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ĐỀ CƯƠNG ÔN THI ANH VĂN CHUYÊN NGHÀNH ĐIỆN TỬ
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Unit 1: ELECTRONICS IN THE HOME
1. Electronics began ____the start of twentieth century with the invention of the
vacuum tube
A. at@ B. in
C. on D. with
2. It was not until 1958 that microelectronics began with the development of ____
on silicon chips
A. CDs B. hi-fi
C. ICs @ D. vacuum tube
3. Electronics timers ____in digital alarm clocks, water heaters, electric cookers and
microwave ovens
A. is found B. are found @
C. is founded D. have been founding
4. In a simple radio, the function of the tuner is:
A. to select the required signal @
B. to separate off the audio part of the signal
C. to amplify the signal
D. to drive the loudspeaker.
5. In a simple radio, the function of the detector is:
A. to select the required signal
B. to amplify the signal
C. to separate off the audio part of the signal @
D. to drive the loudspeaker.
6. In a simple radio, the function of the AF amplifier is :
A. to select the required signal
B. to amplify the signal @
C. to separate off the audio part of the signal
D. to drive the loudspeaker.

A. high-finger B. high-fidelity @
C. hide-fidelity D. hide-finger
UNIT 2: COMPONENT VALUES
16. Resistors ______ with colored band to ease the problem of marking such small
components.
A. code B. coded
C. are coded @ D. is coded
17. In a coded resistor, the forth band indicate___
A. the tolerance@ B. first digit
C. forth digit D. number of zero following
18. If the forth band of a coded resistor is red, it means that
A. the tolerance is 2% @ B. the tolerance is 5%
C. the tolerance is 10% D. the tolerance is 20%
19. Relaxing the tolerance of the resistor enables the manufacture to sell them more
_____
A. cheaper B. cheaply @
C. cheaplier D. expensive
20. The preferred value may seem _____ at first sight but this not so.
A. illogic B. logical
C. illogical @ D. illogically
21. Why do manufacturers make resistors in the preferred values rather than in
equally stepped values?
A. Because they will sell resistors more cheaply @
B. Because they will sell resistor more cheaper.
C. Because they will sell resistors more expensively
D. Because they can not do so
22. The fist band of a colored-banding coded capacitor indicate___
A. fist digit @ B. number of zeros following
C. tolerance D. voltage
23. The forth band of a colored-banding coded capacitor indicate___

31. ______ consists of layers of air molecules stretching from about 80km above the
earth to 500km.
A. atmosphere B. troposphere
C. ionosphere @ D. stratosphere
32. VHF, UHF, and microwave signals are the _____
A. space wave @ B. sky wave
C. ground wave D. surface wave.
33. When _____quickly, A cell may become hot
A. discharge B. discharged
C. discharging@ D. A cell dischange
34. The related noun(s) of the verb “Absorb” is/are
A. absorber B. absorbtion
C. absorption D. A&C are correct@
35. The related noun of the verb “conduct” is/are
A. conducter B. conducted
C. conductivity@ D. conducty
36. AF is the abbreviation of_____
A. Audio Function B. Audition Fan
C. Audio Frequency@ D. Audible Food
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37. RF is the abbreviation of_____
A. Radio Frequence B. Radar Frequency
C. Radio Frequency@ D. Road Frequency
38. AM is the abbreviation of_____
A. amplitude-modulated@ B. amplituding - modulated
C. amplituding - modulated D. amplitude - modulating
39. FM is the abbreviation of_____
A. frequency- modulating B. frequency-modulated@
C. frequent- modulated D. frequent- modulating

A. analogue B. digital@
C. electromagnetic D. magnetic
49. the word “as” in the sentence “As the disc is revolved, a laser beam is used to
mark audio information pattern on its surface” means
A. because B. when@
C. equal D. for
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50. After punching the centre hole,a _____ is applied and the CD is packaged
A. label@ B. a pit mark
C. a layer of plastic D. a box
UNIT 5: COMPUTER
51. The I/O (input/output) unit _____ of one or more ICs.
A. has B. consist
C. consists@ D. includes
52. ______ is/are used to control the data going in and out of the computer
A. I/O units @ B. ROM
C. RAM D. address bus
53. The small ROM _____ some permanent storage
A. gives B. provides@
C. give D. provide
54. What is used for temporary storage?
A. RAM@ B. ROM
C. CPU D. register
55. The contents of the RAM are constantly____.
A. changing@ B. change
C. changes D. fixed
56. What provides some permanent storage?
A. RAM B. ROM@
C. CPU D. register

C. resistor D. capacity
65. What is used to measure very small current?
A. voltmeter B. miliammeter@
C.milimeter D. meter
66. What is used to check the logic level in the pins of ICs?
A. VOM B. Oscilloscope
C. logic probe@ D. Amp meter
67. What is used as a part of a burglar alarm to detect movement?
A. motion sensor@ B. automatic cut-off
C. entry and exit relay D. battery backup
68. What is used for the transmission of RF signal?
A. detector B. radio set
C. aerial @ D. receiver
69. What is used for protecting circuits from surge in voltage?
A. Diode B. Fuse@
C. Resistor D. Switch
70. What is used to master down different recordings to make a master tape?
A. Microphone B. CD
C. multi-track recorder D. mixer @
71. What is used to find buried metal?
A. Radio B. Radar
C. detector@ D. TV
72. What is the meaning of prefix semi-?
A. haft@ B. full
C. all D. not thing
73. What is the meaning of prefix de-?
A. opposite of B. reverse of the action@
C. far D. across
74. What is the meaning of prefix dis-?
A. opposite of @ B. reverse of the action

84. What are two common families of logic ICs?
A. TTL and CMOS @ B. BJT and CMOS
C. TTL and FET D. BJT and FET
85. TTL is the abbreviation of _____
A. Transistor – Transfer logic B. Transistor – transistor Location
C. Transistor – Transfer Location D. Transistor – transistor Logic@
86. CMOS is the abbreviation of _____
A. Complementary Metal Oxide Semiconductor. @
B. Common Metal Oxide Semiconductor.
C. Complementary Means Oxide Semiconductor.
D. Complementary Metal Oxide Semiresistor.
87. VLSI is the abbreviation of _____
A. Very Large Signal of Integration
B. Very Large Scale of Integration @
C. Very Long Scale of Integration
D. Very Long Signal of Integration
88. MSI is the abbreviation of _____
A. Middle Scale of Integration
B. Medium Scale of Integration @
C. Medium Signal of Integration
D. Middle Signal of Integration
89. What is shown in a truth table?
A. The output for all possible inputs@
B. the arrangement of the gates and the function of each pin on the chip
C. Basic gates
D. logic symbol
90. Which logic gate whose output is only high when all its inputs are high?
A. OR B. AND@
C. NAND D. NOR
91. What is shown in an IC pin-out diagram?

A. no visible @ B. not visible
C. visible D. no invisible
100. ____signals are used to prevent interference from any constant infra-red
background ‘noise’
A. Pulse B. Pulsed @
C. analogue D. Pulsing
101. When the transmitter is switched on, _____signals are sent from the transmitter
to the receiver
A. micro wave B. ultra-violet
C. infra-red @ D. analogue
102. A code ___by the length and spacing of these pulses switches on the LED
A. spelling out B. spelted out
C. be spelt out D. spelt out @
103. The electrical pulses are converted by the ___into pulsed infra-red radiation
which is directed at the receiver
A. LED @ B. LDR
C. transistor D. resistor
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104. The frequency of the oscillator is set by the _____ timing components R1,R2,
and C1
A. internal B. international
C. external @ D. externally
105. The current output of the amplifier is controlled by the resistor R3 which is
connect in _____with the LED
A. series @ B. sery
C. serial d. serially
UNIT 7: ALARM SYSTEM
106. A magnet mounted on the moving part of the window or door ______a switch
mounted on the frame when the window or door is opened.

A. nitrogen @ B. hydrogen
C. oxygen B. water
116. “You won’t set off the alarm when leaving or returning to the house”. This is –
the _____ feature of alarm system
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A. Entry and exit relay @ B. automatic cut-off
C. tamper protection D. battery backup
117. “This will stop the alarm after it has sounded for a set time, so that the noise
doesn’t go on for hours if you’re not there to reset the system”. This is the _____
feature of alarm system
A. Entry and exit relay B. automatic cut-off @
C. tamper protection D. battery backup
118. “The control panel incorporates sensors which will trigger the alarm if a burglar
tries to force the box open”. This is _____ feature of alarm system
A. Entry and exit relay B. automatic cut-off
C. tamper protection@ D. battery backup @
119. “If an intruder disconnects the main supply, the alarm will continue to work in
a power cut”. This is _____ feature of alarm system
A. Entry and exit relay B. automatic cut-off
C. tamper protection D. battery backup @
120. The opposite of cut-off is
A. cut-on B. cut-in
C. situation @ D. cut-in
121. The opposite of increase is
A. up B. forward
C. decrease @ D. unincrease
122. The opposite of fixed resistor is
A. light resistor B. variable resistor @
C. LED D. coal resistor

131. When an AC voltage is applied to the search coil, a ____field is produce
A. magnetic @ B. electronic
C. electrical D. electric
132. The __ voltage is converted into audible note by the circuitry in the control box.
A. inducing B. induced @
B. be induced D. be inducing
133. A microphone may be used to ___ sound
A. detect @ B. induce
C. generate D. make
134. Electrical pulsed are fist ____at a frequency in the upper audio range by the
audio oscillator.
A. generated @ B. induced
C. detected D. generating
135. The oscillator ____ pulses at a fixed frequency of 32 786 Hz
A. generate B. generates @
C. induce D. induced
136. What is used to convert digital signal into analogue signal?
A. DAC converter @ B. ADC converter.
C. DCA converter D. ACD converter
137. What is used to convert analogue signal into digital signal?
A. DAC converter B. ADC converter @
C. DCA converter D. ACD converter
138. What is used to convert AC into DC?
A. rectifier @ B. ADC converter
C. transformer D. relay
139. What is used to convert electronic pulse into infra-red pulse?
A. LED @ B. LDR
C. LCD D. relay
140. special detectors are used in at airport to screen passengers for ___weapon (vũ
khí)

operators to man them and maintain them.
A. but also B. but
C. A and B is correct@ C. A and B is incorrect
149. Automation has led to saving for the manufacturer but has also contributed to __
A. unemployment@ B. employment
C. employ D. unemployed
150. People today expect to be able to get in touch ____ each other at any time and in
any place
A. to B. with@
C. from D. for
151. Society ____a wide range of leisure electronic items
A. expects B. expect
C. have expected D. expecting
152. Recent years have seen a sharp ___in equipment for patient care.
A. increase B. increased
C. is increase D. All is incorrect
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