2018 MJC P2 Qn

This document consists of 24 printed pages. [Turn over MERIDIAN JUNIOR COLLEGE JC2 Preliminary Examinations Higher 2 H2 Physics 9749/02 Paper 2 Structured Questions 12 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 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. 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 1 / 6 2 / 8 3 / 11 4 / 10 5 / 10 6 / 8 7 / 7 8 / 20 Deductions Total / 80

Meridian Junior College H2 Physics Paper 2 JC2 Preliminary Examinations 2018 2 12 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 2 JC2 Preliminary Examinations 2018 3 12 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 2 JC2 Preliminary Examinations 2018 4 12 September 2018 Answer all the questions in the spaces provided. 1 (a) For an oscillating body, state what is meant by (i) natural frequency of vibration, ................................ ................................ ................................ ................................ ................................ ................................ ................................ ................................ ................................ ................................ ................................ ........................... [1] (ii) resonance. ................................ ................................ ................................ ................................ ................................ ................................ ................................ ................................ ................................ ................................ ................................ ............................ [1] (b) State and explain one situation where resonance is useful. ................................ ................................ ................................ ................................ ......... ................................ ................................ ................................ ................................ ......... ................................ ................................ ................................ ................................ ......... ................................ ................................ ................................ ................................ ..... [2] (c) In some situations, resonance should be avoided. State one such situation and how the effects of resonance are reduced. ................................ ................................ ................................ ................................ ......... ................................ ................................ ................................ ................................ ......... ................................ ................................ ................................ ................................ ......... ................................ ................................ ................................ ................................ ..... [2]

Meridian Junior College H2 Physics Paper 2 JC2 Preliminary Examinations 2018 5 12 September 2018 [Turn over 2 A particle in a medium is oscillating because of the passage of a transverse wave W1. The wave has intensity I at this point. The amplitude of the oscillation is A. Fig. 2.1 shows the variation with time t of the displacement x of the particle. Fig. 2.1 A second, similar transverse wave W2 has the same frequency and is incident on the same particle. The amplitude of the oscillation due to W2 alone is 5 2 A at this point. (a) Calculate (i) the frequency of the waves, frequency = ................................ ............ Hz [1] (ii) the intensity, in terms of I, of the wave W2. intensity = ................................ ............... I [2] x t / ms 0 0 2.5 5.0 7.5 A

Meridian Junior College H2 Physics Paper 2 JC2 Preliminary Examinations 2018 6 12 September 2018 (b) (i) State two conditions which are necessary for the waves W1 and W2 to produce an observable interference pattern. ................................ ................................ ................................ ................................ ................................ ................................ ................................ ............................ [2] (ii) State the condition that must be satisfied if the waves are to interfere to produce a minimum resultant intensity at a point. ................................ ................................ ................................ ................................ ................................ ................................ ................................ ............................ [1] (iii) Calculate, in terms of I, this minimum intensity. minimum intensity = ................................ ............... I [2]

Meridian Junior College H2 Physics Paper 2 JC2 Preliminary Examinations 2018 7 12 September 2018 [Turn over 3 (a) State two differences between stationary waves and progressive waves. 1. ................................ ................................ ................................ ................................ ..... ................................ ................................ ................................ ................................ ......... 2. ................................ ................................ ................................ ................................ ..... ................................ ................................ ................................ ................................ ..... [2] (b) (i) A laser produces a narrow beam of coherent l