2023 NYGH Phy Prelims P2

南洋女子中学校 NANYANG GIRLS' HIGH SCHOOL Preliminary Examination 2023 Secondary Four 'O' Level CANDIDATE NAME CENTRE NUMBER S INDEX NUMBER PHYSICS 6091/02 Paper 2 28 Aug 2023, Monday 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number, index number and name on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Sections A and B Answer all questions. Question 13 has a choice of parts to answer. Write your answers in the spaces provided on the Question Paper. Electronic calculators may be used. You are advised to spend no longer than one hour on Section A and no longer than 45 minutes on Section B. At the end of examination fasten all your work securely together. The number of marks is given in the brackets [ ] at the end of each question or part question. Examiner’s Use Paper 1 Section A 1 2 3 4 5 6 7 8 9 10 11 12 Section B 13 14 15E 15O Total 120 % This document consists of 26 printed pages and 2 blank pages. [Turn over

2023 Preliminary Examination Secondary 4 2 Nanyang Girls’ High School Physics II Section A (50 marks) Write your answers in the spaces provided. 1 A list of 8 physical quantities is shown below: length time energy force speed weight mass acceleration From the above list, (a) state all the derived quantities, ……………………………………………………………………………………………….…….. ………………………………………………………………………………………………..… [1] (b) state all the vector quantities, ……………………………………………………………………………………………….…….. ………………………………………………………………………………………………..… [1] (c) state a pair of physical quantities that have the same S.I unit (s), and write down the symbol of this unit(s). a pair of physical quantities: ……………………………………………………………… symbol of unit(s): ……………………………………………………………… [1]

2023 Preliminary Examination Secondary 4 3 Nanyang Girls’ High School Physics II [Turn over 2 Fig. 2.1 shows the speed-time graph for a car travelling along a straight horizontal road. Fig. 1.1 Fig. 2.1 (a) On Fig. 2.1, state the duration at which the car has a non-uniform deceleration. From t = to t = [1] (b) Calculate the deceleration of the car at t = 3.0 s. deceleration = ………...................................... [2] (c) Calculate the distance travelled by the car from t = 2.0 s to 4.0 s. distance = ………...................................... [2]

2023 Preliminary Examination Secondary 4 4 Nanyang Girls’ High School Physics II (d) Between t = 0 and t = 2.0 s, Newton’s first law of motion describes the motion of the car. Explain using ideas about forces, what happens during this part of the journey. ……………………………………………………………………………………………….…….. ……………………………………………………………………………………………….…….. ……………………………………………………………………………………………….…….. ……………………………………………………………………………………………….…….. …………………………………………………………………………………………….….… [2] 3 Fig. 3.1 shows a crane lifting some bricks at a construction site. Fig. 3.1 The weight of a container of bricks is 12000 N. This load produces a turning moment on the arm of the crane about the point P. (a) Calculate this turning moment about P. turning moment = ………...................................... [1] (b) Explain why the counterweight is necessary. ……………………………………………………………………………………………….…….. ……………………………………………………………………………………………….…….. ………………………………………………………………………………………………..… [1]

2023 Preliminary Examination Secondary 4 5 Nanyang Girls’ High School Physics II [Turn over (c) Suggest one advantage of being able to move the counterweight along the arm. ……………………………………………………………………………………………….…….. ……………………………………………………………………………………………….…….. ………………………………………………………………………………………………..… [1] (d) The motor of the crane lifts the 12 000 N through a height of 15 m in 1.5 min. Determine the power delivered by the motor, assuming that it is 100% efficient. power delivered = ………...................................... [2]

2023 Preliminary Examination Secondary 4 6 Nanyang Girls’ High School Physics II 4 Fig. 4.1 shows the cross section of a cup noodle container. Fig. 4.1 (a) The container of the cup noodles is made of expanded polystyrene. State and explain one advantage of using such a material to make the container. ……………………………………………………………………………………………….…….. ……………………………………………………………………………………………….…….. ……………………………………………………………………………………………….…….. ………………………………………………………………………………………………..… [2] (b) Explain why the inner surface of the lid is usually shiny. ……………………………………………………………………………………………….…….. ……………………………………………………………………………………………….…….. ……………………………………………………………………………………………….…….. ………………………………………………………………………………………………..… [2] lid container

2023 Preliminary Examination Secondary 4 7 Nanyang Girls’ High School Physics II [Turn over (c) The container contains 100 g of noodles at 26 C. 400 g of water at 90 C is then poured into the container. Given: specific heat capacity of water = 4200 J / (kgC) specific heat capacity of the noodles = 2400 J / (kgC) Assuming no heat is lost to the surroundings and the container, calculate the final temperature of the mixture. final temperature = ………...................................... [3]

2023 Preliminary Examination Secondary 4 8 Nanyang Girls’ High School Physics II 5 Fig. 5.1 and Fig. 5.2 show a semi-circular glass block as rays of light are directed into the block at different angles. The rays are directed towards the centre C of the semi-circle so that no refraction occurs as the rays enter the block. Fig. 5.1 Fig. 5.2 (a) Explain why the incident light ray does not change direction as it enters the glass block. ……………………………………………………………………………………………….…….. ……………………………………………………………………………………………….…….. ………………………………………………………………………………………………..… [1] (b) Calculate the refractive index of the glass. refractive index = ………...................................... [2]

2023 Preliminary Examination Secondary 4 9 Nanyang Girls’ High School Physics II [Turn over 6 Fig. 6.1 shows an object O placed in front of a converging lens L with two focal points labelled F. Fig. 6.1 (a) On Fig. 6.1, draw two rays from the top of the object O to locate the position of the image. Draw and label the image with the letter I. [2] (b) Complete the path for light ray P after it passes the lens. [1] (c) Describe two changes in the image I obtained in (a) if the object O is now shifted closer to the lens L. ……………………………………………………………………………………………….… [1] O ob F F P L

2023 Preliminary Examination Secondary 4 10 Nanyang Girls’ High School Physics II 7 Fig. 7.1 shows a straight dipper vibrating near the water surface of a ripple tank. Water waves forming crests and troughs, are observed as a series of wavefronts moving away from the dipper. Fig. 7.1 (a) (i) Explain what is meant by a wavefront. …………………………………………………………………………………………………. ………………………………………………………………………………………….….. [1] (ii) Using two dashed lines, draw two consecutive wavefronts on Fig. 7.1. [1] (b) Two students conduct an experiment using the ripple tank in Fig. 7.1 to measure the sp