NYGH 2010-S3-EOY-Phy-P2

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2010 Secondary Three PHYSICS 1 hour 45 minutes Paper 2 Theory Paper 1000 - 1145 Monday 18 October 2010 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. Write your answers in the spaces provided. Assume g = 10 m/s 2, unless specified otherwise by the questions. INFORMATION FOR CANDIDATES Examiner’s Use Section A Section B 10 11 12 Total 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. Setters: TLH / MS / TBH This document consists of 17 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over

2010 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Section A Answer all questions. Write your answers in the spaces provided. 1 Fig. 1.1 shows a cube of dimensions 2.0 cm, 3.0 cm and 4.0 cm. 2.0 cm 4.0 cm 3.0 cm Fig. 1.1 (a) Given the mass of the cube to be 36 g, calculate the density of the cube. [2] (b) The cube sinks when placed in water. Explain why this is so. ………………………………………………………………………………….…………………. ………………………………………………………………………………………………..…[1] (c) Complete the following table to show how the following physical quantities would change, if at all, if the cube were taken to the Moon. The first one has been answered for you. [2] Physical quantity Increase No change Decrease Dimensions of cube 9 Mass of cube Weight of cube Density of cube Setters: TLH / MS / TBH PHYSICS /II

2010 End- of-Year Examination Secondary Three 3 Nanyang Girls’ High School 2 Fig. 2.1 shows the velocity-time graph of a car moving from 1 set of traffic lights to the other. 0 5 10 15 20 25 30 4 8 12 velocity m/s time s Fig. 2.1 (a) What is the distance between the 2 traffic lights? distance = ………………………. [2] (b) During which interval of time is the rate of change of speed greatest? ………………………………………………………………………………….…………[1] (c) Calculate the average speed over the whole journey. Setters: TLH / MS / TBH PHYSICS /II [Turn over

2010 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School average speed = …………………. [1] 3 Fig. 3.1 shows a 30 N weight being supported by two strings from a ceiling. The tension forces in the two strings are T1 and T2. ceiling 100° weight = 30 N T2 Fig. 3.1 T1 110° (a) On Fig. 3.1, label the directions of T1 and T2 in the strings acting on the weight. [1] (b) With the aid of a scale diagram, determine the magnitudes of T1 and T2. Setters: TLH / MS / TBH PHYSICS /II

2010 End- of-Year Examination Secondary Three 5 Nanyang Girls’ High School T1 = …………………, T2 = …………………. [3] 4 A boy who weighs 500 N stands on a uniform plank with supports at P and Q. The weight of the plank is 100 N and the separation between the boy and the supports are as shown in Fig. 4.1. Fig. 4.1 Determine the normal reactions, R P and RQ. normal reaction, R P = ………………… normal reaction, RQ = ………………… boy P Q 0.20 m 0.20 m 2.00 m 1.60 m 100 N 500 N RP RQ Setters: TLH / MS / TBH PHYSICS /II [Turn over

2010 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School [4] 5 Fig. 5.1 shows the top view of 2 mirrors, M1 and M2, placed at right angles to each other. A solid rectangular block with a spot, S, painted on one side is placed between these mirrors. E Mirror M2 S Mirror M1 Fig. 5.1 (a) Complete Fig. 5.1 to show the positions of the three images of the block that are formed in the two mirrors. [2] (b) On Fig. 5.1, draw a light ray to show how the observer, E, is able to see the reflection of the spot, S, after the light ray is reflected by both mirrors M 1 and M2. [2] Setters: TLH / MS / TBH PHYSICS /II

2010 End- of-Year Examination Secondary Three 7 Nanyang Girls’ High School 6 Fig. 6.1 shows the structure of a simple periscope used to see over the crowds at the Youth Olympic Games. incident rays eye 45° glass prisms Fig. 6.1 When the periscope is used, total internal reflection occurs in the glass prisms. (a) State the conditions required for total internal reflection to take place. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ……………………………………………….……………………………………………[2] (b) On Fig. 6.1, complete the paths of t he 2 incident rays through the periscope into the eye. [2] (c) Different types of glass have different re fractive indices. In choosing a suitable glass to use for the prisms in the periscope, a critical angle of less than 45° is required. Calculate the refractive index that will give a critical angle of 45°. refractive index = ……………………….[1] Setters: TLH / MS / TBH PHYSICS /II [Turn over

2010 End-of-Year Examination Secondary Three 8 Nanyang Girls’ High School 7 In Fig. 7.1, a convex lens, L, is used to view the image, I, of an arrow object, O. Fig. 7.1 L 2 cm 2 cm O I (a) Explain what is meant by the focal length of a convex lens. ………………………………………………………………………………………………… ……………………………………….…………………………………………………..…...[1] (b) Fig. 7.1 is drawn to scale such that 1 square = 2 cm. (i) By drawing a ray diagram, determine the position of the principal focus. Label the position F. [2] (ii) State the focal length of the convex lens. focal length = ………………….. [1] (c) State one application for such a lens being placed near to the object as shown above in Fig. 7.1. …………………………………………………………………………….…….……………[1] Setters: TLH / MS / TBH PHYSICS /II

2010 End- of-Year Examination Secondary Three 9 Nanyang Girls’ High School 8 Fig. 8.1 shows a series of floating balls which are used to limit the swimming area outside a beach. The balls are linked by identical light strings of length 1.0 m. A water-wave of small amplitude approaches from the left moving right as shown. 12 13 11 10 2 1 3 4 5 6 8 7 9 direction of wave Fig. 8.1 Fig. 8.1 (a) State the type of wave shown in Fig. 8.1. (a) State the type of wave shown in Fig. 8.1. …………………………………………………….………………………………………[1] …………………………………………………….………………………………………[1] (b) State the direction of mo tion of ball 5 at the instant shown in Fig. 8.1. (b) State the direction of mo tion of ball 5 at the instant shown in Fig. 8.1. ……………………………………………………………….……………………………[1] ……………………………………………………………….……………………………[1] (c) When the wave reaches ball 10, state the initial direction in which this ball starts to move. (c) When the wave reaches ball 10, state the initial direction in which this ball starts to move. ………………………………………………….…………………………………………[1] ………………………………………………….…………………………………………[1] (d) It is observed that ball 5 makes one complete oscillation in 5.0 s. Calculate the frequency of the wave. (d) It is observed t