2022 YTSS Phy Prelims P3

NAME: ( ) CLASS: YISHUN TOWN SECONDARY SCHOOL PRELIMINARY EXAMINATION 2022 SEC 4 EXPRESS PHYSICS (6091/3) DATE : 25 Aug 2022 DAY : Thursday DURATION: 1 hr 50 min MARKS: 40 marks READ THESE INSTRUCTIONS FIRST Write your name, class and register number in the spaces provided at the top of this page. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use glue or correction fluid. You are to submit the separate sheet of paper provided together with your answers. Answer all the questions in the spaces provided. INFORMATION FOR CANDIDATES The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. The number of marks is given in brackets [ ] at the end of each question or part question. This question paper consists of 13 printed pages. Question 1 Question 2 Question 3 TOTAL

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3 Section A 1 In this experiment, you will determine the specific heat capacity of cooking oil. You have been provided with  an arrangement of resistors to act as a heater (from 2021 O level)  an ammeter (0 – 1A range)  a voltmeter (0 – 5V range)  a 4.5V power supply  a switch  6 x leads and crocodile clips  a beaker containing 40 cm3 cooking oil  a thermometer  a retort stand, boss and clamp  a stopwatch The heater is made from five resistors connected in parallel. Do not separate the resistors. Fig 1.1 Assemble the circuit shown in Fig 1.1. Close the switch. Take the readings in (a) and then immediately open the switch. (a) (i) Record the current I. I = [1] (ii) Record the potential difference V across the heater. V = [1]

4 (iii) Calculate the power P of the heater using the equation shown. P = VI P = [1] (b) Disconnect the voltmeter from the circuit and arrange the apparatus shown in Fig 1.2 with the heater placed in the cooking oil. The thermometer should be placed close to, but not in contact with the heater. Fig 1.2 (c) Calculate the mass m of the cooking oil using the equation m = ρ v where the density of the oil ρ is 0.90 g/cm3 and the volume of oil v is 40 cm3. m = [1] (d) Close the switch and start the stopwatch. Stop the stopwatch when the temperature of the oil has increased by = 2.0 oC. Open the switch. Record the time taken t in seconds. t = [1]

5 (e) A suggested relationship between them is where P is the power of the heater from (a) and c is the specific heat capacity of the oil in the beaker. Using the same apparatus in Fig 1.2, plan an experiment to investigate this relationship. Your plan should include  the quantities that you should keep constant,  a detailed description of how you will perform the experiment,  a suitable table in which to display your measurements and calculated v