Tag: science & technology

One Megabyte (MB) equals approximately one million bytes (precisely 1,048,576 bytes in binary, or 1,000,000 in decimal). The question asks for an approximation, and 'one million' is the commonly used figure. A thousand bytes is a Kilobyte, not Megabyte.

A modem (modulator-demodulator) enables computers to transmit data over telephone lines by converting digital signals to analog and back. CD-ROM drives read optical discs, RAM is memory, and hard drives store data - only the modem provides telephone-line connectivity.

ISA, PCI, and AGP are all types of motherboard expansion slots that accept expansion cards. ATX is a motherboard form factor (specifying size, layout, and mounting hole positions), not an expansion slot type.

COM1 (the first serial port) traditionally uses IRQ 4 on PC systems. COM2 uses IRQ 3, while IRQ 6 is for floppy controller, and IRQ 7 is for printer port (LPT1). These IRQ assignments are part of the standard PC architecture.

Software consists of the instructions, programs, and data that tell the computer what to do and how to do it. Hardware (like mouse and printer) are physical components, while software is the code that controls them.

Parity is an error-checking system where an extra bit is stored with each byte of data in RAM. This bit is set so that the total number of 1s in the byte (including parity) is always even or odd. When data is read back, the parity bit is recalculated - if it doesn't match, an error is detected.

RJ-11 is the standard connector used for telephone lines. It has 4-6 pins and is the small plastic plug found in phone jacks. RJ-45 is larger and used for Ethernet networks, while COM1 is a serial port designation, not a physical connector type.

The hard drive provides permanent (non-volatile) storage for files. When you save a file, it's written to the hard disk's magnetic surface and persists even after power is turned off. RAM is temporary storage that loses data when power is cut, the CPU processes data, and the monitor only displays it.

Mouse, keyboard, and scanner are all input devices - they send information TO the computer. Monitor and printer are output devices (display or produce information), and CPU is a processing component that executes instructions, not an input device.

Earth is the densest planet in our solar system with an average density of about 5.51 g/cm³, which is primarily due to its large iron-nickel core. This is significantly higher than other planets: Mercury (5.43 g/cm³) is close but smaller, while gas giants like Jupiter and Neptune have much lower densities due to their gaseous composition.