NYGH 2019-S3EOY-Physics P2

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2019 Secondary Three PHYSICS 1 hour 45 minutes Paper 2 Theory Paper 10:00 – 11:45 Tuesday 15 October 2019 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 11 has a choice of parts to answer: 11 Either or 11 Or. Write your answers in the spaces provided on the question paper. At the end of the examination, circle 11 Either or 11 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 8 Section B (30 marks) 9 10 11 Either 11 Or Paper 2 (70 marks) Paper 1 (30 marks) Overall % This document consists of 17 printed pages and 1 blank page. Setters: HWQ & SL NANYANG GIRLS’ HIGH SCHOOL

2019 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Setters: HWQ & SL Physics II Section A (40 marks) Answer all questions. 1 A student wants to measure the cross- sectional area of a cylindrical steel rod as shown in Fig. 1.1. Fig. 1.1 She uses a vernier caliper and obtains the following readings as shown in Fig. 1.2 and Fig. 1.3. Fig. 1.2 shows the reading when the jaws of the vernier caliper are closed and Fig. 1.3 shows the reading when the jaws of the vernier caliper are around the steel rod. Fig. 1.2 Fig. 1.3 (a) (i) State the zero error of the vernier caliper. zero error = ……………………..[ 1] (ii) Determine the cross-sectional area of the steel rod. cross-sectional area = ……………………..[2] (b) State two ways in which she can improve the accuracy of her results. ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………[2] 5 cm 0 10 4 5 5 cm 0 10 0 1 cross-sectional area

2019 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School Setters: HWQ & SL Physics II [Turn over 2 A student stands on the top of a house and throws a ball straight down with an initial velocity of 2.0 m s −1. The ball is thrown from a height of 4.5 m . Assume that air resistance is negligible. Fig. 2.1 (a) Calculate the velocity of the ball when it reaches the ground. velocity of the ball = ……………………..[2] (b) Calculate the time taken for the ball to reach the ground. time taken to reach the ground = ……………………..[2] (c) State and explain the change (if any) to (b) if a heavier ball had been used. ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………[2] 4.5 m 2.0 m s−1

2019 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School Setters: HWQ & SL Physics II 3 A climber is supported by a rope on a vertical wall as shown in Fig. 3.1. Fig. 3.1 The weight of the climber is 600 N. A light rope is attached to the climber and to a fixed point P. The normal contact exerted on the climber from the wall is 280 N. The climber is in equilibrium. (a) State the conditions necessary for the climber to be in equilibrium. ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………[2] (b) Draw a scaled vector diagram to determine the tension of the rope. magnitude of tension = …………………….. [4] direction of tension = ……………………..[4] P wall climber

2019 End-of-Year Examination Secondary Three 5 Nanyang Girls’ High School Setters: HWQ & SL Physics II [Turn over 4 Fig. 4.1 shows a lamp with its centre of gravity marked with a cross (X) and labelled. A man accidentally bumps into the lamp, causing it to tip as shown in Fig. 4.2. Fig. 4.1 Fig. 4.2 (a) Describe and explain what happens to the lamp in Fig. 4.2. ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………[2] (b) Suggest two ways to make the lamp more stable. ……………………………………………………………………………………………… ……………………………………………………………………………………………[2] C.G.

2019 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School Setters: HWQ & SL Physics II 5 Fig. 5.1 shows a non- uniform beam of weight 2 0 N resting on a frictionless wall at D and on the floor at E. The centre of gravity of the beam is at C. Fig. 5.1 (a) Calculate the normal contact force exerted by the wall on the beam at D. normal contact force at D = ……………………..[ 2] (b) State the normal contact force exerted by the floor on the beam at E. normal contact force at E = ……………………..[1] (c) If the wall has friction, state and explain if the magnitude of the normal contact force at E would be higher, lower or the same as (b). ……………………………………………………………………………………………… ……………………………………………………………………………………………… ……………………………………………………………………………………………[2] 0.10 m 0.20 m D E C 0.40 m 0.35 m 0.20 m 0.17 m

2019 End-of-Year Examination Secondary Three 7 Nanyang Girls’ High School Setters: HWQ & SL Physics II [Turn over 6 Fig. 6.1 shows a manometer. The atmospheric pressure is 75 cm Hg; the gas within the gas vessel has a volume of 0.012 m 3. The densities of mercury and water are 13 600 kg m-3 and 1000 kg m-3 respectively. Fig. 6.1 (a) Label in Fig. 6.1 a point ‘S’ that is the location with the highest pressure. [1] (b) Determine the gas pressure exerted by the gas in the vessel. gas pressure = ……………………………. [2 ] (c) The gas is allowed to expand to a new volume of 0.013 m 3. Determine the new gas pressure exerted by the gas. State any assumptions you made. assumption : ………………………………………………………………… new gas pressure = ……………………………. [2 ] gas in vessel ruler 610 N force manometer water

2019 End-of-Year Examination Secondary Three 8 Nanyang Girls’ High School Setters: HWQ & SL Physics II 7 Fig. 7.1 shows a device that is used to compress objects placed above the large piston. Fig. 7.1 (a) Explain how a small force on the left handle can produce a large force on the object. ……………………………………………………………………………………………... ……………………………………………………………………………………………… ……………………………………………………………………………………………... ……………………………………………………………………………………………… …………………………………………………………………………