121.
Resistance is measured in units of:
Answer: A
Correct answer: ohms
Resistance is measured in ohms; farads measure capacitance and amperes current.
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Computer Hardware and Software Questions and Answers
122.
Teletypewriter terminal is an example of
Answer: C
Correct answer: input/output devices
A teletypewriter both accepts typed input and prints output, so it works in both directions - which is why it was the standard console of early computers.
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123.
Which best describes a fragmented hard drive:
Answer: D
Correct answer: Files are not stored in consecutive clusters
Fragmentation is a matter of layout, not of damage: as files are created and deleted, a new file is written into whatever gaps exist, so its clusters end up scattered and the head must seek between them.
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124.
Voltage is measured:
Answer: A
Correct answer: in parallel
Voltage is a difference between two points, so the meter is placed across the component, in parallel with it, and the circuit need not be broken. Current is what requires the circuit to be opened and the meter placed in series.
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125.
Which of the following items would require you t.o comply with EPA disposal guidelines?
Answer: D
Correct answer: Battery
Batteries contain heavy metals and must be disposed of under environmental regulations rather than thrown away. Keyboards, boards and supplies are ordinary electronic waste.
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126.
In Inkjet technology the droplets of ink are deflected by?
Answer: A
Correct answer: multi directional nozzles
In a drop-on-demand inkjet the position of each drop is fixed by which nozzle fires; the head is moved across the page and the paper advanced. Charged deflection plates belong to continuous inkjet printing, which is used industrially rather than in desktop printers.
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127.
The POST routine, which counts system board RAM first, is stored in:
Answer: C
Correct answer: ROM BIOS
The power-on self test runs before anything has been loaded from disk, so it must already be present in firmware - the ROM BIOS. CMOS holds settings, not code.
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128.
Which should you use for cleaning Mylar-protected LCD screens?
Answer: B
Correct answer: Non-abrasive cleanser
An LCD's Mylar coating is soft and is attacked by ammonia and by alcohol, both of which cloud it permanently. Only a mild non-abrasive cleaner on a soft cloth is safe.
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129.
Which controller would support an external CD-ROM drive?
Answer: D
Correct answer: SCSI
SCSI is designed for external devices: it carries its own bus off the back of the machine and can address several devices on one cable. ESDI, MFM and ARLL are internal disk interfaces.
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130.
What does SMPS stand for in a computer ?
Answer: A
Correct answer: Switched Mode Power Supply
An SMPS converts mains alternating current into the several direct-current voltages a computer needs, switching rapidly rather than dissipating the excess as heat. That switching is why it is far more efficient and lighter than a linear supply.
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