Computer Hardware and Software Questions and Answers

Answer: B

Correct answer: 278H

LPT1 uses 378H, LPT2 278H and the monochrome adapter's port 3BCH.

Answer: A

Correct answer: Make sure the printer is on line

A printer with power but no output is most often simply off line, which takes a moment to check and needs no parts. Replacing a fuse or a ribbon addresses faults whose symptoms are different.

Answer: D

Correct answer: turn off computer and boot from a floppy disk

A crash during installation may leave the system files half written, so the machine cannot be trusted to shut down or restart cleanly. Booting from known-good removable media is the way to reach the disk and repair it.

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.

Answer: D

Correct answer: 1

A three-position block has three pins, so a single jumper can bridge either the first pair or the second - two states, representing 0 and 1. The highest value is therefore 1.

Answer: B

Correct answer: It converts mains AC into the low-voltage DC the components need

The power supply unit converts the alternating current from the mains - 230 volts in India - into the low-voltage direct current the components require, chiefly +12 V, +5 V and +3.3 V, delivered through standard connectors. Its capacity is quoted in watts, and it must exceed the total draw of the components, with the graphics card and processor usually accounting for most of it. Efficiency is rated by the 80 Plus scheme, and a more efficient unit wastes less energy as heat. The second option describes an UPS, an uninterruptible power supply, which is a separate external device containing a battery. It provides enough time to save work and shut down cleanly, and also protects against surges and voltage fluctuation. The PSU is a common cause of intermittent faults that look like something else - random restarts and instability under load - because an inadequate or failing unit fails only when demand rises.

Answer: B

Correct answer: It is much faster because it has no moving parts

An SSD stores data in flash memory with no moving parts, so there is no seek time and no rotational delay. Random access in particular is faster by orders of magnitude, which is why replacing a hard disk with an SSD transforms the responsiveness of a computer more than almost any other upgrade. It is also silent, resistant to shock, lower in power consumption and cooler. The other options overstate the case. A hard disk still offers more capacity per rupee, which is why bulk storage and archives remain magnetic. And an SSD does wear: each flash cell tolerates a finite number of write cycles, which is why controllers use wear levelling to spread writes across the drive and over-provision spare cells. Modern drives outlast their usefulness in ordinary use, but the limit is real. Both require power to operate, and both retain data without it.

Answer: A

Correct answer: Access Point

A home network is built around an access point or wireless router, which joins the wired and wireless sides and provides addressing. A NIC belongs to one machine and FireWire is a peripheral bus.

Answer: A

Correct answer: 200

A person begins to feel a static discharge at around three thousand volts, so 200 V passes entirely unnoticed - while being several times what it takes to damage a chip.

Answer: C

Correct answer: The map statement is not in the autoexec.bat file

A mapping made at the command line lasts only for that session. To survive a restart it must be re-established at boot - from AUTOEXEC.BAT, or by ticking reconnect at logon.