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karla3369
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86942
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Updated:
2011-05-20 20:31:04
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comptia
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test questions
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  1. The power supply in the PC is excessively dirty. How
    would you clean it?
    Compressed air
  2. A hard drive should not be:
    formatted before removing from the computer
  3. What is the best method of cleaning a dusty PC
    keyboard?
    Remove the bezel and blow out the dust
  4. What do you use to check for line-voltage
    sags?
    Polarity tester
  5. Which of the following is most likely to cause a problem
    with an unprotected hard disk drive?
    A magnetic field from a large speaker

    X-ray from a nearby monitor

    Solar Winds

    RFI from a nearby TV
  6. Which is not a reason why compressed air is preferred
    over vacuuming for cleaning dust from a circuit board? Choose one:
    • Compressed air can generally provide greater
    • cleaning power

    Compressed air is less likely to cause ESD damage

    Compressed air is less likely to spread dust

    None of the above
  7. Which of the following is most likely to protect a
    personal computer system during an electrical storm?
    • Totally disconnect all cables and power
    • cords

    Use surge suppressers on all AC outlets

    Disconnect the line cords

    Turn the AC power off
  8. What do you use to check for line surges?
    Polarity tester
  9. Which of the following statements are true? Choose
    one:
    • When not being used, a 5-1/4" disk should be kept in
    • its protective sleeve

    • A hard drive should be protected from high magnetic
    • fields

    • A surge suppresser can help to protect a computer installation
    • from high voltage spikes

    • When cleaning PC boards, blowing dust away is preferred over
    • vacuuming

    All of the above
  10. Which of the following should be used to clean the
    external plastic cabinets of computers and their peripherals?
    Acetone

    All purpose spray cleaner

    Damp cloth with a mild detergent

    Wet cloth with a mild detergent
  11. The purpose of a line analyzer is:
    to warn of voltage spikes
  12. Which of the following would make a computer installation
    safer? Choose one:
    An extension cord

    Extra long cables

    A switch box

    Surge suppressers
  13. The hard drive makes a grinding noise. The cause is
    probably:
    HDI (Head-to-Disk Interface)

    a faulty SCSI connection

    a software crash

    a dirty read/write head
  14. During the POST, what does a single beep
    indicate?
    Normal operation of the PC
  15. Which of the following is NOT considered to be a field
    replaceable unit (FRU)?
    CPU chip

    Co-processor

    SIMM

    Power supply regulator
  16. During what process do you tell the PC the types of
    drives being used?
    CHKDSK

    POST

    SETUP

    PREP
  17. Diagnostics indicate that you have several bad field
    replaceable units (FRUs). What do you do?
    Replace the motherboard

    • Replace the indicated FRUs one at a time, rerunning the
    • diagnostics after each replacement

    Replace all FRUs that were identified as bad

    Investigate further to determine if the software is at fault
  18. Which of the following would most likely result in the
    mouse pointer NOT being displayed when you switch from DOS applications to
    Windows applications?
    A faulty mouse

    A faulty serial interface

    Wrong mouse driver in the CONFIG.SYS file

    Wrong mouse driver in the SYSTEM.INI file
  19. During what process do you tell the PC the amount of
    conventional or extended memory being used?
    SETUP

    POST

    Boot up

    PREP
  20. Which of the following is least likely to be a field
    replaceable unit?
    A board that plugs into the ISA bus

    A socketed integrated circuit

    A surface-mounted integrated circuit

    A battery
  21. Which of the following components will hold a charge even
    though power has been removed?
    Diode

    Transistor

    Capacitor

    Rectifier
  22. A multimeter is set up to DC, Ohms, and 20k. How would a
    good 4-ampere fuse measure?
    0.00

    0.04

    0.40

    4.00
  23. A multimeter is set up to DC, Ohms, and 20k. How would a
    bad 4-ampere fuse measure?
    0.00

    Infinitely high

    0.04

    4.00
  24. The farad is the basic unit of measurement
    for:
    resistors

    inductors

    capacitors

    FETs
  25. A circuit board in a computer can be destroyed by
    voltages as low as:
    100 volts

    200 volts

    1000 volts

    30 volts
  26. What should an ordinary household wall outlet
    measure?
    12 volts DC

    104-130 volts DC

    104-130 volts AC

    210-250 volts AC
  27. Which of the following can be caused by power source
    (electric company and building wiring) problems?
    Random memory errors




    Damaged components inside the computer

    Hard disk errors

    Computer occasionally locks up

    All of the above
  28. Which of the following voltage levels would you not
    expect to find at the output of a typical personal computer power supply? Choose
    one:
    +24 V




    +12 V

    +5 V

    -5 V

    -24 V
  29. Which of the following voltages is NOT normally present
    at the output of a personal computer power supply?
    +5 V

    -5 V

    +12 V

    -12 V

    120 V
  30. The wires coming from the power supply in a personal
    computer are color coded to specify their purpose. What color are the ground (or
    common) wires?
    Red

    Black

    Yellow

    Blue
  31. Ohms is the basic unit of measurement for:
    resistors
  32. What is the basic unit of measurement for
    resistors?
    Ohms
  33. What voltage should you measure on the yellow wires
    coming from the power supply in a personal computer?
    +5 volts

    -5 volts

    +12 volts

    -12 volts
  34. Which of the following best describes a standby power
    supply?
    • It uses an isolation transformer to remove AC line
    • noise

    • It uses metal oxide varistors (MOVs) to protect against AC line
    • spikes

    • It consists of a battery connected between the AC line and the
    • computer. The AC line charges the battery, and the battery supplies power to the
    • computer

    • It consists of a battery connected between the AC line and the
    • computer. The AC line simultaneously charges the battery and supplies power to
    • the computer. When the AC line voltage is lost, the battery quickly switches so
    • it, instead the AC line, powers the computer
  35. What is the basic unit of measurement of
    capacitors?
    Farads

    Ohms

    Volts

    Amperes
  36. Which of the following does not provide surge protection?
    Choose one:
    A power conditioner

    A standby power supply (SPS)

    An uninterruptible power supply (UPS)

    None of the above
  37. The best uninterruptible power supplies (UPS) and standby
    power supplies (SPS) produce which of the following output waveforms?
    Sine waves

    Square waves

    Stairstep waves

    Sawtooth waves
  38. Which of the following is the smallest power interruption
    that can cause memory errors or the computer to lock up?
    1 second

    1/200 second

    10 seconds

    1 minute
  39. If a power supply has "watts capacity" rating of 200,
    what does this mean?
    The power supply uses up 200 watts

    • The power supply always produces 200 watts. Therefore, the load
    • you attach must be able to use up this much power

    • This is the minimum amount of power the supply can
    • provide

    The power supply can provide up to 200 watts
  40. When measuring an unknown voltage
    • start with the meter set to its highest
    • range

    • remove power until the meter is connected to the
    • circuited

    start with the meter set to its lowest range

    set the meter to the Ohms function
  41. When using an ohmmeter:
    • remove power to the circuit before attaching the
    • meter

    • you must physically break the circuit to insert the
    • ohmmeter

    • connect the meter in series with the component being
    • measured

    power must be applied to the circuit under test
  42. Which of the following rules do not apply when using a
    multimeter?
    • Resistance is measured with the ohmmeter with all
    • circuit power off

    • When measuring current or voltage, if you are unsure which range
    • to use, start with the highest range and work down

    • Current and voltage are measured across the component with the
    • power applied

    • When measuring current, turn off the power, break the current
    • path to be measured, connect the meter in series with the current path, and
    • reapply power
  43. A new external modem does not work properly. Which of the
    following should be checked? Choose one:
    The connections of the RJ-11 cable

    The serial port settings

    • The communications parameters such as speed, parity, data bits,
    • and stop bits

    • The communications software to make sure it is compatible with
    • the modem

    All of the above
  44. The mouse works in MS-DOS but not in Windows 3.1. What do
    you do?
    Check for the proper mouse driver in the SYSTEM.INI file
  45. You replaced your customer's motherboard. Before
    returning the unit to the customer, what should you do?
    Run SETUP
  46. A customer calls with a printer problem. What information
    should you gather first?
    • Company name, customer name, type of computer, type
    • of printer, the time at which he can bring the product in for service

    • Customer name, Company name, type of printer, nature of the
    • problem

    • Where the printer was purchased, name of company, customer
    • name

    • Customer name, Company name, Company address, time at which it
    • would be most convenient for you to pick up the printer
  47. You replace a faulty motherboard. Before returning the
    computer to the customer, you should:
    run SETUP and setup the configuration
  48. Which of the following is least likely to be affected by
    a virus?
    Floppy disk




    Hard drive




    BIOS in ROM




    A file in RAM
  49. Computer viruses are most likely to be spread
    via:
    on-line services




    pirated games software




    licensed application programs




    licensed operating systems
  50. Which of the following is not a recommended way to
    minimize damage caused by a computer virus?
    Frequently running a virus checker program




    Frequently formatting your hard drive




    Frequently backing up your data




    Avoiding pirated software
  51. A PC virus is least likely to attach itself
    to:
    a data file




    the boot sector of your hard disk




    a .COM file




    a .EXE file
  52. Which MS-DOS files are concerned with viruses?
    MSAV, VSAFE, and MWAV




    VER, CHKDSK, and SCAN




    SCANDISK and CHKVIR




    DMDRVR and FINDVIR
  53. A virus is detected and successfully removed from a
    customer's PC. What additional action should be taken to prevent
    re-infection?
    • Destroy all floppy disks that have been used
    • recently on the PC




    • Scan all floppy disks that have been used recently on the
    • PC




    Disconnect the PC from the network




    Reformat the hard drive on the PC
  54. Which of the following files is most likely to harbor a
    virus?
    COMMAND.COM




    TEXTFILE.DOC




    SALES99.XLS




    IMAGE.BMP
  55. Which of the following statements about PC viruses is not
    true?
    • The PC is infected only if it boots (or attempts to
    • boot) from an infected disk; or if it executes an infected program




    Viruses are not carried by PC data files




    Some viruses reside in boot sector files




    • The PC can not be infected by attempting to boot from a
    • non-bootable floppy
  56. What is the best ground to use when working on a personal
    computer?
    Chassis




    Common




    AC outlet ground




    Computer
  57. When should you not wear a wrist band ground
    strap?
    When working on a disk drive




    When working on a CPU




    When working on memory




    When working around an exposed cathode ray tube (CRT).
  58. Once an IC is mounted on a circuit board it
    is:
    • not susceptible to ESD damage if the board is not
    • installed in the PC




    still susceptible to ESD damage




    • not susceptible to ESD damage if the board is properly installed
    • in the PC




    • not susceptible to ESD damage as long as the computer is turned
    • off
  59. Which of the following could generate electrostatic
    voltages high enough to cause ESD damage? Choose one:
    Combing your hair




    Walking across a carpeted floor




    Taking off your coat




    Any one of the above
  60. When shipping a board from one place to another, to avoid
    ESD damage, the board should be:
    placed inside an anti-static bag




    grounded at all times




    kept in high humidity environment




    sprayed with antistatic spray before packing
  61. When you use the computer chassis for ground, what should
    you do?
    • Keep the line cord plugged into an AC
    • outlet




    Disconnect the line cord




    Disconnect all test equipment from ground




    Do not wear a wristband ground strap
  62. Which of the following techniques is the best way to
    prevent ESD damage?
    • Wear a properly connected ESD wrist strap when you
    • work on microcomputer equipment




    Work in a high humidity area




    Work in a non-carpeted area




    Handle circuit boards only by the edges
  63. Which of the following types of mat will reduce static
    electricity problems?
    Nylon




    Plastic




    Rubber




    Vinyl
  64. Why is it NOT a good idea to wear a wrist band ground
    strap when working around an exposed cathode ray tube (CRT)? Choose
    one:
    A CRT is like a big capacitor




    • A CRT maintains a high charge even when disconnected from the
    • circuit




    • Wearing a ground strap increases your chances of accidental shock
    • from the CRT




    All of the above
  65. Which of the following devices will reduce the risk of
    ESD?
    Line analyzer




    Waveform generator




    Ion generator




    White noise generator
  66. Which of the following semiconductors is most susceptible
    to electrical noise and ESD?
    TTL




    FET




    CMOS




    DTL
  67. Why should you keep the AC line cord plugged in if you
    are using the computer chassis as your source of ground?
    • Because the computer must have power applied to
    • safely swap components




    • Because the computer must have power applied during all
    • tests




    To ensure that the computer chassis is at earth ground




    • Because this eliminates any possibility that you will receive an
    • accidental electrical shock
  68. A wrist grounding strap contains a:
    resistor




    capacitor




    transistor




    diode
  69. Why is a CMOS memory chip more susceptible to ESD damage
    than its earlier TTL counterpart?
    The CMOS chip uses a higher voltage




    • The dimensions of the transistors in CMOS are much
    • smaller




    Field effect transistors are impervious to ESD




    Bipolar transistors are impervious to ESD

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