ACJC H1 PHY P1

This paper consists of 13 printed pages Anglo-Chinese Junior College Physics Preliminary Examination Higher 1 PHYSICS Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 8866/01 30 Aug 2016 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your Name and Index number in the answer sheet provided. There are 30 questions in this section. 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 Question Paper.

2 2016 H1 8866 Prelim Exam P1 Data speed of light in free space, c = 3.00  108 m s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 acceleration of free fall, g = 9.81 m s2 Formulae uniformly accelerated motion, s = ut + 2 1 at 2 v 2 = u 2 + 2as work done on/by a gas, W = p V hydrostatic pressure, p =  g h resistors in series, R = R1 + R2 +  resistors in parallel, 1/R = 1/R1 + 1/R2 + 

3 2016 H1 8866 Prelim Exam P1 [Turn over 1 Which estimate is realistic? A The order of magnitude of the frequency of a Bluetooth signal is 109 Hz. B The acceleration of a Singapore MRT when moving off from a station is 10 m s-2. C The density of air at atmospheric pressure is 1.2 g cm-3. D The order of magnitude of pressure of air in a car tyre is 103 Pa. 2 When computing systematic and random errors, the following pairs of properties of errors in an experimental measurement may be obtained: X1: error can possibly be eliminated X2: error cannot possibly be eliminated Y1: error is of constant sign and magnitude Y2: error is of varying sign and magnitude Z1: error can be reduced by averaging repeated measurements Z2: error cannot be reduced by averaging repeated measurements Which properties apply to the random errors? A X1, Y1, Z2 B X1, Y2, Z2 C X2, Y2, Z1 D X2, Y1, Z1 3 In an experiment to determine the thickness of the glass of a boiling tube, the following readings were taken using a vernier caliper. Internal diameter, d1 = (2.064  0.004) cm External diameter, d2 = (2.560  0.004) cm The uncertainty in the thickness of the glass is A  0.002 cm B  0.004 cm C  0.008 cm D  0.016 cm 4 Which pair includes a vector quantity and a scalar quantity? A displacement, magnetic flux density B voltage, frequency C torque, work D spring constant, electric potential 5 A ball is dropped from a height of 20 m and rebounds with a speed which is 3 4 of the speed with which it hits the ground. (Assume that g is 10 m s-2). What is the time interval between the first and second bounce? A 2.0 s B 2.5 s C 3.0 s D 3.5 s

4 2016 H1 8866 Prelim Exam P1 6 Two stones, X and Y, of different mass are dropped from the top of a cliff. Stone Y is dropped a short time after stone X. Air resistance is negligible. Whilst the stones are falling, the distance between them will A decrease if the mass of Y is greater than the mass of X. B increase if the mass of X is greater than the mass of Y. C decrease whether the mass of X is greater or less than the mass of Y. D increase whether the mass of X is greater or less than the mass of Y. 7 The figure below shows the velocity vs time ( v - t) graph of an object. At time t = 0 s, the object’s displacement from the origin is 0 m. Which of the following best shows the corresponding displacement versus time (s - t) graph of the object? t/s 0 -2 3 2 4 6 v/m s-1 0 2 4 6 s 0 6 t/s 2 4 s t/s 0 2 4 6 s t/s 0 2 4 6 s A B C D t/s

5 2016 H1 8866 Prelim Exam P1 [Turn over force / N time / ms 150 40 8 An object is projected horizontally from a high platform with velocity 𝑣𝑜. The velocity with which it strikes the ground is 𝑣𝐴. If air resistance is neglected, the time of flight is A √𝑣𝐴 2 − 𝑣𝑜2 2𝑔 B √𝑣𝐴 2 − 𝑣𝑜2 𝑔 C 𝑣𝐴 − 𝑣𝑜 𝑔 D 𝑣𝑜 − 𝑣𝐴 𝑔 9 A tractor of mass 1000 kg pulls a trailer of mass 1000 kg. The total resistance to motion has a constant value of 4000 N. One quarter of this resistance acts on the trailer. When the acceleration of the tractor and trailer is 2 m s -2, the force exerted on the tractor by the trailer is A 1000 N B 2000 N C 3000 N D 5000 N 10 When a player serves a tennis ball of mass 0.060 kg, it is given an impulse of the form shown by the diagram. Assuming the tennis ball was moving normally to the racket at 5 .0 m s-1 just before the racket hits it, its speed, in m s-1, when it leaves the racket is A 45 B 50 C 55 D 95

6 2016 H1 8866 Prelim Exam P1 11 A car of mass 1000 kg moving at 5.0 m s -1 on an icy road collides with another car of mass 600 kg moving at 3.0 m s-1 in the opposite direction. After the collision, the lighter car moves off at 2.5 m s-1 in the initial direction of the heavier car. What is the speed of the heavier car after the collision? A 0.5 m s-1 B 1.7 m s-1 C 5.3 m s-1 D 8.3 m s-1 12 A pole of length 2 m has non-uniform composition, so that the centre of gravity is not at its geometrical centre. The pole is laid on supports across two weighing balances as shown in the diagram below. The balances (previously set to zero) recorded readin gs of 720 g and 480 g respectively. Where is the centre of gravity of the pole with respect to its geometrical centre? A 1 5 metre to the left B 1 5 metre to the right C 1 3 metre to the left D 1 3 metre to the right 13 A force of 1000 N is needed to lift the hook of a crane at a steady velocity. The hook is then used to lift a load of mass 1000 kg at a velocity of 0.50 m s-1. How much of the power developed, in kW, by the motor of the crane is used in lifting the load? A 4.9 B 5.0 C 5.4 D 5.5 2 m 720 g 480 g pole

7 2016 H1 8866 Prelim Exam P1 [Turn over 14 A small electric motor is used to raise a weight of 2.0 N at a constant speed of 20 cm s-1 through a certain height h. The efficiency of the motor is 20 %. What is the electrical power supplied to the motor? A 0.080 W B 0.80 W C 2.0 W D 200 W 15 A beam of positively charged particles is directed horizontally into vertical downward field of force. Which row shows the possible nature of the force acting on the beam with the correct shape of the beam? Force Shape of the beam A Gravitational Force Horizontal line B Electric Force Curve downwards C Gravitational Force Vertical line downwards D Electric Force Vertical line downwards 16 A gas is contained inside a sealed syringe as shown. The volume of gas at room temperature is 2.0 cm3. Atmospheric pressure is 101 kPa. What is the work done by the gas when it is heated and expands to a volume of 6.0 cm3? A 404 μJ B 404 mJ C 404 J D 404 kJ h 20 cm s-1

8 2016 H1 8866 Prelim Exam P1 17 A ball is released from rest. It falls vertically, hits the ground and bounces back up. Energy losses are negligible. Which graph shows how the gravitational potential energy of the ball change