NYGH 2016-S3EOY-Physics P2

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2016 Secondary Three PHYSICS 1 hour 45 minutes Paper 2 Theory Paper 10:00 – 11:45 Monday 10 October 2016 No additional materials are required. READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write your name, register number and class in the spaces at the top of this page and on any separate answer paper used. Write in dark blue or black ink. You may use a pencil for any diagrams or graphs. Do not use correction fluid or tape. Section A (40 marks) Answer all questions. Write your answers in the spaces provided on the question paper. Section B (30 marks) Answer all questions. Question 10 has a choice of parts to answer: 10 Either or 10 Or. Write your answers in the spaces provided on the question paper. At the end of the examination, circle 10 Either or 10 Or in the grid on the right to indicate which question you have answered. INFORMATION FOR CANDIDATES The intended number of marks is given in the brackets [ ] at the end of each question or part question. You are advised to spend no longer than one hour on Section A and no longer than 45 minutes on Section B. Candidates are reminded that all quantitative answers should include appropriate units. Candidates are advised to show all their working in a clear and orderly manner, as more marks are awarded for sound use of Physics than for correct answers. The use of an approved scientific calculator is expected, where appropriate. The acceleration due to gravity (or gravitational field strength) g is taken to be 10 m s -2 (or 10 N kg-1) near the Earth’s surface. Examiner’s Use Section A (40 marks) 1 2 3 4 5 6 7 Section B (30 marks) 8 9 10 Either 10 Or Paper 2 (70 marks) Paper 1 (30 marks) Overall % Setters: AWL & TBH This document consists of 17 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over

2016 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Setters: AWL & TBH Physics II Section A (40 marks) Answer all questions. Write your answers in the spaces provided. 1 A student checks the purity of a small un iform aluminium block by measuring its density. He first recorded the dimensions of the block as follows: Height/ cm Breadth / cm Length/ cm 1st reading 2.25 1.92 2.05 2nd reading 2.23 1.90 2.04 Average 2.24 1.91 2.045 (a) Name the instrument that the student used. [1] (b) State one error that the student made in the tabulation of his results. [1] (c) He then went on to measure the mass of the block as 23.9 g and the weight of the block as 0.236 N. (i) Determine the gravitational field strength where the measurements were made. gravitational field strength = [1] (ii) Calculate the density of the block. density of block = [3]

2016 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School Setters: AWL & TBH Physics II 2 A boy threw a ball upwards vertically at a velocity of 16.0 m s -1. The ball reaches its maximum height and then falls freely under gravity, hitting the ground 4.0 s after it left the boy’s hand. (a) Calculate the time it takes for the ball to reach its maximum height. time taken = [2] (b) Determine the velocity of the ball when it hits the ground. velocity = [2] (c) Assume upwards as the positive direction. Sketch (i) the velocity-time graph, and (ii) the corresponding displacement-time graph over the 4.0 s interval. Label the key values on each graph. [4] time / s time / s displacement / m velocity / m s-1

2016 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School Setters: AWL & TBH Physics II 3 Fig. 3.1 shows a ball that starts from rest at R, rolls down a smooth ramp to S and then rolls over a furry carpet. (a) State the principle of conservation of energy. [2] (b) The mass of the ball is 450 g. Calculate the loss in gravitational potential energy between R and S. loss in gravitational potential energy = [3] (c) Determine the speed of the ball when it reaches point S. speed of ball = [2] R S 1.20 m 1.44 m Fig. 3.1 furry carpet

2016 End-of-Year Examination Secondary Three 5 Nanyang Girls’ High School Setters: AWL & TBH Physics II (d) The ball comes to rest after rolling for a short distance on the carpet. Explain if the law of conservation of energy still applies in this case. [1] 4 Fig. 4.1 below shows a balancing toy made from a flat piece of cardboard paper cut- out with two small lumps of plasticine of equal mass affixed at X and Z. Fig. 4.1 It is balanced on a stand at Y. (a) Explain the effect of the two lumps of plasticine on the stability of the toy. [2] cardboard plasticine stand X Z Y

2016 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School Setters: AWL & TBH Physics II A force acting at Z causes the cardboard to be tilted as shown in Fig. 4.2. Fig. 4.2 (b) Describe and explain what happens to the toy when the force acting on Z is removed. [2] force X Z Y

2016 End-of-Year Examination Secondary Three 7 Nanyang Girls’ High School Setters: AWL & TBH Physics II 5 (a) State the two laws of reflection. [2] (b) In Fig. 5.1 below, the vertical arrow represents a 1.60 m tall girl standing 2.00 m in front of a mirror. Her eyes are at a height of 1.50 m from the ground. (i) Draw rays on Fig. 5.1 to show how the girl can see her full image in the mirror. [2] (ii) Determine the minimum length of the mirror that will allow the girl to see her full image. Show your working clearly. minimum length of mirror = [2] (iii) Determine the height above the ground that the minimum length mirror must be positioned in order for the girl to see her whole image. height of mirror above the ground = [1] Fig. 5.1 1.50 m 2.00 m head eyes

2016 End-of-Year Examination Secondary Three 8 Nanyang Girls’ High School Setters: AWL & TBH Physics II 6 A kite of mass 0.25 kg is flying at constant velocity of 0.12 m s -1 in the sky. The force of the wind can be seen as a single force of 7.4 N acting at an angle of 30  to the horizontal as shown in Fig. 6.1. Fig. 6.1 By means of a scale diagram, determine the magnitude of the tension in the string that is pulling the kite. magnitude of tension = [3] 30 wind string

2016 End-of-Year Examination Secondary Three 9 Nanyang Girls’ High School Setters: AWL & TBH Physics II 7 Fig 7.1 below shows a rubber party balloon that has been filled with helium gas. Fig. 7.1 When the balloon is released from the ground, it rises up in the air . (a) State and explain how the volume of the balloon will change as it rises up in the atmosphere. [2] (b) A balloon has a volume of 4.2 × 10 -6 m3 at sea level. Calculate the volume of the balloon at an altitude where the pressure inside it is 0.30 times the atmospheric pressure. volume = [2]

2016 End-of-Year Examination Secondary Three 10 Nanyang Girls’ High School Setters: AWL & TBH Physics II Section B (30 marks) Answer