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55/2 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

2

No. Marking Scheme Sub 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 neutron

Black hole Lohong hitam

White dwarf Kerdil putih

Y

Z

X

1 1 1

1

1

1

3

3

Total

6

3

No. Marking Scheme Sub 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 tube’s 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

4

No. Marking Scheme Sub

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

√ Thread Benang

Ruler Pembaris

5

No. Mark Scheme Marks Total

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 mark

2

2

4 3

2

Mixture of sand , iron filings and salt Campuran pasir, serbuk besi dan garam

1

Magnet

Salt ,sand and water Garam , pasir dan air

6

No. Marking Scheme Marks Total 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 Marks Total 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

7

(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

8

No. Mark Scheme Marks Total 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

9

(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 Marks Total

6(a)(i)

(ii)

(b)(i)

Able to draw electric circuit . Sample Answer

                              R  

                                  S   Able 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

10

(ii)

(iii)

(c)(i)

(ii)

Able to state the relationship between I, I1, and I2. Sample Answer I= I1 + I2 // The current I is equal to the sum of I1 and I2. Able to state the relationship between R, R1, and R2. 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 less brighter 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

11

No. Marking Scheme Marks Total 7

(a)

(b)

Able to state the support system Answer J : Thorn K : Tendril L : Thorn M : Twinning stem Able to classify Sample answer 1. 2.

1 1 1 1

2

2

4

4

with thorn

K, M

J, L

without thorn

J, K, L , M

J, L, M

without tendril

K

With tendril

J, K, L , M

12

(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

13

No. Marking Scheme Sub 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

14

(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

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