2024 ASRJC JC2 H1 Physics Prelim P2

1 8867/02/ASRJC/2024PRELIM [Turn Over Name: _____________________________ ( ) Class: 24 / ______ 2024 JC2 Preliminary Examination PHYSICS Higher 1 8867/02 Paper 2 Structured Questions Thursday 12 September 2024 2 hours Candidates answer on the Question Paper. No Additional Materials are required. 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. The use of an approved scientific calculator is expected, where appropriate. Section A Answer all questions. Section B Answer any one question. 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. This document consists of 26 printed pages and 2 blank pages. For Examiner’s Use Paper 1 (30 marks) Paper 2 (80 marks) 1 2 3 4 5 6 7 8 Deductions Total ANDERSON SERANGOON JUNIOR COLLEGE

2 8867/02/ASRJC/2024PRELIM Data speed of light in free space, c = 3.00  108 m s−1 elementary charge, e = 1.60  10−19 C unified atomic mass constant, u = 1.66  10−27 kg rest mass of electron, me = 9.11  10−31 kg rest mass of proton, mp = 1.67  10−27 kg the Avogadro constant NA = 6.02  1023 mol−1 gravitational constant G = 6.67  10−11 N m2 kg−2 acceleration of free fall, g = 9.81 m s−2 Formulae uniformly accelerated motion, s = ut + 1 2 at2 v2 = u2 + 2as resistors in series, R = R1 + R2 + … resistors in parallel, 1/R = 1/R1 + 1/R2 + …

3 8867/02/ASRJC/2024PRELIM [Turn Over Section A Answer all the questions in this section. 1 (a) Length, mass and amount of substance are all SI base quantities. (i) State two other SI base quantities. 1. …………………………………………………………………………………………... 2. …………………………………………………………………………………………... [2] (ii) State one derived quantity. …………………………………………………………………………………… … …… [1] (b) The acceleration of free fall g may be determined from an oscillating pendulum using the equation 2 2 4g T  l where l is the length of the pendulum and T is the period of oscillation. In an experiment, the measured values for an oscillating pendulum are l = 1.50 m ± 2% and T = 2.48 s ± 3%. (i) Determine the percentage uncertainty in g. percentage uncertainty = ……………………………. [1] (ii) Calculate g together with its uncertainty. g = ………………………….. ± ………………… m s–2 [3] [Total 7]

4 8867/02/ASRJC/2024PRELIM 2 A sky -diver jumps from a high -altitude balloon. The variation with time t of the vertical acceleration a of the sky-diver is shown in Fig. 2.1. Fig. 2.1 (a) Explain why the acceleration of the sky-diver decreases with time. ……………………………………………………………………………………………………... ……………………………………………………………………………………………………... ………………………………………………………………………………………………….. [2] (b) State and explain whether the acceleration at the start of the jump is greater than, equals to, or less than 9.81 m s–2. ……………………………………………………………………………………………………... ……………………………………………………………………………………………………... ………………………………………………………………………………………………….. [2] (c) With reference to Fig. 2.1, describe the motion of the sky-diver. ……………………………………………………………………………………………………... ……………………………………………………………………………………………………... ………………………………………………………………………………………………….. [ 2] (d) Explain how the maximum velocity of the sky-diver can be determined from Fig. 2.1. ……………………………………………………………………………………………………... ……………………………………………………………………………………………………... …………………………………………………………………………………………………. [2] a / m s–2 t / s 0 4.0 8.0 12.0 16.0 20.0 24.0 28.0

5 8867/02/ASRJC/2024PRELIM [Turn Over (e) Sketch the displacement-time graph of the sky-diver on Fig. 2.2. Fig. 2.2 [2] [Total : 10] displacement t / s 0 4.0 8.0 12.0 16.0 20.0 24.0 28.0

6 8867/02/ASRJC/2024PRELIM 3 A uniform beam AB is attached by a hinge to a wall at end A, as shown in Fig. 3.1. Fig. 3.1 (not to scale) The beam has length 0.50 m and weight W. A block of weight 12 N rests on the beam at a distance of 0.15 m from end B. The beam is held horizontal and in equilibrium by a string attached between end B and a fixed point C. The string has a tension of 17 N and is at an angle of 50° to the horizontal. (a) State two conditions for an object to be in equilibrium. 1 ………………………………………………………………………………………….……… .. ………………………………………………………………………………………….………… .. 2 ……………………………………………………………………………………….………… .. ……………… …………………………………………………………………………….. ............ [2] (b) Show that the weight W of the beam is 9.2 N. [2] (c) A force F acts on the beam at A. Calculate the magnitude of F. F = ……………………………. N [3]

7 8867/02/ASRJC/2024PRELIM [Turn Over (d) The block is now moved closer to end A of the beam. Assume that the beam remains horizontal. State and explain whether this change will increase, decrease or have no effect on the horizontal component of the force exerted on the beam by the hinge. …………………………………………………………………………………………….……… .. ………………………………………………………………………………………….………… .. ……………… ……………………………………………………………………………… ....... [2] [Total: 9]

8 8867/02/ASRJC/2024PRELIM 4 This question is about the conduction properties of semiconductor and metal. The variation with temperature θ of the resistance R of a sample of semiconducting material is shown in Fig. 4.1. Fig. 4.1 (a) A student proposes that R may be inversely proportional to θ over the range of temperature from 50 °C to 150 °C. Show, without drawing a graph, that this proposal is not correct. [2]

9 8867/02/ASRJC/2024PRELIM [Turn Over (b) A second student proposes that R decreases exponentially with temperature T for temperatures above about 100 °C, where temperature T is expressed in the unit kelvin (K). The relationship between T and θ is T = θ + 273.15 Fig 4.2 shows some of the data for R, θ, T −1, and ln(R / Ω). Fig. 4.2 (i) Complete Fig. 4.2 for the temperature of 160 °C. [1]

10 8867/02/ASRJC/2024PRELIM (ii) Fig. 4.3 is a graph of some of the data of Fig. 4.2. Fig. 4.3 Plot the point for the temperature of 160 °C on Fig. 4.3. [1]