Computer Fundamentals and System Concepts

A polymorphic virus changes its code structure each time it infects a new file, making it difficult for antivirus software to detect through signature-based methods. The other options describe different types of malicious programs: B is a worm, C is a Trojan horse, and D describes a stealth virus technique.

ROM stands for Read-Only Memory, which is a type of computer memory that permanently stores data and cannot be modified after manufacture. It's used to store firmware and software that needs to be permanently available. The other options (SVP, TNT, NTP) are not standard computer acronyms.

A computer virus is a type of malicious software (malware) that, when executed, replicates itself by modifying other computer programs and inserting its own code. The option stating it destroys software is the closest to being correct among the choices, though it's an oversimplification - viruses primarily replicate and may cause damage as a side effect. Viruses do not destroy hardware (A), are not necessarily email-based (C), and option D is incorrect since B is partially correct.

In the DIKW hierarchy (Data, Information, Knowledge, Wisdom), 'Information' is defined as processed, organized, or structured data that provides context and meaning. Data is raw facts without context. Software is a program. A computer is hardware. Information is the correct answer.

The Control Unit (CU) is a component of the CPU that directs the operation of the processor. Its primary function is to decode program instructions (convert them into control signals) and coordinate the activities of other CPU components. The ALU performs logical/mathematical operations, not the CU.

The Harvard Mark I (IBM ASCC) was the first automatic digital computer to successfully perform long sequences of arithmetic and logical operations without human intervention (completed in 1944). 'Analytic' refers to Babbage's never-built Analytical Engine. Mainframe is a category, not a specific machine. UNIVAC-I came later (1951).

Language translators (assemblers, compilers, and interpreters) convert programs written in high-level languages or assembly language into machine code that the computer can execute. These are essential system development programs. Performance monitors analyze system performance, operating systems manage computer resources, and DBMS manages databases - none are primarily development tools.

Digital computers operate on the counting principle, processing data as discrete numerical values (binary digits 0 and 1). Unlike analog computers that measure continuous physical quantities, digital computers count and process binary digits. This counting-based operation is fundamental to how digital circuits process information using binary logic.

Modern digital computers are characterized by high speed, large memory capacity, and high accuracy in calculations. The question asks which feature modern computers have, and since they possess all these capabilities, 'all of the above' is the correct choice. High speed enables rapid processing, large memory allows storage of vast amounts of data, and digital accuracy ensures precise computations.

Mainframe computers are designed for high-volume transaction processing and can execute billions of operations per second. Modern mainframes like IBM z Systems can indeed perform over a billion operations per second, making option D the correct answer. The other options (1, 1,000, and 100,000) are orders of magnitude too low for contemporary mainframe capabilities.

This component of Windows operating system displays the moving images that start automatically when the computer is idle.

ZTRON is not a recognized computer term. The other options are all valid: D-BASE was a popular database management system, RAM is Random Access Memory (essential computer memory), and FORTRAN is a programming language for scientific computing. This question tests knowledge of real versus fabricated computer terminology.

The Abacus, dating back to around 2400 BC in Mesopotamia, is widely considered the earliest known computing device used for arithmetic calculations. Mark I (1937), IBM-753 (modern), and Mac (1980s) are all much more recent inventions.

CPU stands for Central Processing Unit - the primary component of a computer that executes instructions. It's called 'central' because it's the core component, and 'processing' because it processes data and instructions.