2021 H2 Phy Prelim Paper 4 Question Paper (forJCs)

YISHUN INNOVA JUNIOR COLLEGE JC 2 PRELIMINARY EXAMINATION Higher 2 CANDIDATE NAME CG INDEX NO PHYSICS Paper 4 Practical Candidates answer on the Question Paper. No Additional Materials are required. 9749/04 26 Aug 2021 2 hours 30 minutes READ THESE INSTRUCTIONS FIRST This document consists of 7 printed pages and 1 blank page. This - Blank Page - This document consists of 17 printed pages and 3 blank pages. ©YIJC [Turn over Write your name and class in the spaces at the top of this page. 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, highlighters, glue or correction fluid/tape. 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, where appropriate, in the boxes provided. 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 For Examiner’s Use 1 /16 2 / 6 3 /21 4 /12 Total /55

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1 In this experiment, you will investigate an electrical circuit. You are provided with several groups of resistors connected in parallel. (a) Assemble the circuit as shown in Fig. 1.1 A, B, C, D and E are crocodile clips. Measure and record the length Lo of the resistance wire between the ends of A and B, as shown in Fig. 1.1. Lo = …………………………… [1] (b) (i) Select from the groups of resistors connected in parallel, N=4 and connect it across D and E as shown in Fig.1.1. (ii) Close the switch. Move C along the wire until the voltmeter reading is zero. Measure and record the distance L between A and C when the voltmeter reading is zero, as shown in Fig. 1.1. L = …………………………… [1] Open the switch. ©YIJC [Turn over 3

(c) Select a different group of resistors and repeat (b)(ii) until you have at least six sets of values of N and L. Record your results in a table. Include values of and in your table of results. [6] (d) (i) It is suggested that the quantities L and N are related by the equation where a and b are constants. Plot a suitable graph to determine a and b. Give appropriate units. a = .……………………... b = ………………………. [7] ©YIJC [Turn over 4

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(e) Without taking further readings, sketch a line on your graph grid to show the results you would expect if the experiment was repeated with the wire across AB replaced by one with the same length but with a larger resistance per unit length. Label this line W. [1] [Total : 16] ©YIJC [Turn over 6

2 In this experiment, you will investigate the oscillatory motion of a loaded metre rule supported at one end by a spring. (a) Secure the cork in the clamp so that the pin is mounted horizontally. Suspend one end of the rule from the pin by passing the pin through the hole in the rule. The rule should be able to pivot around the pin. The other end of the metre rule has a spring attached to it through a small loop of string at the 0.5 cm mark. Hook the other end of the spring to the rod of another clamp as shown in Fig. 2.1. The clamps should be adjusted so that the rule is approximately horizontal. Fig. 2.1 (b) Hang the loop of string onto the rule to suspend a mass of 350 g a distance d from the pin as shown in Fig 2.2. The mass should be about halfway along the rule. Adjust the position of the clamps to make the rule approximately horizontal again. Fig. 2.2 ©YIJC [Turn over spring pin and cork (clamped) stand clamp rule string at 0.5 cm mark of rule mass of 350 g 7

(c) (i) Based on the scale on the metre rule, record the position of the loop attached to the hanging mass, XA. Record the position of the pin, XB. XA = .…….………………......... XB = .…….………………......... [1] (ii) Determine d. d = ………………......... [1] (d) Gently displace the end of the rule so that it performs small oscillations in a vertical plane. Determine the period T of the oscillations. T = ………………......... [2] (e) The equation that relates T and d for this oscillator is where k is 28.0 N m1, M is the mass of the load, L is 1.000 m and C is a constant. Calculate C. C = ………………......... [2] [Total: 6] ©YIJC [Turn over 8

raised board grooves plastic channel wire wrapped around the plastic channel 3 In this experiment, you will investigate the magnetic field produced by an electric current. You are provided with two sets of a wire coiled around a plastic channel. One set is longer than the other. Choose the longer plastic channel and set it on the raised board as shown in Fig. 3.1. (The raised board placed on a pair of wooden blocks is necessary to reduce the effects of the magnetic materials under the table top.) (a) Fig. 3.1 Count and record the number of complete turns N of wire in the coil. N = ………………………… (b) Slide the compass into the plastic channel so that it lies flat on the red circle in the middle of the coil. The coil is to be placed on the raised board. Connect the circuit as shown in Fig. 3.2. Rotate the plastic channel until the arrow of the compass is perpendicular to the channel, as shown in Fig. 3.2. Fig. 3.2 ©YIJC [Turn over 10  3.0 V 9

The distance between the first and last turns of wire is L, as shown in Fig.3.2. Measure and record L. L = ………………………… [1] (c) Close the switch. The compass arrow will rotate through an angle . Measure and record .  = …………………………o Record the ammeter reading I. I = ………………………….. [2] Open the switch. (d) (i) Estimate the percentage uncertainty in your value of . percentage uncertainty = ……………………… [1] (ii) Suggest one significant source of uncertainty in this experiment. ……………………………………………………………………………………………….….… …………………………………………………………………………………………….…….… …………………………………………………………………………………………….…….… ………………………………………………………………………………………….…..…. [1] (iii ) Suggest an improvement that could be made to the experiment to reduce the uncertainty identified in (d)(ii). You may suggest the use of other apparatus or a different procedure. …………………………………………………………………………………………………..… …………………………………………………………………………………………………..… …………………………………………………………………………………………………..… …………………………………………………………………………………………………. [1] ©YIJC [Turn over 10