skema-paper2 ptghn
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JABATAN PELAJARAN NEGERI PERAK
PEPERIKSAAN PERTENGAHAN TAHUN SAINS
PMR 2011
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MARKING SCHEME
Science – Paper 2
Q Answer Marks
1(a)
(b)(i)
(b)(ii)
SmokeAsap
SolidPepejal
Cooking OilMinyak masak
LiquidCecair
StoneBatu
GasGas
Total
(1 mark each)
3 marks
(1 mark each)
2 marks
1 mark
6 marks
2(a)(i)
(a)(ii)
(b)
Slow
Because it has less difference in pressure
Make another hole // open the lid
1 mark
1 mark
1 mark
1
Solid GasLiquid
Move freelyBergerak dengan bebas
√ Vibrate about a fixed positionBergetar pada tempatnya
(c)
(d) Volume // Altitude Total
2 marks
1 mark6 marks
3(a)
(b)(i)
(b)(ii)
(c)
(d)
Potential energy
S
S is the nearest to the centre of gravity // It is the lowest point
Kinetic energy
Total
1 mark
1 mark
1 mark
1 mark
2 marks
6 marks
4(a)(i)(ii)
(b)
(c)
R, S // left atrium, left ventricleLeft ventricleReason: need to pump blood to all parts of the body // Has to exert higher blood pressureOxygenated blood is bright red whereas deoxygenated blood is dark red in colour. //Oxygenated blood contains higher concentration of oxygen whereas deoxygenated blood contains higher concentration of oxygen. //Oxygenated blood contains lower concentration of carbon dioxide whereas deoxygenated blood contains lower concentration of carbon dioxide.
A
Total
2 mark1 mark1 mark
1 mark
1 mark
6 marks
2
Kinetic (energy)
Heat (energy)
√
√
Rice cooker
Rubber sucker
Syphon
Electric kettle
5(a)(i)(a)(ii)(a)(iii)(a)(iv)(b)(i)(b)(ii)(c)(i)
(c)(ii)
Break/ shed downTo prevent infection (of the reproductive organs)Fertilisation // pregnancyContinues to thicken7th June 201123th May 2011Zygote undergoes cell division //Embryo travels along the fallopian tube //Implantation of embryo in the uterusIUCD
Total
1 mark 1 mark1 mark1 mark1 mark1 mark1 mark
1 mark
6 marks
6(a)(i)(a)(ii)
(b)(c)(i)(c)(ii)
(c)(iii)(d)(e)
HydrogenBurning wooden splinter extinguished and a ‘pop’ sound is producedCombustion / respiration / burningCompoundIt contain two or more element which are chemically combined //can only be separated chemicallyCarbon dioxide (any relevant answer)To increase rate of conductivity of waterEvaporation
Total
1 mark1 mark1 mark1 mark1 mark
1 mark1 mark1 mark8 marks
7(a)(i)
(a)(ii)
(b)
(c)(d)
Brick red precipitate is formed in Diagram 7.1(a) when tested with Benedict solution //Blue colour remain the same in Diagram 7.1(a) when tested with Benedict solution Brick red precipitate is formed because glucose is present
Manipulated Variable Presence of glucose // absence of glucose
Responding Variable The change of colour in Benedict / Iodine
If glucose is present, brick red precipitate will be formedTurns to dark blue
Total
1 mark
1 mark
2 mark
1 mark1 marks
3 marks
9 marks
3
Supply energy Growth
Bread, mee Fish
8(a)(i)
(ii)(iii)
(b)
(c)
(d)(i)(ii)
(e)
(f)
Water in B is hotter than in A // Water in A is cooler than in BIf container A is used, water will become less hot // vice versaWater in B is hotter because B prevents more heat loss /B releases less heat15, 30, 45, 60
Note: 3 correct – 2 marks 2 correct – 1 mark
0-1 correct – 0 mark
Note: All points correct – 1 markWidth of the bar – 1 mark
Types of rodTime taken // conductivity of heat
Different types of rod has different time taken for thumbtacks to drop
A good heat conductor is reading of stopwatch
Total
1 mark
1 mark1 mark
2 mark
2 marks
1 mark1 mark
1 mark
1 mark
11 marks
4
Glass Iron Copper Aluminium