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# 2015 PSPM Kedah Fizik3 w Ans

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2015 Percubaan SPM Kedah Fizik

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MODUL PENINGKATAN PRESTASI TINGKATAN 5

TAHUN 2015

MAJLIS PENGETUA SEKOLAH MALAYSIA (KEDAH)

MODUL 2

FIZIK

Kertas 3

Peraturan Pemarkahan

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BAHAGIAN A

Soalan Cadangan Jawapan Markah 1(a) (i) Mass // m 1

(ii) Angle of deflection // θ 1 (iii) Mass of rod // Length of rod 1

(b) (i) β : 55o, 44o, 36o, 30o 1 (ii) θ : 35o, 46o, 54o, 60o [4 correct: 2 marks; 3 correct: 1 mark] 2 (iii) tan θ : 0.700, 1.036, 1.376, 1.732 1 (iv) Table with 4 columns m, β, θ, tan θ with correct unit for m

Consistent number of d.p. for m and tan θ

m / g β θ tan θ 5.0 71 o 19 o 0.344 10.0 55 o 35 o 0.700 15.0 44 o 46 o 1.036 20.0 36 o 54 o 1.376 25.0 30 o 60 o 1.732

1 1

(c) tan θ at the y-axis, m at the x-axis � Correct unit for m � Suitable scale for both axes � 5 points plotted correctly �� [4 points correct: �] Best straight line � Size of graph � 7� : 5 marks 5-6� : 4 marks 3-4� : 3 marks 2� : 2 marks 1� : 1 mark

5

(d) tan θ is directly proportional to m 1 (e) The eye must be perpendicular with the scale of the protractor 1

16 2(a) (i) v decreases linearly with t 1

(ii) Show extrapolation to v = 0 t = 13.6 s Acceptable range of t = 13.4 to 13.8

1 1

(iii) A sufficiently large triangle drawn Correct substitution based on candidate’s triangle Correct answer with unit, h = –2.5 m s–2

1 1 1

(b) (i) A = ( )8 1434

2

1 + // ( )1482082

1 ×+

××

A = 192 m

1 1

(ii) ( )

×−+=2

85.2272

2

s

s = 192 m

1 1

(c) Gradient increases 1 (d) Repeat the experiment and calculate the average value 1

12

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BAHAGIAN B

Soalan Cadangan Jawapan Markah 3(a) The temperature of a gas affects its volume //

The volume of a gas depends on its temperature 1

(b) The higher the temperature of a gas, the bigger the volume of the gas 1 (c) (i) To investigate the relationship between the temperature of a gas and its volume 1

(ii) Manipulated variable : temperature Responding variable : volume // length of air column Constant variable : mass // pressure

1 1

(iii) Glass tube, ruler, beaker, thermometer, tripod stand, wire gauze, bunsen burner, water, ice, sulphuric acid

1

(iv) Labelled diagram showing set up of apparatus that will function

1

(v) 1. The water is heated slowly until it reaches a temperature of θ = 20 oC 2. The length of the air column, L, is taken and recorded. 3. Steps 1 and 2 are repeated for temperatures of 30 oC, 40 oC, 50 oC, 60 oC

1 1 1

(vi) θ / oC L / cm

20 30 40 50 60

1

(vii) A graph of L against θ is drawn. 1 12

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4(a) The number of turns of wire in the secondary coil affects the output voltage 1 (b) The greater the number of turns of wire in the secondary coil, the greater the

output voltage 1

(c) (i) To investigate the relationship between number of turns of wire in the secondary coil and the output voltage

1

(ii) MV : number of turns of wire in secondary coil, N RV : output voltage, V CV : number of turns of wire in the primary coil

1 1

(iii) 12 V AC power supply, C-shaped soft iron cores, clip, 900 turn primary coil, secondary coils of 100, 200, 300, 400 and 500 turns, AC voltmeter, connecting wires

1

(iv) Labelled diagram showing set up of apparatus that will function

1

(v) 1. Use 900-turns copper coil as the primary coil and 100 turns of secondary coil of a transformer.

2. The switch is turned on and the output voltage is measured by using a voltmeter.

3. Steps 1 and 2 are repeated by using copper coil with 200 turns, 300 turns, 400 turns and 500 turns as the secondary coil and same number of primary coil.

1 1 1

(vi) Number of turns of wire in

secondary coil, N Output voltage, V / V

100 200 300 400 500

1

(vii) A graph of V against N is drawn 1 12

V

Soft iron core Secondary coil Primary coil

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