Disk Operating System (DOS) was designed to work with which of the following input device ?
Answer: D
Correct answer: Keyboard
DOS presents a command-line prompt: the user types a command, presses Enter, and reads the reply as text. The whole interface is built around the keyboard; there is no pointer to move, so a mouse was only ever an optional extra used by individual programs.
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A process of preparing a floppy diskette for use is called _______________
Answer: B
Correct answer: formatting
Formatting writes the track and sector structure onto a blank diskette and lays down the directory and allocation table, so the operating system knows where it may put files. Until that is done the surface carries no organisation and nothing can be stored on it.
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RAM is used as a short memory because it is
Answer: A
Correct answer: Volatile
RAM is volatile: its contents last only while power is applied and vanish the moment the machine is switched off. That is why it serves as short-term working memory and why anything to be kept must be written to disk.
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The section of the CPU that selects, interprets and sees to the execution of program instructions
Answer: C
Correct answer: Control unit
The control unit selects the next instruction, decodes it, and issues the signals that make the ALU, registers, memory and input/output units carry it out. The ALU performs the arithmetic it is directed to, and registers and memory simply hold values.
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WWW stands for ?
Answer: B
Correct answer: World Wide Web
WWW stands for the World Wide Web - the system of hyperlinked documents that Tim Berners-Lee proposed in 1989, delivered over the internet by HTTP and addressed by URLs. The web is one service that runs on the internet, not the internet itself.
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The list of coded instructions is called
Answer: A
Correct answer: Computer program
A computer program is the list of coded instructions the machine executes. An algorithm is the method it implements, expressed independently of any language, and a flowchart is a picture of that method - neither can be run.
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CD–ROM is a kind of?
Answer: C
Correct answer: Optical disk
A CD-ROM stores data as pits and lands pressed into a reflective layer and reads them with a laser beam, so it is an optical disk. Magnetic disks record by magnetising a coating and read it with a head, and a magneto-optical disk combines both techniques - a laser to heat the spot, a magnetic field to write it.
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Page stealing
Answer: B
Correct answer: is taking page frames from other working sets
Page stealing is the memory manager taking a frame away from one process’s working set to satisfy another’s page fault. It is a sign that memory is over-committed, not that the system is well tuned, and it leads to thrashing if it goes far enough.
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Which of the following systems software does the job of merging the records from two files into one?
Answer: B
Correct answer: Utility program
Merging the records of two files into one is routine housekeeping on data, and that is the province of a utility program - the sort, merge, copy and backup programs supplied with the system. Security and networking software serve other purposes entirely.
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Which language is related to database ?
Answer: B
Correct answer: Sql
SQL - Structured Query Language - is the standard language for relational databases: it defines tables, and inserts, updates, deletes and queries the rows in them. Perl, PHP and Java are general-purpose programming languages that may send SQL to a database.
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