physics scheme kedah 2008

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    PERSIDANGAN KEBANGSAAN PENGETUA-PENGETUASEKOLAH MENENGAH

    NEGERI KEDAH DARUL AMAN

    PEPERIKSAAN PERCUBAAN SPM 2008

    PHYSICS

    PERATURAN PEMARKAHAN

    Peraturan pemarkahan ini mengandungi halaman bercetak

    4531

    SULIT4531Fizik September2008

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    PEPERIKSAAN PERCUBAAN SPM 2008KEDAH DARUL AMAN

    PERATURAN PEMARKAHAN

    PHYSICSPAPER MARKSPaper 1 50Paper 2 100Paper 3 40

    Total 190

    Jumlah markah diskalakan kepada 100%

    PHYSICSPaper 1

    1 B 26 D2 D 27 C3 B 28 A4 B 29 D5 C 30 C6 B 31 C7 D 32 B8 B 33 B

    9 C 34 C10 A 35 A11 A 36 A12 D 37 C13 B 38 D14 B 39 D15 C 40 D16 A 41 A17 B 42 C18 D 43 C19 B 44 A20 A 45 C21 A 46 A22 C 47 A23 D 48 C24 D 49 C25 A 50 D

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    PHYSICSPaper 2

    SECTION AMARK NO. MARKING CRITERIA

    SUB TOTAL

    1 (a) State the sensitivity of the metre rule correctly - 0.1 cm 1

    (b) (i) State the diameter of five ball bearings correctly- 3.0 cm 1

    (ii) State the diameter of one ball bearing correctly- 0.6 cm 1

    (c) State the instrument correctly - Vernier callipers 1 4

    2(a) (i) State the meaning of acceleration correctly- Rate of change of velocity 1

    (ii) Mark the point correctly- X at the point (5, 30) 1

    (b) Show the substitution correctlyError! (10 + 30) 2 1

    Answer with correct unit40 m 1

    (c) Sketch the graph correctly- Curve of the same shape but higher gradient 1 5

    3(a) State the principle correctly- Pascals principle 1

    (b) (i) Answer with correct unit2.5 N cm -2 // 2.5 x 10 4 N m -2 1

    (ii) Compare the pressure correctly- same pressure 1

    (iii) Show the substitution correctly2.5 x 5 1Answer with correct unit12.5 N 1

    (c) State the reason correctly- Liquid cannot be compressed easily 1 6

    NO. MARKING CRITERIA MARK

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    SUB TOTAL

    4(a) Name the principle correctly- Thermionic emission 1

    (b) (i) Describe the motion correctly- Uniform acceleration 1

    (ii) Describe the motion correctly - Uniform velocity 1

    (c) (i) State the correct answer- Alternating current 1

    (ii) Calculate the period correctlyT = 3 x 0.02 = 0.06 s 1State the frequency and unit correctlyf = Error! Error! = Error! = 16.7 Hz

    1

    (iii) Sketch the waveform correctly- Sinusoidal with one complete cycle 1 7

    5(a) (i) Name the force correctly- Gravitational force / Gravity / Weight 1

    (ii) Name the type of motion correctly - Free fall 1

    (b) (i) Compare the force on the coconuts correctly- In Diagram 5.1, the force is higher/greater // vice

    versa

    1

    (ii) Compare the change in momentum correctly - The change in momentum is the same for both

    diagrams.1

    (iii) Compare the time of impact between the coconutsand their landing ground correctly - In Diagram 5.1, the time of impact is shorter // vice

    versa1

    (c) Relate the force and the time of impact correctly- The shorter the time of impact, the greater the force 1

    (d) Name the force correctlyImpulsive force 1

    (e) State the field event correctly - High jump / Long jump / Triple jump 1 8

    NO. MARKING CRITERIA MARK

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    SUB TOTAL6(a) (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 1

    -Energy decreases 1(iii) State the phenomenon correctly

    Diffraction 1(iv) State the change to the speed of the wave correctly

    Unchanged / same 1

    (b) (i) State the correct situation at PVibrates/Oscillates 1

    (ii) State the correct situation at QStationary 1

    (c) Name the phenomenon correctlyreflection 1 8

    7(a) (i) State the meaning of heat correctly

    - The energy transferred from a hot object to a coldobject // the energy transfer because of the differencein temperature 1

    (ii) Explain how the heat is removed correctly

    - The temperature of the forehead is higher than thetemperature of the pad 1

    - Heat is transferred from the forehead to the pad 1

    (b) Show the temperature change correctly

    36 15 1

    Show the correct substitution

    Q = 30 4.3 (36 15) 1

    Answer with correct unit2709 J 1

    (c) 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 1Give suggestion 2 correctly

    - Use a gel with higher specific heat capacity 1

    Give reason 2 correctly

    - The heat removed increases with the specific heatcapacity of the gel // the heat removed is directly

    proportional to the specific heat capacity of the gel 1 10

    NO. MARKING CRITERIA MARK

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    SUB TOTAL

    8(a) 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 physicalconditions remain constant) 1

    (b) (i) State that the Ohms law is not obeyed- Ohms law is not obeyed 1

    (ii) State the reason correctly- The resistance of the conductor is extremely high 1

    (iii) Show the method to obtained the current- From the graph, when V = 2.0 V, I = 4.6 x10 -3 A 1Correct answers with unit

    R = Error! = Error!

    = 434.8

    1

    (c) (i) Match the answers correctly- X with K 1- Y with M 1- Z with L 1

    (ii) Give the reasons correctly- Gradient of the graph represents the effective

    resistance of the circuit 1- Series circuit has higher resistance // Parallel circuit

    has lower resistance 1

    (iii) Show the method correctly R = Gradient of graph P = Error!

    1Answer with correct unit = 3 1 12

    SECTION B

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    MARK NO MARKING CRITERIA SUB TOTAL

    9(a) (i) State the light phenomenon correctly - Total internal reflection 1 1

    (ii) State the function of objective lens correctly

    - used to produce a real, inverted and magnified image //intermediate image 1

    State the function of eyepiece correctly - as a magnifying glass 1 2

    (iii) State two advantages of using fibre optics correctly - can carry large amount of data/information 1 - transmit signals with very little loss 1 - can transmit large amount of signals at one time - very much thinner and lighter 2

    (b) (i) Compare the size of object and the size of imagecorrectly - in diagram 9.2/9.3 the size of object is equal to the sizeof image

    1

    (ii) Compare the object distance and the image distancecorrectly - in diagram 9.2/9.3 the object distance is equal to theimage distance

    1 2

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

    of Y 1

    (ii) Compare the thickness of lens correctly - Lens X is thicker than lens Y 1

    (iii) Relate the focal length to the thickness correctly - The thicker the lens, the shorter the focal length 1 3

    (d) (i) Draw the ray diagram of a compound microscopecorrectly

    Object

    T

    Fe Fo

    R Eye

    Image2

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    - R as an eye piece and T as an objective lens- F e and F o are not overlapped- Light rays to form first image- First image formed shown- Light rays to form final image- Final image formed shown

    111111

    State the characteristics of final image correctly Virtual, magnified and inverted (Any two) 2 8

    (ii) Suggestion on the modification to produce biggerimage By using more powerful // shorter focal length lenses 1

    Suggestion on modification to produce brighterimage By using a plane mirror near the object to reflect more

    rays / a lamp near the object/ Objective lens of bigger diameter

    1 2

    20

    10 (a) State the meaning correctly

    - Isotopes of an element are atoms having the same proton number but different neutron number. 1 1

    (b) (i) State the use correctly

    - to detect radioactive radiations 1

    (ii) State the use correctly

    - to record the radiations detected by the G-M tube 1 2

    (c) 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 3

    (d) 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 heavynucleus 1

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    State there is a mass defect after reaction

    - The resulting nucleus (nuclei) formed has a smaller mass than the original nucleus (nuclei) 1

    State energy released due to mass defect

    - The mass defect caused energy to be released (resultingin a more stable nucleus /nuclei) 1 4

    (e) (i) State how the radioisotope is used

    - The fertilizer that contains a radioisotope of one of theelements 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 theradiations 1

    State how the analysis is done

    - The locations of where the fertilizer has gone to arelocated and analysed 1 4

    (ii) 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 // theeffect of the radiation to be minimised 1

    State the suitable choice of radiations

    - The radiation emitted should be beta // gammaradiations 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 // gammaradiations 1

    State a reason for the choice of detector - This enables the radiation to be detected 1 6

    20

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    SECTION C

    MARK NO MARKING CRITERIA SUB TOTAL

    11 (a) (i) State the meaning correctly

    - Archimedes principle states that the buoyant forceon an object immersed in a fluid is equal to theweight of fluid displaced by the object. 1 1

    (ii) Explain why a balloon filled with helium gas rises upin the air correctly- The balloon acted by two forces: Upthrust and the

    weight of the balloon 1- The density of helium gas is less than the density of

    surrounding air 1- Upthrust equals to the weight of the air displaced by

    the ballloon 1- Upthrust is higher than the weight of the balloon 1 4

    (b) 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 theballoon- 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 balloonHot air balloon Q is chosen 1

    M10 State the reason correctly Large balloon, use 2 burners / many burners, usesynthetic nylon and has high temperature of the air inthe balloon // or combination of the reasons 1 10

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    (c) (i) Giving a correct equationWeight = buoyant force / weight of the water displaced 1

    Substitute the equation correctlym x 10 = (10 x 2 x 10 -6) x 1000 x 10 1

    Correct answer with unitm = 0.02 kg /20 g 1

    (ii) Show a correct substitution20 = (12 x 2) 1

    Correct answer with unit = 0.83 g cm -3 1 5

    20

    12 (a) Defines correctly

    - Current that flows in one direction 1 1

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

    diagram1

    State that the current in the wire produces amagnetic field

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

    1

    State that the two fields combine to form a resultantcatapult field- The two magnetic fields interact/combine to form a

    resultant / catapult field / diagram 1

    Diagram showing the catapult field and the forcelabelled

    1 4(c) M1 State a suitable density

    - Low density material 1

    M2 State the reason for M1 correctly- Coil has smaller mass / lighter 1

    S N

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    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

    (d) (i) Correct expression or answer3 x 8 // 24 (J) 1

    (ii) Correct expression

    524

    (e.c.f.) 1

    Answer with correct unit4.8 W 1

    (iii) Correct expression

    10012

    8.4 //

    128.4

    (e.c.f.) 1

    Correct answer40% // 0.4 1 5

    20

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    PHYSICSPaper 3

    SECTION A

    MARK NO MARKING CRITERIA SUB TOTAL

    1(a) (i) State the manipulated variable correctly- Time 1 1

    (ii) State the responding variable correctly- Temperature // Increase in temperature 1 1

    (iii) State the constant variable correctly- Mass of the water, power of the heater 1 1

    (b) State the value of 0 within the acceptable range 0 = 25 oC 1 1

    (c) (i) Record the readings of correctlyAll five readings of correct 1 1

    (ii) Tabulate the results for t, and correctly

    t / s / oC / oC 20 32 740 39 1460 46 2180 53 28

    100 60 35

    Give a tick ( ) based on the following:A Columns t, and B Correct units for t, and C All 5 values of correct

    D All 5 values of correct [Note : 3 or 4 values of correct : ]E All values of and

    written as whole numbers or consistent to 0.5 oC.

    Marks awarded :

    Number of Marks6 55 4

    3 - 4 32 21 1

    5 5

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    (d) Draw a complete graph of against t

    Give a tick ( ) based on the following:

    A at the y-axis, t at the x-axis B Correct units at both axes

    C Uniform scale at both axesD 5 points plotted correctly

    [Note : 4 points plotted correctly : ] E Line of best fit is drawnF Minimum size of graph 5 x 4 big squares

    (Big square : 2 cm x 2 cm)(From the origin to the last point)

    Marks awarded : Number of Marks

    7 55-6 43-4 3

    2 21 1

    5 5

    (e) State the correct relationship between and t is directly proportional to t 1

    16

    2(a) (i) State the correct relationship

    f x1 // f is inversely proportional to x

    1 1(ii) Determine the value of

    x1 correctly

    x1 = 0.5 1

    Draw the intrapolation line from x1 = 0.5 to the

    given line and from the given line to the f axis 1

    State the value of f within the acceptable range380 Hz 400 Hz 1 3

    (iii) Calculate the gradient of the graph, m , and state thevalue of m within the acceptable range-Draw a sufficiently large triangle 1

    -Correct substitution (Follow candidates triangle) 1

    -State the value/answer with correct unit770 Hz m to 790 Hz m // 770 m s -1 to 790 m s -1 1 3

    (b) State the correct expression

    v = Daxf 1 1

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    (c) Calculate the value of the velocity and state thevalue within the acceptable range-Correct substitution

    v =8.2

    (770)2.1 to

    8.2(790)2.1

    1

    -State the value of velocity with correct unit330 to 339 m s -1 1 2

    (d) State two correct precautions- Carry out the experiment in an open space- Position of the eyes must be align with the scale on the

    metre rule- Place the two speakers closer (so that the value of x is

    big enough to be measured)

    11

    1

    Max 2 2

    12

    SECTION B

    MARK NO MARKING CRITERIA SUB TOTAL

    3 (a) State a suitable inference

    The force applied affects the acceleration of an object. 1 1(b) State a relevant hypothesis

    The greater the force, the greater the acceleration 1 1(c) Describe a complete and suitable experimental

    framework (i) State the aim of experiment

    To investigate the relationship between the force andacceleration of a trolley

    1

    (ii) State the manipulated variable and the respondingvariableManipulated variable : ForceResponding variable : Acceleration

    States the constant variableFixed variable : Mass of the trolley

    11

    (iii) List out the important apparatus and materialsTrolley, 5 rubber bands, friction compensated track,ticker timer, ticker tape, a.c. power supply, ruler

    1

    (iv) State a functionable arrangement of the apparatus 1

    Track

    Trolley

    Ticker tape timer

    Ticker tapePull

    Rubber band

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    (v) State the method of controlling the manipulated variableThe ticker timer was switched on and the trolley pulled

    by 1 rubber band stretched to a certain length.1

    (vi) State the method of measuring the responding variableThe acceleration of the trolley was calculated from theticker tape obtained

    1

    (vii) State how the procedure is repeated to obtain at least 5sets of resultsSteps 5 and 6 were repeated with 2, 3, 4 and 5 rubber

    bands stretched to the same length

    1

    (viii) Tabulate the data

    Force, F /Number of rubber bands

    Acceleration, a / cm s 2

    12345 1

    (ix) State how data will be analysedThe graph of acceleration, a against force, F was drawn. 1 10

    12

    4 (a) State a suitable inferenceThe current affects the strength of the magnetic field of an electromagnet

    1 1

    (b) State a relevant hypothesisThe greater the current, the stronger the magnetic field

    1 1

    (c)(i)

    Describe a complete and suitable experimentalframework State the aim of experimentTo investigate the relationship between the current andthe strength of the magnetic field of an electromagnet.

    1(ii) State the manipulated variable and the responding

    variableManipulated variable : currentResponding variable : strength of the magnetic field

    States the constant variableThe number of turns of the coil

    1

    1(iii) List out the important apparatus and materials

    D.c. power supply, ammeter, rheostat, petri dish andretort stand with clamp, paper clips, soft iron rod,insulated copper wire, and connecting wires. 1

    (iv) State a functionable arrangement of the apparatus 1

    (v) State the method of controlling the manipulated variableThe current was switched on. The rheostat was adjustedto obtain a current of 0.5 A 1

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    (vi) State the method of measuring the responding variableThe number of paper clips, N attracted to the soft ironrod was counted

    1(vii) State how the procedure is repeated to obtain at least 5

    sets of resultsThe procedure was repeated for the values of current, I = 1.0 A, 1.5 A, 2.0 A and 2.5 A 1

    (viii) Tabulate the data

    Current, I / A Number of pins attracted, N 0.51.01.52.02.5

    1

    (ix) State how data will be analysedA graph of N against I is drawn 1 10

    12

    END OF MARK SCHEME