2018 6 17 September 2018 2 In an experiment to determine the specific heat capacity of a liquid, a student heated a fixed mass of the liquid for a fixed duration of time, using an electric heater. The student repeated the experiment three times to find the rise in temperature of the liquid. The following measurements were obtained: Mass of liquid, m 309  3 g Voltage applied across heater, V 11.8  0.3 V Current flow in the heater, I 4.125  0.002 A Time taken, t 200.0  0.5 s The rise in temperature  was recorded for each attempt: Attempt: 1st 2nd 3rd  / K 10.2 9.7 10.5 (a) Estimate the uncertainty in  . uncertainty in  = ................................ .............. K [1] (b) Calculate the specific heat capacity c of the liquid. c = ................................ . J kg−1 K−1 [2]

Meridian Junior College H2 Physics Paper 3 JC2 Preliminary Examinations 2018 7 17 September 2018 [Turn over (c) Calculate the uncertainty in specific heat capacity c of the liquid and express the specific heat capacity c together with its uncertainty. c = ...............................  ..................... J kg−1 K−1 [3] (d) State an assumption made in your calculation of the specific heat capacity c of the liquid. ................................ ................................ ................................ ................................ ......... ................................ ................................ ................................ ................................ ..... [1]

Meridian Junior College H2 Physics Paper 3 JC2 Preliminary Examinations 2018 8 17 September 2018 3 (a) State Newton’s second law of motion. ................................ ................................ ................................ ................................ ......... ................................ ................................ ................................ ................................ ......... ................................ ................................ ................................ ................................ ..... [1] (b) A