BV 4NA Physics 2022 Paper 2 (Syllabus 5105)

BEDOK VIEW SECONDARY SCHOOL PRELIMINARY EXAMINATION 2022 CANDIDATE NAME REGISTER NUMBER CLASS SCIENCE (PHYSICS) 5105/02 Secondary 4 Normal Academic 28 July 2022 Paper 2 Theory Paper 1 and 2: 1 hour 15 minutes Additional Materials: - READ THESE INSTRUCTIONS FIRST Write your index number and name on all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. Section A Answer all questions in the spaces provided. Section B Answer any two questions. Write your answers in the spaces provided. Candidates are reminded that all quantitative answers should include appropriate units. The use of an approved scientific calculator is expected, where appropriate. Candidates are advised to show all their working in a clear and orderly manner, as more marks are awarded for sound use of concepts than for correct answers. 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 Paper 1 / 20 Section A 1 / 2 2 / 7 3 / 5 Section B 4 / 8 5 / 8 6 / 8 Total / 50 % / Grade / Setter(s): Abdul Malek Osman Parent’s / Guardian’s Signature: ………………….…………... This document consists of 11 printed pages. Do not turn over the page until you are told to do so.

2 BVSS Section A Answer all questions in the spaces provided. 1 A student has a metal object. For examiner’s use (a) The student measures the mass of the object. State the name of the equipment used to measure the mass. ....................................................................................................................... [1] (b) The mass of the metal object is 1260 g. The volume of the metal is 150 cm3. Calculate the density of the metal. density = ………………………… g/cm3 [1] [Total: 2] 2 A scientist performs an experiment to investigate the motion of a loaded metre rule as shown in Fig. 2.1. Fig. 2.1

3 BVSS [Turn over A 100 g load is attached to the metre rule such that the centre of the load is a distance d away from the pivot. The rule is displaced a small distance to one side then allowed to swing and the time t taken for 10 complete swings is recorded. The results for the experiment are recorded in Table 2.1. Table 2.1 d / cm 70.0 75.0 80.0 85.0 90.0 t / s 16.80 17.10 17.60 17.90 18.40 T / s …………… 1.71 …………… 1.79 1.84 For examiner’s use (a) Calculate the period T for d = 70.0 cm and d = 80.0 cm in Table 2.1. [1] (b) On the graph below, plot the graph of T / s against d / cm and draw the best- fit line. [3] T / s 1.90 1.80 1.85 1.75 1.70 1.65 d / cm 70.0 85.0 80.0 75.0 90.0

4 BVSS (c) From your graph, determine the distance d when the period T is 1.75 s. Give your answer to one decimal place. d = …………………..……. cm [1] For examiner’s use (d) In a second experiment, the scientist uses the same metre rule but replaces the load with a lighter load of 50 g. State and explain the effect on the period of the swinging rule with a lighter load. ……………………………………………………………………………………… ……………………………………………………………………………………… [2] [Total: 7] 3 Fig. 3.1 shows a pin and Fig. 3.2 shows a person pushing the pin into a wall with a force of 60 N. Fig. 3.1 Fig.3.2 (a) The area of the top surface of the pin is 1.5 cm2. Calculate the pressure exerted on the top surface of the pin. pressure = ………………………… N/cm2 [2] (b) The area of the top surface of the pin is 500 times larger than the area of the point. Calculate the value of the pressure exerted by the point on the wall. pressure = ………………………… N/cm2 [1] 60 N point

5 BVSS [Turn over (c) Describe the effect on the force applied to top surface of the pin when the pin is used on a soft wall. Explain why. ………………………………………………………………………………….….. ………………………………………………………………………………….….. ………………………………………………………………………………….….. ………………………………………………………………………………….….. [2] For examiner’s use [Total: 5]

6 BVSS Section B Answer any two questions from this section in the spaces provided. 4 Fig. 4.1 shows the motion of a bus along a straight road. Fig. 4.1 For examiner’s use (a) Describe the motion of the bus between points B and C. ………………………………………………………………………………….….. ………………………………………………………………………………….….. [1] (b) Calculate the distance travelled by the bus between points C and E. distance = ………………………… m [2] (c) Given that t he engine force is 20 000 N when the car travels at constant speed, calculate the work done by the engine of the car between points C and D. work done = ………………………… Nm [1] F E speed/ m/s time/ s 24 20 16 12 8 4 0 2 4 6 8 10 12 14 16 18 20 A B C D 0 22 28 32 34 24 26 30 speed / ms-1

7 BVSS [Turn over (d) Calculate the acceleration of the car between points D and E. acceleration = ………………………… m/s2 [1] For examiner’s use (e) The Electronic Road Pricing (ERP) system is the primary method of regulating traffic in Singapore. ERP gantries erected at key positions charge motorists for utilising certain roads at times when these roads are more prone to congestion. The ERP system leverages on technology to allow for a more effective and flexible method of congestion charging. An automated collection of a congestion fee from any vehicle passing under a ERP gantry during its operating hours was implemented. The gantry points use the ERP units that are placed at the windscreen of vehicles to charge vehicle on their toll. Fig. 4.2 shows an ERP unit that is commonly seen at the windscreen of the vehicle. Fig. 4.2 The gantry points send an electromagnetic signal that activates the tag on the ERP unit and reflects the wave back to the gantry points with its tag identification. (i) State the type of electromagnetic wave that is used in the ERP system. ……………………………………………………………………………….. [1] (ii) The electromagnetic wave in the ERP system has a frequency of 900 MHz. The speed of the electromagnetic wave in air is 3 x 108 m/s. Calculate the wavelength of this electromagnetic wave. wavelength = ………………………… m/s [2] [Total: 8]

8 BVSS 5 (a) Fig. 5.1 shows part of the electrical wiring in a toaster. Fig. 5.1 For examiner’s use (i) Complete Fig. 5.1 to show how the earth wire, switch and fuse should be connected in the wiring of the electric toaster. [2] (ii) Explain why the heating element is placed near the base of the electric toaster. ……………………………………………………………………………… ……………………………………………………………………………… ……………………………………………………………………………… [1] (iii) The toaster has a dull black metal casing. Describe how we can improve on the design of the toaster to minimise heat loss to the surroundings. Explain why. ……………………………………………………………………………… ……………………………………………………………………………… ……………………………………………………………………………… ……………………………………………………………………………… [2] earth live neutral dull black metal casing heating element

9 BVSS [Turn over (b) The cooling c