What is the name of the operating system that reads and reacts in terms of actual time
Answer: C
Correct answer: Real time system
A real-time system must respond within a deadline set by the process it controls, because a correct answer that arrives late is useless - the world has moved on. Batch and time-sharing systems aim at throughput and fair response instead, with no guaranteed deadline.
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What is the name given to the software which can be legally compiled and often used for free?
Answer: B
Correct answer: Public domain program
A public domain program carries no copyright restriction, so anyone may compile, use, change and redistribute it freely. Shareware is copyrighted and may be tried before purchase but must then be paid for, and firmware describes where a program is stored rather than its licence.
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Process is
Answer: C
Correct answer: a program in execution
A program is a passive file of instructions on disk; a process is that program actually running, with a program counter, registers, a stack, its own address space and an entry in the process table. One program may have several processes running from it at once.
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Which among the following Windows do not have Start button
Answer: C
Correct answer: Windows 8
Windows 8 dropped the Start button from the desktop taskbar, replacing the Start menu with the full-screen Start screen - a change so unpopular that Windows 8.1 restored the button and Windows 10 restored the menu. Vista and 7 both have it.
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Which of the following capabilities is required for a system program to execute more than one program at a time?
Answer: D
Correct answer: multitasking
Running more than one program at a time requires multitasking: the system must hold several programs, keep the state of each, and switch the processor between them quickly enough that all appear to advance together. Virtual memory helps by letting them all be resident, but it is the switching that makes concurrency.
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What problem is solved by Dijkstra's banker's algorithm?
Answer: C
The Banker's algorithm is a resource allocation & deadlock avoidance algorithm developed by Edsger Dijkstra that tests for safety by simulating the allocation of pre-determined maximum possible amounts of all resources, and then makes a "safe-state" check to test for possible deadlock conditions for all other pending activities, before deciding whether allocation should be allowed to continue
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Object modules generated by assemblers that contain unresolved external references are resolved for two or more object modules by a/an
Answer: C
Correct answer: linker
Each object module lists the symbols it defines and the external ones it refers to. The linker gathers the modules, matches every reference to a definition, adjusts the addresses accordingly, and produces a single load module. The loader then places that module in memory.
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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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