On the 16-bit ISA bus, IRQ2 is elevated to which higher level Interrupt?
Answer: A
Correct answer: 9
On the 16-bit ISA bus the second interrupt controller is cascaded through IRQ2, so a device requesting IRQ2 is actually serviced as IRQ9. The two are the same line seen from either side.
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Which standard govern parallel communications?
Answer: D
Correct answer: IEEE 1284
IEEE 1284 defines the parallel port, including the bidirectional EPP and ECP modes. RS-232 is the serial standard and CAT 5 a cable specification.
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Dvorak, Colemak and QWERTY are keyboard layouts for which scripts?
Answer: A
Correct answer: Latin Scripts
Dvorak, Colemak and QWERTY are all arrangements of the same set of Latin letters, differing only in where each letter sits. Other scripts have layouts of their own - JCUKEN for Cyrillic, InScript for Devanagari.
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What is the resolution of a monitor measured in?
Answer: B
Correct answer: Pixels
Resolution is the number of pixels a display shows, quoted as width by height - 1920 × 1080 for Full HD, 3840 × 2160 for 4K. A pixel is the smallest addressable point of the image. The distractors each measure something else about a monitor, and the set is worth keeping apart. Hertz measures the refresh rate, how many times a second the image is redrawn - 60 Hz is standard and higher rates give smoother motion. Inches measure the screen size, taken diagonally. Bytes measure data, not display. What actually determines sharpness is neither resolution nor size alone but pixel density, in pixels per inch: the same 1920 × 1080 looks crisp on a 15-inch laptop and coarse on a 32-inch monitor. Aspect ratio is the shape, 16:9 being usual, and response time in milliseconds is how quickly a pixel changes, which matters for fast-moving images.
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How can you totally protect a PC from damage during an electrical storm?
Answer: A
Correct answer: Disconnect the AC power cable
Total protection means no conducting path at all, and only unplugging achieves it. A surge protector clamps a spike but is overwhelmed by a direct strike, and switching off leaves the cable connected.
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What is the largest decimal value that can be represented by a 4-bit binary number ?
Answer: D
Correct answer: 15
Four bits give \(2^4 = 16\) distinct patterns, running from 0 to 15.
\[1111_2 = 8 + 4 + 2 + 1 = 15\]
Answering 16 counts the patterns rather than naming the largest value.
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What is the function of a UPS in a computer system ?
Answer: C
Correct answer: To supply backup power during a mains failure
An Uninterruptible Power Supply carries a battery that takes over the instant mains power fails, giving time for an orderly shutdown. Most also smooth voltage fluctuations, which protects the equipment from surges and sags.
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When measuring AC (Alternating Current) with a multimeter, it is important to maintain the proper polarity.
Answer: B
Correct answer: False
Alternating current reverses direction many times a second, so it has no fixed polarity to observe. Polarity matters when measuring direct current, where reversing the leads reverses the sign of the reading.
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You have just installed a new internal PCI modem on you desktop. It will not dial out. what is the problem?
Answer: D
Correct answer: the phone line out of the wall is plugged into the phone port on the modem
A modem has two identical sockets: line for the wall and phone for a handset. Interchanging them is the classic mistake, and the modem then hears nothing when it tries to dial.
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What can you use to ensure power is not interrupted, resulting in corrupted data?
Answer: A
Correct answer: UPS
Only a UPS supplies power through an interruption; a surge protector deals with the opposite problem, and grounding with a third.
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