Operating System MCQs > FREE SET - 5

	1. Operating system is
	A A collection of hardware components B A collection of input-output devices C A collection of software routines D All of the above Free MCQs www.sharemcq.com     Answer: Option C Explanation: Available Soon. Workspace View Answer Workspace

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	2. The Operating system manages
	A Memory B Processor C Disks and I/O devices D All of the above Free MCQs www.sharemcq.com     Answer: Option D Explanation: Available Soon. Workspace View Answer Workspace

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	3. A linker
	A creates a load module B is not necessary with variable partitions C must be run after the loader D is not needed with a good compiler Free MCQs www.sharemcq.com     Answer: Option A Explanation: Available Soon. Workspace View Answer Workspace

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	4. The primary job of the operating system of a computer is to
	A command resources B manage resources C provide utilities D be user friendly Free MCQs www.sharemcq.com     Answer: Option B Explanation: Available Soon. Workspace View Answer Workspace

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	5. System maintenance:
	A is usually not necessary B is necessary on all systems, regardless of how good C is not required if the system is well written D always requires several programs Free MCQs www.sharemcq.com     Answer: Option B Explanation: Available Soon. Workspace View Answer Workspace

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6. Which of the following statements is false?

A a process scheduling algorithm is preemptive if the CPU can be forcibly removed from a process B time sharing systems generally use preemptive CPU scheduling C response time are more predictable in preemptive systems than in non preemptive systems D real time systems generally use non-preemptive CPU scheduling Free MCQs www.sharemcq.com     Answer: Option D Explanation: Available Soon. Workspace View Answer Workspace

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	7. Daisy chain is a device for
	A connecting a number of controllers to a device B connecting a number of devices to a controller C interconnecting a number of devices to a number of controllers D all of the above Free MCQs www.sharemcq.com     Answer: Option B Explanation: Available Soon. Workspace View Answer Workspace

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	8. The operating system of a computer serves as a software interface between the user and
	A hardware B peripheral C memory D screen Free MCQs www.sharemcq.com     Answer: Option A Explanation: Available Soon. Workspace View Answer Workspace

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	9. A relationship between processes such that each has some part (critical section) which must not be executed while the critical section of another is being executed, is known as
	A semaphore B mutual exclusion C multiprogramming D multitasking Free MCQs www.sharemcq.com     Answer: Option B Explanation: Available Soon. Workspace View Answer Workspace

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	10. A public key encryption system
	A allows anyone to decode the transmission B allows only the correct sender to decode the data C allows only the correct receiver to decode the data D does not encode the data before transmitting it Free MCQs www.sharemcq.com     Answer: Option C Explanation: Available Soon. Workspace View Answer Workspace

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	11. If you want to execute more than one program at a time, the systems software you are using must be capable of
	A word processing B virtual memory C compiling D multitasking Free MCQs www.sharemcq.com     Answer: Option D Explanation: Available Soon. Workspace View Answer Workspace

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12. Multiprogramming

A is a method of memory allocation by which the program is subdivided into equal portions, or pages and core is subdivided into equal portions or blocks. B consists of those addresses that may be generated by a processor during execution of a computation. C is a method of allocating processor time. D allows multiple programs to reside in separate areas of core at the time. Free MCQs www.sharemcq.com     Answer: Option D Explanation: Available Soon. Workspace View Answer Workspace

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	13. The action of parsing the source program into the proper syntactic classes is known as
	A syntax analysis B lexical analysis C interpretation analysis D general syntax analysis Free MCQs www.sharemcq.com     Answer: Option B Explanation: Available Soon. Workspace View Answer Workspace

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	14. In which addressing mode the contents of a register specified in the instruction are first decremented, and then these contents are used as the effective address of the operands?
	A index addressing B indirect addressing C auto increment D auto decrement Free MCQs www.sharemcq.com     Answer: Option D Explanation: Available Soon. Workspace View Answer Workspace

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	15. Inter-process communication
	A is required for all processes B is usually done via disk drives C is never necessary, D allows processes to synchronize activity Free MCQs www.sharemcq.com     Answer: Option D Explanation: Available Soon. Workspace View Answer Workspace

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	16. The part of machine level instruction, which tells the central processor what has to be done, is
	A Operation code B Address C Locator D Flip-Flop Free MCQs www.sharemcq.com     Answer: Option A Explanation: Available Soon. Workspace View Answer Workspace

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	17. To avoid the race condition, the number of processes that may be simultaneously inside their critical section is
	A 8 B 1 C 16 D 0 Free MCQs www.sharemcq.com     Answer: Option B Explanation: Available Soon. Workspace View Answer Workspace

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	18. In analyzing the compilation of PL/I program, the term "Lexical analysis" is associated with
	A recognition of basic syntactic constructs through reductions. B recognition of basic elements and creation of uniform symbols C creation of more optional matrix. D use of macro processor to produce more optimal assembly code Free MCQs www.sharemcq.com     Answer: Option B Explanation: Available Soon. Workspace View Answer Workspace

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	19. The process of transferring data intended for a peripheral device into a disk (or intermediate store) so that it can be transferred to peripheral at a more convenient time or in bulk, is known as
	A multiprogramming B spooling C caching D virtual programming Free MCQs www.sharemcq.com     Answer: Option B Explanation: Available Soon. Workspace View Answer Workspace

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	20. The dispatcher
	A actually schedules the tasks into the processor B puts tasks in I/O wait C is always small and simple D never changes task priorities Free MCQs www.sharemcq.com     Answer: Option A Explanation: Available Soon. Workspace View Answer Workspace

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	21. Advantage of using assembly language rather than machine language is
	A It is mnemonic and easy to read. B Addresses any symbolic, not absolute C Introduction of data to program is easier D all of the above Free MCQs www.sharemcq.com     Answer: Option D Explanation: Available Soon. Workspace View Answer Workspace

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	22. What is the initial value of the semaphore to allow only one of the many processes to enter their critical section?
	A 8 B 1 C 16 D 0 Free MCQs www.sharemcq.com     Answer: Option B Explanation: Available Soon. Workspace View Answer Workspace

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	23. Which, of the following checks, cannot be carried out on the input data to a system?
	A consistency check B Syntax check C Range check D All of the above Free MCQs www.sharemcq.com     Answer: Option B Explanation: Available Soon. Workspace View Answer Workspace

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	24. The term 'polling' in a computer means a process by which a computer system
	A detects/corrects errors B multiplexes the inputs and updates the memory accordingly C decides correct alternative by analysing several ones D inquires to see if a terminal has any transaction to send Free MCQs www.sharemcq.com     Answer: Option D Explanation: Available Soon. Workspace View Answer Workspace

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	25. Which of the following is a phase of a compilation process
	A Lexical analysis B Code generation C Both of the above D Static analysis Free MCQs www.sharemcq.com     Answer: Option C Explanation: Available Soon. Workspace View Answer Workspace

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	26. Banker's algorithm for resource allocation deals with
	A deadlock prevention B deadlock avoidance C deadlock recovery D mutual exclusion Free MCQs www.sharemcq.com     Answer: Option B Explanation: Available Soon. Workspace View Answer Workspace

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	27. Non modifiable procedures are called
	A Serially usable procedures B Concurrent procedures C Reentrant procedures D Top down procedures Free MCQs www.sharemcq.com     Answer: Option C Explanation: Available Soon. Workspace View Answer Workspace

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	28. In an absolute loading scheme, which loader function is accomplished by assembler?
	A Reallocation B Allocation C Linking D Loading Free MCQs www.sharemcq.com     Answer: Option A Explanation: Available Soon. Workspace View Answer Workspace

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	29. The higher versions of the operating systems are so written that programs designed for earlier versions can still be run. What is it called?
	A Upgradability B Upward mobility C Universality D Upward compatibility Free MCQs www.sharemcq.com     Answer: Option D Explanation: Available Soon. Workspace View Answer Workspace

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	30. The principles of structured programming forbid the use of
	A WHILE-DO B GOTO C IF-THEN-ELSE D DO-WHILE Free MCQs www.sharemcq.com     Answer: Option B Explanation: Available Soon. Workspace View Answer Workspace

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	31. A critical region is
	A a program segment that has not been proved bug-free B a program segment that often causes unexpected system crashes C a program segment where shared resources are accessed D one which is enclosed by a pair of P and V operations on semaphores Free MCQs www.sharemcq.com     Answer: Option D Explanation: Available Soon. Workspace View Answer Workspace

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	32. A program
	A is a device that performs a sequence of operations specified by instructions in memory. B is the device where information is stored C is a sequence of instructions D is typically characterized by interactive processing and time of the CPU's time to allow quick response to each user. Free MCQs www.sharemcq.com     Answer: Option C Explanation: Available Soon. Workspace View Answer Workspace

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	33. Virtual memory is
	A simple to implement B used in all major commercial operating systems C less efficient in utilization of memory D useful when fast I/O devices are not available Free MCQs www.sharemcq.com     Answer: Option B Explanation: Available Soon. Workspace View Answer Workspace

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34. A base register table

A allows the programmer to write base registers and displacements explicitly in the source program. B is used to remember which of the general-purpose registers are currently available as base registers, and what base addresses they contain. C allows multiple programs to reside in separate areas of core at the same time. D is a term that refers to the control programs of an operating system. Free MCQs www.sharemcq.com     Answer: Option B Explanation: Available Soon. Workspace View Answer Workspace

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	35. The main function of the dispatcher (the portion of the process scheduler) is
	A swapping a process to the disk B assigning ready process to the CPU C suspending some of the processes when the CPU load is high D bring processes from the disk to the main memory Free MCQs www.sharemcq.com     Answer: Option B Explanation: Available Soon. Workspace View Answer Workspace

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	36. Which of the following is not true about the memory management?
	A virtual memory is used only in multi-user systems B segmentation suffers from external fragmentation C paging suffers from internal fragmentation D segmented memory can be paged Free MCQs www.sharemcq.com     Answer: Option A Explanation: Available Soon. Workspace View Answer Workspace

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	37. What problem is solved by Dijkstra's banker's algorithm?
	A mutual exclusion B deadlock recovery C deadlock avoidance D cache coherence Free MCQs www.sharemcq.com     Answer: Option C Explanation: Available Soon. Workspace View Answer Workspace

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	38. Bug means
	A A logical error in a program B A difficult syntax error in a program C Documenting programs using an efficient documentation tool D All of the above Free MCQs www.sharemcq.com     Answer: Option A Explanation: Available Soon. Workspace View Answer Workspace

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	39. Which of the following rules out the use of GO TO?
	A Flowchart B HIPO-DIAGRAMS C Nassi-Shneiderman diagram D All of the above Free MCQs www.sharemcq.com     Answer: Option C Explanation: Available Soon. Workspace View Answer Workspace

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	40. Which of the following refers to the associative memory?
	A the address of the data is generated by the CPU B the address of the data is supplied by the users C there is no need for an address i.e. the data is used as an address D the data are accessed sequentially Free MCQs www.sharemcq.com     Answer: Option C Explanation: Available Soon. Workspace View Answer Workspace

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	41. Which of the following functions are performed by the loader
	A allocate space in memory for the programs and resolve symbolic references between object decks B adjust all address dependent locations, such as address constants, to correspond to the allocated space. C physically place the machine instructions and data into memory. D All of the above Free MCQs www.sharemcq.com     Answer: Option D Explanation: Available Soon. Workspace View Answer Workspace

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	42. What is the name given to the values that are automatically provided by software to reduce keystrokes and improve a computer user's productivity?
	A Defined values B Fixed values C Default values D Special values Free MCQs www.sharemcq.com     Answer: Option C Explanation: Available Soon. Workspace View Answer Workspace

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	43. The macro processor must perform
	A recognize macro definitions and macro calls B save the macro definitions C expand macros calls and substitute arguments D all of the above Free MCQs www.sharemcq.com     Answer: Option D Explanation: Available Soon. Workspace View Answer Workspace

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	44. A file organization component of a VSAM file is:
	A relative record data set B keyed sequential data set C entry sequential data set D all of the above Free MCQs www.sharemcq.com     Answer: Option D Explanation: Available Soon. Workspace View Answer Workspace

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45. Paging

A is a method of memory allocation by which the program is subdivided into equal portions, or pages and core is subdivided into equal portions or blocks. B consists of those addresses that may be generated by a processor during execution of a computation. C is a method of allocating processor time. D allows multiple programs to reside in separate areas of core at the time. Free MCQs www.sharemcq.com     Answer: Option A Explanation: Available Soon. Workspace View Answer Workspace

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	46. In memory systems, boundary registers
	A are used for temporary program variable storage B are only necessary with fixed partitions C track page boundaries D track the beginning and ending of programs Free MCQs www.sharemcq.com     Answer: Option D Explanation: Available Soon. Workspace View Answer Workspace

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	47. Page-map table is
	A A data file B A directory C Used for address translation D All of the above Free MCQs www.sharemcq.com     Answer: Option C Explanation: Available Soon. Workspace View Answer Workspace

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	48. In which addressing mode, the address of the location of the operand is given explicitly as a part of the instruction.
	A absolute mode B immediate mode C index mode D modulus mode Free MCQs www.sharemcq.com     Answer: Option A Explanation: Available Soon. Workspace View Answer Workspace

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	49. The total time to prepare a disk drive mechanism for a block of data to be read from it is
	A latency B latency plus transmission time C latency plus seek time D latency plus seek time plus transmission time Free MCQs www.sharemcq.com     Answer: Option C Explanation: Available Soon. Workspace View Answer Workspace

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	50. Which of the following, is necessary to work on a computer
	A Compiler B Operating system C Assembly D Interpreter of the above Free MCQs www.sharemcq.com     Answer: Option B Explanation: Available Soon. Workspace View Answer Workspace

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