skema p3.docx

7/27/2019 SKEMA P3.docx

http://slidepdf.com/reader/full/skema-p3docx 1/6

SKEMA PEMARKAHAN FIZIK

PEPERIKSAAN PERCUBAAN SPM 2012

KERTAS 3

Section A

No.1 Answer Mark

a(i) State the manipulated variable correctly

Current, I / Arus, I 1

(ii) State the responding variable correctly ;

Voltage, V / Voltan, V 1

(iii) State one fixed variable;

Internal resistance, r / Rintangan dalam, r ,

The number of dry cell / Bilangan sel kering 1

bTabulate h, s and v correctly in the table.

√ Shows a table which have I, V and E

√ State the correct unit of I (A), V(V) and E (V)

√√ Values of V are correct.

√√ Values of E are correct.

√ All the values are consistent in 1 d.p or 2 d.p.

I (A) V(V) E (V)

0.2 1.3 1.40

0.3 1.1 1.25

0.4 0.9 1.10

0.5 0.7 0.95

0.6 0.5 0.807

c

Draw the graph of v against h.

√ - Label y-axis and x-axis correctly

√ - States the unit at both axis correctly

√ - Both axes with the even and uniform scale

√ - 5 points correctly plotted

√- a smooth best straight line

√- minimum size of the graph is 5 x 4(Squares of 2 x 2 cm)

Number

of √

Score

6 5

5 4

3-4 3

2 2

1 1

5

d State the correct relationship based on the candidate’s graph E decrease linearly to I

1



2 a) F is directly proportional to x. (1m)

b) i) - Show the vertical line corresponding to x at point 4.0.(1m)

- Identify the value of F = 17.5N (1m)

b) ii) - Draw a sufficiently large triangle minimum (8 x 8) cm(1m)

- Correct substitution (Follow candidate’s triangle)(1m)

- Correct answer and no unit(1m)

4.42 - 4.44 (until 3 d.p.)

b) iii) k = gradient

k = 4.444 with correct unit (2m)

v) - Correct substitution (1m)

F = 4.444 x 5

- Correct answer with correct unit(1m)

F = 22.22N

c) State two precautions correctly.

1. Position of eyes is directly perpendicular to the scale of metre ruler. (1m)

2. Repeat the experiment and calculate the average. (1m)



NO MARKING CRITERIAMARK

SUB TOTAL

3 (a) State a suitable inference

The pressure (due to liquid) depends on its depth 1 1

(b) State a relevant hypothesis

The pressure of liquid increases as its depth increases 1 1

(c) Describe a complete and suitable experimental

framework

(i) State the aim of experiment

To investigate the relationship between depth and pressure in

a liquid 1

(ii) State the manipulated variable and the responding

variable

Manipulated variable : Depth of water

Responding variable : Water pressureState the constant variable

Constant variable : Density of water // Volume of water

1

1

1

(iii) List out the important apparatus and materials

Thistle funnel, manometer, balloon skin, rubber tube, tall

cylinder, rubber band, retort stand and clamp, metre rule,

water and colour liquid

1

(iv) Draw or describe a functionable arrangement of the

apparatus

1

(v) State the method of controlling the manipulated variable

The tall cylinder is filled with water till about ¾ full. 1



The funnel with the membrane facing downwards is

pushed into the cylinder to a depth, d of 5 cm.

(vi) State the method of measuring the responding variable

The corresponding difference in coloured liquid level, h

of the manometer is measured with a metre rule and itsreading is recorded.

1

(vii) State how the procedure is repeated to obtain at least 5

sets of results

Repeat the experiment with d = 10.0 cm, 15.0 cm, 20.0 cm

and 25.0 cm.

1

(viii) Tabulate the data

Depth, d (cm) Difference in coloured

liquid level, h (cm)

5.0

10.0

15.0

20.0

25.0 1

(ix) State how data will be analysed

The graph of h against d is drawn

1 10

12



NO MARKING CRITERIAMARK

SUB TOTAL

4 (a) State a suitable inference

The electric current affects the loudness of the bell //

The loudness of the bell depends on the electric current. 1 1

(b) State a relevant hypothesis

The strength of an electromagnet increases as the current

increases. 1 1

(c) Describe a complete and suitable experimental

framework

(i) State the aim of experiment

To investigate the relationship between electric current and

the strength of an electromagnet. 1

(ii) State the manipulated variable and the responding

variableManipulated variable : electric current // number of battery

Responding variable : strength of an electromagnet

State the constant variable

Constant variable : number of turns // type of core

1

1

1

(iii) List out the important apparatus and materials

Ammeter, rheostat, insulated wire, connection wires, retort

stand, switch, d.c. supply, soft iron core, solenoid, small iron

nails and plastic container. 1

(iv) Draw or describe a functionable arrangement of theapparatus

1

(v) State the method of controlling the manipulated variable

The switch is closed.

Record the ammeter reading = 0.1 A.

The end of the solenoid is dipped into the plastic

container full of small iron nails.

1



(vi) State the method of measuring the responding variable

The plastic container is removed and the number of nails

attached to the electromagnet is counted = N.

1

(vii) State how the procedure is repeated to obtain at least 5

sets of resultsRepeat the experiment with different value of current by

adjusting the rheostat, I = 0.2 A, 0.3 A, 0.4 A and 0.5 A. 1

(viii) Tabulate the data

Current, I / A Number of small iron

nails, N

0.1

0.2

0.3

0.4

0.5 1

(ix) State how data will be analysed

The graph of N against I is drawn.

1 10

12

skema p3.docx

Documents