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 determine values for E and A. E = …………..……….. A = ……..……………. [7] 9749/04/ASRJC/2021Prelim For Examiner’s Use A2 A4 A5 A3

5 9749/04/ASRJC/2021Prelim [Turn Over For Examiner’s Use P4 P5 P6

6 (e) Comment on any anomalous data or results you may have obtained. Explain your answer. ……..…………………………………………………………………………………….………… ……………..…………………………………………………………………………….………… ……………………...………………………………………..…………………………….……[1] [Total: 15 marks] 9749/04/ASRJC/2021Prelim P4 P5 P6 For Examiner’s Use M3

7 Question 2 begins on the next page. 9749/04/ASRJC/2021Prelim [Turn Over For Examiner’s Use

8 2 In this experiment, you will investigate the oscillations of a pendulum. (a) Set up the apparatus as shown in Fig. 2.1. The length l of the pendulum is approximately 70 cm. As the pendulum oscillates, a stop shortens the effective length l by an amount d. Mount the wooden rod horizontally so that it acts as a stop half-way down the pendulum. The stop should just touch the string when the pendulum rests in a vertical plane. (b) (i) Measure and record the value of l. l = ..………….………..……….. (ii) Measure and record the value of d. d = …………….………..…… [1] (iii) Gently displace the pendulum so that it performs small oscillations in a vertical plane perpendicular to the stop. Make and record measurements to determine the period T of these oscillations. 9749/04/ASRJC/2021Prelim d wooden blocks l stop M1 M2 A1 For Examiner’s Use Fig. 2.1

9 T = …………….………..…… [2] (c) The quantities d and T are related by the equation where k and l are constants, and g = 9.81 m s 2. (i) Calculate k. k = …………….……….. m s 2 [2] (ii) It is not accurate to draw a conclusion for the value of k based on only one reading as in c(i). It is a good practice to determine k graphically. Using the same apparatus, describe how you would obtain further measurements, and the graph that you would plot to determine k. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ……………………………………………………………………………………………[2] [Total: 7 marks] 9749/04/ASRJC/2021Prelim [Turn Over A2 A3 A4 A5 For Examiner’s Use

10 3 In this experiment, you will model the stability of a scoop of ice cream in a cone. (a) (i) Measure and record the diameter x and the height h of the cone, as shown in Fig. 3.1. Fig. 3.1 x = …..…………….…………. h = …..…………….……[1] (ii) Estimate the percentage uncertainty in your value of x. percentage uncertainty = …..…………….………….% [1] 9749/04/ASRJC/2021Prelim For Examiner’s Use M1 A1