PHS 2022 Prelims 4N ScPhy P2 QP

Name: ...................................... Register/Index Number: ............... Class: .............. PRESBYTERIAN HIGH SCHOOL SCIENCE (PHYSICS) 5105/02 PAPER 2 26 July 2022 Monday 1 hour 15 minutes Papers 1 and 2 PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL PRESBYTERIAN HIGH SCHOOL 2022 SECONDARY FOUR NORMAL (ACADEMIC) PRELIMINARY EXAMINATION INSTRUCTIONS TO CANDIDATES Write your class, register number and name on all the work you hand in. Write in dark blue or black pen. Do not use correction fluid. Section A Answer all questions. Write your answers in the spaces provided on the question paper. Section B Answer any two questions. Write your answers in the spaces provided on the question paper. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Section A 14 Section B 16 Total 30

2 [Turn over Setter: Mr Edmund Choo Vetted by: Mr Sherman See This question paper consists of 12 printed pages. Section A Answer all the questions in the spaces provided. 1 Fig. 1.1 shows a child on a swing. The child starts from X, swings to Y, to Z and then back to Y and to X again. Fig. 1.1 (a) At which point of the swing is the speed maximum? speed = ……………….. m / s [1] Fig. 1.2 shows how the speed of a child, playing on a swing, changes with time. X Z Y 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0.1 0.2 0.3 0.4 0.5 0.6 speed m/s time / s

3 [Turn over Fig. 1.2 (b) What is the maximum speed of the child? speed = ……………….. m / s [1] (c) Describe the motion of the child from (i) t = 0.0 s to t = 0.1 s ………………………………………………………………………………………………………………………………………………………………………. [1] (ii) and from t = 0.2 s to t = 0.3 s. ………………………………………………………………………………………………………………………………………………………………………. [1] 2 A cup made from plastic, containing a hot drink, is shown in Fig. 2.1. Fig. 2.1 (a) State two ways how energy is transferred from the hot drink to the surrounding. ………………………………………………………………………………………..…………………………………………………………………………………………..…

4 [Turn over …………………………………………………………………………………………..……………………………………………………………………………………….. [2] (b) Explain how the plastic material used for the cup helps to reduce the energy transfer to the surrounding. ………………………………………………………………………………………….……………………………………………………………………………………….. [1]

5 [Turn over (c) Suggest one modification to the cup so that the drink may remain hot for a longer time. ………………………………………………………………………………………….……………………………………………………………………………………….. [1] 3 Fig. 3.1 shows a submarine sending a signal directed to a ship to determine its position. Fig. 2.1 (a) Describe how the sound wave is transmitted in water. …………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………. [2] (b) The signal takes 1.2 s to be received by the submarine after being sent. Given that the speed of sound in water is 1500 m / s, calculate the distance of the ship from the submarine. distance = ……………….. m [2]

6 [Turn over 4 Fig 4.1 shows a charger for a mobile (cell) phone. Fig 4.1 A child notes that there are only two pins in the charger. (a) State the wires that the two pins connect to. pin 1: …………………………………………. pin 2: …………………………………………. [1] (b) Draw the symbol for double insulation in the space below. [1]

7 [Turn over Section B Answer any two questions in the spaces provided. 5 Fig. 5.1 shows a speed-time graph for a vehicle starting to move. Fig. 5.1 (a) Calculate the acceleration of the vehicle in section A of the graph. acceleration = ……………….. m / s2 [2] (b) Calculate the distance travelled by the vehicle in the first 5 minutes of motion. distance = ……………….. m [2]

8 [Turn over The total frictional force acting on the vehicle for the up to t = 5 minutes is 10 000 N. The vehicle weighs 6 000 kg (the gravitational field strength is 10 N / kg). (c) Calculate the weight of the vehicle? weight = ……………….. kg [1] (d) State the driving force of the vehicle during section B of the motion. Explain how you arrived at your answer. …………………………………………………………………………………….……..……………………………………………………………………………….…………..…………………………………………………………………………….……………..…………………………………………………………………….…………………. [2] (e) State how the frictional force acting at section D compares with the frictional force at section B of the motion. …………………………………………………………………………….……………..…………………………………………………………………….…………………. [1]

9 [Turn over 6 A student measured the temperature of a liquid as it cooled and solidified at regular intervals. Fig. 5.1 shows the apparatus used by the student. (a) The results obtained at each time interval are as shown in Tab. 6.2 below. Time/ minutes 0 2 4 6 8 10 12 14 16 Temperature/ oC 90 70 65 63 63 63 63 58 54 (i) Plot a graph of the results, marking each point with a cross (X). [1] (ii) Draw a best-fit line, taking into account all the plotted points. [1] (iii) Use your graph to determine the temperature of the substance at the start of the experiment. temperature = ……………….. oC [1] (iv) Determine the melting point of the substance. melting point = ……………….. oC [1] (b) Using the kinetic model of matter, (i) explain why liquids have fixed volume but not have fixed shapes. …………………………………………………………………………………….…………………………………………………………………………………….…………………………………………………………………………………….…………………………………………………………………………………..[2] (ii) explain why solids have fixed volume and shapes. …………………………………………………………………………………….…………………………………………………………………………………….……………………………………………………………………………………. thermometer test tube liquid Fig. 6.1 Tab. 6.2

10 [Turn over …………………………………………………………………………………..[2] temperature/ oC time / minutes 0 2 4 6 8 10 12 14 16 18 10 20 30 40 50 60 70 80 90