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PENILAIAN MENENGAH RENDAH 2009
SET 1 SAINS
KERTAS 2 ( KUMPULAN CEMERLANG)
PERATURAN PEMARKAHAN
UNTUK KEGUNAAN PEMERIKSA SAHAJA
55/2 SCIENCE PMR May 2009
1
MARKING SCHEME Questions Scoring Criteria Marks Total
marks
1 a ( i )
P : Stigma Q : Ovary R : Anther
3 marks
b
c
Seed
Biji benih
Fruit Buah
Shoot Pucuk
3 marks 1 mark
6 marks
2
a
b
J : Compound K : Element L : Mixture J : water // carbon dioxide L : air // petroleum
3 marks 2 marks
P
Q
R
Produces ovules Menghasilkan ovul.
Produces pollen grain Menghasilkan butir debunga.
Enables pollen grains to stick on it. Membolehkan butir debunga melekat di atasnya.
X
2
3
c
a
M : Commensalisms N : Prey – predator O : Mutualism
1 mark
3 marks
6 marks
b
1 mark
c ( i ) ( ii )
d
N // prey – predator Predator kills a pest as a food and it helps to control the population of pest // Predator kills a pest as a food and helps to eliminate the pest in a farm. * accept any suitable answer. Cheaper // Does not pollute the environment . * accept any suitable answer.
1 mark
1 mark
6 marks
4
a The box moves. 1 mark
b ( i )
( ii )
(iii )
Frictional force // Frictional Use a trolley // Fix rollers. Enables us to hold things // Enables us to walk without slipping
1 mark
1 mark
1 mark
√
Organic control Biological control Pesticide control Kawalan organik Kawalan biologi Kawalan racun makhluk perosak
3
c d
Work = 500 N X 10 N
= 5000 Nm
= 5000 J
= 5 kJ
Power = 500 N X 10 N
50 s
= 5000 Nm
50 s
= 100 Nm/s
= 100 J / s
= 100 watt ( W )
2 marks
2 marks
6 marks
5
a ( i )
( ii )
The presence of carbon dioxide gas. Mineral P decompose when its heated and release carbon dioxide gas.
1 mark
1 mark
b Carbon dioxide gas does not react with potassium manganate (VII ) solution .
1 mark
c
Zinc carbonate Zink karbonat
1 mark
d e
Zinc carbonate zinc oxide + carbon dioxide heat The heating of mineral P will form metal oxide and release carbon dioxide.
1 mark
1 mark
8 marks
6 a ( i )
( ii )
Q // R It reduces / lower the voltage from 132 kV to 66kV // It lower the voltage from 66 kV to 11 kV.
1 mark
1 mark
√
4
b
1 mark c
1 mark
d ( i)
(ii)
The outer casing of appliance M is made of a metal which is a good conductor of electric unlike the appliance N. Therefore , to prevent the severe electric shock when the live wire is loose ,M has to use a 3 pin-plug because it has earth wire where the excess electric current can be flow directly to the earth.
2 marks
8 marks
e ( i)
( ii )
= 2640 W 240V = 11 A 13 A
1 mark 1 mark
7 ( a )
J : Brick.- red precipitate is formed. K : Transculent spot is formed. L : Brick.- red precipitate is formed. M : Dark blue is formed.
1 mark 1 mark 1 mark 1 mark
Main fuse Fius utama
Electric meter
Main switch
Circuit breaker
5
4 marks c
(i)
(ii)
Dark blue is formed because ricew contains starch. Dark blue will formed when potato is tested with iodine solution.
1 mark
1 mark
10 marks
8
a
( i)
( ii )
Block Q is more stable than block P. Block Q is more stable because it has a lower centre of gravity. // The lower centre of gravity of block Q make it more stable.
1 mark
1 mark
c (i)
Object K : 12 s Objek L : 7 s Objek M : 4 s * If 3 correct = 2 marks If 2 correct = 1 mark If 1 correct = 0 mark
2 marks
d * On page 6
2 marks
e
The higher the height of an object , the less stable the stability of the object.
1 mark
f The height of an object. 1 mark
g Less than 4 s 1mark
h The most stable the stability of the object needed the greater force to topple it. // An object which is most stable needed the greater force to make it topple.
1 mark 10 marks
J,K,L,M,
Brick – red precipitate is formed.
Brick – red precipitate is not formed.
J , L K , M
6
d.
[ 2 marks ]
Time taken for the model to topple (s )
Model K L M Model
2
4
6
8
10
12
7