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Physics

Paper 2

OCTOBER

2007

2 hours

NAME : .............................................. CLASS: ............................................

PEPERIKSAAN SELARAS AKHIR TAHUN

TINGKATAN EMPAT MATA PELAJARAN SAINS DAN ATEMATIK

SEKOLAH-SEKOLAH MENENGAH NEGERI MELAKAKelolaan:

PEJABAT PELAJARAN DAERAH

MELAKA TENGAH*ALOR GAJAH*JASIN

Dengan Kerjasama

JABATAN PELAJARAN MELAKA

JALAN ISTANA ,BUKIT BERUANG,MELAKA

2007

PHYSICSPaper 2

Two hours and thirty minutes

Do not open this questian paper until you are told to do so.

1 This question paper consists of three

Section QuestionFull

MarksMarks

1 4

2 5

3 6

4 7

5 8

6 8

7 10

A

8 12

9 20B

10 20

11 20C

12 20

Total

sections : Section A, Section B and

Section C.2. Answer all questions in SectionA..Write

your answers for Section A in the

spaces provided in the question paper.3 Answer one question from Section B

and one question from Section C.Answers questions in Section B and

Section C in detail. You may use

equations, diagrams, tables, graphsand other suitable methods to explain

your answer.

4. Show your working.It may help you toget marks

5. The diagrams in the questions are not

drawn to scale unless stated.

6. Marks allocated for each or part of the

question are shown in brackets.7. You may use a non-programmable

scientific calculator.

This question paper consist of 19 printed pages

4531/2 [Lihat sebelah]

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STUDENTS INFORMATIONS

1. This paper consists of three sections:Section A, Section Band SectionC.Answers all the questions in section A in the space provided below

the question.

2. Choose each question from Section Band Section C. Your answersmust be written on foolscap paper. In this section you are advised to

answer in detail with the help of the diagram or table.

3. The diagrams in this question paper are not drawn in exact scale.4. Marks allocated for each question or part of the question are shown in

brackets.

5. Draw a straight line if you wish to cancel any part of the answers.6. Group of formulae is given and might be important for you to solve

some questions related to the topic.

7. You are allowed to use scientific calculator. Anyhow the steps ofcalculation must be shown.

8. You might need 90 minutes to answer questions in Section A, 30minutes for Section B andSection C.

9. Hand out all your answers in one group. Remember to write down youparticulars in every foolscap papers.


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The formulae given below might be helpful to you.

1. a=t

uv

2. v2

= u2

+ 2as

3. s = ut +2

1at

2

4. Momentum = mv

5. F = ma

6. kinetic energy =2

1mv

2

7. Potential energy = mgh

8. =V

m

9. Heat , Q = mc

10.T

PV= constant

11. E = mc2

12. v = f

13. Power =time

Energy

14.f

1=

u

1+

v

1

15. =D

ax

16. n =r

i

sin

sin

17. Q = It

18. g= 10 ms-2

19 P = gh

20 F = kx


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Section A

[ 60 marks]

Answerall questions in this section.

Measuring

cylinder

DIAGRAM 1

Diagram 1 shows an observers eye at four different positions P, Q, RandS. The observer is

taking a reading on the scale of a measuring cylinder.

1 b (i)

1 b.(ii)

1 c

1 (a)

(a) Name the physical quantity measured by the observer.

. [1 mark]

(b) (i). On Diagram 1, tick in the box , the correct position of the observers eye whiletaking the reading on the measuring cylinder

[1 mark]

(ii). Give one reason for your answer in (b)(i).

. [1 mark]

(c) What is the smallest division of the scale?

.. [1 mark]

Total


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3. Diagram 3.1 shows the arrangement of apparatus to determine the relationship between the

extension, eof a spring T with weight, W. The relationship ofe with Wis shown on the graphin Diagram 3.2

DIAGRAM 3.1 DIAGRAM 3.2

(a) (i) State Hookes law

3a(i)

3a(ii)

[1 mark]

(ii) Show on the graph the maximum weight whereby the spring will return to itsoriginal length once the weight is removed.

[1 mark]


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(b) The spring stores energy when it is extended. Calculate the energy stored in the springwhen it reaches its elastic limit.

[3 marks]

3(b)

3(c)(c) Another spring with a bigger diameter coil is used to replace the initial spring. The

experiment is then repeated.

Sketch the graph ofe against W for this experiment on the graph in Diagram 3.2.Total

[1 mark]

4. A marble is dropped from the top of a building and takes 2 s to reach the surface of theearth. The motion of this marble is known as free fall.

4(a)

(Gravitational acceleration g is 10 ms-2

).

4c(ii)

a) What is meant by free fall?

...[ 1 mark]

b) State the energy changes experienced by the marble.

...

[1 mark]c) i) What is the height of the building?

[2 marks]ii) Calculate the velocity of the marble immediately before reaching

the surface.

[2 marks]


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d) If the marble with a higher mass is dropped from the same height. Compare thetime taken to reach the surface of the earth.

..

[1 mark]

Total

5. Diagram 5.1 shows a load of 8kg being pulled by a horizontal force of 20 N on a roughsurface. When the load accelerates with an acceleration of2 ms-2, the friction which

acts between the load and the rough surface isf.

DIAGRAM 5.1

5(a)

a) Label the vertical forces that act on the load

[1 mark]

b) Determine the value off.

5(b)

[2 marks]


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c) The load then is being pulled by a force of 20 N along a rough surface as shown in

Diagram 5.2. The direction of the force is 400

to the horizontal. The frictional forceacting on the object is still the same.

DIAGRAM 5.2

(i) State the horizontal component of the force F.

c iii

..

[ 1 mark](ii) State the vertical component of the force F.

.

[ 1 mark]

(iii) Calculate the horizontal net force of the load.

[2 marks]

(iv) Compare the acceleration of the object between Diagram 5.1 and 5.2 .

Total[1 mark]


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6. Diagram 6 shows a hydraulic brake system. When the brake pedal is pressed, thepressure exerted on the brake oil is transmitted equally to the four wheels of a car.

(a)Name the physics principle applied in the above Diagram?

.

[ 1 mark ]

(b)Explain how pressure is produced in the master cylinder.

.

.

[ 2 marks ]

(c) i) If the cross-sectional area of piston A is 25 cm2 and the force given tothe pedal is 800 N. Calculate the pressure in the master cylinder .

[ 3 marks ]

Piston

A

Piston B

DIAGRAM 6

6 b


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Total

6c(ii)

6(d)

7(a)

7 b

7(d)

7(c)

ii) Give one characteristic of the special fluid used in the hydraulic brakesystem.

...

[1 mark]d) Name another application in daily life which uses the principle stated in

6 (a).

...

[1mark]

Diagram 7.1

7. Diagram 7.1 shows the cross section of a submarine of volume 360 m3. When the ballast

tank of the submarine is empty, the submarine floats with two fifth of its volume

above the water level. (Density of sea water = 1100 kgm ).3

(a) State the principle involved in this observation.

.

.[2 marks]

(b) Name the two forces acting on the submarine.

...[2 marks]

(c) On the diagram, mark the direction of the two forces acting on the submarine.

[1 mark]

(d) Explain why the submarine is floating at rest in the water.

..

..

[1 mark]


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(e) Calculate the weight of the submarine when the ballast tank is empty.

[3 marks]

(f) What happens to the submarine if the water is pumped into the ballast tank?

..[1 mark]

8. Diagram 8 shows two identical containers of the same size .The containers are made oftwo different materials.

Each of the containers contains 500 g of water .Two hot objects of the same size areput into the containers. The time and temperature are recorded. Table 8 shows the

time and the temperature recorded for 20 minutes.

( Specific heat capacity of water = 4200 Jkg-1 0

C-1

)

Table 8

Time, t /minTemperature in

container A/0C

Temperature in

container B/0C

0 25.0 25.0

4 27.0 27.0

8 29.0 28.0

12 30.0 27.0

16 30.0 26.0

20 30.0 25.0

Hot

object

Container BContainer A

Hot

object

Total

7(f)

7(e)

lid

DIAGRAM 8


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(a) Based on Table 8 , state the pattern of the temperature change in

(i) container A

8a(ii)

[2 marks](ii) container B

...

..8b(i)[2 marks]

(b) (i) Explain your answer in a(i) and a(ii).

..

..

[2marks]

8(c)

8b(ii) (ii) Name material used to make container A and container B

- container A is made of .

- container B is made of .[2marks]

(c) State one process that causes the heat released.

.......

[1mark](d)( i) Calculate the heat released by the hot object in container A when thermal8d(i)

equilibrium is achieved.

[2 marks](ii) State one important assumption in(d)(i).

...[1mark]

Total


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Section B

[20 marks]

Answerany one question in this section

9. A boy pushes two punching bags, A and B of different masses. The mass of the punching

bag A is 5 kg and the mass of punching bag B is 30 kg. Diagrams 9(a) and 9(b) illustrate thesituations of both punching bags, A and B.

DIAGRAM 9(A) DIAGRAM 9 (B)

a) (i) What is meant by mass? [1 mark ]

(ii) The boy used force to either move or stop the punching bags.He finds that it is more difficult to move and to stop punching bag B compared

to punching bag A .Observe Diagram 9(a) and 9(b), compare the mass of the

punching bags and the difficulty to move or to stop them.Relate the mass of thepunching bags and the resistance to the state of movement of the bags, deduce a

relevant physics concept.

[5marks] (b)

Explain how sauce of tomato from a bottle is forced out easily.[4 marks] (c)

Diagram 9(c) shows a car speeding on a road and Diagram 9(d) shows the car crashed on the

rock. Due to lack of safety features, the driver sustained serious injury.

DIAGRAM 9 (C) DIAGRAM 9 (D)


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The following are few facts concerning the car:

(i) The car stopped suddenly upon hitting the rock.

(ii) The driver was thrown out of the car, breaking the glass of the windscreen.

(iii) Sharp pieces of glass from the shattered windscreen injured the head of the driver.

(iv) The accident occurred at night. The driver did not see the rock until it was verynear.

Based on the above facts, suggest various features to be added to the car to improve its safetystandard and explain how each feature can reduce injury of the driver.

[10 marks ]

10.

Diagram 10

Diagram 10 shows a girl pouring some hot water from a kettle into a cup. The left hand of the

girl in Diagram 10(a) is not scalded by the droplets ofhot water spattered from the cup.Diagram 10(b) shows that her left hand gets scalded when the hot water from the kettle is

accidentally poured onto it.(a) What is meant by heat? [1mark]

(b) Using Diagram 10(a) and 10(b), compare the mass and quantity of heat of the two

situations.

State the relationship between the quantity of heat and the mass of the two objects.Explain why the left hand of the girl in Diagram 10(b) get scalded .

[5 marks]

(c) Water is normally selected as the cooling agent in a car engine. Explain why water isselected. [4 marks]

(d) A researcher wishes to produce an ideal cooking pan which saves gas for the purpose

of cooking, steaming, and baking. Using the appropriate physics concepts, suggest andexplain the modification required. [10 marks]


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Section C

[20 marks]Answerany one questions in this part.

11. An ammeter with zero error is used to measure current .The measurement of the

current is repeated for several times. The current measured is consistent but notaccurate.

a) i). What is meant by measurements are consistent ? [1mark]

ii) Why the current measured are not accurate? [2marks]

iii) A consistent measurement may not be accurate . Please use a diagram

for your explanation.[4marks]

b) Table 11 shows the characteristics of four measuring instruments K,L,Mand N used for a base quantity.

Measuringinstruments

Range ofmeasurement

SensitivitySmallestdivision

of scale

Ability to

measureexternal

diameter

K A few metres Low 0.1cm Cannot

L Less than 2 cm High 0.01mm. Can

M Up to 10 cm Average 0.01cm Can

N Up to 1 metre Low 0.1cm Cannot

Table 11

You are asked to investigate the characteristics of the measuring instruments shown in Table

11 which could be used to measure the thickness of a fishing line. Explain the suitability of thecharacteristics of each instrument in Table 11 and hence, determine which instrument is most

suitable to be used to measure the thickness of a fishing line. Justify your choice

[10marks]

c) You are given a plastic ruler and a few coins. Explain how to determine the

thickness of a coin.[3marks]


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12. Diagram 12.1 shows the same wooden block floats in liquid with different density

X, Y and Z . The cross- sectional area for wooden block is 0.02 m2.

Diagram 12.1

ZYX

a) (i ) Define density. [ 1 mark](ii) Why the wooden block is floating? [1 mark]

(iii) Compare the density of X, Y and Z. Explain your answer. [3 marks]


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HIDROMETER P HIDROMETER Q

vacuum

Vacuum

Plastic wallGlass wallGlass bulb with air

diameter 6 cm

Thinner and

Longer stem

Glass bulb with air

diameter 6cm

Thinner and

Longer stem

Lead shots

Thinner and

shorter stem

Thinner and

Shorter stem

HIDROMETER R HIDROMETER S

Aluminum wallPlastic wall

Glass bulb with airdiameter 3 cmGlass bulb with airdiameter 6 cm

Lead shots

Diagram 12.2


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b) Diagram 12.2 shows specifications for hydrometers P, Q, R and S.Based on the Diagram,

i) Explain the suitability of each specification of the hydrometer and determine

which hydrometer is most the suitable instrument tomeasure the density of acid . Justify your choice.

[10 marks]

b) The wooden block is partly submerged in liquid X. as shown in diagram below

[density of liquid X= 800kgm-3

]

Calculate

i) the volume of the liquid displaced [2 marks]ii) the up thrust acting on the wooden block [3 marks]

END OF QUESTION PAPER


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