While working with MS-DOS, which command is used to display a list of deleted files that DOS can undelete?
Answer: C
Correct answer: UNDELETE/LIST
UNDELETE /LIST shows which deleted files DOS can still recover, without recovering any of them - a look before you commit. UNDELETE with a file specification does the recovering.
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Which command will be used to display file and directory names only, without size, date, and time information?
Answer: C
Correct answer: DIR/B
The /B (bare) switch lists names alone, with no heading, no size, date or time, and no summary line - which is what makes it useful for piping into another command or capturing to a file. /W gives a wide listing and /S descends into subdirectories.
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The action of parsing the source program into the proper syntactic classes is known as
Answer: B
Correct answer: lexical analysis
Lexical analysis is the first phase: it scans the source character by character and groups the characters into tokens - identifiers, keywords, constants, operators - classifying each. Syntax analysis then takes that stream of tokens and checks it against the grammar of the language.
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Which command of DOS is used to sort the file in reverse order?
Answer: C
Correct answer: SORT/R < filename
The /R switch makes SORT order the lines in reverse, and the file is fed in with < because SORT is a filter that reads standard input.
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Scissoring enables
Answer: A
Correct answer: a part of data to be displayed
Scissoring, or clipping, discards the parts of a picture that fall outside the window, so only the portion inside is drawn. It is what lets a small viewport show a region of a much larger drawing without the rest spilling across the screen.
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Which of the following is true about pseudocode
Answer: D
Correct answer: None of the above
Pseudocode is not a programming language at all: it is a notation for writing an algorithm in a mixture of structured English and code-like constructs, so the logic can be set out and reviewed. No compiler accepts it, and it must be rewritten in a real language before it can run.
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Which of the following, is necessary to work on a computer
Answer: B
Correct answer: Operating system
Without an operating system nothing can manage the processor, memory, files and devices, so no other program - including a compiler or an interpreter - can be loaded or run. Translators are needed only if you intend to write programs.
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If you do not know the current time, which command will you use to display the time?
Answer: C
Correct answer: TIME
TIME displays the current time and offers to change it; typed with a value it sets the clock directly. DATE does the same for the date.
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Which of the following filename extension suggests that the file is a backup copy of another file?
Answer: D
Correct answer: BAK
The extension .BAK marks a backup copy, written automatically by many programs before they overwrite the original, so the previous version can be recovered. TXT holds text, COM an executable, and BAS a BASIC source file.
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A compiler for a high-level language that runs on one machine and produces code for a different machine is called is
Answer: C
Correct answer: cross compiler
A cross compiler runs on one machine but generates code for another, which is how software is built for a target too small to host a compiler - an embedded processor or a new machine that does not yet run anything. Optimising, one-pass and multipass describe how a compiler works, not what it targets.
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