2010 ppmr kedah sc2 w ans
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SCIENCE
PMR
Ogos 2010
PEPERIKSAAN PERCUBAAN
PENILAIAN MENENGAH RENDAH 2010
SCIENCE
KERTAS 2
PERATURAN PEMARKAHAN
UNTUK KEGUNAAN PEMERIKSA SAHAJA
Peraturan pemarkahan ini mengandungi 14 halaman bercetak
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2
No. Marking Scheme
Marks
Total
Mark
1(a)
(b)
Able to label parts P, Q, and R correctly
Answer
P : Prominence
Q : Sunspot
R : Solar flares
Able to match the phenomenon correctly.
Answer
Neutron star
Bintang neutronBlack hole
Lohong hitamWhite dwarf
Kerdil putih
Y Z X
1
1
1
1
1
1
3
3
Total 6
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3
No. Marking Scheme
Marks
Total
Marks
2
( a )
( i )
( ii )
1
2
( b )
( i )
( ii )
Able to state the method.
Answer
Water displacement
Able to determine the volume of stone
Answer
27 ml/cm3 unit must be written
[ without calculation ]
Able to determine the volume of cork
Answer
3 ml/cm3 unit must be written
[ without calculation ]
Able to name apparatus P correctly.
Answer
P external calipers
Able to determine the thickness of boiling tubes wall correctly
Answer
(3.0 cm - 2.5 cm) = 0.25 cm unit cm must be written
1
1
1
1
1
1
2
2
2
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4
No. Marking Scheme
Marks
Total
( c ) Able to choose the suitable apparatus correctly.
Answer
1 1
Total 6
No. Marking Scheme Marks Total
3
( a )
( i )
( ii )
Able to name substance L correctly.
Answer
Metal/iron/copper/ any example of metals.
Able to make conclusion based on their properties.
Answer
Copper/L is metal which conducts electricity while sulphur/K is non metal
which does not conduct electricity.
1
1 2
ThreadBenang
RulerPembaris
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5
No. Mark Scheme M
3
( b )
( i )
(b)
Able to choose the correct sequence correctly
Answer
Note: 4 correct , award 2 marks
3 correct, award 1 mark
2 or 1 correct, award 0 mark2 2
4 3
2
Mixture of sand , iron
filings and saltCampuran pasir, serbuk
besi dan garam
1
Ma net
Salt ,sand and water
Garam , pasir dan air
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6
No. Marking Scheme M
3
( c )
( i )
( ii )
Able to give correct observation.
Answer
Iron filings are attracted to the magnet but sulphur powder is not attracted to
the magnet.
[ accept any suitable answer ]
Able to state the properties correctly
Answer
The product cannot be separated by physical method // The product can be
separated by chemical method.[ accept any suitable answer ]
1
1 2
Total 6
No. Marking Scheme M
4
( a )
(b )
Able to arrange the sequence correctly
Answer
R ,Q, and P
Able to name the solution correctly
Answer
Dilute solution
1
1
1
1
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(c )
(d )
(i)
(ii)
Able to give two factors that affect the rate of dissolving correctly
Answer
1. The volume of solvent/water
2. The temperature of solvent/water
3. Size of solute/sugar
4. Rate of stirring
Able to give the suggestion
Sample Answer
Increase the volume of solvent /(distilled) water into beaker R//add more
water
Add more (distilled) water to beaker R, so the density of solution will be
reduced and the egg will sink.
1+1
1
1
2
1
1
Total 6
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8
No. Mark Scheme M
5
(a)
(i)
(ii)
(b)(i)
(ii)
(iii)
Able to draw the curve correctly
Answer
Able to state the growth pattern
Answer
Infancy: Rapid growth
Adulthood: Minimal growth
Able to make conclusion based on the graph at the age range 13 to 15
Answer
The growth rate of girl is higher than boy.
Able to explain the factor that make the difference growth rate between the
girls and boys
Answer:
A girl reaches puberty earlier than boy.
Able to state the age that the girl reaches height of 140 cm
Answer:
13 years old
1
1+1
1
1
1
1
2
1
1
1
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(c)(i)
(ii)
Able to name the disease
Answer:
Kwashiorkor (spelling must correct)
Able to name the class of food
Answer:
Protein (reject any example of proteins)
1
1
1
1
Total 8
No. Marking Scheme M
6(a)(i)
(ii)
(b)(i)
Able to draw electric circuit.
Sample Answer
R
SAble to state the way ammeter and voltmeter are connected.
Sample Answer
In circuit R, ammeter is connected in series, while in circuit S,
voltmeter is connected in parallel.
Able to state the relationship between V, V1, and V2.Sample Answer
V= V1=V2 // voltage V is equal to V1 and V2.
1 + 1
1
1
2
1
1
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(ii)
(iii)
(c)(i)
(ii)
Able to state the relationship betweenI, I1, andI2.
Sample Answer
I= I1 + I2 // The currentIis equal to the sum ofI1
andI2.
Able to state the relationship betweenR, R1, andR2.
Sample Answer
= +
Able to state the difference in brightness of the bulb P in Circuit 1 and
Circuit 2.
Answer
Bulb P in Circuit 2 is brighter than Circuit 1 // Bulb P in Circuit 1 lessbrighter or dimmer than Circuit 2.
Able to give one reason for the answer in (c)(i).
Answer
Bulb P in Circuit 2 is arranged in parallel so it receives (more current) /
(higher voltage) or
Bulb P in Circuit 1 is arranged in series so it receives (less current) / (less
voltage )
*Note: Bulb P in Circuit 2 is arranged in parallel. Wrong!(accept: Bulb P in circuit 2 receives more current/higher voltage)
1
1
1
1
1
1
1
1
Total 8
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11
No. Marking Scheme M
7
(a)
(b)
Able to state the support system
Answer
J : ThornK : Tendril
L : Thorn
M : Twinning stem
Able to classify
Sample answer
1.
2.
11
1
1
2
2
4
4
with thorn
K, MJ, L
without thorn
J, K, L , M
J, L, M
without tendril
K
With tendril
J, K, L , M
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(c)(i)
(ii)
3
Able to state the condition of aquatic plant
Answer
Plant in situation B stands upright but plant in situation A cannot stand
upright
Able to state the inference
Answer
The plant stands upright because of water buoyancy
1
1
1
1
Total 10
J, K, L , M
M
With twinning
stem
J , K, L
Without
twinning stem
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13
No. Marking Scheme
Marks
Total
8(a)
(b)
(i)
(ii)
(iii)
Able to make inference based on diagram 8.1.
Sample Answer
1 In the presence of light, the water weed carries out photosynthesis.
2 In the presence of light, the water weed releases oxygen.
3 Water weed needs light to carry out photosynthesis.
4 During photosynthesis, oxygen is released.
[Accept any reasonable answer]
Able to record the volume of oxygen.
Answer
Distance = 20 cm ; Volume = 0.4 cm3
Distance = 30 cm ; Volume = 0.2 cm3
Able to draw a line graph
Answer
Note: 3 correct points - 1 mark
Straight line - 1 mark
1
1
1
1+1
1
1
1
2
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(c)
(d)
(e)
(f)
(g)
Able to state the relationship between volume of oxygen and distance of bulb.
Answer
The farther the distance, the lesser the volume // The closer the bulb, the
higher the volume // Indirectly proportional.
Able to state the responding variable;Answer
The rate of photosynthesis // The volume of oxygen
Able to state one constant variable.
Answer
Type of bulb/lamp or Type/size of the plant. or the size of the gas jar.
Able to predict based on the graph drawn.
Answer
0.3 cm3 (the value same as shown in the graph. Not by calculation.)
Able to give definition based on the question. (Not from students
knowledge).Sample Answer
1 The rate of photosynthesis refers to the volume of oxygen released.
2 Amount of oxygen collected.
3 The volume of oxygen collected at different light intensity
(Any reasonable answers)
1
1
1
1
1
1
1
1
1
1
10