final exam form4 2011 k2

8/13/2019 Final Exam Form4 2011 k2

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SULIT 4531/2

4531/2 2 [Lihat sebelah]

The following information may be useful. The symbols have their usual meaning.

Maklumat berikut mungkin berfaedah. Simbol-simbol mempunyai makna yang biasa.

1. a = v u 16. Power, P = energyt time

2. v2= u2+ 2 as 17. V = IR

3. s = ut + 1 at2 18. Power, P = IV

2 kuasa

4. Momentum = mv 19. Ns= Vs

Np Vp

5. F = ma 20. Efficiency = IsVsx 100 %

(kecekapan) IpVp

6. Kinetic energy = 1 mv2

(Tenaga kinetik) 2 21. 1 = 1 + 1

f u v

7. Potential energy = mgh 22. n = sin iTenaga keupayaan sin r

8. Elastic potential energy = 1 Fx 23. n = Real depth

(Tenaga keupayaan kenyal) 2 Apparent depth

9. = m 24. = ax

V D

10. Pressure, = hpg. 25. Q= ItTekanan

11. Pressure, = F 26. E = I (R + r)

Tekanan A

27. eV = mv2

12. Heat, Q = mc

Haba 28. g = 10 ms-2

13. PV = Constant (pemalar)

14. E = m c2

15. v = f


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SECTION A

[60 marks]

Answer all questions in this section.

You are advised to spend 90minutes on this section

1. Diagram 1.1 shows athe arrangement of apparatus for the experiment to find out the relationshipbetween area and the rate of evaporation. A petri dish is filled with liquid X and then put on a tripple

beam balance. Diagram 1.2 shows the reading of triple beam balance.

Diagram 1.1

Diagram 1.2

(a) What is physical quantity measured by the triple beam balance?.

[1 mark ]

(b) What is the value of the smallest division on the scale?.

[1 mark ]

(c) Using Diagram 1.2, state the reading shown by triple beam balance..

[1 mark ]


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2. Diagram 2.1 shows Adam is pulling a 50 kg box with tread.

Diagram 2.1

(a) What is the meaning of frictional force?.

[1 mark ]

(b) Adam pull the box with force 500 N and the box moves with acceleration 40.0 m s-2.(i) Calculate the friction force acting on surface.

[2 marks ]

(ii) State one modification that can be done to reduce the friction force on surface...

[1 mark ]

(c) Diagram 2.2 shows an aeroplane flying horizontally with a constant velocity. R and S are two forceswhich maintain the aeroplane at constant altitude.

Diagram 2.2

(i). Name the forces R and S.

R: ..

S: .. [2 marks]

(ii). Write equation to show the relationship between R and S.

.

[1 mark]

(iii) Which of the forces is caused by the Bernoulli's effect?

[1 mark]

Forward trustAir resistance

R

S


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3. Diagram 3 shows an object, O, [placed in front of a type of lens. F is the focal point of the lense]

Diagram 3

(a) What is the meaning of focal point?

[1 mark]

(b) Based on the diagram,(i) Name the lens

[1 mark]

(ii) Draw a ray diagram on Diagram 3.1 to show how the image is formed.[3 marks]

(iii) State one characteristic of the image formed...

[1 mark]

(iv) What happens to the size of image when the focal length of lens is decreased?..

[1 mark]


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4. Diagram 4.1 shows the foothill and mountain peak of Mount Kinabalu, Sabah.

Diagram 4.1

(a) What is meant by atmospheric pressure?..

[1 mark]

(b) Using Diagram 4.1:(i) Compare the altitude between mountain peak and foothill

[1 mark]

(ii) Compare the air pressure at mountain peak and foothill.

[1 mark]

(iii) Based on answer in (b)(i) and (b)(ii), state the relationship between the altitude and the airpressure.

[1 mark]

(c) Diagram 4.2 shows an instrument to measure atmospheric pressure.

Diagram 4.2

(i) Name the instrument shown in Diagram 4.2...

[1 mark]

(ii) On the Diagram 4.2, draw the arrow to show the atmospheric pressure acting. [1 mark](iii) State the value of atmospheric pressure shown on the diagram 4.2

.

[1 mark]

76 cm


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5. Diagram 5.1 and Diagram 5.2 shows a stone hanging from a spring balance in two situations.

Diagram 5.1 Diagram 5.2

(a) What is the meaning of weight?..

[1 mark]

(b) Based on Diagram :(i) What is the difference between the spring balance reading in Diagram 5.1 and Diagram 5.2?

_______________________ N

[1 mark]

(ii) Name the force that is represented by the reading in (b)(i)...

[1 mark](c) Complete the following sentence by underlining the correct words.

The weight of the water displaced is (less than, equal to, more than) the buoyant force acting on the

stone.

[1 mark]

(d) Calculate the volume of water displaced.[Density of water = 1000 kg m

-3, g = 10 m s

-2]

[2 marks]

(e) What happens to the spring balance reading in Diagram 5.2 when the stone is immersed deeper into thewater?.

[1 mark]


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6. Diagram 6.1 shows air bubbles produced by fish.

Diagram 6.1

(a) Explain why the volume of an air bubble increases as it moves towards the surface.

..

[2 marks]

(b) Name the physics law involved in (a)..

[1 mark]

(c) An air bubble of volume 5 cm3is released by a fish at a depth of 0.5 m. Calculate the volume of theair bubble when it reaches the surface of the water.

[ Assume that the atmospheric pressure is 10 m water ]

[2 marks]


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(d) Diagram 6.2 shows the set up of apparatus used to study the relationship between pressure and volumeof air trapped in an air-tight column at constant temperature and mass.

Diagram 6.2

(a) Name the measuring instrument labelled X.

............

[1 mark]

(b) Name the physical quantity measured by instrument labelled X.

....

[1 mark]

(c) What will happen to the volume of air trapped in an air-tight column when the reading of instrument X

increases?

.....

[1 mark]

Instrument X


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7. Diagram 7.1(a) shows a boy skating down a ramp from position X. Diagram 7.1(b) shows the velocity-timegraph of the boy from X to Z.

Diagram 7.1(a) Diagram 7.1(b)

Diagram 7.2(a) shows the same boy skating down from position Y by using another ramp. Diagram 7.2(b) shows

the velocity-time graph of the boy from Y to Z.

Diagram 7.2(a) Diagram 7.2(b)

Both ramps are of the same slope and surface.

(a) Name the physical quantity represented by the gradient of the velocity-time graph.....

[1 mark]

(b) Observe Diagram 7.1(a) and Diagram 7.2(a).(i) Compare the gravitational potential energy of the boy at X and Y.

.

[1 mark]

(ii) Compare the velocity of the boy at Z in these two situations.

[1 mark]


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(iii) Compare the kinetic energy of the boy at Z in these two situations.

.

[1 mark]

(c) Based on the answers in (b),(i) State the relationship between the gravitational potential energy and the kinetic energy of the

boy.

..

[1 mark]

(ii) State the physics concept involved...

[1 mark]

(d) (i) Based on Diagram 7.1(a), what happens to the velocity of the boy when he skates from Z to Q?

..

[1 mark]

(ii) Give one reason for the answer in (d)(i).

..

[1 mark]


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8. Table 8 shows two types of pot and their characteristics.

(a) What is the meaning of specific heat capacity?

[1 mark]

(b) Based on Table 8, state suitable characteristics of the pot if it is to be used for cooking somethingrapidly. Give reason for the suitability of the characteristics.

(i) Material for making the pot.

Reason

...

[2 marks]

(ii) Material for making the handle of the pot..

Reason

..

[2 marks]

(iii) Mass of the pot..

Reason

.[2 marks]


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(c) The pots are heated by using an electric hot plate of power 800 W. Based on the information in theTable 8, calculate the time taken to achieve a temperature rise of 90

oC for:

(i) The clay pot

[2 marks]

(ii) The copper pot

[2 marks]

(d) Determine the most suitable pot that is safest to handle and can be heated in the shortest period oftime.

. [1 mark]


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SECTION B

[20 marks]

Answer any one question from this section

9. Diagram 9.1 shows a boy and his father sitting on two identical beach balls, A and B, respectively.

Their weights are balanced by the buoyant force.

(a) What is the meaning of weight? [1 mark](b) (i) Using Diagram 9.1, compare the weight of the boy and his father, the volume of the water displaced

and the buoyant force acted on both of them. [3 marks]

(ii) State the relationship between the buoyant force and:

(a) The volume of water displaced(b) The weight of water displaced [2 marks]

(iii) Name the physics principle involved. [1 mark]

(c) Diagram 9.2 shows what happens when a wooden block is held above the water surface and thenreleased into the water.

When the wooden block is released, it falls into the water and goes completely under the water surface.

Then it moves upwards and floats on the water surface. [3 marks]

(d) The State Forestry Department is going to organize a raft competition. As a team leader, you arerequired to give some suggestions to design a raft which can accommodate 15 participants and be able

to move quickly is water. Using your knowledge of motion, forces and properties of materials, state and

explain the suggestions, based on the following aspects:

(i) The shape of the raft. [2 marks](ii) The material used for the raft. [2 marks](iii) The size of the raft. [2 marks](iv) The design of the raft. [4 marks]


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10. Diagram 10.1 and 10.2 show two types of metal block of the same mass being heated using similarheaters for 10 minutes. Both metal blocks have the same initial temperatures of 30

oC. The specific heat

capacity of copper is 387 J kg-1 o

C-1

and 900 J kg-1 o

C-1

for aluminium.

Diagram 10.1 Diagram 10.2

(a) The specific heat capacity of copper is 387 J kg-1oC-1?What is meant by the statement above? [1 mark ]

(b) Using Diagram 10.1 and Diagram 10.2, compare the increase in temperature and the specific heatcapacity of the metals used and time of heating.Relating the time of heating, the increase in temperature and the specific heat capacity of the metals to

deduce a relevant physics concept.

[5 marks ]

(c) A substance Mof 0.1 kg mass is heated by a 70 W electrical heater from -20 C. The heating curve isshown in the diagram 10.3.

Diagram 10.3

(i) Based on the above graph, state the physical condition of substance M at BC and CD(i) By using kinetic theory, explain why the temperature of substance Mis constant in BCeven

though heat is still being supplied to it.

[4 marks]

(d) Diagram 10.4 shows food being fried in a wok of cooking oil.

Diagram 10.4

Suggest and explain how the food to be fried can be cooked in a short time based on the following

aspects of the material of the wok and the cooking oil.

Material of the wok

- Specific heat capacity- Mass- Melting pointCooking oil

- Specific heat capacity- Boiling point [10 marks]


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Section C

[ 20 marks]

Answer anyonequestion from this section

The time suggested to complete this section is 30minutes

11.Diagram 11.1 shows a helmet, gloves and jacket worn by bikers of a motorcycle racing tournament.

Diagram 11.1

(a) What is meant by impulsive force? [1 mark]

(b) The biker must wear the helmet, gloves and jacket in race to keep him in safe condition. Explainhow the helmet, gloves and jacket can keep the bikers in safe condition?

[2 marks]

(c) Explain why the biker moved forward and seriously injured when the motorcycle stopped suddenly.[2 marks]

(d) A racing motorcycle of mass 202 kg accelerates from rest to its maximum velocity of 160 km h -1in10 s.

(i) Convert 160 km h-1into SI unit.(ii) Calculate the acceleration of the racing motorcycle.

[ 5 marks]

(e) Table 11 shows four racing motorcycle P, Q, R and S with different specifications. You are requiredto determine the most suitable motorcycle to move fast and safe when racing. Study the

specifications of all the four motorcycle from the following aspects:

- The type of brakes- The width of tyres- Mass of motorcycle- The seat height (measured from the lowest setting of the seat to the ground)Explain the suitability of the aspects.Justify your choice. [10 marks]


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Racing bike A

Type of brake: without ABS

Mass : 205.0 kg

Racing bike B

Type of brake: without ABS

Mass : 220.0 kg

Racing bike C

Type of brake: ABSMass : 208.0 kg

Racing bike D

Type of brake: ABS

(ABS: Antilock Brake

System)

Mass : 242.0 kg

Table 11

Seat height

905 mm

Seat height

1010 mm

Seat height

815 mm

Seat height

1055 mm

Width of the tyre

Width of the tyre

940 mm

Width of the tyre

Width of the tyre


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12.Diagram 12.1 shows a submarine is sea water due to effect of buoyant force.

Diagram 12.1

(a) What is the meaning of buoyant force. [1 mark](b) Explain how a submarine is able to submerge into deep sea water? [4 marks](c) You asked to investigate the characteristic of each backhoes in table 12 and choose a backhoe that

can do heavy works, an example of a backhoe is shown in diagram 12.2.

Diagram 12.2

Explain the suitability of the characteristics each backhoes. Determine the most suitable backhoe.

Give reason for your choice. [10 marks]

Type of backhoe Characteristics

Size of tyre Centre of gravity Fluid used in hydraulic system mass

P Large Large Liquid Large

Q Low Medium Gas Small

R Large Low Liquid Low

S Medium Large Liquid Low

T Large Low Gas Medium

Table 2

(d) The Diagram 12.3 shows a hydraulic system with two pistonsAand B, connected to a tube thatcontains oil. The area of pistonsAand Bis 5 cm

2and 50 cm

2respectively, and a force of 10 N is exerted

on pistonA.

Diagram 12.3

(i) Calculate the pressure that is exerted by pistonAon the oil.(ii) What is the pressure that is exerted by the oil on piston B? Explain your answer. [5 marks]

END OF QUESTIONS

final exam form4 2011 k2

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