Johorskema P3 Trial 2008

SULIT SULIT 4531/3(PP) Fizik Kertas 3 September 2008

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JABATAN PELAJARAN NEGERI JOHOR

PEPERIKSAAN PERCUBAAN SIJIL PELAJARAN MALAYSIA 2008 FIZIK Kertas 3

PERATURAN PEMARKAHAN

Kertas soalan ini mengandungi 5 halaman bercetak . MARKING SCHEME PHYSICS PAPER 3 (2008) 4531/3

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No. Answer 1 (a) (i) Incident angle,// i, // sine i (ii) Refracted angle,// r, //sine r (iii) Refractive index (b) i/º r/º Sine i Sine r 15 30 45 60 75

Marks 1 1 1

note: teacher must measure r and culclate sine i and sine r.

Tabulate data 1. Shows a table which have i, r, sine i and sine r 2. State the correct unit for i and r. 3. All values of r are correct 4. Values of sin i are consistent to 3 decimal places. 5. Values of sin r are consistent to 3 decimal places. (c)

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Draw the graph of sin r against sin i 1. The responding variable, sin r at y axis, the manipulated variable, sine i at x axis States the unit of the variable correctly 2. Both axis with the even and uniform scale 3. 5 points correctly plotted 4. A smooth best fit straight line 5. Minimum size of the graph is 10 cm x 8 cm No of ticks √ 7 5,6 3,4 2 1

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Marks 5 4 3 2 1

(d)

Sine r is increase linearly to sine i

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(e)

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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. TOTAL

2 (a) (i) Increase (ii) 1. Show the vertical line from R = 5Ω until touches the

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graph, then horizontal line until it touches the 1/I axis. 2. 1/I = 4.6 3. I = 0.22A (w unit) (b) (i)

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1. Shows the triangle with an acceptable size/ minimum size 8 cm x 8 cm 2. Substitute correctly =(7-0) / (6-1) 3. States the value of gradient and its unit =1.4 V

(ii) Rewrite R = E (1/I) – r corresponding to y = mx + c // gradient / m = E E = 1.4V (iii) 1. Extrapolation of the graf. 2. r = 1.4Ω (c) 1. Do not let the circuit close for a long time to prevent from increasing the temperature/resistance 2. All the wire must be connect tightly to prevent current lost 3. Use new battery to ensure maximum emf TOTAL

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SECTION B NO ANSWER Marks 3(a) Inference : 1 The volume of the gas depends on the temperature which acts on it. (b) Hypothesis: The larger the temperature, the larger is the volume of a fixed mass of gas. / 1 The volume of a gas varies directly with its temperature. (c)(i Aim : To investigate the relationship between the temperature and volume ) for a fixed mass of gas at a constant pressure. 1 (ii) Variables : Manipulated : Gas temperature, T Responding : Gas volume, V 1 Fixed : Gas pressure,P or mass of gas, m 1 (iii) Apparatus : beaker, stirrer, heater, capillary tube, natrium hydroxide (con), 1 thermometer, metre rule, water, (iv) Arrangement of apparatus: 1

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4 thermometer heater

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Capillary tube stirrer Natrium hydroxide

power supply

(v)

ℓ@V

Procedure: 1. The apparatus is set up as shown in the diagram above. 2. Switch on the power supply so that the heater will heat the water. 3. Read thermometer when the temperature reach 30°C. 4. At the same time measure the length, ℓ of air trapped inside the capillary tube. (The volume of air is comply to the length of the air trapped) 5. Stir the water continuously, and repeat the experiment when the temperature reach 40°C, 50°C, 60°C and 70 °C.

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(vi) Temperature,T / °C

Temperature,T / K

Volume, V / cm3

30 40 50 60 70 (vii)

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V / cm3 1

T/K Volume of a fixed mass of gas is directly proportional to its temperature. TOTAL 4(a) (b) (c)(i ) (ii)

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Inference : Period depend to the mass Hypothesis: The increase of mass, the increase of period Aim : To investigate the relationship between period and mass

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Variables : Manipulated : mass Responding : period

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5 Fixed : original length,spring constant

(iii) (iv)

Apparatus : Spring, slotted weight,stop watch, retort stand, Arrangement of apparatus:

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1 (v)

(vi)

Procedure: 1. The apparatus is set up as shown in the diagram above. 2. A 50 g slotted weight is attached to the lower end 3. The spring is then set to vibrate vertically and the time for 10 complete vibrations is measure by stop watch 4. Experiment is repeted with mass 100g,150g,200g and 250 g Mass/g 50 100 150 200 250

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Period /s

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T/s (vii) 1 m/g TOTAL

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