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This question paper consists of 6 printed pages, 2 blank pages and an inserted answer booklet.

SB (KG/JB) QF92360/2 UCLES 1999 [Turn over

UNIVERSITY OF CAMBRIDGE LOCAL EXAMINATIONS SYNDICATE

General Certificate of Education Ordinary Level

PHYSICS 5054/3PAPER 3 Practical Test

Monday 21 JUNE 1999 Morning 2 hours

Candidates answer on the enclosed answer booklet.Additional materials:

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

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 maximum of20 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.

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Section A

Answer all the questions in this section.

1 In this experiment, you will determine the density of the glass from which some spheres are made.Record your answers on page 2 of your Answer Booklet.

(a) (i) Using the top pan balance, measure and record

1. the mass mp of the empty petri dish,

2. the mass ms of the petri dish and 20 spheres.

(ii) Hence determine the average mass mof a single sphere.

(b) Explain why you were instructed to use 20 spheres rather than a single sphere.

(c) Place a number of spheres into the groove in the block of wood.

(i) Record the number Nof spheres used.

(ii) Make sure that the spheres are touching. Measure and record the total length Loccupied by the spheres.

(iii) Determine the mean diameter dof a sphere, given that

d= .

(d) Find the density of glass, given that

density = .6md3

LN

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2 You are to estimate the temperature of the flame of a Bunsen burner by applying the law ofconservation of energy when a screw, heated in the flame, is plunged into a beaker of water.Record your answers on page 3 of your Answer Booklet.

(a) Measure 100 cm3 of water and pour it into the beaker labelled A. Given that 1 cm3 of waterhas a mass of 1 g, record the mass mw of water in the beaker.

(b) Measure and record the temperature 1 of this water.

(c) Adjust the air supply to the Bunsen burner to create the roaring flame. Using the tongs, holdthe screw in the hottest part of the flame. After approximately 1 minute, transfer the screw tothe beaker of water. Measure and record the final temperature 2 of the water.

(d) Determine the energy Qgained by the water, given that

Q= mwcw(2 1),

where cw

= specific heat capacity of water

= 4200J/(kgK).

(e) The screw loses the same amount of energy Q as determined in (d). Find the fall intemperature Tof the screw given that

T= ,

where ms = mass of the screw which is given on the card

and cs = specific heat capacity of the material of the screw = 420 J/(kgK).

(f) Use your answers to estimate the temperature of the flame of a Bunsen burner.

(g) Suggest one source of error in this experiment.

Qmscs

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3 You are to measure the angle through which a reflected ray is turned when a mirror is rotatedthrough an angle of 25. Use page 4 of your Answer Booklet.

(a) From which surface of the mirror is most of the light reflected?

(b) On page 4 of the Answer Booklet, the line ABC will represent the position of the reflecting

surface of the mirror.

(i) Draw a normal to the line AC at B in the direction of the bottom of the page.

(ii) Draw a line through B to represent a ray with an angle of incidence of 35.

(c) (i) Place your Answer Booklet on the soft-board and place the reflecting surface of themirror along ABC.

(ii) Place two pins vertically on the line marking the position of the incident ray. Look fromthe opposite side of the normal and place two pins in line with the images of the first twopins. These pins mark the path of the reflected ray.

(iii) Remove the mirror and pins, and draw in the path of the reflected ray.

(d) Draw a line XY through B at an angle of 25 to ABC, as shown in Fig. 3.1.

Fig. 3.1

(e) Place the reflecting surface of the mirror along the line XY and place two pins on the line ofthe original incident ray. Look at the mirror again and place two further pins in line with theimages of the pins on the incident ray. These pins mark the new path of the reflected ray.Remove the mirror and pins, and draw in the path of the new reflected ray.

(f) Measure and record the angle between the two paths of the reflected ray.

AB

C

Y

X

25

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Section B

4 You are to use a length of rubber as a force meter. You are to weigh a block of plasticine in air andin water to determine a value for the density of plasticine. Use pages 5 to 7 of your AnswerBooklet.

The length of rubber is hanging vertically, as shown in Fig. 4.1.

Fig. 4.1

(a) (i) Using the second stand and clamp, set the metre rule vertically, close to the length ofrubber, with the zero end of the rule on the bench.

(ii) Measure and record the height ho (in mm) of the bottom of the length of rubber above the

bench.

(b) Explain

(i) how you ensured that the metre rule was vertical,

(ii) any special precautions taken to ensure that ho was measured accurately.

(c) (i) Hang a 10 g mass hanger (which corresponds to a weight Wof 0.1 N) from the paper clipat the bottom of the rubber.

(ii) Measure and record the new height h (in mm) of the bottom of the rubber above thebench.

(iii) Calculate (ho h) which is the extension eof the rubber.

(d) (i) Repeat (c) for a range of values of Wup to 0.8N.

(ii) Tabulate all your measurements of h, including those in (c). Include in your table thecorresponding values of eand W.

(e) Plot a graph of e/mm (y-axis) against W/N (x-axis).

(f) (i) Replace the masses suspended from the rubber with the plasticine block. Determine theextension ep due to the plasticine.

(ii) Use your graph to find the corresponding weight Wp. Record this weight.

stand

paper clip

paper clip

rubber

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(g) (i) Place the beaker of water underneath the suspended plasticine block, as shown inFig. 4.2. Raise the beaker of water until the block is fully submerged but not touching thebeaker, as shown in Fig. 4.3.

Fig. 4.2 Fig. 4.3

(ii) Determine the corresponding extension ew of the rubber when the plasticine is fullysubmerged in the water.

(iii) Use your graph to find the corresponding weight Ww. Record this weight.

(h) Calculate the density of plasticine, given that

density = ,

where k= 1.00 g/cm3.

k WpWp Ww

plasticineblock

beaker

beaker heldin positionwhilstreading taken

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