What should you replace if the brightness or contrast adjustments were malfunctioning on a laptop?
Answer: B
Correct answer: led display
Brightness and contrast on a laptop are properties of the backlight and panel, so a fault that survives the adjustment is in the display assembly itself rather than in the switch or the fuse.
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One of the major components of a PC is the Central Processing Unit (CPU) which can be best described as:
Answer: D
Correct answer: The area where all of the processing takes place
The CPU fetches and executes the instructions, which is what processing means. Driving the monitor is the video card's work and regulating power the supply's.
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On a leased line installation a known good external modem shows no carrier detect light. Where is the problem most likely to be?
Answer: B
Correct answer: In the phone line
Carrier detect is the modem's report that it can hear the far end. A modem known to be good that sees no carrier is being told, correctly, that nothing is arriving - so the fault is on the line.
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What IRQ is used for COM 2?
Answer: B
Correct answer: 3
COM1 and COM3 share IRQ4; COM2 and COM4 share IRQ3. That sharing is why two devices on the even-numbered ports conflict.
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What is the size of the reserved memory area?
Answer: B
Correct answer: 384 kb
The first megabyte of a PC's address space is divided into 640 KB of conventional memory and the 384 KB above it reserved for video buffers, adapter ROMs and the system BIOS:
\[ 1024 - 640 = 384\ \text{KB} \]
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Which would you have to upgrade to install an EIDE drive?
Answer: C
Correct answer: Controller board
EIDE adds larger drive support, faster transfer modes and a second channel, none of which an older IDE controller provides. The CPU and the motherboard bus need not change.
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Dust in a computer actually increases the size of the magnetic fields inside it. This is not good, so you must occasionally dust, I trust. What's the best way to do this?
Answer: D
Correct answer: non-static compressed air
Compressed air blows dust out without touching anything and without generating charge. An ordinary vacuum builds a static charge at its nozzle, and breath carries moisture.
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A parity error usually indicates a problem with:
Answer: A
Correct answer: memory
The parity bit is written with each byte and checked on every read, so a mismatch means the stored data has changed. That is a memory fault by definition.
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What is the i/o address for com1?
Answer: D
Correct answer: 3f8
The standard serial addresses are COM1 at 3F8, COM2 at 2F8, COM3 at 3E8 and COM4 at 2E8.
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The monitor power LED is 'on' but the monitor screen is completely dark. The least likely cause of the problem is:
Answer: D
Correct answer: System RAM problem
A memory fault stops the machine before it gets far, but the display would still show the POST error. The three plausible causes all lie in the video path itself - card, cable or monitor.
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