SULIT 1 4531/3

JABATAN PELAJARAN NEGERI JOHOR

PEPERIKSAAN PERCUBAANSIJIL PELAJARAN MALAYSIA 2007

FIZIK

Kertas 3

PERATURAN PEMARKAHAN

Kertas soalan ini mengandungi 6 halaman bercetak .

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SULIT4531/3(PP)FizikKertas 3September2007

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MARKING SCHEME PHYSICS PAPER 3 (2007)No. Answer Marks

1 (a) (i) Object distance, u 1 (ii) Imej distance, v 1

(iii) Focal length 1 (b)

u /cm v /cm 1/u(cm -1)

1/v(cm -1)

34.0 14.2 0.029 0.07030.0 15.0 0.033 0.06726.0 16.3 0.038 0.06320.0 20.0 0.050 0.05016.0 26.7 0.063 0.037

Tabulate data1. Shows a table which have u , v, 1/u and 1/v2. State the correct unit for 3. u , v, 1/u and 1/v3. All values of v are correct 4. Values of 1/u are consistent to 3 decimal places.5. Values of 1/v are consistent to 3 decimal places.

11211

(c) Draw the graph of 1/v against 1/u

1. The responding variable, 1/v at y axis, the manipulated variable, 1/u at x axis States the unit of the variable correctly2. Both axis with the even and uniform scale 3. 5 points correctly plotted4. A smooth best fit straight line5. Minimum size of the graph is 10 cm x 8 cm

No of ticks √ Marks7 5

5,6 43,4 32 21 1

11111

(d) 1/v is decreases linearly to 1/u 1

(e) Put on the curtain to avoid excess light from outside. The position of the eyes must be perpendicular to the reading

taken to avoid parallax error.

1

TOTAL 16

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2 (a) (i) The potential difference decreases linearly. 1 (ii) 1. Extrapolation of the graf.

2. V = 3.5V11

(iii) Electromotive force 1 (iv) Voltmeter 1 (b) 1. Shows the triangle with an acceptable/

minimum size 8 cm x 8 cm2. Substitute correctly - (1.5 – 3.5) / (1.2 -0.0)3. States the value of gradient and its unit - 1.67 VA -1 // Ω.

1

1

1

(c)

1. Show the vertical line from I= 0.80A until touches the graph then horizontal line until it touches the V axis.2. V = 2.15V

1

1

(d) 1. E = I(R + r)

3.5 = 0.80(R + 1.67)2. R = 2 .71Ω

11

TOTAL 12

SECTION BNO ANSWER Marks

3(a) Inference :

The volume of the gas depends on the pressure which acts on it.

1

(b) Hypothesis:

The smaller the pressure, the larger is the volume of a fixed mass of gas. /

The volume of a gas varies inversely with its pressure.

1

(c)

(i)

Aim : To investigate the relationship between the pressure and volume

for a fixed mass of gas at a constant temperature. 1

(ii) Variables : Manipulated : Gas volume, V

Responding : Gas pressure, P

Fixed : Gas temperature,T or mass of gas, m

1

1

(iii) Apparatus : Glass syringe, a short rubber tube and Bourdon gauge 1

(iv) Arrangement of apparatus:

1

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(v) Procedure:

1. The apparatus is set up as shown in the diagram

above.

2. The piston of the syringe is adjusted until the volume of air in the

syringe is 100 cm3 at atmospheric pressure.

3. The syringe is connected to a Bourdon gauge and the pressure of the

air in the syringe is observed and recorded.

4. The piston is then pushed in so that the volume of air trapped is 90

cm3. The pressure is again recorded, this procedure is repeated for

enclosed volumes of 80cm3, 70 cm3 and 60 cm3.

1

1

1

(vi)

Volume V / cm3

/ cm-3 Pressure P / Nm-2

100

90

80

70

60

*colum PV or P (1/V)

1

(vii)

Pressure of a fixed mass of gas is inversely proportional to its volume.

1

TOTAL 12

4(a) Inference :

The resistance of a metal conductor depends on the temperature.

1

(b) Hypothesis:

The resistance of a metal conductor increases with temperature. 1

(c) Aim : To investigate the effect of temperature on the resistance of a metal

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P/ Nm-2

/ cm3

V/ cm3

P/ Nm-2

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(i) conductor. 1

(ii) Variables : Manipulated : Temperature, T

Responding : Resistance, R

Fixed : Type of material, length and cross-sectional

area of the wire.

1

1

(iii) Apparatus : Iron wire, ammeter, voltmeter, rheostat, U- shaped glass rod,

beaker, thermometer, stirrer, electrical power supply, connecting wires,

crocodile clips, Bunsen burner,water, wire gauze and tripod stand.

1

(iv) Arrangement of apparatus:

1

(v) Procedure:1. The length of fine iron wire is wound around a U-shaped glass rod to

form a coiled resistor and the apparatus is set up as shown in the diagram above.

2. The water is heated to a temperature of 30oC , the current is maintained at a value of 0.5 A using the rheostat and the reading of the voltmeter is recorded.

3. The experiment is repeated with the temperature raised to 40oC , 50oC, 60oC, 70oC and 80oC.

4. The corresponding value of the resistance is calculated for

each of the above temperatures.

1

1

1

(vi) Temperature T /oC Potential difference

V/ V

Resistance R /

ohms

30

40

50

60

70

1

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80

(vii)

1

TOTAL 12

END OF MAKING SCHEME

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R / ohms

/0C