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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
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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)
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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
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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
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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
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(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
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