Skema 2007 Kedah

4531

SULIT 4531 Fizik September 2007

PERSIDANGAN KEBANGSAAN PENGETUA-PENGETUA SEKOLAH MENENGAH NEGERI KEDAH DARUL AMAN

PEPERIKSAAN PERCUBAAN SPM 2007

PHYSICS PERATURAN PEMARKAHAN

Peraturan pemarkahan ini mengandungi 17 halaman bercetak 4531

PEPERIKSAAN PERCUBAAN SPM 2007

2 KEDAH DARUL AMAN PERATURAN PEMARKAHAN

PHYSICS PAPER Paper 1 Paper 2 Paper 3

MARKS 50 100 40 190

Total

Jumlah markah diskalakan kepada 100% PHYSICS Paper 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

D A B C D D A C A D D C B B E B B A B C C E D C D

26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 PHYSICS Paper 2

B A D A A A B A C A C A B C D C D C B D D B C A B

3 SECTION A Question 1 1 1 (a) 1

(b)

2

(c)

1

State the distance and its units correctly 15 m

1

State the correct physical quantity Velocity // Speed

(i)

1

Describe the correct motion Constant / uniform velocity /speed

(ii)

1

Describe the correct motion Stationary / not moving / stops

(i)

1

State the correct type of error Zero error / systematic error

(ii)

1

State the time with its unit correctly 24.0 s

(i)

1

State the correct value of the period T = 1.20 s / 1.2 s

(ii)

1

4 Question 2 1 2 (a) 1 1

(b)

2

 g  2 T   4π 2 

Correct substitution in equation l =  10 4(3.142) 2

(1.2) 2

1

Answer with correct unit 0.3647 m / 0.365 m / 36.5 cm

1

Name the correct mirror

5

Question 3 1 3 (a)

4 Convex mirror 1

(b)

1

State one correct characteristic Upright / diminished / smaller / virtual

3

(c)

1

Draw a parallel ray from the object that is incident along a path parallel to the principal axis appears to go through the focal point 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 Determine the correct position of the image Describe the advantage correctly To increase the field of vision

1

(d)

1 1

Question 4 1 4 (a)

1

Name the type of transistor correctly Transistor NPN

(i)

1

(ii)

1

Showing the correct relationship between IB, IC and IE IB + IC = IE Correct substitution

1 6

1

(b)

2

V2 R2 = 6 R2 + 1500 1 2

(c)

(i)

1 1

1

(ii)

1

Correct answer with unit R2= 750 Ω State the correct answer The bulb will not light up State the correct reason Resistance R2 is small // V2 is small Give one of the uses correctly Current amplifier

7

Question 5 1 5 (a)

1

State the meaning of impulse correctly

5 Change in momentum 1

(b)

(i)

1

1

(b)

(ii)

1

1

(iii)

1

1

(iv)

1

1

(v)

1

2

(c)

1 1

State the correct comparison of the force Force on the egg in Diagram 5.2 is larger State the comparison in the time of impact correctly Time of impact for Surface A is longer / vice versa State the comparison in change in momentum correctly The change in momentum is the same State the relationship between the time of impact and the force produced in a collision correctly The time of impact is inversely proportional to the force produced in a collision State one suggestion correctly Sponge / carpet / towel / cloth / grass or any other acceptable materials State the time taken for impact correctly The time taken during the impact is small/short State the impulsive force produced on the pile correctly The impulsive force produced on the pile during impact is large

8 Question 6 1 6(a)

2

(b)

2

2

1

(i)

(ii)

(c)

(i)

2

State the meaning of induced current correctly The current that is induced by electromagnetic inductions when the circuit is complete//The current that can be produced without any electrical supply/source Label the polarity of each solenoid correctly

2

1 X: N 2 Y: S Label the direction of motion of each magnet correctly

2

Diagram 6.1 bar magnet towards the solenoid Diagram 6.2 bar magnet away from the solenoid State the type of force correctly 1 Repulsive 2

1

(ii)

1

Attractive

Name the law correctly Lenz’s Law

1

(d)

1

Correct suggestion Increase the speed of bar magnet/increase the number of turns of the solenoid/use a stronger magnet

Question 7 1 7 (a)

1

State the meaning of specific latent heat of fusion correctly Quantity of heat required to change 1 kg of a substance from solid to

8

6 1

(b)

2

(i)

1

(ii)

1

liquid without any change in temperature State the correct cup of coffee Cup B 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

1

State the assumption correctly No heat loss from the coffee to surroundings

1

State the type of wave correctly Electromagnetic waves/transverse waves

(i)

1

(ii)

2

Name the phenomenon correctly Diffraction Name the two factors correctly 1 Wavelength 2 Width separation Shows a correct substitution 3.0 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 Correct answers with unit 1 6m 2 0.6 m // 60 cm 3 0.06 m // 6 cm State the most suitable radio frequency and correct explanation 1 50 MHz 2 wavelength > width separation Name the wave correctly Microwave

(ii)

10 Question 8 1 8 (a) 1

(b)

2 4

(c)

1 3

2

(d)

2

2

(e)

1 1

Give the reason correctly Higher frequency//not easy to be diffracted // higher penetrating power

12 SECTION B Question 9 1 9 (a)

1

State the meaning correctly

7 Force exerted per unit area 5

(b)

1

Compare the depth correctly

2

The depth of the water in Diagram 9.1 is higher than that in Diagram 9.2 Compare the rate of water spurt out correctly

3

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

2

(ii)

1

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

6

(iii)

Water in the dam can be filtered and chlorinated to be used as public water supply To drive turbines for the generation of hydroelectricity// For irrigation//Recreation centre Give 3 suggestions correctly Give 3 suitable explanations correctly

20

Suggestion Thicker wall at the base

Explanation To withstand greater pressure at the bottom as the

8 The wall is constructed using stronger materials / Using reinforce concrete Equipped with the water overflow system Question 10 1 10 (a) 2

(b)

1 (i)

1

2

1

(ii)

1

pressure increases with depth To avoid the wall from breaking / To increase the strength of the wall / To avoid leaking To avoid flooding / To channel away the overflow water

State the meaning correctly The spontaneous disintegration of an unstable nucleus accompanied by emission of energetic particles State the time taken for the activity of source A to become half correctly The time taken for the activity of A to be half its original value is constant (5 hrs) State the time taken for the activity of source B to become half correctly The time taken for the activity of B to be half its original value is constant (100 s) 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 This time does not depend on the initial activity of the source

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

4

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))

Question 10 (continued) 4 (d) 1

State that the radioactive substance is mixed with water

9

2

6

(iii)

Put a radioactive substance into the water and let the water flow to the location of the leak State the use of detector to detect the radioactive rays correctly

3

After some time use a radiation detector above the ground to detect the location of increased activity State the location of the detector correctly when there is an increasing activity This position is the location of the leak

4

State the explanation correctly The radioactive substance would flow out together with the water and remain outside the pipe Give 3 suggestions correctly Give 3 suitable explanations correctly

20 Suggestion The half-life should be a few days long The source should emit γ particles The detector should be able to detect γ particles (low ionising particles)

Explanation This allows for the location to be detected and thereafter the radioactive contamination is reduced This enables the radiation to be detected above the ground High ionising particles like α and β particles are absorbed by the ground

SECTION C Question 11

10 1

11(a)

(i)

1

State the equation correctly refractive index =

4

(ii)

1

speed of light in vacuum speed of light in the mediujm

2

Diagram shows a curved optical fibre (with outer and internal layer) with at least two total internal reflection State the relationship of the refractive index correctly

3

The refractive index of the internal layer of the optical fibre is greater than that of the external layer or air 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 transmitted State 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 great strength

8

The optical fibre can last longer/not easily spoil Choose the most suitable material and justify the choice

4

(b)

(i)

9

Material R

10

High refractive index, low % of light energy absorbed, weak rigidity and great strength State the comparison correctly

1

The coin appears 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 4 16 = 3 x

4

Correct answer with unit 12 cm

Question 11 (continued)

11 1

(c)

1

State a suggestion correctly Add in more water//add in some salt solution

20

Question 12 1 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

2

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 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

10

State that the electrical appliances can be operated separately Only certain devices that are not in use can be switched off. The current can still flow through the other path State a suitable power and reason

(b) 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

Question 12 (continued)

9

Long fluorescent

10

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

12 5

(c)

(i)

1

Correct answer with unit 3.3 Ω//3.33 Ω

(ii)

2

Making a correct substitution 9=Ix5

3

Correct answer with unit 1.8 A

(iii)

4

Making a correct substitution 92 // (0.9)2 x 10 10

5

Making a correct substitution 8.1 W

20

PHYSICS

13 Paper 3 SECTION A Question 1 1 (a) 1 1

(i)

1

State the correct manipulated variable Length / L

(ii)

1

State the correct responding variable Resistance / R // Potential difference / V // Current / I

(iii)

1

1

State one fixed variable correctly Diameter of the wire // Cross-sectional area of the wire // Type of wire

1

(b)

5

(c)

1 5

State the correct use of the mirror Avoid parallax error Tabulate L, I, V and R correctly Give a tick (ü) based on the following: A — Columns L, I, V and R

ü

B

ü

— Correct units for I, V and R

C — All values of I correct

ü

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

ü

E

— All values of V correct

ü

F

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

ü

G — All values of R correct

ü

H — All values of R consistent to 2, 3 or 4 d.p. ü L / cm I/A V/V 20.0 0.36 0.4 30.0 0.42 0.7 40.0 0.50 1.1 50.0 0.62 1.7 60.0 0.70 2.3 Note for G : Accept e.c.f. from C and E Marks awarded : Number of ü 8ü 6-7ü 4-5ü 2-3ü 1ü Total marks : 5 Question 1 (continued) 5 (d) 5

Draw correctly a graph of R against L

Marks 5 4 3 2 1

R/Ω 1.11 1.67 2.20 2.74 3.29

14 Give a tick (ü) based on the following: A — y-axis, L at the x-axis

R at the ü

B

— Correct units at both axes

ü

C

— Uniform scale at both axes

ü

D

— 5 points plotted correctly

üü

[Note : 3 or 4 points plotted correctly : ü] E

— Best straight line

ü

F

— Minimum size of graph 5 x 4 big squares (Big square : 2 cm x 2 cm) (From the origin to the last point)

ü

Marks awarded : Number of ü 7ü 5-6 ü 3-4 ü 2ü 1ü Total marks : 5 1

(e)

1

Marks 5 4 3 2 1

State 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 / R ∝L

For a straight line with positive gradient that does not pass through the origin, Resistance increases linearly with length 1

(f)

1

State 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

Question 2

15 2

2 (a)

1

Draw the interpolation line from t = 3.8 s to the curve and from the curve to the v - axis

2

State the correct value of v 28 m s–1

2

2

(b)

1

Draw the horizontal line v = 51 to the v - axis

2

State the correct value of the terminal velocity

1

51 m s–1 State how the acceleration initially changes with time The acceleration decreases as time increases State how the acceleration subsequently changes with time The acceleration becomes zero Draw a tangent to the curve correctly at t = 6 s

2

Construct a sufficiently large triangle using the tangent drawn

3

Make the correct substitution

1

(c)

2 4

(d)

(i)

56 − 20 10.6 − 1.0

2

(ii)

4

State the correct value with unit 3.75 m s–2

1

Make correct substitution 0.20 x 3.75 State correct answer with unit 0.75 N

2 12

Section B

16 Question 3 1

3(a)

1

1

(b)

1

10

(c)

(i)

1

(ii)

2

3 (iii)

4

(iv)

5

(v)

6 7

8

(vi)

9

10 12

Question 4

Write a suitable inference The object distance affects the size of the image Write a suitable hypothesis The greater the object distance, the smaller the size of the image State the aim of the experiment To investigate the relationship between the object distance and the size of the image State the manipulated variable and responding variable Manipulated variable : object distance, u Responding variable : size of the image, H State the fixed variable Focal length of the lens / type of lens State the list of apparatus and materials Convex lens with holder, light bulb with power supply, screen, metre rule Draw a functional arrangement of the apparatus Light bulb in holder connected to power supply// Cross-wire as the object in front of the bulb, convex lens in holder and screen – all align. State how the manipulated variable is controlled The convex lens is placed at distance of, u = 15 cm from the object State how the responding variable is measured The screen is adjusted until a sharp image is formed on it. The size of the image, H is measured. State how the procedure is repeated to obtain at least 5 sets of results The procedure is repeated with values of u = 20 cm, 25 cm, 30 cm, 35 cm and 40 cm. State how the data is tabulated u / cm H / cm 15 20 25 30 35 40 State how the data is analysed A graph of H against u is drawn

17 1

4(a)

1

1

(b)

1

10

(c)

(i)

1

(ii)

2

3 (iii)

4

(iv)

5

(v)

6

7

8

(vi)

9 10

12

Write a suitable inference The current affects the strength of the magnetic field of an electromagnet Write a suitable hypothesis The greater the current, the stronger the magnetic field Write the aim of the experiment To investigate the relationship between the current and the strength of the magnetic field of an electromagnet. State the manipulated variable and responding variable Manipulated variable : current, I Responding variable : number of paper clips, N State the fixed variable The number of turns of the coil State the complete list of apparatus and materials D.c. power supply, ammeter, rheostat, petri dish, retort stand with clamp, paper clips, soft iron rod, insulated copper wire, and connecting wires. Draw a functional diagram of the apparatus State how the manipulated variable is controlled The current was switched on. The rheostat was adjusted to obtain a current of 0.5 A State how the responding variable is measured The number of paper clips, N attracted to the soft iron rod was counted State how the procedure is repeated to obtain at least 5 sets of results The 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 State how the data is tabulated 3.0 State how the data is analysed A graph of N against I is drawn