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FIZIK KERTAS 3

Answer Scheme Final Exam 2010 FORM 4 PHYSICS (Paper 3) Section A Question Answer 1(a) (i) Object distance, u (ii) Image distance, v (iii) Focal length , f // thickness of convex lens (b) Marks 1 1 1

Tabulate data 1. Shows a table contain 4 quantities : u , v, 2. State the correct unit for u , v, 1 1 and u v m1 m2 m3 m4, m5 m6, m7

1 1 and u v 3. All values of v are correct and consistent to 1 decimal places. 1 4. Values of are consistent to 3 decimal places. u 1 5. Values of are consistent to 3 decimal places. v 1 1 against u v 1 1 1. The responding variable, at y axis, the manipulated variable, at v u x axis 2. States the unit of the variable correctly 3. Both axis with the even and uniform scale 4. 4 -1 points correctly plotted All of 5 points correctly plotted. 5. A smooth best fit straight line 6. Minimum size of the graph is 10 cm x 8 cm Draw the graph of(c)

1 2 3 4, 5 6 7

1

(d)

1 1 is decreases linearly to u v * If the graph that has been plotted does not cross axis-y, cancel any answer in (d).Total

1

16 M 1 1 1 1 1 1 1 1 1 1 1 1

2 (a)(i)

(ii) (iii)

b(i)

(ii)

1) Draw the extrapolation line from t = 1 min to the y-axis 2) State the correct value of with correct unit 28.5C 0.5 C 1) State the correct relationship of and t increases linearly with t 1) Construct a sufficiently large triangle (4x4) 2) Make the correct substitution 69-37 5-1 3) State the correct value with unit 8.0C min-1 1) Make correct substitution E=P x t = 200 x 5 x 60 2) State correct answer with unit 60 000 J 1) Make the correct substitution C = 60 P = 60 x 200 mM 8 x 0.4 2) State the correct answer 3750 3) State the correct unit J kg-1C-1 1)State one suitable precaution -Eye perpendicular to scale of thermometer to avoid parallax error -Repeat experiment 4 times and calculate average -Stir cooking oil before taking thermometer reading to get uniform temperature Total

(c)

12 M

2

Section B 3 (a) (b) (c)(i) (ii) The length of the spring depends on the mass of the babies The bigger the mass of the attached weight, the longer the length of the spring. To study the relationship between the mass attached and the length of a spring Manipulated variable : mass of weight, m Responding variable : length of spring, l // extension of spring, e Fixed variable : diameter of spring // spring constant List of apparatus/material: slotted masses, retort stand, metre rule, pin and spring. Arrangement of apparatus (iv) 1 1 1 1

1 1 1

(iii)

(v)

Method of controlling the manipulated variable I. A slotted mass of 100 g is hooked at the lower end of the spring Method of measuring the responding variable II. The length of the spring, l is measured by using metre rule Repeated experiment III. Experiment is repeated with slotted weights of mass m = 200 g ,300 g ,400 g and 500 g

1 1

1

3

(vi)

Mass, m / g 100 200 300 400 500 A graph of l against m is drawn l /cm

length of spring, l / cm

1

(vii)

1

m/ gTOTAL 4 (a) (b) (c)(i) (ii) The volume of the balloon depends on the pressure The volume of a gas increases as the pressure decreases To investigate the relationship between pressure and volume of gas at constant temperature Manipulated variable : Volume of gas, V Responding variable : Pressure of gas, P Fixed variable : Temperature of gas // mass of gas List of apparatus/material: Syringe, Bourdon gauge, rubber tube Arrangement of apparatus (iv) 1 12 1 1 1

1 1 1

(iii)

4

(v)

Method of controlling the manipulated variable I. The piston of the syringe is adjusted until the volume, V= 100cm3 Method of measuring the responding variable II. The pressure, P on the Bourdon gauge is recorded Repeated experiment III. The steps are repeated by reducing volume, V = 90 cm3, 80 cm3, 70

1 1 1

(vi)

cm3 and 60 cm3 Volume, V /cm3 100 90 80 70 60 Pressure, P / Pa 1

(vii)

A graph of P against V is drawn Pressure, P / Pa 1

Volume, V / cm3 TOTAL 12M

5