TIME 2 hours

INSTRUCTIONS TO CANDIDATES

Write your name, Centre number and candidate number in the spaces provided on the answer booklet.

Answer all questions.

Write your answers in the spaces provided in the answer booklet.

For each of the questions in Section A, you will be allowed to work with the apparatus for a maximumof 20 minutes. For the question in Section B, you will be allowed to work with the apparatus for amaximum of 1 hour.

You are expected to record all your observations as soon as these observations are made. All of youranswers should be written in the answer booklet; scrap paper should not be used.

An account of the method of carrying out the experiments is not required.

At the end of the examination, hand in only the answer booklet.

INFORMATION FOR CANDIDATES

Graph paper is provided in the enclosed answer booklet. Additional sheets of graph paper should beused only if it is necessary to do so.

Any additional sheets should be attached firmly to the answer booklet.

UNIVERSITY OF CAMBRIDGE LOCAL EXAMINATIONS SYNDICATEGeneral Certificate of Education Ordinary Level

PHYSICS 5054/3PAPER 3 Practical TestMAY/JUNE SESSION 2001 2 hours

Candidates answer on the enclosed answer booklet.Additional materials:

As listed in Instructions to SupervisorsElectronic calculator and/or Mathematical tablesGraph paper

This question paper consists of 5 printed pages, 3 blank pages and an inserted answer booklet.

ND/PW QF10454/2© UCLES 2001 [Turn over

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Section A

Answer all the questions in this section.

1 In this experiment, you will determine the density of the solution. Record your answers on page 2of your answer booklet.

You are to use the apparatus provided to determine the density of the solution which is providedin the beaker. You do not have to use the whole sample. You will use the relationship

density = mass .volume

(a) In your answer booklet you should describe carefully the method used to find both the massand the volume of the part of the solution which you used. You may include diagrams if youwish.

(b) (i) Record all your measurements.

(ii) Calculate the density of the solution.

(c) Return the solution to the beaker after completing your measurements.

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2 In this experiment, you will determine the focal length of a lens by observing two images formedby the lens. Record your answers on page 3 of your answer booklet.

(a) Set up the apparatus as shown in Fig. 2.1 with the object 20 cm from the lens. Adjust theposition of the screen until a clearly focused image of the cross-wire object is formed on thescreen. Ensure that the light source is in line with the cross-wire object so that the imageformed on the screen is as bright as possible.

Fig. 2.1

(b) Describe fully the image which is formed on the screen.

(c) Measure and record the distance D between the object and the screen.

(d) Without adjusting the position of the screen or the object, move the lens until a second clearimage is formed on the screen.

(e) Describe fully the image which is formed on the screen in this case.

(f) Measure and record the distance d through which the lens was moved.

(g) Calculate the focal length f of the lens given that

f = D2 – d2

.4D

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3 In this experiment, you will determine the period of oscillation of a system when masses of 200 gand 400 g are suspended from a spring. Record your answers on page 4 of your answer booklet.

(a) Suspend the spring from the clamp as shown in Fig. 3.1.

Fig. 3.1 Fig. 3.2

(b) Suspend a mass m1 of 200 g from the end of the spring.

(c) Clamp the optics pin in the cork horizontally, level with the base of the mass and to its sideas shown in Fig. 3.2. Pull the mass down approximately 2 cm and release it. The mass willperform vertical oscillations. One complete oscillation of the mass is shown in Fig. 3.2. Takeand record measurements to determine the period T1 of the oscillation of m1.

(d) Replace the 200 g mass with a mass m2 of 400 g and repeat step (c) to find the period T2 ofthe oscillation of m2.

(e) Calculate and .

(f) Use the results from your answer to (e) to suggest a relationship between mass and period.

T12

m1

T22

m2

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Section B

4 In this experiment, you will investigate how the resistance of a length of wire depends on itslength. Use pages 5, 6 and 7 of your answer booklet for your answers.

(a) Draw a circuit diagram of the electrical circuit which has been set up for you.

(b) Close the switch and adjust the current I in the circuit to a value of approximately 0.15 A.Measure and record I.

(c) Using the sliding contact, connect the voltmeter across a length l of 0.500 m of wire. Recordthe voltmeter reading V.

(d) Calculate the resistance R of the wire of this length, given that

R = V .I

(e) Keeping the current constant, measure and record V for a range of values of l. Aftercompleting your readings, open the switch. Tabulate your values of l, V and R.

(f) Plot a graph of R/Ω (y-axis) against l /m (x-axis).

(g) Find the gradient G of your graph.

(h) Write down a conclusion about the relationship between resistance and length. State themeaning of the gradient of your graph.

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