4531

PERSIDANGAN KEBANGSAAN PENGETUA-PENGETUASEKOLAH MENENGAH

NEGERI KEDAH DARUL AMAN

PEPERIKSAAN PERCUBAAN SPM 2007

PHYSICS

PERATURAN PEMARKAHAN

Peraturan pemarkahan ini mengandungi 17 halaman bercetak

4531

PEPERIKSAAN PERCUBAAN SPM 2007

SULIT4531FizikSeptember2007

KEDAH DARUL AMAN

PERATURAN PEMARKAHAN

PHYSICS

PAPER MARKSPaper 1 50Paper 2 100Paper 3 40

Total 190

Jumlah markah diskalakan kepada 100%

PHYSICSPaper 1

1 D 26 B2 A 27 A3 B 28 D4 C 29 A5 D 30 A6 D 31 A7 A 32 B8 C 33 A9 A 34 C10 D 35 A11 D 36 C12 C 37 A13 B 38 B14 B 39 C15 E 40 D16 B 41 C17 B 42 D18 A 43 C19 B 44 B20 C 45 D21 C 46 D22 E 47 B23 D 48 C24 C 49 A25 D 50 B

PHYSICS

2

Paper 2

SECTION A

Question 11 1 (a) 1 State the distance and its units correctly

15 m

1 (b) 1 State the correct physical quantity Velocity // Speed

2 (c) (i) 1 Describe the correct motion Constant / uniform velocity /speed

(ii) 1 Describe the correct motion Stationary / not moving / stops

4

Question 21 2 (a) (i) 1 State the correct type of error

Zero error / systematic error

1 (ii) 1 State the time with its unit correctly24.0 s

1 (b) (i) 1 State the correct value of the period T = 1.20 s / 1.2 s

2 (ii) 1Correct substitution in equation 2

24T

gl

π

221214234

10).(

).(

1 Answer with correct unit

0.3647 m / 0.365 m / 36.5 cm5

3

Question 31 3 (a) 1 Name the correct mirror

Convex mirror

1 (b) 1 State one correct characteristicUpright / diminished / smaller / virtual

3 (c) 1 Draw a parallel ray from the object that is incident along a path parallel to the principal axis is appears to go through the focal point

1 A radial ray that is incident through the centre of curvature, C of the curved mirror is reflected back along the incident path through point C

1 Determine the correct position of the image1 (d) 1 Describe the advantage correctly

To increase the field of vision6

Question 41 4 (a) 1 Name the type of transistor correctly

Transistor NPN

1 (b) (i) 1 Showing the correct relationship between IB, IC and IE

IB + IC = IE

2 (ii) 1 Correct substitution

15006 2

22

R

RV

1 Correct answer with unitR2= 750 Ω

2 (c) (i) 1 State the correct answerThe bulb will not light up

1 State the correct reasonResistance R2 is small // V2 is small

1 (ii) 1 Give one of the uses correctlyCurrent amplifier

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4

Question 51 5 (a) 1 State the meaning of impulse correctly

Change in momentum

1 (b) (i) 1 State the correct comparison of the forceForce on the egg in Diagram 5.2 is larger

1 (b) (ii) 1 State the comparison in the time of impact correctlyTime of impact for Surface A is longer / vice versa

1 (iii) 1 State the comparison in change in momentum correctlyThe change in momentum is the same

1 (iv) 1 State the relationship between the time of impact and the force produced in a collision correctlyThe time of impact is inversely proportional to the force produced in a collision

1 (v) 1 State one suggestion correctlySponge / carpet / towel / cloth / grass or any other acceptable materials

2 (c) 1 State the time taken for impact correctlyThe time taken during the impact is small/short

1 State the impulsive force produced on the pile correctlyThe impulsive force produced on the pile during impact is large

8

Question 61 6(a) 1 State the meaning of induced current correctly

The current that induced by electromagnetic inductions when the circuit is complete//The current that can be produced without any electrical supply/source

2 (b) (i) 2 Label the polarity of each solenoid correctly

1 X: N

2 Y: S

2 (ii) 2 Label the direction of motion of each magnet correctly

Diagram 6.1 bar magnet towards the solenoidDiagram 6.2 bar magnet away from the solenoid

2 (c) (i) 2 State the effect of the polarity at the end of the solenoid on the motion of the bar magnet correctly1 When the bar magnet is pushed towards the solenoid, the end of

the solenoid facing the bar magnet has the same polarity as the bar magnet

2 When the bar magnet is pulled away from solenoid, the end of the solenoid facing the bar magnet has the opposite polarity as the bar magnet

1 (ii) 1 Name the law correctly

Lenz’s Law

1 (d) 1 Correct suggestionIncrease the speed of bar magnet/increase the number of turns of the solenoid/use a stronger magnet

8

Question 7

5

1 7 (a) 1 State the meaning of specific latent heat of fusion correctlyQuantity of heat required to change 1 kg of a substance from solid to liquid without any change in temperature

1 (b) (i) 1 State the correct cup of coffeeCup B

2 (ii) 1 State the explanation correctly

The ice is exposed to the surroundings

1 State the explanation correctly

The ice absorb heat from the surroundings

2 (c) 1 Shows a correct substitution

Heat released = 0.2 x 4500 x (75.5 - 25)

1 Correct answer with unit

45450 J

3 (d) (i) 1 Shows the expression correctly

mi x 3.36 x 105 + mi x 4200 (25 – 0)

1 Shows the correct substitution

mi x 3.36 x 105 + mi x 4200 (25 – 0) = 45450

1 Correct answer with unit

0.103 kg

1 (ii) 1 State the assumption correctlyNo heat loss from the coffee to surroundings

10

Question 81 8 (a) 1 State the type of wave correctly

Electromagnetic waves/transverse waves

1 (b) (i) 1 Name the phenomenon correctlyDiffraction

2 (ii) 2 Name the two factors correctly1 Wavelength2 Width separation

4 (c) 1 Shows a correct substitution3.0 x 108 = 50 x 106 x λ // 3.0 x 108 = 500 x 106 x λ //3.0 x 108 = 5 x 109 x λ

3 Correct answers with unit1 6 m2 0.6 m // 60 cm3 0.06 m // 6 cm

2 (d) 2 State the most suitable radio frequency and correct explanation1 50 MHz2 wavelength > width separation

2 (e) 1 Name the wave correctly Microwave

1 Give the reason correctlyHigher frequency//not easy to be diffraction//higher penetrating

power12

SECTION B

6

Question 91 9 (a) 1 State the meaning correctly

Force exerted per unit area

5 (b) 1 Compare the depth correctly

The depth of the water in Diagram 9.1 is higher than that in Diagram 9.2

2 Compare the rate of water spurt out correctly

The water spurts out in Diagram 9.1 is at a higher rate than that in Diagram 9.2

3 Compare the distance which the water spurts out correctly

The water spurts out further in Diagram 9.1 than that in Diagram 9.2

4 Relate the depth of water spurt with the distance of water correctlyThe deeper the water, the further the distance of water spurt

5 Relate the depth of water with the pressure of water correctly

The deeper the water, the higher the pressure of the water

2 (c) (i) 1 Relate the pressure with the depth of water correctly

The pressure of water increases with the depth of the water

2 Relate the changes of volume of air bubble with the depth of water correctlyThe bubble expands upon reaching the surface of the water//The volume of air bubble increases as the depth of water decreases

2 (ii) 1 Relate the buoyant force with the volume of air bubble correctly

Buoyant force increases as the volume of the bubble increases

2 State the motion of the air bubble correctly

The air bubble moving with increasing acceleration

2 (d) (i) 1 State the choice of the dam correctly

Diagram 9.3

2 State the correctly explanation

The weight of the dam is supported by the force exerted by the water

2 (ii) Give two of the uses correctly

1 Water in the dam can be filtered and chlorinated to be uses as public water supply

2 To drive turbines for the generation of hydroelectricity//For irrigation//Recreation centre

6 (iii) Give 3 suggestions correctlyGive 3 suitable explanations correctly

20

Suggestion Explanation

7

Thicker wall at the base To withstand greater pressure at the bottom as the pressure increases with depth

The wall is constructed using stronger materials / Using reinforce concrete

To avoid the wall from breaking / To increase the strength of the wall / To avoid leaking

Equipped with the water overflow system

To avoid flooding / To channel away the overflow water

Question 101 10 (a) 1 State the meaning correctly

The spontaneous disintegration of an unstable nucleus accompanied by emission of energetic particles

2 (b) (i) 1 State the time taken for the activity of source A to become half correctlyThe time taken for the activity of A to be half its original value is constant (5 hrs)

2 State the time taken for the activity of source B to become half correctlyThe time taken for the activity of B to be half its original value is constant (100 s)

1 (ii) 1 Compare the time taken between the sources correctly

This time is different for different substances

1 (iii) 1 State the common characteristic for the time taken

The time taken for the activity to become half its initial value is constant

1 (iv) 1 Name the time correctly

Half-life

4 (c) 1 State the meaning for nuclear fission correctly

The splitting of a heavy nucleus into two lighter nuclei

2 State the meaning for nuclear fusion correctly

the combining of two lighter nuclei to form a heavy nucleus

3 State there is a mass defect after reaction

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

4 State energy released due to mass defect

The mass defect caused energy to be released (resulting in a more stable nucleus (nuclei))

8

Question 10 (continued)4 (d) 1 State that the radioactive substance is mixed with water

Put a radioactive substance into the water and let the water flow to the location of the leak

2 State the use of detector to detect the radioactive rays correctly

After some time use a radiation detector above the ground to detect the location of increased activity

3 State the location of the detector correctly when there is an increasing activityThis position is the location of the leak

4 State the explanation correctly

The radioactive substance would flow out together with the water and remained outside the pipe

6 (iii) Give 3 suggestions correctlyGive 3 suitable explanations correctly

20

Suggestion Explanation

The half-life should be a few days long

This allows for the location to be detected and thereafter the radioactive contamination is reduced

The source should emit γ particles This allows the radiation to be able to be detected above the ground

The detector should be able to detect γ particles (low ionising particles)

High ionising particles like α and β particles are absorbed by the ground

9

SECTION CQuestion 11

1 11(a) (i) 1 State the equation correctly

4 (ii) 1 Diagram shows a curved optical fibre (with outer and internal layer) with at least two total internal reflection

2 State the relationship of the refractive index correctly

The refractive index of the internal layer of the optical fibre is greater than the external layer or air

3 State that the angle of incidence is greater than the critical angle

Angle of incidence, i > critical angle, c

4 State the correct phenomenon occur

Total internal reflection occur

10 (iii) States a suitable refractive index and reason

1 High refractive index

2 Total internal reflection can occur easily

State a suitable % of light energy absorbed and reason

3 Small amount of light energy being absorbed by the material

4 The object under observation can be seen clearly // more light can be transmittedState a suitable rigidity of the material and reason

5 Material with weak rigidity

6 The optical fibre can be bent easily

State a suitable strength of the material and reason

7 Material with strong strength

8 The optical fibre can last longer/not easily spoil

Choose the most suitable material and justify the choice

9 Material R

10 High refractive index, low % of light energy absorbed, weak rigidity and strong strength

4 (b) (i) 1 State the comparison correctly

The coin appear bigger when seen by observer B

2 State the reason correctly

The coin is nearer to the observer B

(ii) 3 Making a correct substitution

x

16

3

4=

4 Correct answer with unit

12 cm

Question 11 (continued)

10

1 (c) 1 State a suggestion correctly

Add in more water//add in some salt solution

20

Question 121 12(a) (i) 1 Diagram shows the connection correctly

Three resistors are connected one after another

4 (ii) 1 State the current through each appliance correctly

The current through each electrical appliance is higher//The bulbs in the parallel circuit light up brighter compared to the same bulbs in series circuit// Effective resistance is much smaller when connected in parallel circuit

2 State that each electrical appliance is independent of the other

If any devices/components broke down, others can still be used

3 State the installation of circuit breaker

The circuit breaker / fuse can be connected to each path for safety

4 State that the electrical appliances can be operated separately

Only certain devices that are not in used can be switched off. The current can still flow through the other path

10 (b) State a suitable power and reason

1 Low power lamp

2 Safe cost//electric bill

State a suitable efficiency and reason

3 High efficiency

4 The room looks brighter//high output power//less power wastage

State a suitable life span and reason

5 Long life span

6 No need to replace often

State a suitable price and reason

7 Low price

8 Save money/cost

Choose the most suitable lamp and justify the choice

9 Long fluorescent

10 Low power with highest efficiency, long hours of life span and medium price

Question 12 (continued)

11

5 (c) (i) 1 Correct answer with unit

3.3 //3.33

2 Making a correct substitution

9 = I x 5

3 Correct answer with unit

1.8 A

4 Making a correct substitution

10

29 // (0.9)2 x 10

5 Making a correct substitution

8.1 W

20

PHYSICS

12

Paper 3

SECTION A

Question 11 1 (a) (i) 1 State the correct manipulated variable

Length / L/

1 (ii) 1 State the correct responding variable

Resistance / R // Potential difference / V // Current / I

1 (iii) 1 State one fixed variable

Diameter of the wire // Cross-sectional area of the wire // Type of wire

1 (b) 1 State the correct use of the mirrorReduce parallax error

5 (c) 5 Tabulate L, I, V and R correctly

Give a tick () based on the following:

A Columns L, I, V and R

B Correct units for I, V and R

C All values of I correct

D All values of I consistent to 2 d.p.

E All values of V correct

F All values of V consistent to 1 or 2 d.p.

G All values of R correct

H All values of R consistent to 2, 3 or 4 d.p.

L / cm I / A V / V R / Ω20.0 0.36 0.4 1.1130.0 0.42 0.7 1.6740.0 0.50 1.1 2.2050.0 0.62 1.7 2.7460.0 0.70 2.3 3.29

Note for G : Accept e.c.f. from C and E

Marks awarded :

Number of Marks8 5

6 - 7 44 - 5 32 - 3 2

1 1

Total marks : 5

Question 1 (continued)

13

5 (d) 5 Draw correctly a graph of R against L

Give a tick () based on the following:

A R at the y-axis, L at the x-axis

B Correct units at both axes

C Uniform scale at both axes

D 5 points plotted correctly

[Note : 3 or 4 points plotted correctly : ]

E Best straight line

F 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 Marks7 5

5-6 43-4 32 21 1

Total marks : 5

1 (e) 1 States the correct relationship based on the straight line drawn

For a straight line with positive gradient passing through the origin,

Resistance is directly proportional to length / R directly proportional to L /

For a straight line with positive gradient that does not pass through the origin,

Resistance increases linearly with length

1 (f) 1 States one suitable precaution

Check the voltmeter for zero error and make zero adjustment // Position of the eye such that the image of the pointer in the mirror is blocked by the pointer to avoid parallax error

16

14

Question 22 2 (a) 1 States the correct value of v

28 m s–1

2 Draws the intrapolation line from t = 3.8 s to the curve and from the curve to the v - axis

2 (b) 1 States the correct value of the terminal velocity

51 m s–1

2 Draws the line v = 51 to the v - axis

2 (c) 1 States how the acceleration initially changes with timeThe acceleration decreases as time increases

2 States how the acceleration subsequently changes with timeThe acceleration becomes zero

4 (d) (i) 1 Draws a tangent to the curve at t = 6 s

2 Constructs a triangle using the tangent drawn

3 Writes the correct expression for the gradient

4 States the correct value of the gradient3.75 m s–2

2 (ii) 1 Makes correct substitution0.20 x 3.75

2 Correct answer with unit0.75 N

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Section B

Question 31 3(a) 1 Writes a suitable inference

The object distance affects the size of the image

1 (b) 1 Writes a suitable hypothesisThe greater the object distance, the smaller the size of the image

10 (c) (i) 1 Writes the aim of the experimentTo investigate the relationship between the object distance and the size of the image

(ii) 2 States the manipulated variable and responding variableManipulated variable : object distance, uResponding variable : size of the image, H

3 States the fixed variableFocal length of the lens / type of lens

(iii) 4 States the list of apparatus and materialsConvex lens with holder, light bulb with power supply, screen, metre rule

(iv) 5 Draws a labeled and functional diagram of the set up of the apparatusLight bulb in holder connected to power supply, object in front of bulb, convex lens in holder and screen – all in line.

(v) 6 States how the manipulated variable is controlledThe convex lens is placed at distance of, u = 15 cm from the object

7 States how the responding variable is measuredThe screen is adjusted until a sharp image is formed on it. The size of the image, H is measured with a ruler.

8 States how the procedure is repeated to obtain at least 5 sets of resultsThe procedure is repeated with values of u = 20 cm, 25 cm, 30 cm, 35 cm and 40 cm.

(vi) 9 Constructs a table showing the suggested values of the manipulated variable

u / cm H / cm

15

20

25

30

35

40

10 States the graph to be drawnA graph of H against u is drawn

12

16

Question 41 4(a) 1 Writes a suitable inference

The current affects the strength of the magnetic field of an electromagnet

1 (b) 1 Writes a suitable hypothesisThe greater the current, the stronger the magnetic field

10 (c) (i) 1 Writes the aim of the experimentTo investigate the relationship between the current and the strength of the magnetic field of an electromagnet.

(ii) 2 States the manipulated variable and responding variableManipulated variable : currentResponding variable : strength of the magnetic field

3 States the fixed variableThe number of turns of the coil

(iii) 4 States the list of apparatus and materialsD.c. power supply, ammeter, rheostat, petri dish and retort stand with clamp, paper clips, soft iron rod, insulated copper wire, and connecting wires.

(iv) 5 Draws a labeled and functional diagram of the set up of the apparatus

(v) 6 States how the manipulated variable is controlledThe current was switched on. The rheostat was adjusted to obtain a current of 0.5 A

7 States how the responding variable is measuredThe number of paper clips, N attracted to the soft iron rod was counted

8 States 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, 2.5 A and 3.0 A

(vi) 9 Constructs a table showing the suggested values of the manipulated variable

Current, I / A Number of pins attracted, N

0.5

1.0

1.5

2.0

2.5

3.0

10 States the graph to be drawnA graph of N against I is drawn

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