Marking Scheme Paper 3 Melaka 09

8/12/2019 Marking Scheme Paper 3 Melaka 09

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50 31 0.77 0.52

60 37 0.87 0.60

(c) Draw a complete graph of sin r against sin i.

1. Show sin r on the vertical axis and sin i on the

horizontal axis

2. state the unit for sin i and sin r correctly

3. Both axes are marked with uniform scale

4. All five points are plotted correctly

Note: Only three points plotted correctly, award √

5. Best fit line is drawn.6. Show the minimum size of graph at least 5 x 4 (2

cm x 2 cm) squares

7 ticks 5 marks 5-6 ticks 4 marks 3-4 ticks 3

marks

2 ticks 2 marks 1 tick 1 mark

5

(d) State the correct relationship between sin r and sin

i.

Sin r is directly proportional to sin i 1

Total 16

2 (a)(i) The potential difference decreases linearly with I. 1

(ii)

1. Extrapolation of the graph.

2. V = 3.5V

1

1

(iii)

Electromotive force 1

(b) 1. Shows the triangle with an acceptable/

minimum size 8 cm x 8 cm

1



2. 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

(c) 1. Show the vertical line from I= 0.60A until

touches the graph then horizontal line until it

touches the V-axis.

2. V = 2.5V

1

1

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

3.5 = 0.60(R + 1.67)2. R = 4.16 Ω11

(e) The position of the eyes must be perpendicular to

the scale of the ammeter or voltmeter/

Repeat the experiment and take average /

Switch of the circuit when not taking any reading

1

TOTAL 12

3(a) Inference :

The size of the gas bubble depends on the depth of

the water.

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: must label

1

(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 observedand 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 cm

3and 60 cm

3.

1

1

1

(vi)

Volume V / cm3

V

1/ cm

-3 Pressure P /

Nm-2

100

90

80

70

1



(iv)

1

(v) Procedure: The switch is closed and the power

supply is switched on . The rheostat is adjusted to

obtain the current, I = 0.5 A.

The no of pins attracted to soft iron rod is counted.

The values of current I is repeated with I =

1.0A,1.5A, 2.0A and 2.5A

1

1

1

(vi)

tabulate data :

Current,I No of pins

attracted

1

(vii) analyse data 1



no of pins attracted

current

TOTAL 12

END OF MARKING SCHEME

Marking Scheme Paper 3 Melaka 09

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