Computer Hardware MCQ Questions & Answers | Computer Science

Denatured alcohol is commonly used to clean smudged keys on a keyboard.
It is effective in removing oils, dirt, and grime from keyboard keys without damaging the plastic or rubber components.
TMC solvent and silicone spray are not typically used for cleaning keyboard keys.
An all-purpose cleaner may be too harsh for delicate electronic components and is not recommended for cleaning keyboards.
Therefore, the correct option is denatured alcohol.

ESD (Electrostatic Discharge) would cause the most damage to the Expansion board.
Expansion boards, such as graphics cards, network cards, and sound cards, are particularly vulnerable to damage from static electricity.
When not handled properly, ESD can discharge through these components, causing irreversible damage to sensitive circuits.
While other components like the power supply, monitor, and keyboard can also be affected by ESD, expansion boards are typically more susceptible due to their intricate circuitry and exposed connectors.
Therefore, the correct option is Expansion board.

To view any currently running Terminate Stay Resident (TSR) programs, you could type MEM.
The MEM command in MS-DOS displays information about memory usage, including details about currently loaded TSR programs.
TSR programs remain in memory even after their initial execution and can be viewed using the MEM command.
Options such as SYS /M and Memmaker are not used for viewing currently running TSR programs.
Therefore, the correct option is MEM.

The ML (MicroATX or Mini-ATX) type of system board is the MOST likely candidate for processor upgrading if you want maximum performance and future compatibility.
MicroATX boards are designed to be compact while offering performance and compatibility similar to their larger ATX counterparts.
They often feature modern processor sockets such as Intel's LGA 115x or AMD's AM4, allowing for easy CPU upgrades.
PCI, ISA, and EISA are expansion bus standards and are not directly related to processor compatibility and upgrading.
Therefore, the correct option is ML.

After turning off the power and if the maintenance package identifies several possible field replaceable units (FRUs) that will resolve the problem, you should:
Replace the indicated parts, one at a time in the recommended sequence, until the problem is resolved. This approach helps to systematically identify and address the faulty component without causing additional issues.
Return unused FRUs to stock ensures that unused replacement parts are not wasted and can be used for future repairs.
Option B suggests replacing all indicated FRUs at once, which might not be practical or efficient, especially if only one component is faulty.
Option C mentions replacing the system board first, which may not always be the correct approach and does not address the systematic replacement of components.
Therefore, the correct option is to replace the indicated parts one at a time until the problem is resolved and return unused FRUs to stock.

Most PCs give a single beep on bootup to indicate they are okay hardware-wise. If you boot your PC and don't get a beep, you should check the speaker first.
The absence of the beep could indicate a problem with the speaker itself, preventing it from producing the beep code that signifies normal bootup.
Checking the speaker connections and ensuring it is properly connected to the motherboard or sound card can help diagnose if the lack of beep is due to a faulty speaker.
While issues with the system board, RAM, microprocessor, and power supply can also cause boot problems, the absence of the beep specifically points to a potential issue with the speaker.
Therefore, the correct option is the speaker.

Among the given options, the peripheral port that provides the FASTEST throughput to laser printers is SCSI (Small Computer System Interface).
SCSI offers high-speed data transfer rates and is commonly used for connecting high-performance devices such as laser printers.
While options such as RS-232, Parallel, and Serial ports are also used for printer connectivity, SCSI typically offers faster throughput, making it ideal for laser printers requiring quick data transmission.
Therefore, the correct option is SCSI.

If the mouse pointer moves erratically, a possible cause could be that the ball is dirty.
Traditional mechanical mice use a rubber ball inside to track movement. If this ball becomes dirty, it can cause irregular movement of the mouse pointer.
Cleaning the mouse ball and the internal rollers usually resolves this issue.
Options B, C, and D are less likely causes for erratic mouse movement. A mouse not being connected, driver issues, or incorrect IRQ settings would typically result in the mouse not functioning at all, rather than erratic movement.
Therefore, the correct option is the ball is dirty.

Voltage is measured in series.
When measuring voltage, the voltmeter is connected in parallel with the component or circuit being measured.
In a series circuit, the voltage across each component adds up to the total voltage of the circuit.
Therefore, to measure the voltage accurately, the voltmeter needs to be connected in series

If the print quality of a dot matrix printer is light then dark, improper ribbon advancement could be the cause of the problem.
The ribbon in a dot matrix printer transfers ink onto the paper, and if it advances improperly, it may result in inconsistent ink distribution, leading to variations in print darkness.
Options such