2013 JJC H2 Physics P1

JJC 2013 9646/JC2 Prelim Exam P1/2013 [Turn Over JURONG JUNIOR COLLEGE JC2 Preliminary Examination 2013 Name Class 12S PHYSICS Higher 2 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) 9646/1 20 Sept 2013 1 hour 15 min READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write your name and class in the spaces provided at the top of this page. Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, class and index number on the Answer Sheet in the spaces provided. There are forty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. (This question paper consists of 20 printed pages)

JJC 2013 9646/JC2 Prelim Exam P1/2013 [Turn Over 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/JC2 Prelim Exam P1/2013 [Turn Over 1 What is the tesla, the SI unit of magnetic flux density, expressed in SI base units? A N A-1 m-1 B kg A-1 s-1 C kg A-1 s-2 D kg A-1 m-2 s-2 2 A rubber ball hits a horizontal surface at a velocity 5 m s -1 and bounces off at 4 m s -1 as shown below. Which of the following indicates the direction of the force acting on the ball by the horizontal surface? A B C D 3 A ball was thrown with a velocity 5.0 m s1 at an angle of 30o below the horizontal from a height of 2.5 m as shown below. What was the speed of the ball just before it hit the floor? A 7.44 m s-1 B 7.85 m s1 C 8.38 m s1 D 8.61 m s1 30o floor 2.5 m 5.0 m s1

JJC 2013 9646/JC2 Prelim Exam P1/2013 [Turn Over 4 A force of 75 N pushes two blocks of mass 15.0 kg and 10.0 kg along a flat surface. The total frictional force between the blocks and the surface is 25 N. What is the magnitude of the resultant force on the 10.0 kg mass? A 20 N B 30 N C 45 N D 50 N 5 A particle of mass m travelling with velocity u collides elastically and head-on with a stationary particle of mass M. Which expression gives the velocity of the particle of mass m after the collision? A u B mu M C 2mu M + m D (M - m)u M + m 6 A tennis ball is able to float on water because A the mass of water displaced by the tennis ball is equal to the upthrust. B the upthrust acting on the tennis ball is greater than the weight of the tennis ball. C the pressure difference between the lower and the upper surfaces of the tennis ball gives rise to an upthrust equal to its weight. D the area of its lower surface is larger than the area of its upper surface. 75 N 15.0 kg 10.0 kg 25 N

JJC 2013 9646/JC2 Prelim Exam P1/2013 [Turn Over 7 A uniform rod XY is freely hinged to the wall at X. It is held horizontal by a force F acting from Y at an angle  to the vertical as shown in the diagram. Which of the four options (A, B, C and D) best shows the direction of the force exerted by the rod on the wall? 8 A force of 3800 N is required to move a vehicle of mass 1500 kg at constant speed along a horizontal road. In travelling 300 m along the road, the work done against frictional force is A 12.7 kJ B 450 kJ C 1140 kJ D 5700 kJ 9 A ball is dropped from the top of a tower of height H. Which graph shows the variation of the kinetic energy of the ball with distance x measured from the ground? A B C D

JJC 2013 9646/JC2 Prelim Exam P1/2013 [Turn Over 10 A body of mass 1 kg is supported from a fixed point by a light inextensible string of length 1 m. The body is made to rotate about the fixed point in a vertical circle so that its speeds at the highest and lowest points of the circle are the same. If the acceleration of free fall is 10 m s -2, calculate the difference between the tension in the string at the highest and lowest points. A 0 N B 1 N C 10 N D 20 N 11 A small mass m is suspended from one end of a vertical string and then whirled in a horizontal circle, of radius r, at a constant speed v. Which one of the following is true? A The angle of inclination to the vertical of the string depends on v and r only. B The angle of inclination to the vertical of the string depends on v, r and g only. C The tension in the string depends on m only. D The tension in the string depends on m, r, g and angle of inclination only. 12 Which statement about a geostationary satellite is true? A It can remain vertically above any chosen fixed point on Earth. B Its linear speed is equal to the speed of a point on the Earth’s equator. C It has the same angular velocity as the earth’s rotation about its axis. D It is always travelling from east to west. 13 The diagram shows two points X and Y at distances L and 2 L, respectively, from the centre of the Earth. The gravitational potential at X is -8 kJ kg-1. What is the change in gravitaitonal potential energy of a 2 kg mass when it is moved from X to Y? A -8 kJ B -4 kJ C +8 kJ D +16kJ

JJC 2013 9646/JC2 Prelim Exam P1/2013 [Turn Over 14 A mains circuit contains six similar lamps connected in series. At least one of the lamps has a broken filament. Voltmeters X and Y of infinite resistance placed in the circuit show readings of 0 V and 240 V respectively. Which statement about the filaments of the lamps is correct? A Only filament 2 is broken. B Only filament 5 is broken. C Either filament 3 or filament 4 is broken. D Either filament 1 or filament 6 is broken. 15 A 10 V battery is connected to a 3.0  resistor. The battery has an internal resistance r and the power dissipated in each of the 3.0  resistor is 12 W. What is the value of the internal resistance r? A 0.50  B 1.0  C 2.0  D 3.0 

JJC 2013 9646/JC2 Prelim Exam P1/2013 [Turn Over 16 The diagram shows the relation between the current I in a circuit element and the potential difference V across it. Which statement about the circuit element is correct? A It does not obey Ohm’s law but when V > 1.8 V, its resistance is constant. B It does not obey Ohm’s law and when V > 1.8 V, its resistance is not constant. C It obeys Ohm’s law and when V > 1.8 V, its resi