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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