Paper 4 May 1999 Physics

8/14/2019 Paper 4 May 1999 Physics

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This question paper consists of 12 printed pages and 4 blank pages.

SB (SLC/JB) QF92361/1 UCLES 1999 [Turn over

UNIVERSITY OF CAMBRIDGE LOCAL EXAMINATIONS SYNDICATE

General Certificate of Education Ordinary Level

PHYSICS 5054/4PAPER 4 Alternative to Practical

Monday 21 JUNE 1999 Morning 1 hour

Candidates answer on the question paper.Additional materials:

Electronic calculator and/or Mathematical tablesProtractorRuler (300mm)

TIME 1 hour

INSTRUCTIONS TO CANDIDATES

Write your name, Centre number and candidate number in the spaces at the top of this page.

Answer all questions.

Write your answers in the spaces provided on the question paper.

INFORMATION FOR CANDIDATES

The number of marks is given in brackets [ ] at the end of each question or part question.

CandidateCentre Number Number

Candidate Name

FOR EXAMINERS USE

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5

TOTAL


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1 A metal bob attached to a length of thread is held in a clamp as shown in Fig. 1.1. The bob ismade to swing by moving it to one side and then releasing it.

Fig. 1.1

The metre rule is used to measure the distance l between the centre of the bob and theclamp. The stopwatch is used to measure the time t for 20 complete swings. In theexperiment, the time for 20 swings is measured for different values of l. In each case, thetime T for one swing is calculated.

(a) Explain how you would use the metre rule to measure the value of l when l is about90 cm. You should mention any additional apparatus you would use. You may draw adiagram if you wish.

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;

;

rule

bob

thread

clamp

l

1 : 23.8

the stopwatch reads

1 min : 23.8s

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(b) The stopwatch shown in Fig. 1.1 can measure time to the nearest 0.1 s. One value for Twas T= 1.03 s. Why is it desirable to measure the time for at least 20 swings in order todetermine this value of T?

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(c) On Fig. 1.2, show the numbers on the face of the stopwatch when t= 106.6s.

Fig. 1.2[1]

: .

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2 The circuit shown in Fig. 2.1 contains a thermistor which is immersed in oil. The powersupply provides a constant potential difference of 2.0 V.

Fig. 2.1

(a) The table below contains some information about the thermistor. Complete the table,given that I = V/Rand that V= 2.0 V.

[2]

; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ;

; ; ; ; ; ; ; ; ; ; ;

A

V

oilP Q

thermometer

thermistor

2.0V

power supply+

heater

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temperature of thermistor/C 0 50 100

resistance of thermistor/ 100 20 5.0

current through thermistor/A 0.10


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(b) To measure the current, there is a choice of two ammeters X and Y. The scale on theface of each meter is shown in Fig. 2.2.

Fig. 2.2

Which meter would you choose, given that the temperature of the oil is always between0 C and 100C?

choice of meter .....................................

reason for your choice ......................................................................................................

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(c) There is a potential difference between the wires dipping into the oil. This may cause avery small current in the oil from wire P to wire Q. What could you do to the apparatus toshow, experimentally, that this current is very small?

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1

0

12 3

4

5

AMPS

0.1

00.1

0.2 0.30.4

0.5

AMPS

X Y

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3 A small steel ball is dropped through a hole in a card and falls through a clear plastic tubebefore hitting a glass surface, as shown in Fig. 3.1. There is a rubber band on the outside ofthe tube. This band may be moved along the tube.

Fig. 3.1

When the ball bounces on the glass surface, it rises up inside the tube to a height shown ash in Fig. 3.1. The top of the bounce is marked by the position of the rubber band.

In one series of experiments, a ball of mass 1.0 g is dropped from the hole arranged at afixed height of 14.5 cm above different pieces of glass. The thickness t of the glass isdifferent for each piece of glass. The area of the top surface is the same for each piece ofglass. The height hof the bounce is measured each time.

The graph of Fig. 3.2 represents the results of the experiment. On the graph, the thickhorizontal line, at h= 14.5 cm, represents the height of the hole.

;;

cardhole

rubber band

glass surface

clampball

plastic tube

t

h

14.5cm

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Fig. 3.2

(a) One particular piece of glass has a thickness of 20 mm.

(i) Determine the ratio = .

ratio = ......................................

(ii) The potential energy E of the ball when at the hole is given by E= mg x height.

What fraction of this energy is transferred to the glass on impact?

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h14.5

h14.5

height of bounce

height of hole

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

04 8 12 16 20

t/mm

h/cm

height of hole = 14.5cm

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(b) (i) Describe what you would observewhen the ball hits glass of thickness t= 2mm.

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(ii) Comment on the amount of energy transferred to the glass when t= 2mm.

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(c) The area of the top surface of the glass is the same for each piece of glass. Ast increases, what other physical property of the glass increases?

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4 A hot thermometer is allowed to cool on a day when room temperature is 24.0C.Temperature-time observations are taken every 0.25 min (15s). The results of the coolingexperiment are shown in the graph of Fig. 4.1 on page 11.

The excess temperature at any moment is given by

= temperature of the thermometer room temperature.

The excess temperature at the points A and B are

A = 30C,B = 15C.

(a) (i) Near to the points A and B are two broken lines. These lines are shown drawn overa time interval of 0.25min. For each interval, determine the fall F in temperaturewhich occurred.

fall in temperature in 0.25 min for A, FA = .................................................................

fall in temperature in 0.25 min for B, FB = .................................................................

(ii) Determine the ratio A/B and the ratio FA/FB.

A/B = ......................................

FA/FB = ......................................

(iii) Using the values you have obtained in (ii), write a conclusion about the rate ofcooling of the thermometer and its excess temperature. In your answer, give anapproximate relation between these quantities.

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(b) Why is it reasonable to assume that the temperature of the room did not change duringthe experiment?

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(c) The thermometer is held inside a large beaker during the cooling. Why is this goodexperimental practice?

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Fig. 4.1

0 0.5 1.0 1.5 2.0 2.5 3.0 3.520

25

30

35

40

45

50

55

60

65

room temperature = 24.0C

time interval of 0.25min

time interval of 0.25min

A; hA = 30C

B; hB = 15C

temperature

ofthermometer

C

time/min


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5 The apparatus shown in Fig. 5.1 is used in a lens experiment.

Fig. 5.1

The object is a triangular hole cut in a card. The image is formed on the screen.

The height hof the image and the image distance vare measured for different positions ofthe object. The values obtained are shown in the table.

(a) Using the grid on page 13, plot the graph of v/mm (y-axis) against h/mm (x-axis). Drawa straight line which is the best fit for the plotted points. [5]

(b) The rule, shown along the side of the apparatus, is used to determine the values of v.Explain how you would avoid making a parallax error when taking these measurements.You may draw a diagram or draw on Fig. 5.1.

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object

lens

translucentscreen

image onscreen

rule

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v/mm 150 245 310 350 400

h/mm 10 28 43 49 61


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Paper 4 May 1999 Physics