TJC H1 PHY P1

READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, Civics group and Index Number on the Answer Sheet in the spaces provided. There are thirty questions in 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. The use of an approved scientific calculator is expected, where appropriate. This booklet consists of 16 printed pages. [Turn over TEMASEK JUNIOR COLLEGE 2016 Preliminary Examination Higher 1 PHYSICS Paper 1 Multiple Choice 8866/01 20 September 2016 1 hour Additional Materials: Multiple Choice Answer Sheet

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 + ½at2 v2 = u2 + 2as work done on/by a gas, W = p∆V hydrostatic pressure, p = ρgh resistors in series, R = R1 + R2 + … resistors in parallel, 1/ R =1 / R1 + 1/R2 + …

3 1 The behaviour of many real gases can be represented by an equation of the form (p + ) 2 mV a (Vm – b) = RT where p is pressure, Vm is volume per mole, T is temperature, R is a constant, and the values of a and b are characteristics of the particular gas. What are the units of a and b? a b A Pa m-6 mol2 m3 mol B Pa m6 mol-2 m3 mol C Pa m-6 mol2 m3 mol-1 D Pa m6 mol-2 m3 mol-1 2 A plastic ruler is used to measure the thickness of a block whose thickness is 7.5 cm. Repeated measurements give the following readings. Thickness/ cm 7.6 7.5 7.8 7.4 7.6 Which of the following is correct? results are accurate to within 0.1 cm results are precise to within 0.1 cm A Yes No B Yes Yes C No Yes D No No 3 Which of the following statements is correct? A In the measurement of the diameter of a sphere, take more readings and finding the average value of these readings will help to reduce the fractional uncertainty of the diameter. B Plotting a graph of voltage and current readings for an ohmic conductor and using its gradient to find resistance will help to eliminate random error. C Measuring the timing of a larger number of oscillations will help to reduce the fractional uncertainty of the period. D Checking for zero error on a voltmeter before measuring voltage will help to reduce random error.

4 4 The acceleration of free fall, g, can be determined using the equation for the period T of a simple pendulum of length L given by T = 2 g L If the length of the pendulum is measured to be L = (0.500 ± 0.001) m, and the period is measured to be T = (1.42 ± 0.02) s, what should the student record as the value of g? A (9.8 ± 0.3) m s-2 B (9.79 ± 0.03) m s-2 C (9.79 ± 0.30) m s-2 D (9.789 ± 0.295) m s-2 5 The figure below shows the trajectory of a tennis ball crossing the net and bouncing once from the ground. Which of the following graphs represents the variation with the horizontal distance from point P of the acceleration a of the ball, taking the upward direction as positive?

5 6 A body is thrown vertically upwards in a medium in which the viscous drag cannot be neglected. If the times of flight for the upward motion tu and the downward motion td to return to the same level are compared, then A td > tu, because the body moves faster on its downward flight and therefore the viscous force is greater. B td > tu, because at a given speed the net accelerating force when the body is moving downwards is smaller than the retarding force when it is moving upwards. C td < tu, because the effect of the viscous force is the greatest at the moment of projection. D td = tu, because the effect of the viscous force is the same whether the body is moving upwards or downwards. 7 Ball X of mass m is projected with a speed of u at point O at an angle of  above the ground. It reaches its maximum height when its horizontal displacement is d. Another ball Y of mass 2 m is projected with a speed of 2 u from O at the same angle  above the horizontal. What is the horizontal displacement of ball Y when it reaches its maximum height? Ignore air resistance. A d B between d and 2d C 2d D further than 2d  u d O

6 8 Two springs of equal unstretched lengths but different spring constants are subjected to a variable force. The force-extension graphs of both springs are shown in the following diagram. The springs are then joined in parallel and subjected to the same variable force. Which of the other lines in the grid would represent the new force-extension graph of the two springs joined in parallel? spring 1 spring 2 A B C D force extension 0 0

7 9 A uniform block rests on a smooth inclined plane, supported by a force F to prevent it from moving. Which of the following diagrams correctly shows the force R exerted by the inclined plane on the block?     F inclined plane F R A F R B F R C F R D

8 10 An object is projected up a long smooth inclined plane as shown in the diagram. Which graph best shows the variation of the momentum p of the object along the slope with time t? 11 A ball of smaller mass m travelling at 6.0 m s -1 collides elastically with a ball of larger mass M travelling at 1.0 m s-1. Which diagram represents the velocities of the two balls after the collision? A B C D

9 12 Two balls X and Y are dropped from a very tall building. Both balls reach terminal velocity before hitting the ground. The balls have the same diameter. The mass of X is greater than the mass of Y. Which statement is correct? A The balls hit the ground at the same time. B The terminal velocity of Y is greater than that of X. C The initial acceleration of both balls is the same. D The balls have the same kinetic energy just before hitting the ground. 13 The diagram shows a tall water-filled tower used for training divers. Which of the following gives the rate of change of pressure with depth in this tower? A 1.0 Pa m-1 B 10 Pa m-1 C 1.0 x 103 Pa m-1 D 1.0 x 104 Pa m-1 diver

10 14 A soccer player hits a ball so that it leaves the ground at an angle of 45o to the horizontal. Which graph represents the variation of kinetic energy and of gravitational potential energy with time of the ball during the time of flight? Assume that air resistance can be ignored. 15 A block of weight W rests on a rough slope of dimensions, x, y and z as shown. A force F pushes the block all the way up the slope. The block starts and finishes at rest. How much work is done by the force F? . A Wy B Wy + Fz C Wz D Fz