Teknik Menjawab Soalan Kertas 2

7/30/2019 Teknik Menjawab Soalan Kertas 2

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ANSWER STRATEGY PHYSICS QUESTIONSPAPER 2

Subjective Questions (2 Hours 30 Minutes)SECTION A Section A of paper 2 consists of 8 questions.You will have to answer all the 8 questionsin this

section. The total in Section A is 60 marks You are advised to spend 90 minuteson thissection. Spending more than 90 minutes on this

section will result in having insufficient time toanswer questions in Sections B and C. Before attempting to answer questions, read thequestions at least twice and highlight the key

wordsprovided so that you will not go out of point.


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Write down all the steps in the spaces providedin the questions paper, including the formula used.

A section that is allocated only 1 mark willrequire a short answer. On the other hand, a

section that is allocated 3 marks will require youto state 3 properties or characteristicassociatedwith the particular section.

Answer all the 8 questions within the 90 minutes

Do not force yourself to answer Questions 1first if you are not too sure of the answers. Answer

questions that you are most sure of first


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SECTION B

Section B consists of two questions. You needto answer only ONE question from this section.

The marks allocated for this section is 20 marks.

You are advised to spend 30 minutes on this sec

The questions from section B are normallypreceded by a diagram that shows a certain stateor situation that is related to a specific Physics

concept. You are normally asked to state thecharacteristics shown in the diagram and also tostate the Physics principles involved.


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SECTION C

Sections C consists oftwo questions. You needto answerONE question only from this section.

The marks allocated for this section is 20 marks.

You are advised to spend 30 minuteson this sectio

The questions from Section C are normally

preceded by a table that is related to a specific Physics

concept,


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The questions in this section normally require you

to state a certain principle or to explain certainproperties or characteristics based on the information

given.

Study the marks allocated to each section or sub-

section in the questions. The marks allocated in eachsection may be as high as 10 marks. In such cases,make sure that you have at least 10 points orproperties related to the section as each point is

normally allocated 1 mark.


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TYPES OF QUESTIONS IN PAPER 2 SPM PHYSICS

Question No.1 - No.4

(Knowledge, Understanding and Application)

Questions No.5, No.6 and No.9/No.10

(Conceptualizing)

Questions No. 7 and No.9/No.10

(Problem Solving)

Questions No. 8 and No.11/No.12(Making Decision)


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Question No.1 - No.4(Knowledge, Understanding and Application)

Understand the tasks

Refer to the marks stated- 1 point for 1 mark

Answer in simple wordsbut meaningful related to p

Use correct terminology


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Calculation:

- Choose & writethe relevant formula- Substitutethe values correctly- Answer with correct unit

Understanding and qualitative application

- explain step by step [imaging the marker doesnot know the physics]


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Example 1 Q21. Diagram 2 shows a watertank that supplies water to a

block of flats. The waterflows to each unit of the flat

due to water pressure.


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(a) What is meant by pressure?

Force per unit area // Force Area // F/A, where;

F is force, A is area[1 mark]

(b) A water tank with a height of 3.0 m is fully filled

with water. Calculate the pressure at the base of

the water tank.[Density of water = 1000 kg m-3]

P= hg= 1000 x 9.8 x 3

= 29400 N m-2 // 2.94 x 104 N m-2 / Pa / kgms-2m-2 / kgm-1s-2

[2 marks]


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(c) Based in Diagrams 2, compare the water

pressure at P and Q. Explain your answer.

Pressure at Q is higher // Pressure at P is lower //

Q > P // Q is higher // Q is more // Q is

bigger // Q is more than P

Depth at Q is higher // Depth at P is lower // hQ >

hP // HQ > HP / Q is deeper // Pressure increases

as the depth increases[2 marks]


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Example 2 Q3A SPM 2007

(a) Name the heat energy, Q1, which is absorbed

from R to S.Latent heat // Specific latent heat (of fusion)

[1 mark](b) State one reason why the temperature at R and

S is the same even though heat is supplied.

The heat needed to break the bonds betweenmolecules // molecules move further apart // to

change solid to liquid // to change physical form

// kinetic energy doesnt change[1 mark]


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(c) Calculate the het energy, Q2, which is

absorbed from S to T.[The specific heat capacity of water, C=4200 J kg-

10C-1]

Q = mc= 1.0 x 4200 x 100

= 420 000 J // 4.2 x 105 J // 420 kJ[2 marks]


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Questions No.5, No.6 and No.9 or No.10(Conceptualizing)

Every items starting with stimulus (situation).

Stimulus or situation can be in diagram, table, chart

Understand the tasks:

- Comparison :State the similarities and differenc

- Differences: State characteristics that are different- Similarities : State the same characteristics

Relationship: directly proportional/ inverselyproportional/ When . increases,

Increases/decreased.

Name the law/principle/concept involved.


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Example 1 Q5A SPM2006

1. Diagram 5.1 shows the situation of a sheet of

paper before and when air is blown.

Diagram 5.2 shows the situation of the canopy before

the lorry moves and when the lorry moves at high

speed.


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(a)What is meant by speed?

The rate of change of distance with time / v=s/t ; s

= distance, t = time[1 mark]

(b) Based in diagram 5.1 and diagram 5.2:

(i) State two similarities for the situation in

Diagram 5.1 and Diagram 5.2.- No air movement, the paper and the canopy will

not lift up/at rest/not moves

- Paper and canopy lift up when the air moves.

[2 marks](ii) Compare the air pressure above and below the

paper when air is blown.

- Air pressure above the paper is lower/air

pressure below is higher [1 mark]


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(iv) Name the principle involved in 5(b)(iii).

Bernoullis[1 mark]

(iii) Relate the speed of the air to the pressure of the

air.High speed, low pressure / inversely proportional

[1 mark]


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Example 1- Q6 SPM 2009

(a) Observe diagram 6.1 and diagram 6.2(i) Compare the depths of the water in region X

and region Y.

X is deeper / bigger / higher / X > Y / Y < X[1 mark]


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(v) Explain why the wave front of sea water will follow


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(v) Explain why the wave front of sea water will followthe shape of the shore when it approaches the

shore.

- The depth of the water decreasing / move in

shallow area

- The velocity is decreasing / wavelength is

decreasing / decreasing- Refraction occurs / bending / change direction

/diagram

[3 marks]

By using a diagram


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Example 2 Q1B SPM 2011

Diagram 9.1 Diagram 9.2

1. Using Diagram 9.1 and Diagram 9.2, compare the thickness,

the focal length and power of the lens. Relate the thickness

of the lens with the focal length to make a deduction

regarding the relationship between thickness of the lens and

the power of lens.

- Lens in diagram 9.1 is thinner- Focal length in diagram 9.1 is longer

- Power of lens in diagram 9.1 is lower

- The thinner the lens the longer the focal length

- The thinner the lens the lower the power [5 marks]


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th d th f i ki th l d d th f


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the depth of sinking, the load and the area of

contact with the sandy beach.

Relate the depth of sinking with the pressure

exerted by the chair to make a deduction onthe relationship between the pressure and the

area of contact in this situation.

- Depth of sinking in 9.1 is deeper than in diagram9.2

- The weight of the man in diagram 9.2 and 9.1 is

equal

- Area contact in diagram 9.2 is larger than 9.1

- The depth of sinking I increases, pressure

increases / d P / h P

- As the area of contact increases, the pressure


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Questions No. 7 and No.9 or No.10(Problem Solving)

Structured Question

1. Very sure of the concept / understand the

working principle of apparatus and its function.

2. Understand the questions / follow theinstructions given.

3. State the methods and reasons / explanations.


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Essay type question:

1. Open type question

1. Understand the problem given2. State the method/suggestion/design/modificationto solve the problems

3. State the explanation for the each method/suggestion/ design

4. Answer in table form for suggestedmodifications. e.g

Modifications

Explanation


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2. Guided type Question

(usually working principle of apparatus)

1. Follow the instruction in the question.

2. Answer can be in the form ofdiagram oressay.

3. State the method/ways and reasons.

Common mistakes:

1. Suggestion of problem solving does not based on

relevant physical concept

2. Give wrong/irrelevant explanation/reason

3. Give redundant/overlap suggestion/method


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Example 5: Q9B SPM 2008

1. Diagram 9.3 shows a pole vaulter performing a jump.

Using appropriate physics concepts, explain the use

of suitable equipment and techniques to improve his

performance.

Your answer should include the following aspects:(i) Vaulters attire

(ii) Vaulters movement

(iii) Pole used

(iv) Safety 10 marks


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E l 2 Q9B SPM 2007


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Example 2 Q9B SPM 2007

2. Diagram 9.6 shows a sailboat.

Your are required to gives some suggestions to

design a sailboat which can travel faster. Using theknowledge on motion, force and the properties of

materials, explain the suggestions based on the

following aspects:

(i) the surface of the board

(ii) the shape of the board

(iii) material used for the board

(iv) material used for the sail

Modifications Explanation


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Modifications Explanation

Smooth // coat with wax1

Reduce (water) friction /

resistance / drag

1

Streamline shape / torpedo /aerodynamic / sharp end /

diagram

Rej: oval

1

Reduce water friction / drag

/ resistance

1

Low density // strongmaterial // tough // Fiber

glass // carbon composite

Rej:Hard/Rubber/Glass/Fiber/Co

mposite

1

Easy to float // Not easy to

break // Slides faster //

Increases the speed // Light

// With stand // Small mass

1

Water proof // Low density

material // Nylon // Tough //Stron // Canvas // S nthetic

1

To avoid the sail absorbed

water // becomes heavier //

Not easy to tear off // Small

mass // Lighter // Can

1


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Example 3: Q9B SPM 2006

3. You are given two convex lenses, P and Q, with

focal lengths 40 cm and 5 cm respectively. Both

the lenses are used to build a simple astronomical

telescope at normal adjustment.

Using the two lenses, explain how you are going

to build the simple astronomical telescope. [6 marks]


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(ii) Suggest modification that needs to be done on the

telescope to produce clearer and bigger images.[4 marks]

- Increases the diameter of the objective lens 1

- More light enter the lens 1

- Increases the focal length 1- Increase the magnification 1


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Questions No. 8 and No.11/No.12(Making Decision)

Structured:1. Guided decision making

2. Follow the instructions in the questions

3. Justify your answer with reasons

e

o

f

f


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Example 1 Q8 SPM 20091. An eye piece of focal length, fe = 5 cm, and an

objective lens are used to build a simple

atronomical telescope. The objective lens is chosefrom Table 1.

Lens Focal length

of lens, f0

(cm)

Diameter of the

objective lens

(cm)

P 10 2 2.5

Q 10 2 5.0

R 40 8 2.5

S 40 8 5.0

Magnificatio

n M =

F0 / F e(cm)


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(i) Complete table 1 by writing down the value of m

for every lens.

2, 2, 8, 8[2 marks](ii) Choose the two lenses that produce the largest

image.

R, S[1 mark]

(iii) Give one reason for the answer in (ii)

Largest/Big/Bigger magnification[1 mark]

(iv) Chose the two lenses that produce the brightest

image

Q, S[1 mark]


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(vi) Based on the answer in (ii) and (iv), choose the

most suitable lens as the objective lens.

S[1 mark]

(v) Give one reason for the answer in (iv)

Largest diameter[1 marks]


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Essay:To answer this question explain the suitability of

each characteristics and determine the most

suitable . ., identify 4 different characteristicsfrom the given diagrams or table.

The answer in a table form.

Characteristic Reason

[ ] is chosen. Reason : It

has ...


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Example Q11C SPM 2008

1. Diagram 11.1 shows a light signal travelling

through an optical fibre made of glass.

(a) The optical fibre in Diagram above can be

used in telecommunications and medicine. You

are asked to investigate the characteristics of

optical fibres for use in these fields as shown in

Table 11.


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Explain the suitability of each feature of optical fibre in Table


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Explain the suitability of each feature of optical fibre in Table11 for use in telecommunications and medicine. Determinethe most suitable optical fibre that is capable of carrying the

largest number of signals simultaneously.

Give reasons for your choice.[10 marks]

Characteristics Explanation

Use a bundle of fine parallel

optical fibre 1

Can receive more information 1

Choose 1 > 2 1 Total internal reflection can occur

1

Must be high flexibility 1 So that it can follow the curve path

1

Purity of inner core must be veryhigh 1

So that the signal can travelwithout losing information //

information easy to send 1

R is choose 1

Because it use a bundle of fine parallel optical fibre, 1 > 2 , high

flexibility and very high purity of inner core 1


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Characteristics ExplanationCoil 1 High resistance / more

heat 1

Thin 1 More resistance / more

heat 1

Tungsten 1 High melting point / High

resistance / Not melt

easily 1

Low pressure 1 The bulb will not burst /

explode / brake 1

R1

(b) Diagram 12.3 shows an energy saving bulb.


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( ) g gy gWhen it is connected to a 240 V power supply, the

bulb produces 10 joules per second of light

energy.Calculate

(i) the current flows through thebulb

(ii) the heat energy lost in 1

second from the bulb

(iii) the efficiency of the bulb

[5 marks ](i) 11/240 1

0.046 A / 0.05 A1

(ii) 11-10 = 1 J 1

(iii) [10/11] x 1001

90.91 / 90.909 / 90.9090

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