DE CUONG ON THI ANH VAN CHUYÊN NGHÀNH ĐIỆN TỬ (4_*4 Created by whitestone04 from www.et-hui.com *_* )
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 _
10
11
on silicon chips
A CDs B hi-fi
C ICs @ D vacuum tube
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
Ina 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
Ina 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
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
The radio _a tuner, a detector, and an AF amplifier A consists of B is composed of
C consist of D A & B is correct@
A tuner, a detector, and an AF amplifier the radio
A comprise ( bao gom)@ B combine
C consist D compose
Ina simple radio, the tuner to the detector
A is connected B is linked to
C is connecting D A & B is correct@
The volume control consists of a ten-microfarad electrolytic capacitor connected with a five-kilohm potentiometer (POT)
A.inseries @ B in serial
C parallel D directly
What is used to convert sounds into audio frequency signal?
A loudspeaker B mixer
Trang 2
12 What is used to amplify the power of the modulated carrier wave? A RF power amplifier@ B amplifier
C aerial C modulator
13 the function of the aerial is:
A to amplify the power of the modulated carrier wave
B to transmit the modulated carrier wave over long distances C to receive the RF weak signal
D.B & C is correct @
14 CD is the abbreviation of
A Composed disc B compact driver C compact disc @ D compacted disc 15 hi-fi is the abbreviation of
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 Ina 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 _
A fist digit B number of zeros following
Trang 324 The fifth band of a colored-banding coded capacitor indicate_ _
A fist digit B number of zeros following
C tolerance D voltage @
25 Carbon resistors are compressed graphite which is formed into small tubes
A made of @ B made in
C made from D made to
UNIT 3: RADIO
26.Based on the way of travel, how many kinds of radio waves ? A One kind: surface or ground wave
A Two kinds: surface wave and sky wave
C Three kinds: surface or ground wave, sky wave and space wave @
D Four kinds: surface wave, ground wave, sky wave and space wave
27.Surface or ground wave travels along the ground, following the of the earth’s surface
A curvature @ B culture
C line D picture
28 Which material (vat liéu) has poor conductor?
A water B sand @
C A&B is correct D A&B is incorrect
29.Poor conductors absorb surface or ground wave more than good conductor
A weakly B easily
C strongly @ D hardly
30 travels skywards and, if it is below a certain critical frequency (typically 300MHz), is returned to earth by the ionosphere
A surface or ground wave B space wave C surface or ground wave and sky wave D sky wave (@
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
Trang 437 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
40 A typical radio tuner circuit consists of an inductor and capacitor and capacitor
connected in
A paralel B paraleled
C parallel@ D paralleling
UNIT 4: MAKING A RECORD
41.Each vocalist, instrument, or group of instruments linked to a microphone on a mixer or mixing desk
A is @ B are
C were D have been
42.The mixing desk allows the to adjust the recording level for each channel
A computing engineer B telecommunicating engineer
C studio engineer @ D All is correct
43.The instruments are through the mixer into a multitrack tape recorder
A channel B to channel
C be channelled D channelled@)
44.One of the most common effects is reverb (reverberation) which can made the music sound _it was recorded in a very large building or a very small room
A as if@ B as
C if D as far as
45.The _ sound is recorded on a two-track mastering machine to produce a master
tape
A editing B edited@)
C edit D be edited
46.Each instrument using a microphone
A records B recording
C is recorded@ D are recorded
47 The remixed tape to produce a master tape
A is mastered down@ B are mastered down
C is master down D masters down 48 the pits inthe CDs represent the audio pattern
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@
Trang 5
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.V/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
57.Which part of the computer controls the rest of the system and performs all the arithmetic and logic operations on the data?
A CPU@ B ROM
C RAM D data bus
58 The _ only operates while the computer is switched on
A RAM@ B ROM
C CPU D gate
59 CPU is the abbreviation of
A centre processor unit B control program unit
C central program union D central processing unit@
60 What are buses in the computer used for?
A carrying the internal signal between each unit@
B transferring data between all the units
C sending control signals from the CPU to the other unit
D sending signals from the CPU which indicate the memory and I/O locations to be used
61 What is used to transfer data between all the units
A.databus @ B control bus
C address bus D processor bus
62 What is used to send control signals from the CPU to the other unit?
A data bus B control bus@
C address bus D processor bus
Trang 664 65 66 67 68 69 70 71 72 73 74 75 76 77 78
A data bus B control bus
C address bus@ D processor bus
What is used to change AC voltages from small to large or from large to small?
A transformer@ B diode
C resistor D capacity
What is used to measure very small current?
A voltmeter B miliammeter@
C.milimeter D meter
What is used to check the logic level in the pins of ICs?
A VOM B Oscilloscope C logic probe@ D Amp meter
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
What is used for the transmission of RF signal?
A detector B radio set
C aerial @ D receiver
What is used for protecting circuits from surge in voltage?
A Diode B Fuse@
C Resistor D Switch
What is used to master down different recordings to make a master tape? A Microphone B CD
C multi-track recorder D mixer @ What is used to find buried metal?
A Radio B Radar
C detector@ D TV
What is the meaning of prefix semi-?
A haft@ B full
C all D not thing
What is the meaning of prefix de-?
A opposite of B reverse of the action@
C far D across
What is the meaning of prefix dis-?
A opposite of @ B reverse of the action
C far D across
What is the meaning of prefix tele-?
A opposite of B reverse of the action
C far @ D across
What is the meaning of prefix tras-?
A opposite of B reverse of the action
C far D across @
What is the meaning of prefix micro-?
A small @ B many
C big D large
What is the meaning of prefix multi-?
A small B many @
Trang 779 80 81 82 83 84 85 86 87 88 89 90 91 is the digital switching circuit
A logic gate @ B VOM
C delay D CB
is the logic gates whose output depends on the combination of its input
A Flip-Flop B combinational logic@
C.IC D CMOS
is the number of ICs used in a computer
A chip count@ B count chip
C scale of integration D BJT
is an indication of the number of components used in an IC
A chip count B count chip
C scale of integration @ D BJT What is another name for a NOT gate?
A inventor B converter
C inter D inverter@
What are two common families of logic ICs?
A TTL and CMOS @ B BJT and CMOS
C TTL and FET D BJT and FET
TTL is the abbreviation of
A Transistor — Transfer logic B Transistor — transistor Location
C Transistor — Transfer Location D Transistor — transistor Logic@
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
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 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 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
Which logic gate whose output is only high when all its inputs are high?
A OR B AND@
C NAND D NOR
What is shown in an IC pin-out diagram? A The output for all possible inputs
Trang 8C Basic gates D logic symbol
92 use bipolar transistors to form each gate
A.TTLICs @ B CMOS ICs
C BJT ICs D FET ICs
93 use field effect transistors to form each gate
A TTL ICs B CMOS ICs @
C BJT ICs D FET ICs
94 are better for battery-powered portable computers
A TTL ICs B CMOS ICs @
C BJT ICs D FET ICs
95 are suitable for use in large, high speed computers
A.TTLICs @ B CMOS ICs
C BJT ICs D FET ICs
96 What is used to convert electrical signal into visible signal?
A detector B generator C LDR D Oscilloscope@
UNIT 6: REMOTE CONTROL
97 The remote control unit contains keys and electronic components similar to those ofa
A Computer B Calculator @
C mixer D detector
98 The keys by a matrix of wires which cross beneath each individual key A is connected
C are connected @ B are to connected D be connected
99 Almost light is emitted from the LED
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, to the receiver
A micro wave
C infra-red @
signals are sent from the transmitter
B ultra-violet D analogue
102 A code _ by the length and spacing of these pulses switches on the LED
A spelling out
C be spelt out D spelt out @ B spelted out
103 The electrical pulses are converted by the into pulsed infra-red radiation
which is directed at the receiver
A LED @
Trang 9104 The frequency of the oscillator is set by the timing components R1,R2, and Cl
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 trip B tripped C trips @ D would trip
107 Which devices respond to the shock of the glass being broken?
A Radios B vibration sensors @
C pressure mats D magnetic witches
108 are fitted under the carpet-at the bottom of the stairs
A magnetic switch B break detector
C pressure mats @ D motion sensor
109 Why should pressure mats be regularly tested and replaced if necessary? A Because they’re constantly being walked on @
B Because they aren’t constantly being walked on C Because they are easy to be broken
D another reason
110 Motion sensors may use passive infra-red, ultrasonic or microwave energy to
detect within their range
A sound B light
C heat D movement @
111 When light falls on the LDR, its resistance
A decreases @ B decrease
C increases D increase
112 The transistor switches between cut-offand _as the input resistance changes A cut-on B cut-out
C saturation @ D interference
113 A diode is connected in reverse bias across the relay to prevent large back —
A EMF B FME
C electromotive force D A and C are correct @ 114 material is easily magnetized and demagnetized
A magnetic B Ferric
C Ferromagnetic @ D iron
115 The envelope contains , which helps to prevent corrosion of the contacts
A nitrogen @ B hydrogen
C oxygen B water
Trang 10A 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 “Ifan 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
123 The opposite of energize is
A de-energize @ B un-energize C dis-energize D forward-energize 124 The opposite of s/ow is
A fast @ B big C large D small
125 The opposite of forward bias is
A backward bias B reserve bias @
C back bias D up bias
UNIT 8: METAL DETECTOR
126 Despite their technical , metal detector are based on a few very simple
principles
A complexity @ B complex
C easy D combine
127 At fist, metal detectors were developed for military (quan sw) purposes to locate hidden
A metal B rare find
C worthless item D explosive @ (chat nd)
128 Metal detectors operate on the principle of induction A electronic B electromagnetic @
C electrical D magnetic
Trang 11129 Metals are
A semiconductors B not conductors C conductors @ D liquid
130 A coin buried horizontally is to detect than the same coin buried vertically
A harder B easier @
C more harder D more easy
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 (vii khi)
A conceal B concealed (an dau) @
C concealing D be concealed
UNIT 9: CAREERS IN ELECTRONICS
141 We are now the midst of the technological evolution which started with the introduction of the micro chip in the 1970s
A at B in@
C.on D into
142 More and electronic goods are being sold, especially computers, radio telephones, and leisure products
Trang 12A more@ C most
143 Most domestic appliances now A be
C is
B less D the more
some form of electronic control B was
D are@
144 More engineer are _to design, plan, manufacture and install A require
C required @
145 Service engineers are particularly
A on @ C at
146 Aircraft electronic equipment has to
rigorous checks at set intervals A be maintained @
B be maintain
147 LAN is the abbreviation of
A Local Area Network C Large Area Networking
B requiring D be required
demand
B in D onto
to a very high standard with
B maintained D maintaining
B Logical Area Network D Long Area Noun
148 Defense systems require not only engineers to design them, highly-skilled operators to man them and maintain them
A but also
C A and B is correct@ B but 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 intouch 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
152 Recent years have seen a sharp _ _ A increase
C is increase
D expecting
in equipment for patient care
B increased D All is incorrect