NYGH 2011-S3-EOY-Phy-P2

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2011 Secondary Three PHYSICS Paper 2 Theory Paper 1 hour 45 minutes Monday 17 October 2011 1000 - 1145 Additional materials: Calculator can be used 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. 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 including questions 8, 9 and 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. The gravitational field strength near Earth’s surface, g = 10 N/kg Examiner’s Use Section A 1 2 3 4 5 6 7 Section B 8 9 10 Either 10 Or Total 70 Setters: AJL, BN, TWL This document consists of 18 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over

2011 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School This is a blank page AJL, BN, TWL Physics / II

2011 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School Section A Answer all questions. Write your answers in the spaces provided. 1 Fig. 1.1 shows the velocity-time graph of an object. Fig. 1.1 (a) Calculate the displacement of the object from t = 0.0 s to t = 3.0 s. displacement = .............................. [1] (b) Calculate the displacement of the object from t = 0.0 s to t = 10.0 s. displacement = .............................. [1] (c) Using the axes below, sketch the displacement-time graph for the object, labelling the axes, and other relevant information, clearly. [3] AJL, BN, TWL Physics / II [Turn over

2011 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School 2 A man is standing in a lift which is travelling upwards at a constant speed of 5.0 m/s. The mass of the man is 65 kg, while the mass of the lift is 435 kg. 5.0 m/s (a) State the magnitude of the net force acting on the man. Explain your answer with reference to Newton’s Laws of Motion. ….………………………………………………………………………………………....... ….………………………………………………………………………………………....... ....………………………………………………………………………………………… [2] (b) In the space below, draw a free-body diagram of the forces acting on the man, clearly labelling each force and stating its magnitude. [ 2 ] (c) Suppose the lift is now travelling downwards at a constant speed of 10.0 m/s instead. State how the forces acting on the man as drawn in part (b) may change. Explain your reasoning clearly. ….………………………………………………………………………………………....... ….………………………………………………………………………………………....... ….………………………………………………………………………………………....... ....………………………………………………………………………………………… [2] AJL, BN, TWL Physics / II

2011 End-of-Year Examination Secondary Three 5 Nanyang Girls’ High School 3 (a) The diagram below shows the rest position (Fig. 3.1) and the displaced position (Fig. 3.2) of a toy. The toy always returns to its rest position after being displaced. Fig. 3.1 Fig. 3.2 (i) Mark, with a cross, the centre of gravity of the toy in Fig. 3.2. [1] (ii) Describe what happens after the toy is released from the displaced position (Fig. 3.2). Explain your reasoning clearly. .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... .......................................................................................................................... ..................................................................................................................... [3] (b) Explain why the toy is able to stay at rest in the position shown in Fig. 3.1. ................................................................................................................................... ................................................................................................................................... .................................................................................................................................. ............................................................................................................................... [2] AJL, BN, TWL Physics / II [Turn over

2011 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School 4 Fig. 4.1 shows a section of a roller coaster. The mass of the cart and its passengers is 400 kg. The speed of the cart at L is 20 m/s. Assume that the tracks are frictionless and do not do work on the cart. Fig. 4.1 (a) Calculate the gravitational potential energy gained by the cart when it travels from L to the highest point, H. gravitational potential energy gained = .............................. [1] (b) Calculate the kinetic energy of the cart when it reaches the highest point, H. kinetic energy at H = .............................. [2] (c) Calculate the speed of the cart at the highest point, H. speed of cart at H = .............................. [2] AJL, BN, TWL Physics / II

2011 End-of-Year Examination Secondary Three 7 Nanyang Girls’ High School 5 Fig. 5.1 shows the top view of an arrangement where a plane mirror is used in a shop to observe a display counter behind a wall. P is the position of the observer’s eye. P wall plane mirror display counter Q Fig. 5.1 (a) The corner Q of the display counter can be seen at P via the plane mirror. By drawing just one incident light ray from Q, show the path of the reflected light that reaches P. Locate and label the image of Q in the mirror with the letter R. [2] (b) On Fig. 5.1 above, draw light rays accurately to show how much of the display counter cannot be seen from P. Label the part of the counter that cannot be seen with AB. [2] (c) The plane mirror has to be extended in order for the whole disp lay counter to be seen from P. By drawing light rays on Fig. 5.1 , indicate the minimum extended length of mirror required to do this. Label this mirror extension with CD. [2] AJL, BN, TWL Physics / II [Turn over

2011 End-of-Year Examination Secondary Three 8 Nanyang Girls’ High School 6 (a) State two conditions for total internal reflection to occur. ………………………………………………………………………………….....……....... ………………………………………………………………………………….....……....... ………………………………………………………………………………….....…...….... ………………………………………………………………………………….....…...….... ………………………………………………………………………………………...... [2] (b) Fig. 6.1 shows the refraction of a light ray passing from liquid X to air. 28º Normal 48º air liquid X Fig. 6.1 (i) Calculate the refractive index of the liquid X. refractive index = ……………………….. [2] (ii) Calculate the critical angle for the liquid X . critical angle = ……………………….. [2] (iii) Suggest one reason why the refracted