2013_JJC_H2_Physics_P2

JJC 2013 9646/Prelims P2/2013 [Turn Over JURONG JUNIOR COLLEGE 2013 Preliminary Examination Name Class 12S PHYSICS Higher 2 Structured Questions Candidates answer on the Question Paper. No additional materials are required. 9646/2 4 Sep 2013 1 hour 45 minutes READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write your name and class in the space provided at the top of this page. Write in dark blue or black pen. You may use a soft pencil for any diagrams, graphs or rough working. Do not use highlighters, glue or correction fluid. There are eight questions in this paper. 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 /5 2 /6 3 /10 4 /7 5 /10 6 /8 7 /14 8 /12 Total /72 (This question paper consists of 20 printed pages)

JJC 2013 9646/Prelims P2/2013 [Turn Over 2 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, o = 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 Formulae uniformly accelerated motion, s = ut + 1 2 at2 v2 = u2 + 2as work done on/by a gas, W = p V hydrostatic pressure, p = gh gravitational potential,  =  Gm r displacement of particle in s.h.m., x = xo sin t velocity of particle in s.h.m., v = vo cos t v = 22() ox x mean kinetic energy of a molecule of an ideal gas E = 3 2 kT resistors in series, R = R1 + R2 + . . . resistors in parallel, 1/R = 1/R1 + 1/R2 + . . . electric potential, V = o Q ε r4 alternating current / voltage, x = xo sin t transmission coefficient, T  exp(2kd) where k = 2 2 8( )mU E h  radioactive decay x = xo exp(-λt) decay constant λ = 1/ 2 0.693 t

JJC 2013 9646/Prelims P2/2013 [Turn Over 3 1 The period of oscillation of a pendulum is given by the equation 2 lT g where l is the length of the pendulum and g is acceleration of free fall. To determine g, a student obtained the following data: Period of oscillation = (0.910  0.005) s Length of pendulum = (20.6  0.1) cm (a) Determine the percentage uncertainty in g. percentage uncertainty = % [2] (b) Express g together with its associated uncertainty. g = (  ) m s-2 [3]

JJC 2013 9646/Pre