2023 XMS PRELIM P3 QP

2 6091/Physics /Paper 3/2023 Prelim For Examiner’s Use Section A 1 In this experiment, you will investigate the refraction of light in a transparent block. You have been provided with  a transparent block marked with a spot,  a light source with a slit,  an A4 piece of card (Do NOT write on it),  a ruler,  a protractor. (a) Fig. 1.1 is on page 3 of your Question Paper. Turn on the light source to illuminate the slit. On Fig. 1.1:  position the illuminated slit at the top of the page so that a single ray of light is along the line LM. You may hold the A4 piece of card above the set-up to block some light from the surroundings in order to see the ray of light more clearly.  place the block inside the area marked ABCD with the short edges of the block parallel to LM.  adjust the position of the block so that the spot in the centre of the block is directly above point S on Fig. 1.1.  mark the point where the ray of light crosses the line XY; label this point W. [1] (b) Rotate the block slowly through approximately 30˚ about point S. Keep the spot in the centre of the block directly above point S. (i) Describe the relationship between the angle of rotation of the block and the displacement of light from point W. ……………………………………………………………………………………. ……………………………………………………………………………………. [1] (ii) Describe how the direction of rotation of the block affects the displacement of the ray of light along the line XY. ……………………………………………………………………………………. ……………………………………………………………………………………. [1] (c) Explain why (b) cannot be answered when the block is rotated through large angles approaching 90˚. …………………………………………………………………………………………… …………………………………………………………………………………………… [1]

3 6091/Physics /Paper 3/2023 Prelim For Examiner’s Use Fig. 1.1

4 6091/Physics /Paper 3/2023 Prelim For Examiner’s Use (d) A student claims that the displacement of the ray from point W is directly proportional to the angle of rotation of the block about point S. Plan an experiment to find out if the student’s claim is correct. In your plan, you should:  state the quantities that you will keep constant  describe in detail how you will perform the experiment  sketch the graph that you would obtain if the suggested relationship is correct. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. ………………………………………………………………………………………..…. [6]

5 6091/Physics /Paper 3/2023 Prelim For Examiner’s Use 2 In this experiment, you will investigate the mass and volume of a dry cell. You have been provided with  a dry cell  a ruler  two set squares  an electronic balance (a) (i) Describe one precaution you must take before measuring the mass of the dry cell using an electronic balance. ……………………………………………………………………………………. ……………………………………………………………………………………. [1] (ii) Measure and record the mass of the dry cell. mass = …………………………. [1] (b) (i) Draw a labelled diagram to show how to use a ruler and set squares to measure the diameter of the dry cell. [2] (ii) Measure and record the diameter d of the dry cell. d = …………………………. [1] (c) (i) Measure and record the total length l of the dry cell, as shown in Fig. 2.1. Fig. 2.1 (not to scale) I = …………………………. [1] l

6 6091/Physics /Paper 3/2023 Prelim For Examiner’s Use (ii) Estimate the volume V of the dry cell using the equation 2 4V ld V = …………………………. [1] (iii) The volume calculated in (c)(ii) is an estimate of the volume of the dry cell. Explain why it is only an estimate and why it is a good estimate of the actual volume of the dry cell. ……………………………………………………………………………………. ……………………………………………………………………………………. ……………………………………………………………………………………. [2] (iv) Describe how the method for determining the volume of the dry cell may be improved. ……………………………………………………………………………………. ……………………………………………………………………………………. ……………………………………………………………………………………. [1]

7 6091/Physics /Paper 3/2023 Prelim For Examiner’s Use Section B 3 In this experiment, you will investigate the poten tial difference (p.d.) across a resistance wire. You have been provided with  a resistance wire taped to a metre rule  an ammeter  a voltmeter  a power supply  a switch  a jockey  six leads with crocodile clips at both ends A small length of the resistance wire is coiled around a piece of wood. Fig. 3.1 (a) Assemble the apparatus as shown in Fig. 3.1. Close the switch. Record the current I shown on the ammeter. I = …………………………. [1] (b) Place the jockey on the wire at x = 10 cm. Record the potential difference (p.d.) V shown on the voltmeter. V = …………………………. [1] coil jockey resistance wire metre rule x

8 6091/Physics /Paper 3/2023 Prelim For Examiner’s Use (c) Repeat (b) with the jockey placed on the wire at x = 15 cm, 25 cm, 35 cm, 45 cm, 60 cm, 65 cm, 75 cm, 85 cm and 90 cm. Open the switch. Record your values for V and x in a suitable table. Include your values from (b). [4] (d) Using the grid provided, plot a graph of V against x. Start your axes at the origin (0,0). The x-axis must start at 0 cm and end at 100 cm. Draw two lines of best fit,  one for x = 10 cm to x = 45 cm, label this A,  one for x = 60 cm to x = 90 cm, label this B. [4] (e) (i) Determine the gradient GA of line A. GA = …………………………. (ii) Determine the p.d. VA when x = 0 cm for line A. VA = …………………………. [2] (f) (i) Determine the gradient GB of line B. GB = …………………………. (ii) Determine the p.d. VB when x = 0 cm for line B. VB = …………………………. [2]

9 6091/Physics /Paper 3/2023 Prelim For Examiner’s Use

10 6091/Physics /Paper 3/2023 Prelim For Examiner’s Use (g) It is suggested that GA should be equal to GB. State whether you agree with this suggestion. Justify your answer by reference to your results. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… [2] (h) (i) An estimate for the length of L of resistance wire in the coil can be determined from the equation 2( ) () BA AB VVL GG   . Determine L. L = …………………………. [2] (ii) Suggest two reasons why the actual length L of the resistance wire in the coil is different from the value calculated in (h)(i). 1. ………………………………………………………………………………… ……………………………………………………………………………………. 2. ……………………………………