2021 H2 Prelim Phy P4

Name : Centre/Index Number: Class: DUNMAN HIGH SCHOOL Preliminary Examination Year 6 H2 PHYSICS Paper 4 Practical Candidates answer on the Question Paper 9749/04 27 August 2021 2 hours 30 minutes READ THESE INSTRUCTIONS FIRST Write your centre number, index number, name and class at the top of this page. Give details of the practical shift and laboratory where appropriate, in the boxes provided. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions 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. 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. © DHS 2021 9749/04 [Turn over This document consists of 25 printed pages and 1 blank page. This document consists of 18 printed pages and 0 blank page. Shift Laboratory For Examiner’s Use 1 14 2 10 3 19 4 12 Total 55

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ForExaminer’sUse 3 1 In this experiment, you will investigate the oscillations of a square shape. (a) (i) Bend the wire to form a square shape so that the length L of each side is approximately 12 cm, as shown in Fig. 1.1. Fig. 1.1 Use the wire cutter to remove any excess wire. Measure and record L. L = ………………………………. [1] (ii) Estimate the percentage uncertainty in your value of L. percentage uncertainty = ………………………………. [1] © DHS 2021 9749/04 [Turn over

ForExaminer’sUse 4 (b) (i) Place the cork in the clamp and attach the clamp to the stand using the boss. Hang the square wire from the pin as shown in Fig. 1.2. Fig. 1.2 Gently displace the square wire and release it so that it oscillates as shown in Fig. 1.3. Fig. 1.3 © DHS 2021 9749/04

ForExaminer’sUse 5 Determine the period T of the oscillations. T = ………………………………. [3] (ii) Calculate T2. T2 = ………………………………. [1] (iii) Justify the number of significant figures you have given for your value of T2. ....…..…..……………………………………………………………………………………….. …..……..……………………………………………………………………………………….. …..…………………………………………………………………………………….......... [1] (c) (i) Remove the square wire from the pin. Form a new square shape from the wire so that L is approximately 6 cm. Use the wire cutter to remove any excess wire. Measure and record L. L = ………………………………. [1] (ii) Repeat (b)(i) and (b)(ii). T = …………………………………... T2 = ………………………………. [1] © DHS 2021 9749/04 [Turn over

ForExaminer’sUse 6 (d) It is suggested that the relationship between T and L is where k is a constant. (i) Use your values from (a)(i), (b)(ii), (c)(i) and (c)(ii) to determine two values of k. Give your values of k to an appropriate number of significant figures. first value of k = ……………………………. second value of k = …………….……………… [2] (ii) State and explain whether the results of your experiment support the suggested relationship in (d). Justify your conclusion by referring to your values in (a)(ii). ……..………………………………………………………………………………………... …..…………………………………………………………………………………………... ….…………………………………………………………………………………..…… [2] (e) A value for the acceleration of free fall g near the surface of the Earth is given by Use your second value of k to calculate a value for g. g = ……………………………. m s-2 [1] [Total: 14 marks] © DHS 2021 9749/04

ForExaminer’sUse 7 2 In this experiment, you will investigate combinations of resistors in an electrical circuit. (a) You have been provided with three identical resistors A, B and C. Take measurements to determine the resistance of each resistor. The resistance of resistor A is RA. The resistance of resistor B is RB. The resistance of resistor C is RC. RA = ...….........…………………. RB = ...….........…………………. RC = ...….........…………………. [2] (b) Set up the circuit as shown in Fig. 2.1 with resistor A between F and G. Fig. 2.1 Record the total resistance R between F and G. R = ...….........…………………. Close the switch. Record the ammeter reading I. I = ...….........…………………. [1] Open the switch. © DHS 2021 9749/04 [Turn over

ForExaminer’sUse 8 (c) Use various arrangements of the three resistors A, B and C to provide six other different total resistances between F and G. For each arrangement, record R and I in a table. Include values of (b) and 1 I in your table. [5] (d) It is suggested that the quantities I and R are related by the equation E = I (R + X) where E is the electromotive force (e.m.f.) of the power supply and X is the resistance of resistor X. Suggest how you would use the data collected in (c) to determine the value of X. …………..………………………………………………………………………………………... …………..………………………………………………………………………………………... …………..………………………………………………………………………………………... …………..…………………………………………………………………………………… [2] [Total: 10 marks] © DHS 2021 9749/04

ForExaminer’sUse 9 3 In this experiment, you will determine the force constant of a spring. (a) You have been provided with three identical springs, attached to a ring. The length of an unstretched spring is S, as shown in Fig. 3.1. Measure and record S for one of the springs using a vernier calliper. Fig. 3.1 S = ……………………………. [1] © DHS 2021 9749/04 [Turn over

ForExaminer’sUse 10 (b) (i) Set up the apparatus as shown in Fig. 3.2. Fig. 3.2 The extended length of the double spring is S1 and the extended length of the single spring is S2. The extensions are p and q where p = S1 – 2S and q = S2 – S. (ii) Hang appropriate masses on the mass hanger so that m is 400 g. (iii) Adjust the apparatus so that the angle between the springs is 90. Measure and record S1 and S2 using a metre ruler. S1 = ……………………………. S2 = ……………………………. [1] (iv) Calculate p and q. p = ……………………………. q = ……………………………. [1] © DHS 2021 9749/04 m