Spm Percubaan 2008 Kedah Physcis Paper 2

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SMS MUZAFFAR SYAH , MELAKA

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SMS MUZAFFAR SYAH , MELAKA

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SMS MUZAFFAR SYAH , MELAKA

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SMS MUZAFFAR SYAH , MELAKA

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SMS MUZAFFAR SYAH , MELAKA

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SMS MUZAFFAR SYAH , MELAKA

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SMS MUZAFFAR SYAH , MELAKA

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SMS MUZAFFAR SYAH , MELAKA

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SMS MUZAFFAR SYAH , MELAKA

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SMS MUZAFFAR SYAH , MELAKA

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SMS MUZAFFAR SYAH , MELAKA

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SMS MUZAFFAR SYAH , MELAKA

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SMS MUZAFFAR SYAH , MELAKA

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SMS MUZAFFAR SYAH , MELAKA

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SMS MUZAFFAR SYAH , MELAKA

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SMS MUZAFFAR SYAH , MELAKA

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SMS MUZAFFAR SYAH , MELAKA

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SMS MUZAFFAR SYAH , MELAKA

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SMS MUZAFFAR SYAH , MELAKA

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SMS MUZAFFAR SYAH , MELAKA

MOZ@C

SMS MUZAFFAR SYAH , MELAKA

MOZ@C

SMS MUZAFFAR SYAH , MELAKA

MOZ@C 4531

SULIT 4531 Physics September 2008

PERSIDANGAN KEBANGSAAN PENGETUA-PENGETUA SEKOLAH MENENGAH NEGERI KEDAH DARUL AMAN

PEPERIKSAAN PERCUBAAN SPM 2008

PHYSICS PERATURAN PEMARKAHAN

Peraturan pemarkahan ini mengandungi

halaman bercetak

4531

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MOZ@C 3 PHYSICS Paper 2 SECTION A NO. 1 (a)

(b) (i)

(ii)

(c)

2(a)

(i)

(ii)

(b)

3(a)

(i)

(ii)

(iii)

(c)

MARK SUB TOTAL

State the sensitivity of the metre rule correctly - 0.1 cm

1

State the diameter of five ball bearings correctly - 3.0 cm

1

State the diameter of one ball bearing correctly - 0.6 cm

1

State the instrument correctly - Vernier callipers

1

State the meaning of acceleration correctly - Rate of change of velocity

1

Mark the point correctly - X at the point (5, 30)

1

Show the substitution correctly 1 (10 + 30) 2 2 Answer with correct unit 40 m

(c)

(b)

MARKING CRITERIA

1

1

Sketch the graph correctly - Curve of the same shape but higher gradient

1

State the principle correctly - Pascal’s principle

1

Answer with correct unit 2.5 N cm-2 // 2.5 x 104 N m-2

1

Compare the pressure correctly - same pressure

1

Show the substitution correctly 2.5 x 5 Answer with correct unit 12.5 N State the reason correctly - Liquid cannot be compressed easily

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4

5

1 1

1

6

MOZ@C 4 NO. 4(a)

(b)

(i)

(ii)

(c)

(i)

(ii)

(iii)

5(a)

(i)

(ii)

(b)

(i)

(ii)

(iii)

(c)

(d)

(e)

MARKING CRITERIA

MARK SUB TOTAL

Name the principle correctly - Thermionic emission

1

Describe the motion correctly - Uniform acceleration

1

Describe the motion correctly - Uniform velocity

1

State the correct answer - Alternating current

1

Calculate the period correctly T = 3 x 0.02 = 0.06 s State the frequency and unit correctly 1 1 f= = = 16.7 Hz T 0.06

1

1

Sketch the waveform correctly - Sinusoidal with one complete cycle

1

Name the force correctly - Gravitational force / Gravity / Weight

1

Name the type of motion correctly - Free fall

1

Compare the force on the coconuts correctly - In Diagram 5.1, the force is higher/greater // vice versa

1

Compare the change in momentum correctly - The change in momentum is the same for both diagrams.

1

Compare the time of impact between the coconuts and their landing ground correctly - In Diagram 5.1, the time of impact is shorter // vice versa

1

Relate the force and the time of impact correctly - The shorter the time of impact, the greater the force

1

Name the force correctly Impulsive force

1

State the field event correctly - High jump / Long jump / Triple jump

1

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7

8

MOZ@C 5 NO. 6(a)

MARKING CRITERIA

MARK SUB TOTAL

(i) State the happening of the wave correctly

Wave diffracts / spreads to a bigger area

1

(ii) State the change to the amplitude of the wave and the reason correctly

-Amplitude of the waves decrease -Energy decreases (iii) State the phenomenon correctly Diffraction (iv) State the change to the speed of the wave correctly Unchanged / same (b)

(c)

7(a)

(b)

(c)

(i) State the correct situation at P Vibrates/Oscillates (ii) State the correct situation at Q Stationary Name the phenomenon correctly reflection

1 1 1 1

1 1

1

(i) State the meaning of heat correctly - The energy transferred from a hot object to a cold object // the energy transfer because of the difference in temperature (ii) Explain how the heat is removed correctly - The temperature of the forehead is higher than the temperature of the pad

1

- Heat is transferred from the forehead to the pad

1

Show the temperature change correctly 36 – 15

1

Show the correct substitution Q = 30 × 4.3 × (36 – 15)

1

Answer with correct unit 2709 J

1

Give suggestion 1 correctly - Increase the mass of the gel

1

Give reason 1 correctly - The heat removed increases with the mass of the gel // the heat removed is directly proportional to the mass

1

Give suggestion 2 correctly - Use a gel with higher specific heat capacity

1

Give reason 2 correctly - The heat removed increases with the specific heat capacity of the gel // the heat removed is directly proportional to the specific heat capacity of the gel

1

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8

1

10

MOZ@C 6 NO. 8(a)

(b)

(i)

(ii)

(iii)

(c) (i)

(ii)

(iii)

MARKING CRITERIA

MARK SUB TOTAL

State the law correctly - current flowing through a conductor is directly proportional to the potential difference across its ends (provided that its temperature and the other physical conditions remain constant)

1

State that the Ohm’s law is not obeyed - Ohm’s law is not obeyed

1

State the reason correctly - The resistance of the conductor is extremely high

1

Show the method to obtained the current - From the graph, when V = 2.0 V, I = 4.6 x10-3 A Correct answers with unit V R= I 2.0 = 4.6 x 10-3 = 434.8 Ω Match the answers correctly - X with K - Y with M - Z with L

1

1

1 1 1

Give the reasons correctly - Gradient of the graph represents the effective resistance of the circuit - Series circuit has higher resistance // Parallel circuit has lower resistance

1

Show the method correctly 12 R = Gradient of graph P = 4 Answer with correct unit = 3Ω

1

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1

1

12

MOZ@C 7 SECTION B NO 9(a)

MARKING CRITERIA (i) State the light phenomenon correctly - Total internal reflection (ii) State the function of objective lens correctly - used to produce a real, inverted and magnified image // intermediate image State the function of eyepiece correctly - as a magnifying glass (iii) State two advantages of using fibre optics correctly - can carry large amount of data/information - transmit signals with very little loss - can transmit large amount of signals at one time - very much thinner and lighter

(b)

(i) Compare the size of object and the size of image correctly - in diagram 9.2/9.3 the size of object is equal to the size of image (ii) Compare the object distance and the image distance correctly - in diagram 9.2/9.3 the object distance is equal to the image distance

(c)

(i) Compare the focal lengths correctly - Focal length of lens X is shorter than the focal length of Y

MARK SUB TOTAL 1

1

1

1

2

1 1

2

1

1

2

1

(ii) Compare the thickness of lens correctly - Lens X is thicker than lens Y (iii) Relate the focal length to the thickness correctly - The thicker the lens, the shorter the focal length (d)

(i) Draw the ray diagram of a compound microscope correctly T Eye R

Object Fo

Fe

Image2

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1

1

3

MOZ@C 8

-

R as an eye piece and T as an objective lens Fe and Fo are not overlapped Light rays to form first image First image formed shown Light rays to form final image Final image formed shown

1 1 1 1 1 1

State the characteristics of final image correctly Virtual, magnified and inverted

(Any two) (ii) Suggestion on the modification to produce bigger image By using more powerful // shorter focal length lenses Suggestion on modification to produce brighter image By using a plane mirror near the object to reflect more rays / a lamp near the object/ Objective lens of bigger diameter

2

8

1

1

2

20

10(a)

(b)

(i)

(ii)

(c)

(d)

State the meaning correctly - Isotopes of an element are atoms having the same proton number but different neutron number.

1

State the use correctly - to detect radioactive radiations

1

State the use correctly - to record the radiations detected by the G-M tube

1

Describe the happenings correctly - The isotopes emit radioactive radiations

1

- The original nucleus changes into a different nucleus

1

Name the process correctly - Radioactive decay (disintegration)

1

State the meaning for nuclear fission correctly - The splitting of a heavy nucleus into two lighter nuclei

1

State the meaning for nuclear fusion correctly - The combining of two lighter nuclei to form a heavy nucleus

1

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1

2

3

MOZ@C 9 State there is a mass defect after reaction - The resulting nucleus (nuclei) formed has a smaller mass than the original nucleus (nuclei) State energy released due to mass defect - The mass defect caused energy to be released (resulting in a more stable nucleus /nuclei) (e)

(i)

(ii)

1

1

State how the radioisotope is used - The fertilizer that contains a radioisotope of one of the elements is injected into the soil/plant

1

State a waiting time - Wait for a few days for the fertilizer to be absorbed

1

State the use of the detectors - Use the G-M tube and ratemeter to detect the radiations

1

State how the analysis is done - The locations of where the fertilizer has gone to are located and analysed

1

State a suitable choice of half-life - The half-life should be a few days long

1

State a reason for the choice of half-life - This allows time for the fertilizer to be absorbed // the effect of the radiation to be minimised

1

State the suitable choice of radiations - The radiation emitted should be beta // gamma radiations

1

State a reason for the choice of radiations - This enables the radiations to penetrate the plant tissue (so that it can be detected)

1

State a suitable choice for the detector - The detector should be able to detect beta // gamma radiations

1

State a reason for the choice of detector - This enables the radiation to be detected

1

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4

4

6 20

MOZ@C 10 SECTION C NO 11(a)

(i)

(ii)

(b)

MARKING CRITERIA State the meaning correctly - Archimedes’ principle states that the buoyant force on an object immersed in a fluid is equal to the weight of fluid displaced by the object. Explain why a balloon filled with helium gas rises up in the air correctly - The balloon acted by two forces: Upthrust and the weight of the balloon - The density of helium gas is less than the density of surrounding air - Upthrust equals to the weight of the air displaced by the ballloon - Upthrust is higher than the weight of the balloon

MARK SUB TOTAL

1

1 1 1 1

M1 States a suitable size of the balloon - Large balloon

1

M2 State the reason for M1 correctly - To produce bigger buoyant / upthrust // Increase the volume of the air displaced

1

M3 State a suitable number of the burner - Use 2 burners // Many burners

1

M4 State the reason for M3 correctly - To produce bigger flame // heat up the gas in the balloon faster

1

M5 State a suitable type of fabric of the balloon - Synthetic nylon

1

M6 State the reason for M5 correctly - Light-weight, strong and air-proof material

1

M7 State a suitable temperature of the air in the balloon - High temperature of the air in the balloon

1

M8 State the reason for M7 correctly - Reduce the density /weight of the air in the balloon

1

M9 Choose the most suitable hot air balloon Hot air balloon Q is chosen

1

M10 State the reason correctly Large balloon, use 2 burners / many burners, use synthetic nylon and has high temperature of the air in the balloon // or combination of the reasons

1

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1

4

10

MOZ@C 11 (c)

(i)

(ii)

12(a)

(b)

Giving a correct equation Weight = buoyant force / weight of the water displaced

1

Substitute the equation correctly m x 10 = (10 x 2 x 10-6) x 1000 x 10

1

Correct answer with unit m = 0.02 kg /20 g

1

Show a correct substitution 20 = (12 x 2) ρ

1

Correct answer with unit ρ = 0.83 g cm-3

1

5 20

- Current that flows in one direction

1

1

State that the magnets produce a magnetic field - The (magnadur) magnets produce a magnetic field / diagram

1

Defines correctly

State that the current in the wire produces a magnetic field - The current in the wire produces a magnetic field / diagram

State that the two fields combine to form a resultant catapult field - The two magnetic fields interact/combine to form a resultant / catapult field / diagram

1

1

Diagram showing the catapult field and the force labelled

S

N

1 (c)

M1 State a suitable density - Low density material

1

M2 State the reason for M1 correctly - Coil has smaller mass / lighter

1

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4

MOZ@C 12

(d)

M3 State a suitable number of turns - High number of turns

1

M4 State the reason for M3 correctly - Larger force acting on the coil / higher electromagnetic field strength

1

M5 State a suitable strength of magnet - High strength magnets

1

M6 State the reason for M5 correctly - Larger force acting on the coil

1

M7 State a suitable number of segments - More segments

1

M8 State the reason for M7 correctly - Coil rotates smoothly

1

M9 Choose the most suitable motor - Motor R

1

M10 State the reason correctly - Lowest density, high number of turns, high strength magnets and commutator splits into the most number of segments

1

10

(i) Correct expression or answer 3 x 8 // 24 (J)

1

(ii) Correct expression 24 (e.c.f.) 5

1

Answer with correct unit 4.8 W

(iii) Correct expression 4 .8 4 .8  100 // (e.c.f.) 12 12 Correct answer 40% // 0.4

1

1

1

5 20

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