VJC H1 PHY P1

1     VICTORIA JUNIOR COLLEGE 2016 JC2 PRELIMINARY EXAMINATIONS    PHYSICS Higher 1 Paper 1 Multiple Choice   Additional Materials: Multiple Choice Answer Sheet 8866/01 22 Sep 2016 Thursday 1 Hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, CT group and index number on the Answer Sheet in the spaces provided. There are thirty 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 14 printed pages.

2   Data speed of light in free space, c = 3.00 x 10 8 m s-1 elementary charge, e = 1.60 x 10-19 C the Planck constant, h = 6.63 x 10-34 J s unified atomic mass constant, u = 1.66 x 10-27 kg rest mass of electron, me = 9.11 x 10-31 kg rest mass of proton, mp = 1.67 x 10-27 kg acceleration of free fall, g = 9.81 m s-2 Formulae uniformly accelerated motion, s = ut + (½) at 2 v2 = u2 + 2as work done on/by a gas, W = pV hydrostatic pressure, p = hg resistors in series, R = R1 + R2 + … resistors in parallel, 1/R = 1/R1 + 1/R2+ …

3   1 A power station generates power of 3.0 GW. What is the energy produced for a time interval of 2.0 ps? A 6.0 x 10-15 TJ B 6.0 x 10-6 MJ C 6.0 x 103 nJ D 6.0 x 106 J 2 The perpendicular sides of a right angle triangle have lengths (9.0 ± 0.2) cm and (7.0 ± 0.2) cm. The length of the hypotenuse is calculated from these two measurements. What is the uncertainty of the length of the hypotenuse? A ± 0.2 cm B ± 0.3 cm C ± 0.4 cm D ± 0.5 cm 3 Ah Seng wanted to measure the period of a pendulum, but he did not have a stopwatch. So he used a wall clock instead. He noted the start time for 20 oscillations to be (12.0 ± 0.5) s, and the stop time to be (57.0 ± 0.5) s. What is the period of the pendulum? A (2.25 ± 0.03) s B (2.25 ± 0.05) s C (2.3 ± 0.5) s D (2 ± 1) s 4 A ball is released from point P, and bounces once on the floor. Which of the following graphs correctly shows how its velocity v varies with displacement s with respect to P? A B C D 5 A stone is thrown at a velocity of 12 m s -1 at an angle of 25o above the horizontal. What is the magnitude of the change in velocity from its starting point to the highest point in its path? A 1.1 m s-1 B 5.1 m s-1 C 5.8 m s-1 D 12 m s-1 v 0 s v 0 s v 0 s v 0 s

4   6 Ash was trying to catch a pokemon when he accidentally jumped off a cliff with a velocity of 8.50 m s-1 at an angle of 40.0o above the horizontal. The cliff has a height of 15.0 m. How long does it take before he ‘reaches’ the bottom of the cliff? A 1.28 s B 2.39 s C 2.53 s D 2.81 s 7 A uniform rod has a steel section and a solid rubber handle, as shown. The length of the handle is l and the length of the steel section is 3.00 l. The rod balances a distance 1.60l from the steel end. What is the rubber ofdensity steel ofdensity ? A 0.158 B 1.90 C 3.00 D 6.33 8 Equal and opposite forces of magnitude F are applied to the ends of a ruler of length L, creating a couple as shown in the diagram. What is the torque of the couple on the ruler when it is in the position shown? A FL cos  B FL sin C 2FL cos D 2FL sin 1.00l  3.00l  1.60l  rubber handle  steel section  F  F    

5   9 A helicopter rises vertically with a constant speed. According to Newton’s third law, the reaction force to the weight of the helicopter is A the lift force created by the engine of the helicopter. B the gravitational force on the Earth due to the helicopter. C the air resistance on the helicopter as it rises up. D the upthrust acting on the helicopter due to air around it. 10 Particle X has a mass m and particle Y has a mass 3m. They travel at equal speed v but in opposite direction along a smooth horizontal surface, and then collide head-on elastically. Which of the following statements is false? A The total kinetic energy of the system consisting of the two particles is not conserved throughout the duration of the collision. B The total energy of the system consisti ng of the two particles is conserved throughout the duration of the collision. C The total momentum of the system consisting of the two particles is always conserved except during time of collision due to the presence of collision forces between the two particles. D The relative speed of separation after the collision is 2 v.

6   11 The graph in Fig 11 shows how the force F acting on a car varies with time t while it is traveling for 50 s. The mass of the car is 1000 kg. What is the velocity of the car at t = 50 s if it had an initial velocity of 10 m s -1 at t = 0 s? A 10.8 m s -1 B 22.5 m s-1 C 32.5 m s-1 D 55.0 m s-1 12 An object of weight 50 N is dragged up an inclined plane at constant speed of 5.0 m s -1, through a vertical height of 12 m. The total work done is 1500 J. The work done against friction is A 600 J B 840 J C 900 J D 1500 J 13 A speed-boat with two engines, each of power output 30 kW, can travel at a maximum speed of 10 m s -1. The total drag D on the boat is related to the speed v of the boat by the equation shown. 2vD  What is the maximum speed of the boat when only one engine is working? A 2.5 m s-1 B 5.0 m s-1 C 7.1 m s-1 D 7.9 m s-1 F / N   t / s0  10  20 30 40 50  500 1000  1500  2000  ‐500 ‐1000  ‐1500  ‐2000  Fig 11

7   14 An electric railway locomotive has a maximum mechanical output power of 4.0 MW. Electrical power is delivered at 25 kV from overhead wires. The overall efficiency of the locomotive in converting electrical power to mechanical power is 80%. What is the current from the overhead wires when the locomotive is operating at its maximum power? A 130 A B 160 A C 200 A D 250 A 15 A string is held horizontally with one end attached to a fixed support. Two pulses are created at the free end of the string. The pulses are moving towards the fixed support as shown in the diagram below. Which one of the following diagrams is a possible subsequent picture of the string? A B C D

8   16 A beam of unpolarised light with amplitude A and intensity I is passed through two optical polarisers. The first polariser’s transmission axis is oriented at 60° to the vertical, while the second polariser’s transmission axis is oriented at 45° to the horizontal. What is the intensity of the light at P and amplitude of the light at Q? Intensity of light at P Amplitude of light at Q A I 2 1 15A2 1 sin B I 2 1 15Acos2 1 C I2 1 15Acos 2 1 D I2 1 15sin 2 1 A 17 A point source of sound emits energy equally in all directions at a constant rate and a detector placed 3.0 m from the source measures an intensity of 5.0 W m -2. The amplitude at the source is then doubled. What intensity, in W m -2, would the detector measure if it is now placed at a distance 4.0 m from the source? A 0.45 B 0.56 C 11 D 15

9   18 A sound wave of constant wavelength is continuously transmitted into an air column. The length l of the air column is slowly increased from zero. When l reaches certain values, the sound heard from the air column increases