Pentaksiran Diagnostik Akademik (Fizik Kertas 3)

PENTAKSIRAN DIAGNOSTIK AKADEMIK (FIZIK KERTAS 3)

SBP 2017

Marking Scheme Paper 3 (4531/3)

Question Answer Mark Total Mark (a)(i) Manipulated variable = Temperature // θ 1 1

(ii) Responding variable = Length of air column // x 1 Constant variable = Cross sectional area of capillary tube// Mass (iii) of air 1 // atmospheric pressure (b) (i) To produce dry air 1

x = 2.0, 3.7, 5.2, 6.7, 8.3, 10.0 2 (ii) All correct: 2 marks At least 4 correct: 1 mark

(iii) θ / 0C x / cm 0 2.0 20 3.7 40 5.2 60 6.7 80 8.3 100 10.0 3

1 mark – 3 columns for θ and x 1 mark – correct units for each θ and x 1 mark – all values of θ are consistent 1 d.p (c) Draw the graph of θ against x. A - Label y-axis and x-axis correctly  B - States the unit at the axis correctly  C - Both axes with the even and uniform scale  D - 6 points correctly plotted:   - at least 3 points correctly plotted  5 E - a smooth best straight line  F - minimum size of the graph is 5 x 4 squares of 2 cm x 2 cm.  7  - 5 marks 6-5  - 4 marks 3-4  - 3 marks 2  - 2 marks 1  - 1 marks (d) x is linearly increase to θ 1 Question Answer Mark Total Mark (e) The position of the eye must be perpendicular to the scale reading of ruler/thermometer// 1 Repeat the experiment to get the average value Total 16

Question Answer Mark Total Mark 2 (a)(i) R is directly proportional to L 1 1 Extrapolate the graph 1 (ii) Show on the graph when R= 2.75 Ω, 1 3 L = 75 cm 1 The gradient of graph R against L Draw a big triangle (5 X 4 blocks) 1 q = 2.5 – 0.0 Ω 1 70.0 – 0.0 cm (iii) 3 1 = 0.0357 Ω cm-1 (answ er and corre ct unit) Use R/L = 0.0357 Ω cm-1 1

(b)(i) 3 1 = 0.79 (0.046)2 (0.0357) 1 = 0.0000597 Ω cm (ii) Decreases 1 1 (c) The position of the eye is perpendicular to the scale of metre rule. 1 1

Total 16 Question Answer Mark Total Mark 3 State a suitable inference 1 1 (a) The extension of spring depends on force State a relevant hypothesis 1 1 (b) The greater the force, the greater the extension of the spring State the aim of experiment 1 1 (c)(i) To investigate the relationship between the force and the extension of the spring State the manipulated variable and the responding variable 1 1 Manipulated : force (ii) Responding : extension of spring State ONE variable that kept constant 1 1 Diameter of spring, diameter of coil, spring constant Complete list of apparatus and materials 1 1 (iii) Spring, slotted weight, pin, retort stand, metre rule Arrangement of apparatus : 1 1

(v) State the method of controlling the manipulated variable 1. Initial length of spring, l0 is measured and recorded. 1 3 2. A slotted weight of mass, m = 50 g is added at the end of the spring.

State the method of measuring the responding variable 3. The new length of the spring, l is measured and extension, x is 1 calculated by using formula x = l – l0

Repeat the experiment at least 4 times 4. The experiment is repeated by using mass of = 100 g, 150 g, 200 g 1 and 250 g Question Answer Mark Total Mark Tabulation of data: 1 1 m/g x/cm

Analyze the data. 1 1 x/cm (vii) m/g

Total marks 12 12

Question Answer Mark Total Mark 4 (a) State a suitable inference 1 1 Angle of reflection depends on the angle of incidence

(b) State a relevant hypothesis 1 1 Angle of reflection increases as the angle of incidence increases

(c) (i) State the aim of experiment 1 1 To investigate the relationship between angle of reflection and the angle of incidence

(ii) State the manipulated variable and the responding variable Manipulated variable: angle of incidence 1 3 Responding variable : angle of reflection 1

State ONE variable that kept constant Fixed variable : Angle between plane and mirror // focal length(sila 1 rujuk*) .

(iii) Complete list of apparatus and materials 1 1 plane mirror, ray box, meter rule, white paper, protractor

(iv) Arrangement of apparatus : 1 1 Question Answer Mark Total Mark

(v) State the method of controlling the manipulated variable 1. The set-up of the apparatus is as shown in figure above. 2. Start the experiment with angle of incidence, i = 20o . A ray of light 1 from the ray box is directed to the plane mirror.

State the method of measuring the responding variable 3. Record the angle of reflection, r which is measured by using a protractor. 1 3

Repeat the experiment at least 4 times 1 4. Repeat the experiment by using i = 30o, 40o, 50o, and 60o.

(vi) Angle of incidence, i 20o 1 1 30o 40o, 50o, 60o. Question Answer Mark Total Mark

(viii)

TOTAL 12

*catatan