A pen shaped device which can sense light, and is used to point at spots on a video screen.
Answer: B
Correct answer: Light pen
A light pen is held against the screen and its photocell detects the instant the scanning beam passes beneath it; from the timing the system works out which point was touched. It was the standard way of pointing at a spot on a display before the mouse became common.
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One million bytes of information are ?
Answer: A
Correct answer: 1 MB
One megabyte is about a million bytes - \( 10^6 \) bytes in decimal reckoning, or \( 2^{20} = 1{,}048{,}576 \) bytes when counted in the binary units the memory system uses. A kilobyte is a thousand times smaller and a gigabyte a thousand times larger.
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What is the full form of ALU in a computer’s central processing unit ?
Answer: D
Correct answer: Arithmetic Logic Unit
The Arithmetic Logic Unit performs the arithmetic and logical operations of the processor. It works alongside the control unit, which fetches and decodes instructions, and the registers, which hold the operands.
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ASCII stands for
Answer: A
Correct answer: American standard code for information interchange
ASCII is the American Standard Code for Information Interchange, a 7-bit code giving \( 2^7 = 128 \) values - the letters, digits, punctuation and control characters. Its universality is what allows text written on one machine to be read on another.
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Which of following is not an application software ?
Answer: B
Correct answer: Winrar
Photoshop, SAGE and Dreamweaver are applications: they do work the user wants done - editing images, keeping accounts, building web pages. WinRAR compresses and extracts archives, which is housekeeping on the machine itself, so it is classed as a utility.
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The term referring to evacuating the content of some part of the machine is known as
Answer: A
Correct answer: Dump
A dump writes out the contents of memory, or of some part of the machine, so that its state can be examined - usually after a failure, so the cause can be traced. The word describes emptying the contents out for inspection, not altering them.
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Set of instructions which instructs computer to perform certain task is called ?
Answer: C
Correct answer: Program
A program is a set of instructions written to make the computer perform a particular task. An assembler and a debugger are themselves programs with special jobs, and a flowchart is a diagram of the logic rather than something the machine can execute.
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A section of code to which control is transferred when a processor is interrupted is known as
Answer: A
Correct answer: SVC
An SVC - supervisor call - is the routine the processor transfers control to when an interrupt occurs: the current instruction stream is suspended, the machine switches to supervisor state and enters that handler, which services the condition and then returns. IP is the instruction pointer and MDR the memory data register - both registers, not sections of code.
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Symbolic languages were developed in
Answer: B
Correct answer: 1950
Symbolic - assembly - languages appeared around 1950, when programmers began replacing raw binary operation codes with mnemonics and addresses with symbolic labels, and wrote assemblers to translate them. High-level languages such as FORTRAN followed later in the decade.
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Which is the extension of a batch file ?
Answer: A
Correct answer: .bat
A batch file is a plain-text list of DOS or Windows commands executed in order, and it carries the extension .bat (or .cmd on later versions of Windows). The .exe extension belongs to compiled programs.
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