NYGH 2018-S3EOY-Physics P2

Class Register Number Name 南洋⼥女女⼦子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2018 Secondary Three PHYSICS 1 hour 45 minutes Paper 2 Theory Paper 10:00 – 11:45 Tuesday 9 October 2018 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 9 has a choice of parts to answer: 9 Either or 9 Or. Write your answers in the spaces provided on the question paper. Circle 9 Either or 9 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 Section B (30 marks) 7 8 9 Either 9 Or Paper 2 (70 marks) Paper 1 (30 marks) Overall % This document consists of 17 printed pages and 1 blank page. Setters: TW & HWQ NANYANG GIRLS’ HIGH SCHOOL [Turn over

2018 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Setters: TW & HWQ Physics II Section A (40 marks) Answer all questions. 1 A company buys corrugated cardboard to make boxes. The cardboards are bundled up as shown in Fig. 1.1. Fig. 1.1 (a) Each bundle of cardboards has a mass of 8.4 kg and dimensions 15.5 cm by 60.2 cm by 41.8 cm. (i) Name the instrument used to measure the dimensions of the cardboard and state its precision. instrument = ………………………….…. precision = ……………………..[2] (ii) Calculate the volume of the bundle of cardboards. volume = ……………………..[1] 60.2 cm 41.8 cm 15.5 cm

2018 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School Setters: TW & HWQ Physics II [Turn over (iii) Calculate the density of the corrugated cardboard in S.I. units. density = ……..……….………..[2] (b) Corrugated cardboard is made up of three sheets of thick paper stuck together. Fig. 1.2 shows an enlarged view of the edge of a sheet of corrugated cardboard. Fig. 1.2 State and explain whether the density of the paper is greater, the same or lower than the average density of the corrugated cardboard. ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… …………………………………………………………………………………………... [2] thick paper air

2018 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School Setters: TW & HWQ Physics II 2 Fig. 2.1 shows a “tower drop” theme park ride. The passengers on the gondola are lifted to a height and then dropped. Fig. 2.1 The graph in Fig. 2.2 shows how the velocity of the gondola changes with time during the ride. Fig. 2.2 gondola Source: https://www.tripadvisor.co.uk/LocationPhotoDirectLink-g551774-d673946-i106562587-M_D_s_Scotlands_Theme_Park-Motherwell_North_Lanarkshire_Scotland.html velocity / m s -1 8.0 4.0 0.0 - 4.0 - 8.0 - 12.0 - 16.0 - 20.0 - 24.0 20.0 10.0 30.0 time / s 40.0

2018 End-of-Year Examination Secondary Three 5 Nanyang Girls’ High School Setters: TW & HWQ Physics II [Turn over (a) Define the term velocity. ……………………………………………………………………………………………… ……………………………………………………………………………………………… …………………………………………………………………………………………... [1] (b) State and justify whether the passengers on the gondola experience free-fall during the drop. ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… …………………………………………………………………………………………... [2] (c) At 4.0 s, a passenger on the gondola dropped a key. (i) State the initial velocity of the key. velocity = ……………………………. [1] (ii) Determine the time it takes for the key to fall to the ground. time = ……………………………. [3] (iii) Sketch on Fig. 2.2, the velocity-time graph of the key from 4.0 s until it hits the ground. [2]

2018 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School Setters: TW & HWQ Physics II 3 (a) State the difference between a scalar and a vector quantity. …………………………………………………………………………………………….. …………………………………………………………………………………………….. ………………..………………………………………………………….……………...[1] (b) Force is a vector quantity. State one other example of a vector quantity. ………………..………………………………………………………….……………...[1] (c) Fig. 3.1 shows the top of a flagpole. The flagpole is held vertical by two ropes X and Y. Fig. 3.1 A force of 120 N acts on rope X at an angle of 60o to the flagpole. The resultant force of magnitude 350 N acts vertically downward on the pole. In the space below, draw a scaled diagram to find the magnitude of the force F on the rope Y and the angle that rope Y makes with the vertical. State the scale used. scale used = …………………………….[1] F = ………..…..……… [2] angle = ………………..[1] rope X 120 N rope Y flagpole F 60o

2018 End-of-Year Examination Secondary Three 7 Nanyang Girls’ High School Setters: TW & HWQ Physics II [Turn over (d) State two changes that can be made to rope X to increase the force F in rope Y, without changing the magnitude and direction of the resultant force. (i) ……………..………………………………………………………….……………...... (ii)………………………………………………………………………………………..[2] 4 Fig. 4.1 shows a balancing toy bird. The bird is made of wood and it has a metal piece stuck to its tail. When placed on a rod, the toy balances in equilibrium at the position shown in Fig. 4.1. Fig. 4.1 Fig. 4.2 (a) On Fig. 4.1, mark with a cross and label with the letter G, a possible position for the centre of gravity of the toy. [1] (b) The metal piece falls off the tail as shown in Fig. 4.2. (i) Two points (P and Q) are marked with crosses on Fig. 4.2. State and explain which point (P or Q) is likely to be the centre of gravity of the toy without the metal piece. ……...………….……………….…………………………………………………… ……...………….……………….…………………………………………………[1] (ii) State and explain what happens to the toy immediately after the metal piece falls off. ……...………….……………….…………………………………………………… ……...………….……………….…………………………………………………… ……...………….……………….…………………………………………………… ……...………….……………….…………………………………………………[2] rod metal piece rod × × × P Q

2018 End-of-Year Examination Secondary Three 8 Nanyang Girls’ High School Setters: TW & HWQ Physics II 5 A manometer is filled with oil, water and mercury as shown in Fig. 5.1. Atmospheric pressure = 1.00 × 105 Pa Density of mercury = 1.36 × 104 kg m−3 Density of water = 1.00 × 103 kg m−3 Fig. 5.1 (a) Determine the density of the oil. density of oil = ……………………………. [2] (b) The oil in Fig. 5.1 is replaced with alcohol of the same volume, which is less dense th