FIZIKMOZAC 2010 CHAPTER 9: ELECTRONIC 9.1 CRO 1. Question 4: Melaka 09 Diagram 4.1 shows a deflectin cathode rays tube (a) The function of the filame heat the cathode and rele electrons on its surface (i) Name the process ment ……………………………… (ii) Explain why a very high of 3000 V is used in Diag ......................................... (iii) State the energy change experience by the electr from anode to the scree ……………………………… (b) The voltage between the c and anode is 3000 V. The of an electron is 1.6 x 10 -1 Calculate the kinetic ener possesses by an electron reaches the anode. [ ng ent is to eases tion in (a) ………… [1 mark] h voltage gram 4.1 ................ [1 mark] es rons en. ………….. [1 mark] cathode charge 19 C. rgy n as it [2 marks] (c)(i) 1000 V power suppl connected to the top plates. The top plate to the positive termi lower plate is conne negative terminal. S path of the cathode Diagram 4.2. (c)(ii) From the answer in one characteristic rays. ……………………… 2. Question 4: Kedah Diagram 4.1 shows the st cathode ray oscilloscope (a) State the process in producing electron f X. ................................... ly is p and lower e is connected inal and the ected to the Sketch the rays in [1 mark] n (c)(i), state of cathode ………………….. [1 mark] h 08 tructure of a e (CRO) nvolved in from electrode ........................ [1 mark]
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FIZIKMOZAC 2010
CHAPTER 9: ELECTRONIC
9.1 CRO
1. Question 4: Melaka 09Diagram 4.1 shows a deflectingcathode rays tube
(a) The function of the filament is toheat the cathode and releaseselectrons on its surface
(i) Name the process mention in (a)
………………………………………
(ii) Explain why a very high voltageof 3000 V is used in Diagram 4.1
State the energy changesexperience by the electronsfrom anode to the screen.
………………………………………..[1 mark]
The voltage between the cathodeand anode is 3000 V. The charge
19 C.Calculate the kinetic energypossesses by an electron as it
[2 marks]
(c)(i) 1000 V power supply isconnected to the top and lowerplates. The top plate is connectedto the positive terminal and thelower plate is connectednegative terminal. Sketch thepath of the cathode rays inDiagram 4.2.
(c)(ii) From the answer in (c)(i), stateone characteristic of cathoderays.
………………………………………..
2. Question 4: Kedah 08Diagram 4.1 shows the structure of acathode ray oscilloscope (CRO)
(a) State the process involved inproducing electron from electrodeX.
(b) (i) Draw the arrangement offour diodes and suitablepower supply in the spacegiven in Diagram 6.3 thatcan be used to produce fullwave rectifier circuit.
[3 marks]
ToCRO
FIZIKMOZAC 2010
(iii) Draw the wave form of fullwave rectification
[1 mark]
(iv) Name an electroniccomponent that can beused to smooth thecurrent produced.
7. Question 6: Trengganu 07Diagram 6.1 shows a circuit toinvestigate the working principletransistor.The rheostat R is adjusted to get a setof data of the microammeter reading ,I1 and the miliammeter reading, I
Diagram 6.1
Calculate the minimum value ofwhen the transistor is
[2 marks]
is then replacedwith a light dependent resistorwhich has a high resistance when it
Explain whether the bulb willlight up during the day.
(e) An automatic fire alarm is neededto emit sound in case of fire.Suggest two modifications thathave to be made to the circuit inDiagram 7.1 by replacing thecomponents with suitableelectronic components.
11.Question 8: Melaka 08Diagram 8.1 shows four electricalcircuits with identical electricalcomponents.The electrical circuits consist otransistor , a bulb, a light dependentresistor, LDR, two resistors, Rand battery as a power supply.
(b) Based on Diagram 8.1, state thesuitable characteristic of thearrangement position of theelectrical components of thecircuit to use as an automaticswitch.
(c) Based on the answers in 8(b), stateone suitable circuit in Diagram 8to be use as an automatic switch..............................................................
(d) The circuit in 8(c) is used as anautomatic switch. State theapplication of the circuit.
(c) Diagram 8.3 shows a simpletsunami control system used todetect an earthquake anderuption volcano at the sea bedwhich will produced tsunami.
The circuit consists of vibrationsensor, V, and waves temperaturesensor, T, athe sea bed. The vibrationand increase in temperature detectedwill produce signals whichl will besent to a logic gate and then to thetsunami operation detector roomthrough the transmitter.
Water temperature sensor, T:High temperature: Logic ‘1’Low temperature: Logic ‘0’
Output S:Radar is activated : Logic ‘1’Radar is deactivated: Logic ‘0’
Tsunami will occur when there is avibration or change of hightemperature at the sea bed.Table 8 is a truth table which showsthe operation of the logic gate in thetsunami control system.
V T S0 00 11 01 1
(i) Using the keys given,complete Table 8.
[2 marks]
(ii) Name the logic gate in thecircuit in Diagram 8.3
(b)(i) Based on Figure 4, complete theTruth table below.
Input OutputA B C0 00 11 01 1
[3 marks]
(b)(ii) Draw the symbol of the logicgate which is equivalent tooutput C.
[1 mark]
FIZIKMOZAC 2010
16.Question 5: MRSM 09Diagram 5.1 shows an electronicsystem used to switch on a securitylight outside a house.
(a) Name the type of logic gatewhich receives input A.
(b) Based on Diagram 5.1, completethe following sentences aboutinput A, B and C by ticking themark (x) in the correct bracket.(i) If the surrounding is dark
Input A will be
And so input B will be
[2 marks]
(ii) If a person is detected,input C will be
(c) The security light should beswitched on if a person isdetected when it is dark. Namethe type of logic gate whichshould be used in the boxmarked ‘Logic Gate X’.
18.Question 7: Perak 07Diagram 7.1 shows a circuit that turnson a water pump.
Diagram 7.1
When the output from the NOR gate ishigh, the water pump is on. The soilcontacts are buried in the soil near theplants. When the soil dries the logicstate of input B changes from high(logic 1) to low (logic 0).
(a) (i) Explain why the logic state ofinput B is low when the soil isdry.
(c) The water pump is on. State(i) The logic levels of
input B and output Q.
Input A :…………………
Input B : …………………
Output Q : …………………….
(ii) The light level (dark orbright) and the soilcondition (wet or dry).
Light level:…………………
Soil condition :………………
19.Question 8: Trengganu 09Diagram 8.1 shows an automaticparking barrier for any vehicle enterparking lots. The parkingautomatically rises up when asufficient amount of coin is slotted in amachine or an applicable electroniccard is touched to the detector.
Explain why the logic state ofinput A is low when it is darkand high when it is bright.
The water pump is on. StateThe logic levels of input A,input B and output Q.
Input A :…………………
Input B : …………………
Output Q : …………………….[3 marks]
The light level (dark orbright) and the soil
ondition (wet or dry).
Light level:…………………
Soil condition :………………[2 marks]
Question 8: Trengganu 09Diagram 8.1 shows an automaticparking barrier for any vehicle enterparking lots. The parking barriersautomatically rises up when asufficient amount of coin is slotted in amachine or an applicable electroniccard is touched to the detector.
FIZIKMOZAC 2010
Diagram 8.2 shows the circuit used inthe automatic parking barrier.
(e) Using two switches, two drycells and a bulb draw a circuitthat equivalent to logic gate ind(iii)
[2 marks]
20.Understanding: Johor 07A semiconductor diode is made fromcombination of an n-typesemiconductor and p-typesemiconductor.
(a) Explain how an n-typesemiconductor is produce.
[2 marks]
Diagram 12.1 and 12.2 shows a circuitconsisting of a diode and a bulb.
(a) Based on Diagram 12.1 andDiagram 12.2, which bulb willlight up?
[1 mark]
(b) Explain how the bulb will lightup.
[3 marks]
Draw a circuit to produce full-waverectification and show the inputVoltage and the output voltage waveforms.
Explain why a capacitor is connectedin the Diagram 12.3 and how itfunctions.
21.Making decision: Johor 07You are required to set up a batterycharge for your hand phone by usinglower a.c input voltage as in Diagram12.3 and in Table 12.1.
RatioN1:N2
Type oftransformer
core
Diodearrange-
ment100
80
60
40
20
Solid coppercore
Laminatedcopper core
Solid softiron core
Laminatedsoft iron
core
Half-waverectification
Full waverectification
Table 12.1
Study the information in Diagram 12.3and Table 12.1 determine:
(i) the number of turns in theprimary coil and thesecondary coil of thetransformer and justify yourchoice.
(ii) the type of core you will usein the transformer and justifyyour choice.
(iii) the diode arrangement youwill use and justify yourchoice.
[6 marks]
FIZIKMOZAC 2010
22.Section B: Trengganu 09Diagram 10.1 and 10.2 show thedeflections of a cathode ray in adeflection tube.
Diagram 10.1
Diagram 10.2
(a) What is the meaning of cathoderay?
(b) Using Diagram 10.1 andDiagram 10.2,(i) State the charge of the
cathode ray
(ii) Compare the voltage of EHTconnected to the metal plateand the deflection of thecathode ray.
[2 marks]
(c) State the relationship between(i) The voltage of EHT and the
strength of the electric fieldbetween the metal plates.
Section B: Trengganu 09Diagram 10.1 and 10.2 show thedeflections of a cathode ray in a
of cathode
[1 mark]Using Diagram 10.1 and
State the charge of the
[1 mark]
Compare the voltage of EHTconnected to the metal plateand the deflection of the
[2 marks]
State the relationship betweenvoltage of EHT and the
strength of the electric fieldbetween the metal plates.
[1 mark]
(ii) The strength of the electricfield between the metalplates and the deflection ofthe cathode ray.
(d) Diagram 10.3 shows a shadow isformed on fluroscent screethe Maltese cross tube.
Diagram 10.3
Explain how the shadow isformed on the fluorescentscreen?
(e) Maltese cross tube in Diagram10.3 is not suitable formeasuring the frequency of thesound waves. Suggestmodification that can be madeto the Maltese cros tube inDiagram 10.3 to transform it intoCathode Ray Oscilloscope thatcan measure the frequency ofthe sound waes.
In your suggestion, state thecomponents that are used and theirfunction based on the followingaspects:
- the electron gun- the deflection system
The strength of the electricfield between the metalplates and the deflection ofthe cathode ray.
[1 mark]
Diagram 10.3 shows a shadow isformed on fluroscent screen ofthe Maltese cross tube.
Diagram 10.3
Explain how the shadow isformed on the fluorescent
[4 marks]
Maltese cross tube in Diagram10.3 is not suitable formeasuring the frequency of thesound waves. Suggestmodification that can be made
the Maltese cros tube inDiagram 10.3 to transform it intoCathode Ray Oscilloscope thatcan measure the frequency of
In your suggestion, state thecomponents that are used and theirfunction based on the following