Important Objective Of System Software And Operating System

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51-The field that contains a segment index or an internal index is called-Target Datum

52-A program in execution is called-Process

53-Jobs which are admitted to the system for processing is called-Long-Term Scheduling

54-A set of techniques that allow to execute a program which is not entirely in memory is called-Virtual memory

55-SSTF stands for-Shortest-Seek-time-first scheduling

56-Before proceeding with its execution, each process must acquire all the resources it needs is called-Hold and Wait

57-Virtual memory is-used in all major commercial operating systems

58-Relocation bits used by relocating loader are specified by-Assembler or Translator

59-Resolution of externally defined symbols is performed by-Linker

60-Relocatable programs-can be loaded almost anywhere in memory

61-Page stealing-is taking page frames other working sets

62-The total time to prepare a disk drive mechanism for a block of data to be read from is its-latency plus seek time

63-To avoid race condition, the maximum number of processes that may be simultaneously inside the critical section is-one

64-The memory allocation scheme subject to “external” fragmentation is-segmentation

65-Page fault frequency in an operating system is reduced when the locality of reference is applicable to the process

66-In which of the following page replacement policies Balady’s anomaly occurs?- FIFO

67-Virtual memory can be implemented with-Segmentation &  Paging

68-Recognition of basic syntactic constructs through reductions, this task is performed by-Syntax analysis

69-A grammar for a programming language is a formal description of-Structure

70-Swapping - is a technique of temporarily removing inactive programs from the memory of computer system

71-Ageing-is a technique of improving the priority of process waiting in Queue for CPU allocation

72-Latency Time-is the time required by a sector to reach below read/write head.

73-Which of the following is most general phase structured grammar? Context – Sensitive

74-File record length-Should be chosen to match the data characteristics.

75-A public key encryption system-Allows only the correct receiver to decode the data

Important Notes On System Software and Operating System

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26- The “blocking factor” of a file is- The number of logical records in one physical record

27- Which of these is a component of a process precedence sequence?

(A) Process name (B) Sequence operator ‘;’ (C) Concurrency operator ‘,’ (D) All of the above                        Ans-D

28- Which amongst the following is valid syntax of the Fork and Join Primitive?

(A) Fork <label>      (B) Fork <label> (C) For <var>   (D) Fork <var>

      Join <var>                Join <label>         Join <var>       Join <var>                  Ans-A

29- Nested Macro calls are expanded using the- FILO rule (First in last out)

30- A parser which is a variant of top-down parsing without backtracking is- Recursive Descend.

31- The expansion of nested macro calls follows- LIFO rule

32- In a two-pass assembler, the task of the Pass II is to- synthesize the target program.

33- A linker program- links the program with other programs needed for its execution.

34- Which scheduling policy is most suitable for a time-shared operating system-RR(Round-Robin.)

35- A critical section is a program segment- where shared resources are accessed.

36- An operating system contains 3 user processes each requiring 2 units of resource

R .The minimum number of units of R such that no deadlocks will ever arise is-4

37- Locality of reference implies that the page reference being made by a process- is likely to be the one of the pages used in the last few page references.

38- Which of these is not a part of Synthesis phase- Perform LC processing

39-The syntax of the assembler directive EQU is-<symbol>EQU<address space>

40-The following features are needed to implement top down parsing

(A) Source string marker  (B) Prediction making mechanism

(C) Matching and Backtracking mechanism  (D) All of the above     Ans-D                           
41-A macro definition consists of

(A) A macro prototype statement (B) One or more model statements

(C) Macro pre-processor statements (D) All of the above     Ans-D

42-The main reason to encrypt a file is to-Secure it for transmission

43-Which of the following is not a key piece of information, stored in single page table entry, assuming pure paging and virtual memory-A reference for the disk block that stores the page

44-A UNIX device driver is-Structured into two halves called top half and bottom half

45-The following is not a layer of IO management module-MCS (Management Control System)

46-Which amongst the following is not a valid page replacement policy?- RU policy (Recurrently used)

47-An assembly language is a-low level programming language

48-TII stands for-Table of incomplete instructions

49-An analysis, which determines the syntactic structure of the source statement, is called-Syntax analysis

50-Action implementing instruction’s meaning are a actually carried out by-instruction execution