Paper 4 May 2001 Physics

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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.

UNIVERSITY OF CAMBRIDGE LOCAL EXAMINATIONS SYNDICATE

General Certificate of Education Ordinary Level

PHYSICS 5054/4PAPER 4 Alternative to Practical

MAY/JUNE SESSION 2001 1 hour

Candidates answer on the question paper.No additional materials are required.

This question paper consists of 11 printed pages and 1 blank page.

SB (ND/PW) QF10455/5 UCLES 2001 [Turn over

CandidateCentre Number Number

Candidate Name

FOR EXAMINERS USE

1

2

3

4

5

TOTAL


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1 A small bird lands and stays on a thin horizontal branch of a tree as shown in Fig. 1.1.

Fig.1.1

This produces up and down oscillations of the branch. A student counts and times theoscillations, and finds that the time for 10 oscillations is 7.7s. The bird then flies away.

The student has 12 similar coins. Some of them are attached to the spot where the birdhad landed as shown in Fig. 1.2.

Fig. 1.2

The branch is then made to oscillate. The time for 10 oscillations is obtained with different

numbers of coins attached to the branch.

For

Examiners

Use

branch

branch

sticky tape

coins


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The students results are shown in the table.

Using a balance, the student finds that the mass of 12 coins is 90 g.

(a) Complete the table by giving the missing information in the mass column. [2]

(b) By using the values given in the table, complete the following statement about themass Xof the bird.

X is greater than ..................... g but less than ..................... g.

[1]

(c) (i) State the graph that you would plot to help you determine the value of X.

.................................................................................................................................

(ii) Explain how you would obtain the value for X from your graph.

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.............................................................................................................................[3]

For

Examiners

Use

object on number of time/s mass ofthe branch oscillations object / g

nothing 10 4.5 0

2 coins 10 6.4

4 coins 10 7.3

bird 10 7.7 X

6 coins 10 8.0

8 coins 10 8.5


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2 When you blow into a bottle, as shown in Fig.2.1, a loud sound may be heard.

Fig.2.1

You can also make a loud sound using the apparatus shown in Fig. 2.2.

Fig.2.2

The output frequency of the signal generator can be changed. For a given volume Va of air,the sound is loud for only one value of frequency f. Your teacher asks you to find out howthe value of the volume Va of air in the bottle affects the frequency at which a loud sound isheard. You pour a known volume Vw of water into the bottle and then determine Va. The

loudspeaker is placed over the open top of the bottle and the frequency of the signalgenerator is adjusted until a loud sound is heard coming from the bottle. All the readingsare recorded, including the volume Vb of water that fills the bottle. Vb is found to be450 cm3.

(a) How can you change the volume of air inside the bottle?

.....................................................................................................................................[1]

(b) What does the volume Va of air, plus the volume Vw of water always equal?

Va + Vw = ....................................................................................................................[1]

For

Examiners

Use

output frequency

output terminalssignal generator

bottle

When full, the bottle

holds a volume of450 cm3 of water

volume of water

volume of air

smallloudspeaker

Va

Vw


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(c) In the experiment, you determine different values of frequency and different volumes ofwater and air. In the space below, draw up a table in which you could record all theobservations you need to make.

[4]

For

Examiners

Use


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3 A student makes an electromagnet by wrapping wire around an iron nail. In one experimentthe length of wire used makes a coil of 40 turns. The coil is connected in a series circuit asshown in Fig.3.1.

Fig.3.1

The student uses the variable resistor to obtain six different values of current through thecoil. For each value of current, the strength of the electromagnet is measured by thenumber N of paper clips that the nail can pick up. Three trials are performed and theaverage number of clips picked up is determined.

The students values are given in the Table 1 below.

Table 1

(a) Explain why you think that it was a good experimental procedure to take an average ofthe values obtained for N in the three trials.

.........................................................................................................................................

.........................................................................................................................................

.....................................................................................................................................[1]

For

Examiners

Use

nail A

paper clips

number of turns 40

current / A number Nof paper clips average numbertrial 1 trial 2 trial 3 of paper clips

0.5 1 0 0 0.3

1.0 6 9 6 7.0

1.5 12 15 13 13.3

2.0 24 26 23 24.3

2.5 36 37 34 35.7

3.0 37 53 41 43.7


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(b) (i) Complete Table 2 below.

Table 2[2]

(ii) With reference to Table 2 explain how you know that the strength of theelectromagnet is not directly proportional to the magnitude of the current throughthe coil.

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.............................................................................................................................[2]

(c) Table 1 shows that for a current of 3.0 A the first two values for N are 37 and 53.The number 53 is 43% larger than 37. Suggest one reason why there is such a largedifference between the number of clips.

.........................................................................................................................................

.........................................................................................................................................

.....................................................................................................................................[1]

For

Examiners

Use

change in current through change in average number ofthe coil paper clips picked up

from 0 to 1.0 A 7.0

from 1.0A to 2.0A

from 2.0A to 3.0A


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4 The thermometer in Fig. 4.1 is a full-size diagram of a centigrade thermometer.

Fig. 4.1

(a) What range of temperatures may be measured using this thermometer?

temperature range = ...................................................................................................[1]

(b) On Fig. 4.1 mark the lower fixed point with the letter L and the upper fixed point withthe letter U. [1]

(c) You dissolve 15 g of common salt in 200 cm3 of water. The salt becomes what isknown as a dissolved impurity. The solution is used to discover the effect of the

dissolved impurity on the boiling point of water.

Further amounts of salt are added and the boiling point determined for each mass.The graph of Fig.4.2 represents the results of the experiment.

For

Examiners

Use

-10

0

10

20

30

40

50

6

0

70

80

90

100

C

10


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Fig.4.2

At the beginning of the experiment the salt dissolves very quickly. It takes longer asmore salt is added. At the point marked Q on the graph, not all the salt is dissolved.

Describe how the boiling point is changed by the presence of salt as a dissolvedimpurity. In your description, suggest what has happened at the points P and Q.

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.....................................................................................................................................[3]

(d) When determining the upper fixed point of the thermometer it is held in steam.Suggest a reason for this.

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.....................................................................................................................................[1]

For

Examiners

Use

99

100

101

102

103

104

105

106

107

108

boiling point/C

0 10 20 30 40 50 60 70 80mass/g

x

x

x

x xQP


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For

Examiners

Use

5 A student is using a digital ohmmeter. The meter measures directly the resistance of anelectric component. Fig. 5.1 shows the use of the ohmmeter to measure the resistance of athermistor at different temperatures.

Fig.5.1

The temperature of the oil is increased slowly and the resistance obtained at suitabletemperatures. The readings are given in the table below.

(a) On page 11 plot the graph of resistance/ (y-axis) against temperature/ C (x-axis).

(Please note the instruction about using the graph paper. This is given on the graphpaper.)

Draw the best smooth curve for the points. [4]

(b) (i) The thermometer measures the temperature of the oil. How would you performthe experiment to ensure that the thermistor is at the same temperature as theoil?

.................................................................................................................................

.................................................................................................................................

(ii) How could you make a parallax error when taking the readings?

.................................................................................................................................

.............................................................................................................................[2]

thermometer

thermistor

heater

oil

ohmmeter112

temperature/C 22 29 40 52 63 72 82 92 102

resistance/ 350 290 205 150 110 84 70 55 40


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Paper 4 May 2001 Physics