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Physics Perfect Score_SBP_ 2010 1 BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH SEKOLAH KLUSTER KEMENTERIAN PELAJARAN MALAYSIA PERFECT SCORE MODULE SEKOLAH BERASRAMA PENUH 2010 PHYSICS NAME : ……………………...…………………….. CLASS / SCHOOL : …………………...………………………..

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  • Physics Perfect Score_SBP_ 2010 1

    BAHAGIAN PENGURUSAN

    SEKOLAH BERASRAMA PENUH SEKOLAH KLUSTER

    KEMENTERIAN PELAJARAN MALAYSIA

    PERFECT SCORE MODULE

    SEKOLAH BERASRAMA PENUH

    2010

    PHYSICS

    NAME : .....

    CLASS / SCHOOL : .....

  • Physics Perfect Score_SBP_ 2010 2

    Guidelines on how to carry out the PERFECT SCORE Workshop :

    1. The workshop is divided into six slots of two hours each. It is suggested that one section to be

    discussed in each slot. (Please refer to the table below)

    2. Suggested activity for each slot:

    Briefing by facilitator 10 minutes

    Discussion Session 20 30 minutes

    Presentation by group 70 - 80 minutes

    Conclusion 10 minutes

    Total 120 minutes (2 hours)

    3. Materials and equipments needed for this workshop :

    Perfect Score Module (6 sections - Section I VI)

    Transparency / A4 paper/test pad

    permanent and whiteboard marker pen

    overhead projector

    whiteboard

    PHYSICS PERFECT SCORE 2010 PANELS

    PN NOR SAIDAH BT CHE HASSAN (SBPI Gombak)

    PN JAMILAH BT YUSOF (SSP)

    PN HASLINA BT ISMAIL (SMS Hulu Selangor)

    PN KAMARIAH BT MOHD ARSYAD (MCKK)

    PN NIK SERI RAHAYU BT NIK ARIFF (SMS Hulu Selangor)

    PN FUZIAH BT AHMAD (SMAP Labu)

  • Physics Perfect Score_SBP_ 2010 3

    CONTENTS

    SLOT SECTION CONSTRUCT TYPE OF QUESTION

    IN SPM 4531 Page

    1 I CONCEPTUALISING

    Paper 2 Section A

    (Question 5 / Question 6)

    Paper 2 Section B

    (Question 9 / Question 10)

    2 II PROBLEM SOLVING

    (QUALITATIVE)

    Paper 2 Section A

    (Question 7)

    Paper 2 Section B

    (Question 9 / Question10)

    3 III DECISION MAKING

    Paper 2 Section A

    (Question 8)

    Paper 2 Section A

    (Question 8)

    Paper 2 Section C

    (Question 11 / Question12)

    4 IV UNDERSTANDING

    Paper 2

    Section B

    (Q uestion 9 / Question 10)

    Section C

    (Question 11 / Question 12)

    5 V PROBLEM SOLVING

    (QUANTITATIVE)

    Paper 2

    Section C

    (Question 11 / Question 12)

    DESIGN EXPERIMENT

    Paper 3

    Section B (Question 3 /

    Question 4)

  • Physics Perfect Score_SBP_ 2010 4

    SECTION 1 CONCEPTUALISATION

    (Paper 2 Section A: Question 5/6; Section B Question 9/10 )

    Question 1 [ Forces and Motion]

    Diagram 5.1 and Diagram 5.2 show two coconut trees, one by the roadside and the other by the

    beach. A coconut falls from the same height from each tree.

    Diagram 5.1 Diagram 5.2

    (a) (i) Name one force that is acting on the coconut during the fall. [1 mark]

    (ii) Name the type of motion of the coconut when it drops from the tree [1 mark]

    (b) Based on Diagram 5.1 and Diagram 5.2, compare

    (i) the force on the coconut that landed on the road and that landed on the beach. [1 mark]

    (ii) the change in momentum. [1mark]

    (iii) the time of impact of the coconuts on the road and on the beach [1 mark]

    (c) Based on your answers in (b) (i) and (b) (iii), state the relationship between the force produced in a collision and the time of impact

    [1 mark]

    (d) Name the force that results from a collision as shown in both diagrams. [1 mark]

    Question 2 [ Forces and Pressure ]

    Diagram 5.1 shows a load placed on an ice block. Diagram 5.2 shows an ice floating without the load.

    (a) Explain why ice block float in water? [1 mark]

    (b) What are the force acting on the ice block? [1 mark]

    Coconut cracks

    Coconut intact

  • Physics Perfect Score_SBP_ 2010 5

    (c) Based on Diagram 5.1 and Diagram 5.2,

    (i) Compare the volume of water displaced [1 mark]

    (ii) Compare the weight of water displaced [1 mark]

    (iii) Compare the buoyant force [1 mark]

    (iv) State the relationship between buoyant force and the weight of water displaced [1 mark]

    (v) Name the physics principle involved? [1 mark]

    Question 3 [ Force and Pressure]

    Diagram 9.1 shows a man walking bare foot along a reflexology path. The path is made of cement set with smooth stones and large pebbles. Walking along this path is said to improve circulation of blood in the body. Diagram 9.2 shows the same man walking along the path. He is now wearing shoes.

    (a) Using Diagram 9.1 and Diagram 9.2, compare

    (i) the contact area for the mans feet and the type of surface

    (ii) the pain or discomfort felt by the man

    (iii) Relate the contact area between the man and the type of surface with the pain or discomfort felt by the man to deduce a relevant physics concept

    [4 marks]

    (b) Define the physical quantity that explains the situation above and state its unit [2 mark]

    Load

    Diagram 5.1 Diagram 5.2

    Ice block

  • Physics Perfect Score_SBP_ 2010 6

    Question 4 [ Heat]

    Diagram 5.1 and Diagram 5.2 show two types of metal blocks, P and Q being heated by 50 W immersion heater for 5 minutes..Table 5 shows information related to two metal blocks P and Q.

    Diagram 5.1 Diagram 5.2

    Metal block Mass/ kg Specific heat capacity / Jkg-1

    C -1

    Heat energy supplied / J

    P 1.0 875 658

    Q 1.0 103 1740

    Table 5 (a) What is meant by specific heat capacity? [1 mark]

    (b) Calculate the rise in temperature for

    (i) metal block P [1 mark]

    (ii) metal block Q [1mark]

    (c) Based on your answers in 5(b), compare the rise in temperature for metal block P and metal block Q.

    [1 mark]

    (d) Based on the information in Table 5, [1 mark]

    (i) compare the specific heat capacity of metal block P and metal block Q [1 mark]

    (ii) relate the rise in temperature to the specific heat capacity of the metal block. [1mark]

    (e) In this experiment, the temperature is recorded when the reading on the thermometer has achieved a constant value. State the reason why

    [1mark]

    Question 5 [ Waves]

    Diagram 5.1 and 5.2 show a SONAR wave is sent by transmitter at the lower part of the boat and the echoes are detected by hydrophone. Diagram 5.3 and 5.4 show the trace on the screen of oscilloscope.

    To 12 V power supply

    Thermometer

    Metal block P Metal block Q Felt

    Thermometer

  • Physics Perfect Score_SBP_ 2010 7

    Diagram 5.3 Diagram 5.4 (a) What is meant by wavelenght? [1 mark]

    (b) Sound waves with frequency of 5.8 x 105 Hz are used to determine the depth of the

    sea. The speed of sound waves in sea water is 1250 ms-1

    . The time-base of the oscilloscope is adjusted at 50 ms cm

    -1. Calculate the depth of the sea.

    (Remark: Problem solving Quantitative)

    [2 marks]

    (c) Observe diagram 5.3 and 5.4, [1 mark]

    (i) compare between amplitude of transmited waves and reflected waves [1 mark]

    (ii) explain your answer in (c) (i) [1 mark]

    (iii) compare the amplitude of reflected waves in diagram 5.3 and diagram 5.4 [1 mark]

    (iv) explain your answer in (c) (iii) [1 mark]

    Question 6 [ Electricity]

    Diagram 5.1 shows an electric circuit. Voltmeter V1 , V2 and V3 have high resistance. Ammeter A1,

    A2 and A3 and battery have small internal resistance that can be neglected. Bulb M1 ,M2 and M3 have

    same resistance.

    Diagram 5.1 Diagram 5.2

  • Physics Perfect Score_SBP_ 2010 8

    Diagram 5.1

    (a) Based on diagram 5.1, compare the readings of ammeter A1 and ammeter A3 , when the switch S1 is on and switch S2 is off.

    [1 mark]

    (b) When switch S1 and switch S2 are on,

    (i) Compare the brightness of bulb M1 and M2 [1 mark]

    (ii) Compare the readings of voltmeter V1 and voltmeter V2 [1 mark]

    (iii) Write down the equation to relate the readings of voltmeter V1 , V2 and V3 [1 mark]

    (iv) Write down the equation to relate the readings of ammeter A1, A2 and A3 [1 mark]

    (c) (i) By referring to (a) state the type of circuit connection for the bulb if only bulbs M1 and M3 light up.

    [1 mark]

    (ii) Is the circuit connection above suitable to be used in a domestic wiring system? Give a reason for your answer

    [1 mark]

    Question 7 [ Electromagnetics]

    Diagram 6.1 shows a bar magnet with north pole at point P and Diagram 6.2 shows a bar magnet with

    south pole at point Q which is moved towards the solenoid to produce induced current.

    DIAGRAM 6.1 DIAGRAM 6.2

    Switch S1

    Switch S2

    M1

    M2

    M3

    A3

    V23

    A2

    V1

    A1

    V3

    Zero centre

    galvanometer

    Zero centre galvanometer

    Coil A Coil B

    Bar magnet Bar magnet

    String String

  • Physics Perfect Score_SBP_ 2010 9

    (a) Observe the diagrams and state two differences between them [2 marks]

    (b) What is the polarity exerted at point P and Q when the magnet is moved towards the solenoid?

    [2 marks]

    (c) What is the relationship between the number of turns and the magnitude of induced current?

    [1 mark]

    (d) Name the law involved in (c). [1 mark]

    (e) Suggest another method to increase the deflection of the pointer. [1 mark]

    (f) State an instrument that uses the application of induced current [1 mark]

    Question 8 [ Light]

    Diagram 9.1 and Diagram 9.2 show two rectangular glass blocks with different optical density and refractive index. Ray of light is directed toward the glass blocks with the same angle of incidence 30.

    Density = 2600 kgm

    -3 Density = 2670 kgm

    -3

    Diagram 9.1 Diagram 9.2 Based on Diagram 9.1 and Diagram 9.2,

    (i) compare the densities of the glass blocks [1 mark]

    (ii) compare the refractive index of the glass blocks [1 mark]

    (iii) compare the angle of refraction of the glass blocks [1 mark]

    (iv) relate the angle of refraction, r and the density of the glass blocks [1 mark]

    (v) relate the angle of refraction, r and the refractive index of the glass blocks

    [1 mark]

    Question 9 [ Waves]

    Diagram 9 shows the side view of water wave propagating from a shallow area to a deep area. The frequency of the water waves is 12 Hz.

    Diagram 9

    100 cm

    shallow area deep area

    200 cm

  • Physics Perfect Score_SBP_ 2010 10

    Based on Diagram 9

    (a) (i) compare the wavelength of the water waves in the shallow area and deep area [1 mark]

    (ii) state the relationship between the depth and the wavelength of water waves [1 mark]

    (b) Calculate the velocity of water waves in

    the shallow area

    the deep area [3 marks]

    (c) Based on your answers in 6(b), state the relationship between the depth and the velocity of water waves

    [1 mark]

    (d) Based on Diagram 6, explain why the amplitude of water waves in the deep area is smaller than the shallow area

    [1 mark]

    Question 10 [ Electromagnetics]

    Diagram 10.1 and Diagram 10.2 show a copper wire carrying current is placed in a permanent magnetic field. The magnetic field produced is called catapult field.

    Diagram 10.1 Diagram 10.2 Based on Diagram 10

    (a) What is meant by catapult field ? [1 mark]

    (b) Using Diagram 10.1 and Diagram 10.2, compare the number of magnet used, the angle of deflection of the copper wire and the angle of deflection of ammeter indicator.

    [3 marks]

    (c) State the relationship between the strength of the catapult field produced and

    (i) number of magnet used

    (ii) angle of deflection of copper wire [2 marks]

  • Physics Perfect Score_SBP_ 2010 11

    Question 11 [ Electricity]

    Diagram 10.1 (a) and Diagram 10.2 (a) show two circuits used to investigate the relationship between

    potential difference and electric current.

    Diagram 10.1(b) and Diagram 10.2(b) show the potential difference against electric current graph

    respectively for Diagram 10.1(a) and Diagram 10.2(b).

    (a) What is meant by potential difference? [ 1 mark ]

    (b) Compare the placement of the voltmeter in Figure 10.1(a) and Figure 10.2(a). Then compare the relationship between potential difference and current for both graphs. Explain the results shown in both graphs. Hence state the related physics law and concepts applicable in each situation

    [ 5 marks]

    Question 12 [ Electricity]

    Diagram 9.1 shows an electric kettle use to boil water with a heating element. The heating coil that

    lies within the heating element (as shown in Diagram 9.2 and in Diagram 9.3) heats up when a

    current passes through. Two kettles P and Q with different heating coils inside the heating element

    are used to boil 1 liter of water.The material of both coils are the same.

    Diagram 10.1(a) Diagram 10.1(b)

    I

    V

    0

    0

    V

    V I

    V

    0

    0

    Diagram 10.2(a)

    Diagram 10.2(b)

    Electic kettle

    Heating element

    Plug

    Diagram 9.1

  • Physics Perfect Score_SBP_ 2010 12

    Kettle Length of the coil Thickness of the coil Time to boil I liter water

    P 50 cm 16 mm2 ( Diagram 9.2) 10 minutes

    Q 50 cm 4 mm2 ( Diagram 9.3) 4minutes

    Table 9.4

    (a) What is meant by current ?

    [ 1 mark ]

    (b) Observe Diagram 9.2, 9.3 and Table 9.4. Compare the length and thickness of heating element and time taken to boil the water for kettle P and Q. Relate the thickness of the coil with the resistance and heat produce by the coil to boil the water

    [ 5 marks]

    Question 13 [ Electronics]

    Diagram 10.1 shows the output of a transformer connected to a semiconductor diode and a resistor R Diagram 10.2 shows the output of a transformer connected to four semiconductor diodes and a resistor R

    Diagram 9.2

    Diagram 9.3

    Heating element

    Heating coil

  • Physics Perfect Score_SBP_ 2010 13

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

    (b) Based on diagram 10.1 and 10.2 compare the type of input current, current produced by the output of the transformer and the current that flows through R .Draw the wave forms when R is connected to CRO. Name the process involved

    [ 5 marks]

    Question 14 [ Radioactivity]

    Diagram 10.1 and Diagram 10.2 show the activities of two radioactive sources P and Q.

    Radioactive source P Radioactive source Q

    DIAGRAM 10.1 DIAGRAM 10.2

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

    (b) Based on Diagram 10.1 and Diagram 10.2

    (i) State common characteristic of

    - the shape of the graph

    - the time taken for the activities of radioactive sources P and Q to become half of its initial value

    [4 marks]

    (ii) determine the time taken for the activity of radioactive sources P and Q to become half of its initial value

    [2 marks]

    (iii) Give a name of the physical quantity for the activity of a radioactive source to become half of its initial value

    [1 mark ]

    Time / h

    Masa / j

    0 5 10 15 20

    300

    600

    900

    1200

    Activity / s1

    Aktiviti/ s1

    Time / s

    Masa / s

    0 100 200 300 400

    500

    1000

    1500

    2000

    Activity / s1

    Aktiviti/ s1

  • Physics Perfect Score_SBP_ 2010 14

    SECTION 2 PROBLEM SOLVING - QUALITATIVE

    (Paper 2 Section A: Question 7; Section B Question 9/10 )

    Question 1 [ Forces and Motion]

    Diagram 1 shows a roller skate track. Diagram You are required to give some suggestions to improve the design of the roller skate track. Using appropriate physics concept, explain the design of the roller skate track so that it can be used to oscillate skate board continuously. Your answer should include the following aspects: (i) Shape of the track (ii) Slope of the track (iii) Surface of the track (iv) Safety.

    [10 marks]

    Question 2 [ Forces and Pressure]

    Diagram 2 show the side view of models of a dam. Diagram 2 Explain the modifications that need to be made to the dam to enable it to store more water safely and can be used to produce electricity Your answer should include the following aspects: (i) structure of the wall (ii) strength of material used (iii) system to produce electricity and other relevant aspects

    [10 marks]

    Dam

    Water

  • Physics Perfect Score_SBP_ 2010 15

    Question 3 [HEAT] Diagram 3 shows a jug filled with ice cubes. Diagram 3 If it is left to stand at room temperature, the ice will melt fast. Using the suitable physics concepts, suggest modifications that can be made to the ice container so that ice cubes will not melt easily when the container is placed at room temperature. It is also can be used for a longer time and easy to handle. Your answer should include the following aspects: (i) structure of the container (ii) characteristics of material used [10 marks] Question 4 [LIGHT]

    Diagram4 shows a fibre optic.

    Diagram 4 You are required to give suggestions to design a fibre optics which can works efficiently. Using your knowledge on light, and the properties of material, explain (i) the refractive index of outer and inner layer (ii) flexibility (iii) strength (iv) thickness (v) density of the glass

    [10 marks]

  • Physics Perfect Score_SBP_ 2010 16

    Question 5 [LIGHT] Diagram 5 shows a compound microscope.

    Diagram 5

    Using an appropriate physics concept, suggest and explain suitable modifications or ways to enable the microscope to increase its efficiency and to form a brighter and clear image. Your modifications can be emphasized on the following aspects; (i) The selection of lens as objective lens and as an eyepiece (ii) The position of the object (iii) The position of the eye piece (iv) The distance between the objective lens and eyepiece (v) Condition of the place to store the microscope

    [10 marks] Question 6 [WAVES] Diagram 6 shows the new hall in a school. A musical concert will be held at the hall in a few months time. Study Diagram 9 carefully, there are some improvements can be made to enhance the sound effect.

    Diagram 6

    Using appropriate physics concepts, explain the use of suitable equipment and furnishings to improve the sound effect of the concert. Your answer should include the following aspects:

    (i) Distance between of two stereo speakers (ii) Positioning of speakers and microphones (iii) Furnishings of the hall and other aspects

    [10 marks]

    Speaker

    Microphones

    Stage

  • Physics Perfect Score_SBP_ 2010 17

    Question 7 [ELECTRICITY] Diagram 7 shows the lamps in a domestic lightning circuit are connected in parallel.

    Diagram 7 The circuit is not complete and not efficient for electrical energy consuming and less safety. Suggest modifications that need to be done to the circuit to improve safety, produce the lamps lights up with normal brightness and to increases the efficiency of electrical energy consuming.

    [10 marks] Question 8 [ELECTRICITY] Diagram 8 shows the condition in a closed room with unsuitable installation of lamp.

    Diagram 8 Using appropriate physics concepts, explain suitable modification to the room and the lamp so that the room condition becomes brighter and more comfortable. Your answer should include the following aspects (i) type of the lamp (ii) position of the lamp (iii) the energy efficiency of the lamp (iv) safety feature of the lamp (v) wiring system for the lamp

    [10 marks]

    To

    another

    lamps

    Live

    Neutral

    EarthMeter

    240 V metal

    lamp fitting

    120 V room

    lamp

    220 V dinning

    room

    Consumer unit

    (Fuse box)

  • Physics Perfect Score_SBP_ 2010 18

    Wire carrying electrical audio signal Dawai membawa isyarat elektrik audio

    Question 9 [ELECTROMAGNETISM] Diagram 9 shows an electric bell.

    Diagram 9 The electric bell is found to be unable to hit the gong continuously. Suggest and explain the modifications that need to be done on the electric bell to increase its efficiency. Your answer should include the following aspects (i) shape of the core (ii) number of turn of coil (iii) material used for the core (iv) Additional material

    [10 marks] Question 10 [ELECTROMAGNETISM] Diagram 10 shows a cross section of a moving coil microphone. A microphone converts one form of energy into another .

    Diagram 10

    When the diaphragm moves in response to sound, the attached coil moves in the magnetic field and generates a very small current in the wire of the coil. Using an appropriate concept in physics, suggest and explain suitable modifications or ways to enable the microphone to detect sound effectively and generate bigger current based on the following aspect: (i) thickness of diaphragm (ii) strength of the material for diaphragm (iii) number of turns of coil (iv) diameter of the wire of coil (v) strength of magnet

    [10 marks]

  • Physics Perfect Score_SBP_ 2010 19

    Question 11 [ELECTROMAGNETISM] Diagram 11 shows the parts of a moving coil ammeter.

    Diagram 11

    The moving coil galvanometer is found to be unable to detect small changes of induced current. Suggest and explain the modifications that need to be done on the galvanometer to increase its sensitivity.

    [10 marks] Question 12 [ELECTROMAGNETISM] Diagram 12 shows an a.c. generator.

    Diagram 12 Suggest modification that needs to be done on the generator and the external circuit to enable the generator to be a d.c. generator and produce more current.

    [10 marks]

  • Physics Perfect Score_SBP_ 2010 20

    Question13 [ELECTRONIC] Diagram 13 shows a shadow is formed on fluorescent screen of the Maltase cross tube.

    Diagram 13

    Maltase cross tube in Diagram 16 is not suitable for measuring the frequency of the sound waves. Suggest modifications that can be made to the Maltase cross tube in Diagram 16 to transform it into Cathode Ray Oscilloscope that can measure the frequency of the sound waves. In your suggestions, state the components that are used and their functions based on the following aspects: (i) the electron gun (ii) the deflection system

    [10 marks]

    Question 14 [ELECTRONIC] Diagram 14 shows an electric circuit that has a transistor that acts as an automatic switch. Diagram 14 The circuit in Diagram 14 is found to switch on the fan when temperature is low. You are asked to invent an automatic switching circuit to control an 240V air conditioner. Suggest modifications that need to be done towards the circuit so that it can be used as an automatic switch that will switch on the air conditioner during hot wheater and switch off during cold wheater.

    [10 marks]

    R1

    RB

    Thermistor

    Fan

    6V

  • Physics Perfect Score_SBP_ 2010 21

    Question 15 [Electronics]

    (a) Complete the truth table for logic gates P, Q, R and S.

    [1 mark ]

    [ 1 mark]

    [ 1 mark ]

    [ 1 mark ]

    (b) Diagram 15.1 shows the combination of two logic gates S.

    Combination of two logic gates above will produce single logic gate N.

    Input Output

    A B X

    0 0

    0 1

    1 0

    1 1

    Input Output

    A B X

    0 0

    0 1

    1 0

    1 1

    Input Output

    A B X

    0 0

    0 1

    1 0

    1 1

    Input Output

    A B X

    0 0

    0 1

    1 0

    1 1

    P

    A

    B

    X

    Q

    A

    B

    X

    R

    A

    B

    X

    S

    A

    B

    X

    (i)

    (ii)

    (iii)

    (iv)

    S S

    K L

    M

    Diagram 15.1

  • Physics Perfect Score_SBP_ 2010 22

    (i) Complete the truth table in table 15.2 for the combination of logic gates in diagram 15.1.

    K L M

    0 0

    0 1

    1 0

    1 1

    [1 mark]

    (ii) Name logic gate N.

    (c) Draw the combination of two logic gates Q to produce a logic gate OR. [1 mark]

    (d) Arrange the logic gates P, Q and R inside the box provided in diagram 15.3 so that the

    output produce is the same as the output in the truth table in 15.4

    [ 3 marks ]

    Question 16 [RADIOACTIVITY] Your school has been selected to be one of Research and Development Centre for radioactive. Give some suggestions to modify your school lab with well equip which can be used to do the research work for radioactive source safely. Using your knowledge on radioactive and properties of materials, explain the suggestion based on the following aspects: (i) keeping radioactive source (ii) management of radioactive solid waste (iii) handling radioactive source (iv) warning during leakage (v) exposure detector

    [10 marks] Question 17 [RADIOACTIVITY] As a researcher , you are assigned to investigate the characteristics of a certain radioactive isotope that could be used to detect the thickness of paper in a paper factory. Your answer should include the following aspects (i) The state of matter of the radioactive isotope (ii) The type of radiation emitted (iii) The half-life of the radioactive isotope (iv) The penetrating power of the radioactive isotope (v) Suitable detectors of radioactive emissions

    [10 marks]

    Input Output

    A B X

    0 0 1

    0 1 0

    1 0 0

    1 1 1

    P X

    Q

    A

    B

    R

    Table 15.4

    Table 15.2

    Diagram 15.3

  • Physics Perfect Score_SBP_ 2010 23

    Question 18 [RADIOACTIVITY] Diagram 18 shows an underground water pipe which has a leak.

    DIAGRAM 18.3 Diagram 20 Radioactive substances are hazardous and must be used with care. In using a radioactive substance to detect the leakage, suggest how the substance should be chosen by considering the following aspects: (i) the half life and state of matter of the substance, (ii) the types of radiation emitted by the substance, (iii) The penetrating power of the radiation emitted by the substance (iv) the type of detector to be used.

    [10 marks]

    Location of leakage Water pipe

    1 m

  • Physics Perfect Score_SBP_ 2010 24

    SECTION 3 DECISION MAKING SKILL

    (Paper 2 Section A: Question 8; Section C: Question 11/12 )

    Question 1 [Introduction to Physics]

    As an engineer, you are assigned to investigate the characteristics of several instruments that could

    be used to measure the length and width of 25 cm X 40 cm metal block.

    Table 1 shows the characteristics of five types of measuring instruments P, Q, R, S and T. Study the

    characteristics of all five instruments and decide which is the most suitable instrument to be used to

    measure the length of the metal block

    Justify your choice.

    Measuring

    instrument

    Smallest

    scale / cm

    Range of

    measurement / cm Zero error / cm

    Shape of the

    instrument

    P 0.5 0 100 0.2 Flat and thin

    Q 0.1 0 50 0.1 Roll and thin

    R 0.1 0 50 0.0 Flat and thin

    S 0.1 0 50 0.1 Flat and thin

    T 1.0 0 100 0.0 Roll and thin

    Table 1

    [ 10 marks ]

    Question 2 [Forces and Motion / Forces and Pressure]

    Diagram 2 shows a playground swing which will be used for 7 to 15 years old children. The vertical

    height of the swing is 2.5 m. Table 2 shows the characteristics of the swing.

    Diagram 2

    Bar

    l 2.5 m

    Ball bearing

    Angle of V-shape pillar

    floor

    chain

  • Physics Perfect Score_SBP_ 2010 25

    Swing Length of the chain

    from the bar,l / cm

    Joint of chain to

    the bar

    Angle of

    V-shape pillar Type of floor

    K 210 With ball bearing 10o Soft padded floor

    L 150 Without ball

    bearing 10

    o Soft padded floor

    M 210 With ball bearing 40o Soft padded floor

    N 150 With ball bearing 40o Concrete floor

    Table 2

    You are asked to investigate the characteristics of the swings. Explain the suitability of each

    characteristic and determine the most suitable safety swing to be built.

    Justify your choice.

    [ 10 marks ]

    Question 3 [Forces and Motion / Forces and Pressure]

    Table 3 shows four bicycles, W, X,Y and Z, with different specifications.

    Bicycle Diagram Specification

    W

    Distance between seat and handle : 75 cm

    Density of bicycles frame : 700 kg m-3

    Width of tyre : 6 cm

    With gear

    X

    Distance between seat and handle : 75 cm

    Density of bicycles frame : 700 kg m-3

    Width of tyre : 4 cm

    With gear

    Y

    Distance between seat and handle : 45 cm

    Density of bicycles frame : 900 kg m-3

    With of tyre : 6 cm

    Without gear

    Z

    Distance between seat and handle : 75 cm

    Density of bicycles frame : 500 kg m-3

    Thickness of tyre : 4 cm

    With gear

    Table 3

  • Physics Perfect Score_SBP_ 2010 26

    You are required to determine the most suitable bicycle that can be used as a racing bicycle to move

    with high speed.

    Study the specifications of all the four bicycle from the following aspects:

    The distance between the seat and the handle.

    The density of bicycles frame.

    The thickness of tyre.

    The presence of gear

    Explain the suitability of the above aspects and hence, determine the most suitable

    racing bicycle to move with high speed.

    Justify your choice.

    [10 marks]

    Question 4 [Heat]

    A coolant is a fluid which flows through a device to prevent it from overheating. Coolant is commonly

    used in automotive, residential and commercial temperature-control applications. Table 4 shows a list

    of liquid coolants with their respective properties.

    Material Boiling point / oC

    Rate of thermal

    Conductivity Viscosity

    Specific heat

    capacity / JkgoC

    -1

    P 145 High Low 3000

    Q 90 Low Low 1200

    R 130 High High 4500

    S 120 Low Low 2100

    T 95 High High 3200

    Table 4

    You are asked to investigate the properties of materials in table 4. Explain the suitability of each

    property in table 4 and determine which material is the most suitable to be used in the radiator system

    of a car to prevent overheating of its engine.

    [ 10 marks ]

    Question 5 [Light]

    Table 5 shows the arrangement and the specification of two prisms used in the construction of a

    binocular telescope.

    Study and explain the arrangements and specifications from the following aspects.

    - Arrangement of the prisms

    - Diameter of the objective lens

    - Magnification

    - Anti-reflective coating

    You are required to determine a workable arrangement and the most suitable binocular for hunting in

    the jungle.

    Justify your choice.

  • Physics Perfect Score_SBP_ 2010 27

    Arrangement of prism

    Diameter of

    objective

    lens

    Magnification

    Anti-

    reflective

    coating

    P

    55mm 10X Yes

    Q

    55mm 5X Yes

    R

    25mm 5X No

    S

    55mm 5X No

  • Physics Perfect Score_SBP_ 2010 28

    Arrangement of prism

    Diameter of

    objective

    lens

    Magnification

    Anti-

    reflective

    coating

    T

    55mm 10X Yes

    Table 5

    [ 10 marks ]

    Question 6 [Waves]

    Strong retaining walls are usually built in the sea near a harbuor jetty to protect the boats from

    damage caused by strong waves.

    You have been assigned as an engineer to assemble a retaining wall to be build in front of a new

    harbour. Four models for the structure of wall with their suggested locations and characteristics are

    shown in table 6.

    Models Shape of walls Material of

    walls

    Location of

    harbour

    Has several

    openings at the

    wall

    P

    concrete

    Bay

    No

    Q

    Cement

    and bricks

    cape Yes

    R

    Cement

    and bricks

    Bay No

    S

    concrete Bay Yes

    Table 6

    You are asked to build a strong and safe harbour. Study the characteristics in table 6.Explain the

    suitability of the characteristics and determine the most suitable design, characteristics and location

    for the harbour.

    [ 10 marks ]

    Sea waves

    Sea waves

    Sea waves

    Sea waves

  • Physics Perfect Score_SBP_ 2010 29

    Question 7 [Electrics]

    Table 7 shows electric kettles with different types of heating elements. You are asked to study the

    characteristics of four different shapes and properties of material in Table 7 in order to decide which of

    them will be the best for making heating element of the electric kettle.

    Kettle

    Kettle with different shape of

    heating element

    Melting point

    / oC

    Ability to break at

    high temperature

    Oxidisation at high

    temperature

    P

    500

    Easy

    High

    Q

    200

    Hard

    Low

    R

    200

    Hard

    High

    S

    50

    Easy

    Low

    Table 7

    Explain the suitability of each property and determine which shape and property of material is most

    suitable to be used as the heating element in the electric kettle.

    Justify your choice.

    [ 10 marks ]

  • Physics Perfect Score_SBP_ 2010 30

    Question 8 [Electromagnetics]

    Diagram 8 shows a model of an electromagnetic relay which is used to switch on an electric motor.

    Diagram 8

    The resistance of the solenoid of the electromagnet is 20 ohms and the relay needs a minimum

    current of 160 mA to function. Terminal AB must be connected to a power supply and a switch.

    Terminal PQ is connected to another power supply and an electric motor 240 V, 1000 W.

    Table 8

    Based on the information in Diagram 8 and Table 8 , determine

    (a) The type of core you will use in the electromagnet and justify your choice.

    (b) The power supply you will connect to terminal AB . Show your workings and justify your choice.

    (c) The current that will flow in electric motor circuit.

    Determine the most suitable connecting wires for this circuit and justify your choice.

    [ 10 marks ]

    Power Supply

    3 V 6 V

    240 V

    Type of connecting wires Thin copper wires Thin nichrome wires Thick copper wires Thick nichrome wires l

    Type of electromagnet core

    Wooden core Soft iron core Aluminium core

  • Physics Perfect Score_SBP_ 2010 31

    Question 9 [Electronics]

    A fire alarm can be built using a transistor switch circuit. Diagram 9 shows a sketch for the suggested

    circuit.

    Diagram 9

    Group W X Y Z

    A AC power supply

    Fixed Resistor

    Thermistor

    Electromagnetic

    Relay

    B

    DC power supply

    A terminal positive

    B terminal negative

    Thermistor

    Fixed Resistor

    Electromagnetic

    Relay

    C

    DC power supply

    A terminal positive

    B terminal negative

    Thermistor Fixed Resistor Loudspeaker

    D

    DC power supply

    A terminal negative

    B terminal positive

    Fixed Resistor Thermistor Electromagnetic

    Relay

    E

    DC power supply

    A terminal negative

    B terminal positive

    Thermistor Fixed Resistor Loudspeaker

    Table 9

    Table 9 shows the groups of components which should be put to complete the circuit. Explain the

    suitability of each component and determine which group of electronic components is the most

    suitable to complete the circuit in order for the fire alarm to function.

    Justify your choice.

    [ 10 marks ]

    A

    B

    Z

    W

    Y

    X

  • Physics Perfect Score_SBP_ 2010 32

    Question 10 [Radioactivity]

    Leaks in underground water pipes can be detected using radioactive sources. A technician is tracing

    water pipe line laid underground to detect leakage point. Small amount of radioisotope is put in the

    water reservoir Table 10 shows the properties of four radioisotopes.

    Radioisotope Solubility in water Half life Types of radiation Physical state

    W High 15 hours beta Liquid

    X High 8 days gamma Liquid

    Y Low 28 years beta Solid

    Z Low 38 minutes alpha gas

    Table 10

    A Geiger-Muller counter is moved over the pipe according to layout plan. At a point, the Geiger-Muller

    counter detected high radiation level indicating the point of leakage.

    Based on table 10, explain the suitability of the properties of the radioisotopes to be used for

    detecting the leakage then state the most suitable radioisotope to be chosen.

    Justify your choice.

    [ 10 marks ]

  • Physics Perfect Score_SBP_ 2010 33

    SECTION 4 UNDERSTANDING

    ( Paper 2 Section B - Question 9 / Question 10; Section C - Question 11 / Question 12)

    Force and Motion

    1. Figure below shows a worker cutting grass by pushing and pulling a lawn mower.

    Using Physics concepts, compare the difficulty of the job when the worker :

    (i) pushes the lawn mower.

    (ii) pulls the lawn mower.

    You may use diagrams in your answer.

    [4 marks]

    2. Explain how the forces between the molecules caused the elasticity when the spring is

    compressed and stretched.

    [5 marks ]

    Force and Pressure

    3. Explain why a balloon filled with helium gas rises up in the air.

    [4 marks]

    4. Explain why a weather balloon that is rising up in the air will stop at certain altitude.

    [4 marks]

    5. Diagram 12.2 shows a motorcycle and a bus speeding on a highway track.

    Describe the possibilities of the movement of both vehicles when they are speeding side

    by side.

    Explain your answer.

    [ 4 marks]

  • Physics Perfect Score_SBP_ 2010 34

    6. Diagram shows the brake system of a car.

    Explain how the system operates when the car needs to slow down.

    [4 marks]

    7. Using kinetic theory of gasses, explain how the pressure increase when the temperature

    increase.

    [4 marks]

    Heat

    8. A housewife found that the time taken to cook the same quantity of food when the wok is

    covered is shorter than when using the wok without its cover.

    Explain this statement.

    [3 marks]

    9. Diagram shows the basic components and four processes in a refrigerator.

    i. Explain, using the kinetic theory, how the coolant changes from a gas to a liquid in

    Process 2.

    [3 marks]

    ii Explain, in terms of latent heat, how the coolant removes heat in Process 3 and

    Process 4.

    [2 marks]

  • Physics Perfect Score_SBP_ 2010 35

    Light

    10. Explain how you would estimate the focal length of a convex lens in your school laboratory .

    [4 marks]

    11. While driving a car on a hot day, you may see a mirage on the road.

    Explain how mirage occurred.

    [ 4 marks ]

    Waves

    12. Explain why the wavefronts in the sea follow the shape of the coastline as the water

    becomes shallower.

    [ 4 marks ]

    13. Diagram shows a sound wave produced by vibration of a tuning fork. The sound

    wave travels in air.

    With the help of Diagram 10.3 explain how the sound wave is produced.

    [4 marks]

  • Physics Perfect Score_SBP_ 2010 36

    Electricity

    14. Diagram 12.1 shows a ping pong ball coated with thin metal foil placed between a pair of

    parallel metal disc. When the E.H.T is switched on, an electric field is formed in between the

    metal disc.

    Explain what will happen to the ping pong ball when it is brought to touch the metal disc

    connected to positive terminal of EHT?

    [4 marks]

    Electromagnetics

    15. Nichrome wire is widely used as a heating filament. However, tungsten wire is more preferred

    as heating filament in the light bulb. Explain the statement.

    . [4 marks]

    16. Explain why the bulb connected to two dry cells lights up brighter than one bulb connected to

    one dry cell.

    [4 marks]

    17. Diagram shows the pattern of magnetic field formed when current flows in a coil.

    Explain why the magnetic field strength is greater at the center compared to the edge.

    [3 marks]

  • Physics Perfect Score_SBP_ 2010 37

    18. Diagram shows a direct current generator.

    Explain how the above generator works to produce direct current.

    [4 marks]

    19. Diagram shows a simple direct current electric motor.

    Using the concept of the magnetic effect of an electric current, explain with the aid of

    diagrams how forces are produced on a wire in the coil, as shown in the diagram above.

    [4 marks]

    Electronics

    20. Diodes act as rectifiers. They allow current to flow in one direction. With the aid of diagrams,

    explain the mechanism of current flow in a semiconductor diode.

    [4 marks]

    21. Diagram 10.3 shows a shadow is formed on fluorescent screen of the Maltase cross tube.

    Explain how the shadow is formed on the fluorescent screen ?

    [5 marks]

    Radioactivity

    22. Radioisotope Strontium-90 is used to measure the thickness of paper in a paper industry .

    Explain how Strontium-90 is used to measure the thickness piece of paper?

    [4 marks]

  • Physics Perfect Score_SBP_ 2010 38

    SECTION 5 PROBLEM SOLVING (QUANTITATIVE)

    ( Paper 2 Section A ; Section C - Question 11 / Question 12)

    Question 1 : Forces and Motion

    A ball is hit straight up into the air with a speed of 25 ms-1

    .

    (a) How high does it go? [2 marks]

    (b) How long it is in the air? [2 marks]

    Question 2 : Forces and Motion

    Diagram 2.1 shows how the velocity of an object varies for 600 s duration.

    Calculate (a) the displacement of the object in 600 s. [2 marks]

    (b) The average velocity of the object [2 marks]

    Question 3 : Forces and Motion

    A car of mass 1200 kg travelling at 72 km/h is brought to rest in 4s. Find

    (a) The average deceleration [2 marks]

    (b) The average breaking force [1 marks]

    (c) The distance moved during the aceleration [2 marks]

    2000

    100 3000

    4000

    5000

    6000

    velocity /ms-1

    time /s

    - 4

    Diagram 2.1

    P

    Q R

    S

    T

    U

    8

    0

  • Physics Perfect Score_SBP_ 2010 39

    Question 4 : Forces and Motion

    Graph 4 shows the relationship between the stretching force, F and the spring extension, x.

    Graph 4

    (a) Calculate the spring constant of P and Q [3 marks]

    (b) Using the graph, calculate the elastic potential energy stored in spring P when

    its extension is 0.5 cm

    [2 marks]

    Question 5 : Force and Motion

    A 50.0 kg person stands on a scale in an elevator. What does the scale read when

    (a) The elevator is at rest [1 marks]

    (b) The elevator is falling at 3.0 ms-1

    [2 marks]

    (c) The elevator is accelerating upward at 3.0 ms-1

    [2 marks]

    Question 6 : Force and Motion

    An explosion breaks an object into two pieces, one of which has 1.5 times the mass of the other. If

    5000 J were released in the explosion, calculate the kinetic energy did each piece acquire?

    Question 7 : Forces and Motion

    A spring is used to launch a 100 g ball to a vertical maximum height of 5.0 m. The spring will be

    compressed 10.0 cm when it is loaded.

    (a) Calculate the speed of the ball speed as it is released from the spring [2 marks]

    (b) Calculate the kinetic energy of the ball when it is released from the spring [1 marks]

    (c) Determine the spring constant, k [2 marks]

    Question 8 : Forces and Pressure

    F (N)

    x (cm)

    P

    Q

    8

    7

    6

    5

    4

    3

    2

    1 0 0.1 0.2 0.3 0.4 0.5

    Graph F against x of

    spring P and spring Q

  • Physics Perfect Score_SBP_ 2010 40

    Diagram 6 shows a simple hydraulic machine used for lifting heavy loads such as cars in a garage. It

    consists of two pistons, X and Y of cross sectional area 0.02 m2 and 0.28 m

    2, respectively. When

    piston X is pressed down by applying a force of 15 N, a large force is produced on piston Y.

    Diagram 6

    (a) Calculate the pressure exerted on the liquid by piston X [1 mark]

    (b) Calculate the maximum load that can be lifted by piston Y [2 marks]

    (c) If piston X is depressed downwards by a distance of 21 cm, what is the distance

    moved by piston Y?

    [2 marks]

    Question 9 : Heat

    A tank holding 50 kg of water is heated by a 3 kW electric immersion heater. The temperature rises

    from 10oC to 60

    oC [specific heat capacity of water = 4200 J kg

    -1 oC

    -1]

    Determine

    (a) Heat received by water [2 marks]

    (b) The time for temperature to rise from 10oC to 60

    oC [2 marks]

    For Question 10 and 11, the values in the table below are required:

    water ice aluminium

    Specific heat capacity (J g -1

    oC

    -1] 4.2 2.0 0.9

    Specific latent heat (J g -1

    ) 2300 340

    Question 10 : Heat

    How much heat is needed to change 20 g of ice at 0oC to steam at 100

    oC? [4 marks]

    Question 11 : Heat

    An aluminium can of mass 100 g contains 200 g of water. Both, initially at 15 oC, are placed in a

    freezer at -5 o

    C. Calculate the quantity of heat that has to be removed from the water and the can for

    their temperatures to fall to -5 oC.

    [5 marks]

    Question 12 : Light

    A simple magnifying glass produces an enlarged upright image when an object is situated 10 cm from

    the lens. If the size of the image is twice that of the object, calculate:

    (a) the distance of the image from the lens [2 marks]

    (b) the focal length of the lens [2 marks]

  • Physics Perfect Score_SBP_ 2010 41

    Question 13 : Light

    Diagram 11 shows an object O is placed in front of a lens, Z.

    Diagram 11

    An image formed on the screen is two times the size of the object. The object O and screen are 60.0

    cm apart when the image is sharply focused.

    (i) State which type of lens is used and give reason for your answer.

    (ii) Calculate the focal length of the lens. [5 marks]

    Question 14 : Light

    Diagram 12 shows a square block of glass JKLM with a ray of light incident on side JK at an angle of

    incidence of 60o. The refractive index of the glass is 1.50.

    (a) Calculate the angle of refraction of the ray [2 marks]

    (b) Calculate the critical angle for a ray of light in the glass [2 marks]

    (c) Explain why the ray cannot emerge from side KL but will emerge from side LM [3 marks]

    Question 15 : Electricity

    The mass of the load is 0.8 kg and is lifted to a height 1.5 m in 4.0 second. The reading of the

    ammeter and voltmeter are 1.2 A and 5.0 V respectively.

    Objec

    t O Lens Z screen

    K L 60

    o

    J M

  • Physics Perfect Score_SBP_ 2010 42

    Calculate

    (b) energy input to the motor [2 marks]

    (c) the efficiency of the motor [1 mark]

    Question 16 : Electromagnetism

    Diagram shows an electric bell 12 V,10 W is connected to the output of a transformer. The efficiency

    of the

    transformer is 80%.

    Calculate

    (a) the electric current in the electric bell [2 marks]

    (b) the electric current in the primary coil [3 marks]

    Question 17 : Electromagnetism

    A generator with a power output of 20 kW at 4kV distributes power to a workshop along cables having

    a total resistance 16 .

    Calculate :

    (a) the current in the cables [2 marks]

    (b) the power loss in the cables [2 marks]

    (c) the potential drop between the ends of the cables [1 marks]

    Question : 13 Electronics

    Diagram 13 shows a fire alarm circuit using a transistor as a switching divice.

    DIAGRAM 13

    Bell

    240 a.c 12 V, 10 W Electric bell

  • Physics Perfect Score_SBP_ 2010 43

    Resistor T is a thermistor. G will switch on and ring the bell if the potential difference Y and Z exceed

    3.2 V. S is a fixed resistor with resistance of 6 k. When there is a fire burning, resistance at T is 3.5

    k. . Calculate the potential difference : (a) across T [2 marks]

    (b) across S [2 marks]

    (c) Is the bell ringing at that time? Explain your answer. [2 marks]

    SECTION 6 DESIGN EXPERIMENT (Paper 3 Section b- Question 3/ Question 4)

    Based on the diagrams in Questions 1- 15,

    (a) make one suitable inference .

    (b) state one appropriate hypothesis that could be investigated.

    (c describe how you would design an experiment to test your hypothesis

    In your explanation, state clearly the following :

    (i) The aim of the experiment

    (ii) The variables in the experiment

    (iii) The list of apparatus and materials

    (iv) The arrangement of the apparatus

  • Physics Perfect Score_SBP_ 2010 44

    (v) the procedures of the experiment, which includes the method of controlling the manipulated

    variable and the method of measuring the responding variable

    (vi) the way you would tabulate the data

    (vii) the way you would analyse the data

    No. Situation

    Q1

    Diagram 1.1 and 1.2 show two similar electric kettles used to boil water. The power ratings for the kettles are

    240 V, 1000 W. It is found that the water in the kettle in Diagram 2.2 boils faster than the water in the kettle in

    Diagram 2.1.

    Diagram 1.1 Diagram 1.2

    Q2

    Diagram 2 shows a model of direct current motor.

    Diagram 2

    He found that the rotation of the coil speed up when he use more batteries.

    Q3

    Diagram 3 shows a man is in a leaking boat. He noticed that the spurt coming from the hole at the bottom of the boat is higher compared to the one from the side.

    Q4 Diagram 4 shows a boy cycling at night. The bicycles lamp becomes brighter when he cycles faster.

    bottom hole

    side hole

  • Physics Perfect Score_SBP_ 2010 45

    No. Situation

    Diagram 4

    Q5

    Aleesa was playing a game of ping-pong (table tennis) with her friend and they are left with only one ping-pong ball.

    After playing for a while, they found that the ping-pong ball had a slight dent in it. Aleesa observed that the dented ping-

    pong ball as in Diagram 5.1 was restored after pouring some hot water on it as shown in Diagram 5.2.

    Diagram 5. 1 Diagram 5.2

    Q6

    Diagram 6.1 shows a fisherman starting his fishing journey in the morning. Diagram 6.2 shows the fisherman

    returning with a boat loaded with fish. The boat sinks deeper into the water.

    Q7

    Diagram 7 shows an electromagnetic crane is used to carry scrapped metal in industrial area. When the

    current flows in the electromagnet is reduced, it is noticed that the amount of scrapped metal carried will be

    less.

    Diagram 7

    Diagram 6.1 Diagram 6.2

  • Physics Perfect Score_SBP_ 2010 46

    No. Situation

    Q8

    Diagram 8.1 shows a fisherman starting his fishing journey in the morning. Diagram 8.2 shows the fisherman returning with a boat loaded with fish. The boat sinks deeper into the water.

    Q9

    Diagram 9.1 shows a diver dives in the sea. Diagram 9.2 shows the same diver dives in the fresh water in the

    same depth. Sea water is more dense than fresh water. The diver found that his ears will be painful when diving

    in the sea water compared to fresh water.

    Diagram 9.1 Diagram 9.2

    Q10

    Diagram 10.1 shows a boy is trying to pull out a fish from the water. Diagram 10.2 shows the boy is having

    difficulty to pull out the fish from the water when half of the fish body is already out of the water.

    Sea water Fresh water

    Diagram 8.1 Diagram 8.2

    Fish Fish

  • Physics Perfect Score_SBP_ 2010 47

    No. Situation

    Diagram 10.1 Diagram 10.2

    Q11

    Diagram 11.1 and 11.2 shows two roadside stalls selling ABC and PAU. Both stalls are using the same

    bulbs and batteries that are new. The bulb at the ABC stall is brighter than the bulb at the PAU stall.

    Q12

    Diagram 12 shows a 12V 12 W light bulb connected to a 12 V power supply. The ammeter reading is 1.0 A.

    After a while it is noticed that the ammeter reading is 0.9 A. The bulb becomes hot .

    Battery

    Batter

    y

    Diagram 11.1

    Diagram 11.2

  • Physics Perfect Score_SBP_ 2010 48

    No. Situation

    Diagram 15.1

    Q13

    Diagram 13 shows an oxygen host in an aquarium which produce some bubbles. The volume of the bubbles

    increase when the bubbles reach the surface of water.

    Diagram 13

    Im a great believer in luck;

    and I find the harder I work, the more I have of it

    Air pump

    Conceptualisation