skema trial exam

17
4531 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 SULIT 4531 Fizik September 2007

Upload: nalla-thamby

Post on 16-Apr-2015

24 views

Category:

Documents


0 download

TRANSCRIPT

Page 1: Skema Trial Exam

4531

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

SULIT

4531

Fizik

September

2007

Page 2: Skema Trial Exam

2

PEPERIKSAAN PERCUBAAN SPM 2007

KEDAH DARUL AMAN

PERATURAN PEMARKAHAN

PHYSICS

PAPER MARKS

Paper 1 50

Paper 2 100

Paper 3 40

Total 190

Jumlah markah diskalakan kepada 100%

PHYSICS

Paper 1

1 D 26 B

2 A 27 A

3 B 28 D

4 C 29 A

5 D 30 A

6 D 31 A

7 A 32 B

8 C 33 A

9 A 34 C

10 D 35 A

11 D 36 C

12 C 37 A

13 B 38 B

14 B 39 C

15 E 40 D

16 B 41 C

17 B 42 D

18 A 43 C

19 B 44 B

20 C 45 D

21 C 46 D

22 E 47 B

23 D 48 C

24 C 49 A

25 D 50 B

PHYSICS

Page 3: Skema Trial Exam

3

Paper 2

SECTION A

Question 1

1 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 2

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

Zero error / systematic error

1 (ii) 1 State the time with its unit correctly

24.0 s

1 (b) (i) 1 State the correct value of the period

T = 1.20 s / 1.2 s

2 (ii) 1 Correct substitution in equation 2

24T

gl

π

221

214234

10).(

).(

1 Answer with correct unit

0.3647 m / 0.365 m / 36.5 cm

5

Page 4: Skema Trial Exam

4

Question 3

1 3 (a) 1 Name the correct mirror

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

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 image

1 (d) 1 Describe the advantage correctly

To increase the field of vision

6

Question 4

1 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 unit

R2= 750 Ω

2 (c) (i) 1 State the correct answer

The bulb will not light up

1 State the correct reason

Resistance R2 is small // V2 is small

1 (ii) 1 Give one of the uses correctly

Current amplifier

7

Page 5: Skema Trial Exam

5

Question 5

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

Change in momentum

1 (b) (i) 1 State the correct comparison of the force

Force on the egg in Diagram 5.2 is larger

1 (b) (ii) 1 State the comparison in the time of impact correctly

Time of impact for Surface A is longer / vice versa

1 (iii) 1 State the comparison in change in momentum correctly

The change in momentum is the same

1 (iv) 1 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

1 (v) 1 State one suggestion correctly

Sponge / carpet / towel / cloth / grass or any other acceptable

materials

2 (c) 1 State the time taken for impact correctly

The time taken during the impact is small/short

1 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) 1 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

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 solenoid

Diagram 6.2 bar magnet away from the solenoid

2 (c) (i) 2 State the type of force correctly

1 Repulsive

2 Attractive

1 (ii) 1 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

8

Question 7

Page 6: Skema Trial Exam

6

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

liquid without any change in temperature

1 (b) (i) 1 State the correct cup of coffee

Cup 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 // 45.45kJ // 4.545 X 104 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 correctly

No heat loss from the coffee to surroundings

10

Question 8

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

Electromagnetic waves/transverse waves

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

Diffraction

2 (ii) 2 Name the two factors correctly

1 Wavelength

2 Width separation

4 (c) 1 Shows a correct substitution

3.0 x 108 = 50 x 10

6 x λ // 3.0 x 10

8 = 500 x 10

6 x λ //

3.0 x 108 = 5 x 10

9 x λ

3 Correct answers with unit

1 6 m

2 0.6 m // 60 cm

3 0.06 m // 6 cm

2 (d) 2 State the most suitable radio frequency and correct explanation

1 50 MHz

2 wavelength > width separation

2 (e) 1 Name the wave correctly

Microwave

1 Give the reason correctly

Higher frequency//not easy to be diffracted // higher penetrating

power

12

SECTION B

Page 7: Skema Trial Exam

7

Question 9

1 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 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

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 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

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 used as public

water supply

2 To drive turbines for the generation of hydroelectricity//

For irrigation//Recreation centre

6 (iii) Give 3 suggestions correctly

Give 3 suitable explanations correctly

20

Page 8: Skema Trial Exam

8

Suggestion Explanation

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 10

1 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

correctly

The 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

correctly

The 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

This time is different for different substances

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))

Question 10 (continued)

Page 9: Skema Trial Exam

9

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 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

6 (iii) Give 3 suggestions correctly

Give 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 enables the radiation 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

SECTION C

Question 11

Page 10: Skema Trial Exam

10

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

mediumtheinlightofspeed

vacuuminlightofspeedindexrefractive

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 that of 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

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

9 Material R

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

and great strength

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

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

x

16

3

4=

4 Correct answer with unit

12 cm

Question 11 (continued)

Page 11: Skema Trial Exam

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

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 use 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)

Page 12: Skema Trial Exam

12

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

3.3 //3.33

(ii) 2 Making a correct substitution

9 = I x 5

3 Correct answer with unit

1.8 A

(iii) 4 Making a correct substitution

10

29// (0.9)

2 x 10

5 Making a correct substitution

8.1 W

20

PHYSICS

Page 13: Skema Trial Exam

13

Paper 3

SECTION A

Question 1

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

wire

1 (b) 1 State the correct use of the mirror

Avoid 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 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 / Ω

20.0 0.36 0.4 1.11

30.0 0.42 0.7 1.67

40.0 0.50 1.1 2.20

50.0 0.62 1.7 2.74

60.0 0.70 2.3 3.29

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

Marks awarded :

Number of Marks

8 5

6 - 7 4

4 - 5 3

2 - 3 2

1 1

Total marks : 5

Question 1 (continued)

Page 14: Skema Trial Exam

14

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 Marks

7 5

5-6 4

3-4 3

2 2

1 1

Total marks : 5

1 (e) 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 / LR

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

Page 15: Skema Trial Exam

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 (b) 1 Draw the horizontal line v = 51 to the v - axis

2 State the correct value of the terminal velocity 51 m s

–1

2 (c) 1 State how the acceleration initially changes with time

The acceleration decreases as time increases

2 State how the acceleration subsequently changes with time

The acceleration becomes zero

4 (d) (i) 1 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

0.16.10

2056

4 State the correct value with unit

3.75 m s–2

2 (ii) 1 Make correct substitution

0.20 x 3.75

2 State correct answer with unit

0.75 N

12

Section B

Page 16: Skema Trial Exam

16

Question 3

1 3(a) 1 Write a suitable inference

The size of the image depends on the object distance.

1 (b) 1 Write a suitable hypothesis

When the object distance increase, the size of the image will decrease.

10 (c) (i) 1 State the aim of the experiment

To investigate the relationship between the object distance and the size of the image

(ii) 2 State the manipulated variable and responding variable

Manipulated variable : object distance, u

Responding variable : size of the image, H

3 State the fixed variable

Focal length of the lens / type of lens

(iii) 4 State the list of apparatus and materials

Convex lens with holder, light bulb with power supply, screen, metre rule

(iv) 5 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.

(v) 6 State how the manipulated variable is controlled

The convex lens is placed at distance of u1 cm from the object

7 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.

8 State how the procedure is repeated to obtain at least 5 sets of results

The procedure is repeated with values of u2 cm, u3 cm, u4 cm and u5 cm.

(vi) 9 State how the data is tabulated

u / cm H / cm

u1

u2

u3

u4

u5

10 State how the data is analysed

A graph of H against u is drawn

12

Question 4

Page 17: Skema Trial Exam

17

1 4(a) 1 Write a suitable inference

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

1 (b) 1 Write a suitable hypothesis

The greater the current, the stronger the magnetic field

10 (c) (i) 1 Write the aim of the experiment

To investigate the relationship between the current and the strength of the magnetic field of an electromagnet.

(ii) 2 State the manipulated variable and responding variable

Manipulated variable : current, I

Responding variable : number of paper clips, N

3 State the fixed variable

The number of turns of the coil

(iii) 4 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.

(iv) 5 Draw a functional diagram of the apparatus

(v) 6 State how the manipulated variable is controlled

The current was switched on.

The rheostat was adjusted to obtain a current of 0.5 A

7 State how the responding variable is measured

The number of paper clips, N attracted to the soft iron rod was counted

8 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

(vi) 9 State how the data is tabulated

Current, I / A Number of paper clips attracted, N

0.5

1.0

1.5

2.0

2.5

3.0

10 State how the data is analysed

A graph of N against I is drawn

12