Computer Fundamentals and System Concepts

A Trojan horse (or Trojan) is malicious software that disguises itself as legitimate but doesn't replicate or copy itself unlike worms or viruses. It relies on user deception to execute and then damages the system or compromises security, often creating a backdoor for attackers.

MAC stands for Media Access Control, a protocol that operates at the data link layer of the OSI model. Every network device has a unique MAC address burned into its network interface card (NIC) for identification on a local network.

Tianhe-1A, developed by China's National University of Defense Technology, was the world's fastest supercomputer in 2010 when it was unveiled. It could perform 2.5 quadrillion calculations per second. However, supercomputing rankings change frequently - Japan's K Computer and later systems from the US and China have since claimed the top spot. The question appears to be from around 2010-2011 when Tianhe-1A held the record.

The CPU (Central Processing Unit) is called the 'brain' of the computer because it executes instructions, performs calculations, and coordinates all other components - similar to how a brain controls the body. RAM and ROM are memory types, and the Monitor is an output device.

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.

The Intel 4004, introduced in November 1971, was Intel's first microprocessor and the world's first commercially available single-chip microprocessor. The 8080 came later in 1974, and 8086 in 1978. Option A (3080) is not a real Intel processor.

A motherboard is also called a system board because it's the main printed circuit board that connects all components in a computer. CPU is a component mounted on the motherboard, not another name for it. Fatherboard is not a real term.

Software consists of the instructions, programs, and data that tell the computer what to do and how to do it. Hardware is the physical components, while the processor (CPU) is a hardware component that executes instructions. 'Data flow' is not a standard term for computer instructions - software is the correct term for the programs that control hardware.

A clean computer desktop means having no open programs or windows cluttering the screen, allowing you to focus and find what you need easily. The other options refer to physical cleaning or unrelated concepts like bits of paper on the floor or dusting your area.

A computer requires electrical power to operate. Without power, no components can function. While the CPU processes instructions and the monitor displays output, power is the fundamental requirement that makes the computer operational at all.

In computing, OS is the standard abbreviation for Operating System. An Operating System is the fundamental software that manages computer hardware and software resources, providing services for computer programs. Examples include Windows, macOS, Linux, Android, and iOS.

Linux dominates the supercomputer market, consistently running on over 90% of Top500 systems. The 446 figure reflects actual data from Top500.org listings, where Linux variants power nearly all of the world's fastest supercomputers.

EDSAC (Electronic Delay Storage Automatic Calculator) was a first-generation computer built at Cambridge University in 1949. It used vacuum tubes and mercury delay lines for memory. The other options are from later generations: IBM-1401 (second generation, transistors), CDC-1604 (third generation, integrated circuits), and ICL-2900 (third generation).

First generation computers (1940s-1950s) used vacuum tubes and valves as their primary electronic components. These tubes were bulky, generated significant heat, and were unreliable. Second generation used transistors, while third generation used integrated circuits. The vacuum tube era defined the foundational computing technology.