
	Trending ▼ ICSE CBSE 10th ISC CBSE 12th CTET GATE UGC NET Vestibulares ResFinder

GCE MAY 2006 : A2 3B Experimental and Investigative Skills (Session 2)

21 pages, 23 questions, 0 questions with responses, 0 total responses,

	gce	+Fave Message
	Profile Timeline Uploads Q & A

Home > gce >

Instantly get Model Answers to questions on this ResPaper. Try now!
NEW ResPaper Exclusive!

Formatting page ...

ERRATUM NOTICE Advanced General Certificate of Education Physics Paper A2 3B Module 6 Session No. 2 [A2Y33] Wednesday 24 May, Morning INSTRUCTIONS TO TEACHER/SUPERVISOR Before the start of the examination please ask candidates to amend their question paper as follows: There are two amendments to be made to this paper Please turn to page 14 of your question paper. (Pause) Go to the top of the page (Pause) Change the question part (v) to part (d) (Pause) Repeat Please turn to page 14 of your question paper. (Pause) Go to the top of the page (Pause) Change the question part (v) to part (d) (Pause) Please make this change now. Now please turn to page 16 (Pause) Go to the line below the diagram labelled Fig. 3.2 (Pause) Remove the word is after the word from in the middle of the line (Pause) Repeat Now please turn to page 16 (Pause) Go to the line below the diagram labelled Fig. 3.2 (Pause) Remove the word is after the word from in the middle of the line (Pause) This is the end of the announcement. Centre Number 71 Candidate Number ADVANCED General Certificate of Education 2006 assessing Module 6: Experimental and Investigative Skills Session No. 2 A2Y33 Physics Assessment Unit A2 3B [A2Y33] WEDNESDAY 24 MAY TIME 1 hour 30 minutes. INSTRUCTIONS TO CANDIDATES Write your Centre Number and Candidate Number in the spaces provided at the top of this page. Turn to page 3 for further Instructions and Information. For Teacher/Supervisor s use only Question 2 Was the candidate given the pre-connected circuit, or was assistance given in the connection of the candidate s circuit? YES NO For Examiner s use only Question Number 1 2 3 Total Marks A2Y3BaS6 1638 Marks BLANK PAGE A2Y3BaS6 1638 2 [Turn over Instructions to Candidates Answer all the questions in this paper, using this booklet. Rough work and calculations must also be done in this booklet. Except where instructed, do not describe the apparatus or experimental procedures. The Supervisor will tell you the order in which you are to answer the questions. Not more than 28 minutes are to be spent in answering each question, and after 26 minutes you must stop using the apparatus in Questions 1 and 2 so that it can be re-arranged for the next candidate. At the end of the 28-minute period you will be instructed to move to the area set aside for the next question. At the end of the Test a 6-minute period will be provided for you to complete your answer to any question, but you will not have access to the apparatus during this time. Information for Candidates The total mark for this paper is 70. Quality of written communication will be assessed in Question 3. Questions 1 and 2 carry 25 marks each, and Question 3 carries 20 marks. Figures in brackets printed down the right-hand side of pages indicate the marks awarded to each part question. Question 3 contributes to the synoptic assessment of the Specification. In this question, you will need to make and use connections between different areas of physics and to use your knowledge and understanding of more than one area. A2Y3BaS6 1638 3 [Turn over 1 Introduction In this experiment you will investigate standing waves on a wire. Aims The aims of the experiment are (a) to obtain standing wave patterns on a wire under tension, (b) for a standing wave pattern of one loop, establish a relationship between the frequency of the generated wave and the tensioning mass. Apparatus The apparatus shown in Fig. 1.1 has already been set up for you. crocodile clip pulley Signal generator knife edge steel yoke with magnets knife edge crocodile clip wire mass M Fig. 1.1 The length of wire is tensioned with a mass M hung from one end of the wire. A pair of magnets in a steel yoke provides a magnetic field at right angles to the wire which carries an alternating current of known frequency. This makes the wire produce oscillations of small amplitude. A2Y3BaS6 1638 4 [Turn over Procedure Examiner Only Marks Remark The frequency range control and amplitude control of the generator have been preset, and should not be adjusted. Do not move the knife edges. Start with a tensioning mass M of 150 g and the generator frequency at the lowest value in the preset range. Gradually increase the frequency until a single loop appears in the vibrating wire. Adjust the frequency until the amplitude of the loop is a maximum. Note the frequency f at which this maximum occurs, and record the value in Table 1.1. The value should be recorded to an appropriate number of significant figures. Insert suitable units in the heading of the second column of the table. The third and fourth columns will be required later. Without changing the distance between the knife edges, increase the tensioning mass M to 200 g. Adjust the frequency until maximum amplitude is again obtained. Note the frequency f at which the maximum occurs and record it in Table 1.1. Repeat this procedure for masses M of 250 g, 300 g and 350 g. Results (a) Table 1.1 mass M/g frequency f/ 150 200 250 300 350 [7] A2Y3BaS6 1638 5 [Turn over (b) Estimate the experimental uncertainty in the value of f corresponding to a tensioning mass M of 300 g. Explain how you arrive at this estimate. Examiner Only Marks Remark Uncertainty = ______________________________________________ Explanation: _______________________________________________ _________________________________________________________ _________________________________________________________ _______________________________________________________ [3] Theory The relationship between the frequency f of the generated wave and the tensioning mass M is: f = KMn where K is a positive constant and n an index. This equation can be written in the form log10 f = n log10 M + log10 K Analysis (a) You are to draw a linear graph to find the value of the index n in this equation. (i) State the quantities to be plotted on each axis of the graph. Vertical axis: ___________________________________________ Horizontal axis: ______________________________________ [1] (ii) To allow this linear graph to be plotted, it will be necessary to calculate additional quantities from your results. Head the third and fourth columns of Table 1.1 with appropriate labels, and insert values calculated from your results. [3] (iii) On Fig. 1.2 opposite, label the axes of the graph grid and choose suitable scales. Plot the points and draw the best straight line through them. [5] A2Y3BaS6 1638 6 [Turn over Fig. 1.2 A2Y3BaS6 1638 7 [Turn over (iv) From your graph, find the value of the index n. Show clearly how the value is obtained. Enter the value below. n = _______________ Examiner Only Marks Remark [3] (b) From your graph, or by calculation, deduce the frequency of the generated wave which would be required to produce a single loop pattern if the tensioning mass were 225 g. Frequency = ___________ Hz A2Y3BaS6 1638 [3] 8 [Turn over BLANK PAGE (Questions continue overleaf) A2Y3BaS6 1638 9 [Turn over 2 Introduction Aims The aims of the experiment are: (a) to set up a circuit which will be used to determine the resistance of a wire, (b) to measure the e.m.f. of a power source, (c) to obtain the different values of voltage provided by the source when different lengths of resistance wire are in the circuit, (d) to measure the diameter of the resistance wire, (e) to use these values, together with the cross-sectional area, to find the internal resistance of the power source. Apparatus You are provided with a voltmeter, switch, micrometer screw gauge, resistance wire (already attached to a metre rule), power source, connecting wire and crocodile clips. Procedure (a) Set up the circuit shown in Fig. 2.1. internal resistance R Switch V resistance wire L crocodile clip metre rule Fig. 2.1 crocodile clip Using the leads with the crocodile clip at one end, connect one clip to the resistance wire at the zero end of the metre rule. Do not connect the second clip to the resistance wire yet. [2] Examiner Only Marks Remark If you are unable to set up this circuit, ask the Supervisor for assistance. A deduction of 2 marks will be made. A2Y3BaS6 1638 10 [Turn over (b) Using the micrometer screw gauge, obtain accurately the diameter of the resistance wire and record it in Table 2.1. There is a short length of the same wire for you to use to do this. Examiner Only Marks Remark (c) Close the switch and use the voltmeter to measure the e.m.f. E of the power source. Record the value of E in Table 2.1. (d) Open the switch and now connect the second crocodile clip so that the length L is 1.00 m. Close the switch. Record the value of the voltage V in Table 2.1. Do not hold on to the clip while taking the reading, as this may cause fluctuations. Repeat this procedure for lengths L of 0.90 m, 0.80 m, 0.70 m, 0.60 m and 0.50 m. The third and fourth columns of Table 2.2 are for later use. Results Table 2.1 Resistance wire diameter/mm E.m.f. E/V [3] Table 2.2 length L/m voltageV/V 1.00 0.90 0.80 0.70 0.60 0.50 [6] A2Y3BaS6 1638 11 [Turn over Theory Examiner Only Marks Remark The voltage V is related to the length L of resistance wire in use by the following equation: 1 1 1 = B + L E V where B is a positive constant and E is the constant e.m.f. of the power source. Analysis You are to draw a linear graph to find the value of the constant B. (a) To allow this linear graph to be plotted, it will be necessary to calculate additional quantities from your results. Head the third and fourth columns of Table 2.2 with appropriate labels and units, and insert values calculated from your results. [3] (b) On Fig. 2.2 opposite, label the axes of the graph grid and choose suitable scales. Plot the points and draw the best straight line through them. [5] (c) From your graph, find the value of the constant B. Show clearly how the value is obtained. Enter the value, with an appropriate unit, below. B = __________________ Unit: __________________ A2Y3BaS6 1638 [4] 12 [Turn over Fig. 2.2 A2Y3BaS6 1638 13 [Turn over Examiner Only AR (v) It can be shown that B = E Marks Remark where A is the cross-sectional area of the resistance wire, R is the internal resistance of the power source and is the resistivity of the wire. The resistivity of the wire is 4.9 10 7 m. Use your values of B, E and the diameter of the wire to find the internal resistance of the power source. Internal resistance = ________ A2Y3BaS6 1638 [2] 14 [Turn over Where appropriate, your answer to this question should be in continuous prose. You will be assessed on the quality of your written communication. 3 Examiner Only Marks Remark Planning and design question Introduction This question is about investigating some of the properties of a light dependent resistor (LDR) and its uses. An LDR has a resistance which changes significantly with the intensity of illumination. For a certain LDR, the resistance in the dark is 250 k and the resistance in daylight is 6 k . Questions (a) You have been asked to investigate whether or not the LDR obeys Ohm s Law in the dark and then in daylight. The resistance is to be determined using a voltmeter and ammeter method. The power supply available has a fixed 20 V d.c. output. (i) Complete the circuit diagram in Fig. 3.1 to include a potential divider to allow you to vary the voltage across the LDR from 0 to 20 V. Show where the ammeter and voltmeter would be connected. 20 Vd.c. LDR Fig. 3.1 [3] (ii) Write a brief account of how you would perform this experiment. ______________________________________________________ ______________________________________________________ ______________________________________________________ ______________________________________________________ _____________________________________________________ ___________________________________________________ [4] A2Y3BaS6 1638 15 [Turn over (b) Calculate the current in daylight and in the dark when the potential difference is 12.0 V. Light current = ___________ A Dark current = ___________ A Examiner Only Marks Remark [2] Explain why it would not be good practice to use the same analogue ammeter to measure both these currents. _________________________________________________________ _________________________________________________________ _________________________________________________________ ______________________________________________________ [2] (c) The resistance of the LDR depends on light intensity. A calibration graph is available relating the resistance to the light intensity, as shown in Fig. 3.2. light intensity resistance Fig. 3.2 The intensity L a distance x from is a small light source is given by the relation L L = 0 x2 where L0 is the intensity 1 metre from the source. (i) What is the name of this type of relationship? ______________________ A2Y3BaS6 1638 [1] 16 [Turn over (ii) Design an experiment which would allow you to verify this relationship using an LDR, a small light source and a device that measures resistance directly. Examiner Only Marks Remark State what other equipment would be needed, what you would vary and measure, and how you would process the results. Include a diagram of the arrangement. State also a design precaution that you would take to ensure that your results are as accurate as possible. _____________________________________________________ _____________________________________________________ _____________________________________________________ _____________________________________________________ _____________________________________________________ _____________________________________________________ _____________________________________________________ ___________________________________________________ [7] Quality of written communication A2Y3BaS6 1638 [1] 17 [Turn over THIS IS THE END OF THE QUESTION PAPER A2Y3BaS6 1638 18 [Turn over A2Y3BaS6 1638 19 [Turn over S 3/06 2200 302507(171) [Turn over

Formatting page ...

Additional Info : Gce Physics May 2006 Assessment Unit A2 3B, Module 6: Experimental and Investigative Skills (Session 2)
Tags : General Certificate of Education, A Level and AS Level, uk, council for the curriculum examinations and assessment, gce exam papers, gce a level and as level exam papers , gce past questions and answer, gce past question papers, ccea gce past papers, gce ccea past papers

gce chat

Horizontal lines at:
Guest Horizontal lines at:
AutoRM Data:
Box geometries: