NYGH 2012-S3-EOY-P2

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2012 Secondary Three PHYSICS 1 hour 45 minutes Paper 2 Theory Paper 10:00 – 11:45 Monday 15 October 2012 Additional materials: Calculators may 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 7, 8 and 9 Either or 9 Or. Write your answers in the spaces provided on the question paper. At the end of the examination, 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. Take the acceleration due to gravity, g, to be 10 m s-² or 10 N kg-1. Examiner’s Use Section A 1 2 3 4 5 6 Section B 7 8 9 Either 9 Or Total 70 Setters: TW, CMH & BN This document consists of 16 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over

2012 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Setters: TW, CMH & BN Physics II Section A Answer all questions. Write your answers in the spaces provided. 1 Three students set out to determine the average diameter of a marble using different methods. Method 1 Student A uses a micrometer screw gauge to measure the widest part of the marble. The reading is 10.92 mm. Method 2 Student B uses a pair of vernier callipers to measure widest part across 3 mutually perpendicular axis of one marble. The average of the 3 readings is 10.1 mm. . Method 3 Student C uses a ruler to measure the total length of 10 similar marbles arranged in a straight line. The total length is 10.1 cm and the average is 10.1 mm. (a) State one advantage of Method 1 over Methods 2 and 3. …………………………………………………………………………………………… ……………………………………………………………………………………….. [1] (b) Explain whether Method 2 or Method 3 is a more accurate method for determining the average diameter of the marble. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… ……………………………………………………………………………………….. [2] (c) The mass of the ten marbles used in Method 3 is weighed and their volume is measured. The following results are recorded. Mass = 17.7 g Volume = 6.9 cm 3 (i) Calculate the average weight of 1 marble. Weight = ……………………….. [1] metre rule

2012 End- of-Year Examination Secondary Three 3 Nanyang Girls’ High School Setters: TW, CMH & BN Physics II [Turn over (ii) Determine the average density of the marbles. Density = ……………………….. [2] 2 In Fig. 2, a ball of mass 420 g enters a smooth ramp with velocity v and rolls up the ramp to reach a maximum vertical height of 3.6 m. (a) State the main energy change of the ball. ……………………………………………………………………………………………. ……………………………………………………………………………………….. [1] (b) Calculate the work done by the ball in moving up the ramp. Work done = ……………………….. [2] (c) Calculate the velocity v of the ball as it enters the ramp. Velocity = ……………………….. [2] ramp 3.6 m v Fig. 2

2012 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School Setters: TW, CMH & BN Physics II (d) State and explain whether the velocity v calculated in (c) is likely to be greater or less than the actual velocity of the ball when it entered the ramp. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… ………………………………………………………………………………………. [2] 3 (a) Define a vector quantity. …………………………………………………………………………………………… …………………………………………………………………………………………… ……………………………………………………………………………………….. [1] (b) State the condition under which a resultant vector may be determined by simple addition or subtraction of vectors. …………………………………………………………………………………………… …………………………………………………………………………………………… ……………………………………………………………………………………….. [1] (c) Fig. 3 below shows a trap door AB of weight 150 N hinged at A. It is held open at an angle of 20º to the horizontal by a rope with a tension of 80 N. The rope is attached to B and makes an angle of 60º with the trap door at B. C A B 150 N 60º 20º Fig. 3 80 N rope

2012 End- of-Year Examination Secondary Three 5 Nanyang Girls’ High School Setters: TW, CMH & BN Physics II [Turn over (i) Using a scale diagram, determine the magnitude of the third force acting on the trap door. Scale: .............................. Magnitude of third force = ...................[3] (ii) Mark the position of the third force with an arrow on Fig. 3. Ignore the magnitude. [1]

2012 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School Setters: TW, CMH & BN Physics II 4 (a) One of the Laws of Reflection states that the angle of incidence is equal to the angle of reflection (i.e. i = r). State the other Law of Reflection. …………………………………………………………………………………………… ………………………………………………………………………………………. [1] (b) An object R is placed near to two mirrors M1 and M2 as shown in Fig. 4.1. Fig. 4.1 (i) Mark the positions of all the images of the object R formed by these two mirrors with an X in the space provided in Fig. 4.1. [2] (ii) A person stands at point E in Fig. 4.1 , and looks at the image of the object R that is the furthest distance away from the object. Draw the paths of a light rays travelling from object R to the person E that allow this person to see this image. [2] R E M1 M2

2012 End- of-Year Examination Secondary Three 7 Nanyang Girls’ High School Setters: TW, CMH & BN Physics II [Turn over (iii) A third mirror M3 is placed near the object R as shown in Fig 4.2. State the total number of images that will be formed of object R due to this arrangement of mirrors. Number of images = …………………………. [1] 5 Fig. 5.1 shows a ray of light passing through a lens. (a) State the name of this type of lens. ……………………………………………………………………………………….. [1] (b) Explain why light rays change direction as they enter the lens. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… ………………………………………………………………………………………. [2] Fig. 5.1 Fig. 4.2 R E M1 M3 M2

2012 End-of-Year Examination Secondary Three 8 Nanyang Girls’ High School Setters: TW, CMH & BN Physics II (c) Fig. 5.2 shows a word seen through a lens. Fig. 5.3 shows the same word without the l