2013 PJC H2 Physics P1

2013/PJC/PHYSICS/9646 [Turn over PIONEER JUNIOR COLLEGE JC2 Preliminary Examination PHYSICS 9646/01 Higher 2 Paper 1 Multiple Choice 27 September 2013 1 hour 15 minutes Additional Material: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST 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 document consists of 18 printed pages. Name Class Index Number

2 2013/PJC/PHYSICS/9646 Data speed of light in free space, 81000.3 c ms –1 permeability of free space, 7 0 104   Hm–1 permittivity of free space, 12 0 1085.8  Fm–1    910361   Fm–1 elementary charge, 191060.1 e C the Planck constant, 341063.6 h Js unified atomic mass constant, 271066.1 u kg rest mass of electron, 311011.9 em kg rest mass of proton, 271067.1 pm kg molar gas constant, 31.8R JK–1 mol–1 the Avogadro constant, 231002.6 AN mol–1 the Boltzmann constant, 231038.1 k JK–1 gravitational constant, 111067.6 G Nm2 kg–2 acceleration of free fall, 81 .9g ms –2

3 2013/PJC/PHYSICS/9646 [Turn over Formulae uniformly accelerated motion, 2 2 1 atuts  asuv 222  work done on/by a gas, VpW  hydrostatic pressure, ghp  gravitational potential, r Gm displacement of particle in s.h.m., txx sin0 velocity of particle in s.h.m., tvv cos0 22 0 xx   mean kinetic energy of a molecule kTE 2 3 of an ideal gas, resistors in series, ...21  RRR resistors in parallel, .../1/1/1 21  RRR electric potential, r QV 04 alternating current/voltage, txx sin0 transmission coefficient,  kdT 2exp  where  2 28 h EUmk   radioactive decay, )exp(0 txx  decay constant, 2 1 693.0 t

4 2013/PJC/PHYSICS/9646 1 What are the SI base units of magnetic flux density? A kg ms −2 A−1 B kg m 2 s−2 A−1 C kg s −2 A−1 rad−1 D kg s −2 A−1 2 A boat changes its velocity from 5 m s−1 due East to 7 m s−1 due South. What is its change in velocity? A 9 m s −1 at a direction of 54° South of East B 9 m s−1 at a direction of 54° South of West C 2 m s−1 at a direction of 36° East of South D 2 m s−1 at a direction of 36° West of South 3 The acceleration-time graph of an object moving in a straight line is as shown. If the object starts its motion from rest, at which point is the object moving with the largest speed? A P B Q C R D S 4 An athlete throws a javelin at an angle of 60° to the horizontal. The javelin leaves the athlete’s hand with an initial kinetic energy, E. Neglecting air resistance, the javelin’s kinetic energy at its highest point of motion is A zero. B 1 4 E . C 3 4 E . D E. P Q R S time acceleration 0

5 2013/PJC/PHYSICS/9646 [Turn over 5 Which body is in equilibrium? A A satellite moving around the Earth in a circular orbit. B A car rolling down a frictionless inclined plane. C An apple falling freely towards the surface of Earth. D A block sliding at constant velocity across a tabletop. 6 A mass of 2.0 kg is at rest on a smooth floor. A horizontal stream of water, travelling at speed 8.0 m s1, strikes it at a rate of 1.0 kg s1 for a duration of 50 s without splashing. What is the initial acceleration of the mass? A 0.080 m s 2 B 0.16 m s 2 C 4.0 m s 2 D 8.0 m s 2 7 A barge is floating in seawater of density 1030 kg m 3. The area of the horizontal cross- section of barge is 97 m 2 and the sides of the barge are vertical. The flat-bottom of the barge is 70 cm under seawater when it is loaded with 2.0  104 kg of cargo. How deep is the bottom of the barge below the water surface when the cargo is unloaded off the barge? A 20 cm B 50 cm C 70 cm D 90 cm 8 A spring obeying Hooke’s law has an unstretched length of 60 mm and a spring constant of 500 N m1. What is the tension in the spring when its overall length is 90 mm? A 15 N B 45 N C 150 N D 450 N

6 2013/PJC/PHYSICS/9646 9 A bullet moving with a speed of 150 m s 1 strikes a wooden plank. After passing through the plank, its speed becomes 125 m s 1. Another identical bullet strikes the plank with a speed of 90 m s1. What is its speed after passing through the plank if the bullets experience the same constant retarding force in both cases? A 25 m s1 B 35 m s1 C 50 m s 1 D 70 m s 1 10 A force F of 80 N pulls an object of weight 40 N from rest up an incline of 30  through 3.0 m as shown below. The frictional force present is 30 N. Which of the following correctly gives the heat generated due to friction and the gain in kinetic energy of the mass? 11 Two identical particles P and Q are set to travel in a circular path of the same radius. P moves in a vertical circle and Q moves in a horizontal circle. Both move with the same uniform speed. Which of the following statements concerning the magnitude of the net force acting on P and Q towards the centre of the circular path is true? A Both net forces on P and Q vary with time and are never equal in magnitude. B Both net forces on P and Q vary with time and are equal in magnitude periodically. C The net forces on P and Q are always equal in magnitude. D The magnitude of the net force on P is always larger than that on Q. heat / J gain in kinetic energy / J A 210 0 B 90 90 C 90 30 D 210 240 30° 3.0 m F

7 2013/PJC/PHYSICS/9646 [Turn over 12 A mass m1 is attached to one end of an elastic string of an unstretched length L. When the mass is rotating with a linear speed v on a smooth table in a horizontal circle, an extension e is obtained. Which of the following shows the correct expression for mass m2, if it is rotated with the same linear speed v but rotates at twice the radius as that produced by m1? A 1 2 2( 2 )mL em e  B 1 2 2( )mL em e  C 1 2 2( 2 )mL em e  D 1 2 2( 2 2 )mL em e  13 The gravitational force on an object at the top of Mount Fuji, with an elevation of 3776 m, is 40 N. What would be the approximate gravitational force on the same object if it were taken to another mountain with twice the elevation? A 10 N B 20 N C 30 N D 40 N 14 The planet Venus has a mass 0.8 times that of Earth and a diameter 0.9 times that of Earth. Taking the acceleration due to gravity at the Earth’s surface to be 9.81 2ms , what is the acceleration due to gravity at the surface of Venus? A 8.7 2ms B 9.7 2ms C 17 2ms D 39 2ms

8 2013/PJC/PHYSICS/9646 15 Which one of the following statements about a simple harmonic oscillator is incorrect? A The total energy of the oscillator is constant throughout the motion. B The kinetic energy of the oscillator is maximum when it is at equilibrium position. C The poten