Prelim H2P4

1 Name: _____________________________ ( ) Class: 21 / ______ 2021 JC2 Preliminary Exam PHYSICS Higher 2 9749/04 Paper 4 Practical 30 Aug 2021 2 hours 30 minutes Candidates answer on the Question Paper. Additional Materials: As listed in the Confidential Instructions READ THESE INSTRUCTIONS FIRST Write your name, class index number and class in the spaces provided above. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. Answer all questions. Write your answers in the spaces provided on the question paper. 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. Give details of the practical shift and laboratory, where appropriate, in the boxes provided. 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. Shift Laboratory 9749/04/ASRJC/2021Prelim [Turn Over ANDERSON SERANGOON JUNIOR COLLEGE This document consists of 18 printed pages and 2 blank pages. For Examiner’s Use Paper 4 (55 marks) 1 2 3 4 Total (55 marks)

2 Question 1 begins on the next page. 9749/04/ASRJC/2021Prelim For Examiner’s Use

3 1 In this experiment, you will investigate how the resistance R of a thermistor varies with its temperature θ. (a) Construct the circuit shown in Fig. 1.1. Fig. 1.1 (b) Immerse the thermistor in a beaker of water. Measure and record the current I, potential difference V and temperature θ. I = .............................. V = .............................. θ = ……....................[1] (c) (i) Arrange the apparatus so that the water may be heated. Use the stand and clamp to ensure that the wires connected to the thermistor are kept well away from the source of heating. (ii) Use the heating apparatus to raise the temperature of the water by about 10 0C. After the temperature has stabilized, measure and record the new values of I, V and θ. I = .............................. V = .............................. θ = ……....................... 9749/04/ASRJC/2021Prelim [Turn Over M1 For Examiner’s Use V mA

4 (iii) Repeat (c)(ii) for θ varying from room temperature to 80 °C. Tabulate these results. Include the results from (b), (c)(ii), all the values of R, where R = V / I, and all the values of thermodynamic temperature T, where T = θ + 273. [6] (d) The formula which relates R and T is where A is a constant, E is an energy characteristic of the thermistor, and k = 1.38 × 10 23‒ J K 1‒ . Plot a suitable graph to de