2022 RVHS H2 Physics Prelim P4
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School
Anglo-Chinese Junior College**We aren't endorsed by this school
Course
PHY 9749
Subject
Physics
Date
Jan 9, 2025
Pages
20
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River Valley High School Page 1 of 20 H2 Physics 9749JC2 Preliminary Examinations 2022 RIVER VALLEY HIGH SCHOOLJC2 PRELIMINARY EXAMINATIONSH2 PHYSICS 9749 PAPER 4 23AUG 2022 2HRS 30MINCANDIDATE NAME CENTRE NUMBER S INDEX NUMBERCLASS 2 1 J INSTRUCTIONS TO CANDIDATES DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO.Read these notes carefully. Write your name, class and index number above.Candidates answer 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. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer allquestions. The number of marks is given in brackets [ ] at the end of each question or part question. SHIFT LABORATORY FOR EXAMINERS’ USE1 / 10 2 / 113 / 22 4 / 12 TOTAL / 55 This document consists of 19printed pages and 1blank page.
River Valley High School Page 2 of 20 H2 Physics 9749JC2 Preliminary Examinations 2022 1 This experiment is investigating the current in a circuit. Set up the circuit as shown in Fig. 1.1. The resistor r is used to model the effect of internal resistance in the two batteries. Eis the sum of the electromotive force (e.m.f.) of the two batteries. Fig. 1.1 Resistors, each of resistance R, are connected in parallel between P and Q. The current Iis measured. The experiment is repeated for different numbers nof resistors between P and Q. It is suggested that Iand nare related by the equation RErn=+IE
River Valley High School Page 3 of 20 H2 Physics 9749JC2 Preliminary Examinations 2022 (a) (i) Measure the current Ifor n= 2 and n= 3. Record your measurements in Fig. 1.2. nI/ mA 1n11/ A−I2 3 4 70.4 5 81.6 6 87.2 7 95.6 Fig. 1.2 [1] (ii) The values of current for n= 4 to n= 7 are given in Fig. 1.2. Calculate and record the values of 1nand 11/ A−Iin Fig. 1.2. [1] (iii) The absolute uncertainty of the measurement of Ican be taken to be ± 2 mA. For your values of Iwhen n= 3, determine the percentage uncertainty of 1I.percentage uncertainty = …………………………[2]
River Valley High School Page 4 of 20 H2 Physics 9749JC2 Preliminary Examinations 2022 (b) When1Iis plotted against1n, determine expressions for the gradient and the y-intercept. gradient = …………………………y-intercept = …………………………[1]
River Valley High School Page 5 of 20 H2 Physics 9749JC2 Preliminary Examinations 2022 (c) (i) Plot a graph of 1Ion the y-axis against 1non the x-axis on Fig. 1.3. Fig. 1.3 [1] 11/ A−I1n0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50
River Valley High School Page 6 of 20 H2 Physics 9749JC2 Preliminary Examinations 2022 (ii)Determine values for the gradient and the y-intercept. gradient=…………………………y-intercept=…………………………[2] (iii) Use your answer in (b)and (c)(ii)to determine the ratio of Rr. Rr=…………………………[1] (iv)Over time, the internal resistance rof the batteries may increase. On Fig. 1.3, draw and label line Z to illustrate what would happen if internal resistance of the batteries increases with their e.m.f. remaining constant. [1] [Total: 10]
River Valley High School Page 7 of 20 H2 Physics 9749JC2 Preliminary Examinations 2022 BLANK PAGE
River Valley High School Page 8 of 20 H2 Physics 9749JC2 Preliminary Examinations 2022 2 In this experiment, you will investigate the equilibrium of a metre rule. (a) You have been provided with a metre rule with a string attached to it. Set up the apparatus as shown in Fig. 2.1. Fig. 2.1 Add masses to the mass hanger so that mass mis 80 g. Adjust the pivot so that it is 5 mm from end B of the rule. The distance between the string at endA and the pivot is L. Measure and record L L= ………………………… [1]
River Valley High School Page 9 of 20 H2 Physics 9749JC2 Preliminary Examinations 2022 (b) Adjust the string loop supporting the 100 g mass so that it is approximately 60 cm from end A. Hold the rule at end A so that the rule is approximately horizontal. Adjust the position of the string loop to find the position where end A is just about to move upwards when the rule is released. The distance between the string at end A and the string loop is y1as shown in Fig. 2.2. Fig. 2.2 Measure and record y1. y1= …………………………Adjust the position of the string loop to find the position where end A is just about to move downwards when the rule is released. The distance between the string at end A and the string loop is y2Measure and record y2. y2= …………………………Calculate y where y=y1+y22y= …………………………[1]
River Valley High School Page 10 of 20 H2 Physics 9749JC2 Preliminary Examinations 2022 (c) Increase mby adding the other masses. Measure the new values of y1and y2. Repeat until you have five sets of values of m, y1and y2. Record your results in a table. Include values of yin your table. [4] (d) (i) Plot a graph of yon the y-axis against mon the x-axis. (ii) Draw the straight line of best fit.. (iii) Determine the gradient and y-intercept of this line. gradient = …………………………y-intercept = …………………………[5]
River Valley High School Page 11 of 20 H2 Physics 9749JC2 Preliminary Examinations 2022 [Total: 11]
River Valley High School Page 12 of 20 H2 Physics 9749JC2 Preliminary Examinations 2022 3 A designer for playground is exploring a new type of ride that is suitable for two users of similar masses. In this experiment, you will investigate the model for such a ride. (a) (i) Using the short wire, make a sharp bend at its centre so that the angle θbetween the straight part of the wire is about 60° as shown in Fig. 3.1. Fig. 3.1 (ii) Measure and record the diameter dof the short wire as shown in Fig. 3.1. d = …………………………[1] (iii) Measure and record the angle θ. θ= …………………………[1] (iv) Estimate the percentage uncertainty in this measurement of θ. Show your working clearly.percentage uncertainty in θ= …………………………[1] (v) Calculate 2sin2.2sin2= …………………………[1] θ
River Valley High School Page 13 of 20 H2 Physics 9749JC2 Preliminary Examinations 2022 (b) Set up the apparatus as shown in Fig. 3.2. Secure the wooden rod to the boss of the retort stand. The top of the spring passes through the wooden rod. The sharp bend of the wire is resting at the bottom of the spring. Secure the masses on the ends of the wire with sufficient tapes.Each mass represents a child on the ride. front view side view Fig. 3.2 (i) The extension eof the spring is the length of the spring when the wire with masses is loaded at the bottom of the spring minus the unstretched length of the spring. Determine eand estimate the percentage uncertainty in your value of e. e= …………………………percentage uncertainty in e= …………………………[2] wooden rod stand boss mass spring wire mass
River Valley High School Page 14 of 20 H2 Physics 9749JC2 Preliminary Examinations 2022 (ii) Move one of the masses so that the wire turns through approximately 180oabout vertical axis. Release the mass. The wire will oscillate about a vertical axis as shown in Fig. 3.3. top view Fig. 3.3 (iii) Determine the time tfor the wire to make 5 complete swings. t= …………………………[1] (c) Bend the wire such that θ= 30°. The arms of the wire must remain straight. Repeat (a)(iii), (a)(v)and (b)(iii). θ= …………………………2sin2= …………………………t= …………………………[2] axis of rotation wire mass mass one complete swing
River Valley High School Page 15 of 20 H2 Physics 9749JC2 Preliminary Examinations 2022 (d) It is suggested that the quantities tand θare related by the equation 22sin2tpke=+where kis a constant and p= 20 s2. (i) Use your values from (a)(v), (b)(i), (b)(iii)and (c)to determine two values of k. Give your values of kto an appropriate number of significant figures. first value of k= …………………………second value of k= …………………………[2] (ii) State whether the results of your experiment support the suggested relationship in (d). Justify your conclusion by referring to your values in (a)(iv)and (b)(i). ……………………………………………………………………………………...………………………………………………………………………………………...……………………………………………………………………………………[1] (iii) It is suggested that the masses attached to the wire affects the values of t. Suggest one other factor that may affect the value of t. ……………………………………………………………………………………...……………………………………………………………………………………[1]
River Valley High School Page 16 of 20 H2 Physics 9749JC2 Preliminary Examinations 2022 (e) Plan an investigation to determine whether the time tis directly proportional to the masses attached to the end of the metal wire. Your account should include: •your experimental procedure •control of variables •how your results can be analysed to reach the conclusion. •why you might have difficulties using masses with very small values and very large values. ……………………………………………………………………………………...…...…..……………………………………………………………………………………...…...…..……………………………………………………………………………………...…...…..……………………………………………………………………………………...…...…..……………………………………………………………………………………...…...…..……………………………………………………………………………………...…...…..……………………………………………………………………………………...…...…..……………………………………………………………………………………...…...…..……………………………………………………………………………………...…...…..……………………………………………………………………………………...…...…..……………………………………………………………………………………...…...…..……………………………………………………………………………………...…...…..……………………………………………………………………………………...…...…..……………………………………………………………………………………...….[5]
River Valley High School Page 17 of 20 H2 Physics 9749JC2 Preliminary Examinations 2022 (f) (i) Replace the short metal wire with a long metal wireand set up the apparatus in Fig. 3.2. The angle θbetween the straight parts of the wire is about 60°. Lift up the mass at one end and release it so that it performs small oscillations in a vertical plane as shown in Fig. 3.4. Fig. 3.4Determine the period Twith and without masses at the end of the wire. Tabulate your results. [3] (ii) Suggest a reason for the trend observed in your results in (f)(i). ……………………………………………………………………………………...……………………………………………………………………………………[1] [Total: 22]
River Valley High School Page 18 of 20 H2 Physics 9749JC2 Preliminary Examinations 2022 4 When a thin capillary tube of radius ris inserted vertically into a liquid of density 𝜌, the liquid rises into the tube a distance habove the liquid level as shown in Fig. 4.1. Fig. 4.1It is suggested that his related to rand 𝜌by the relationship h = k rp𝜌qwhere k, pand qare constants. You are given a number of capillary tubes of different dimensions. Plan a laboratory experiment to test the relationship between h, rand 𝜌. Explain how your results could be used to determine values of pand q. You should draw a diagram showing the arrangement of your equipment. In your account you should pay particular attention to: •the equipment you would use •the procedure to be followed •how the density of the liquid can be varied and measured •the control of variables •any precautions that should be taken to improve the accuracy and safety of the experiment. h
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