Translator for low level programming language were termed as
(A) Assembler (B) Compiler
(C) Linker (D) Loader
Ans: (A)
Analysis which determines the meaning of a statement once its grammatical structure becomes known is termed as
(A)Semantic analysis (B) Syntax analysis
(C) Regular analysis (D) General analysis
Ans: (A)
Load address for the first word of the program is called
(A)Linker address origin (B) load address origin
(C) Phase library (D) absolute library
Ans: (B)
Symbolic names can be associated with
(A)Information (B) data or instruction
(C) operand (D) mnemonic operation
Ans: (B)
The translator which perform macro expansion is called a
(A)Macro processor (B) Macro pre-processor
(C) Micro pre-processor (D) assembler
Ans: (B)
Shell is the exclusive feature of
(A)UNIX (B) DOS
(C) System software (D) Application software
Ans: (A)
A program in execution is called
(A)Process (B) Instruction
(C) Procedure (D) Function
| Ans: (A) | |||
| Interval between the called
(A) Waiting time |
time | of | submission and completion of the job is
(B) Turnaround time |
| (C) Throughput | (D) Response time | ||
Ans: (B)
A scheduler which selects processes from secondary storage device is called
(A)Short term (B) Long term scheduler.
(C) Medium term scheduler. (D) Process scheduler.
Ans: (C)
The scheduling in which CPU is allocated to the process with least CPU-burst time is called
(A)Priority Scheduling (B) Shortest job first Scheduling
(C) Round Robin Scheduling (D) Multilevel Queue Scheduling
Ans: (B)
The term ‘page traffic’ describes
number of pages in memory at a given
number of papers required to be brought in at a given page
the movement of pages in and out of memory.
number of pages of executing programs loaded in
Ans: (C)
The “turn-around” time of a user job is the
time since its submission to the time its results become
time duration for which the CPU is allotted to the
total time taken to execute the job.
time taken for the job to move from assembly phase to completion
Ans: (C)
Which of the following can be used as a criterion for classification of data structures used in language
nature of a data structure (B) purpose of a data structure
(C) lifetime of a data structure (D) all of the above.
Ans: (D)
Memory utilization factor shall be computed as follows
memory in use/allocated
memory in use/total memory connected.
memory allocated/free existing
memory committed/total memory
Ans: (B)
Program ‘preemption’ is
forced de allocation of the CPU from a program which is executing on the CPU.
release of CPU by the program after completing its
forced allotment of CPU by a program to
a program terminating itself due to detection of an
Ans: (A)
An assembler is
programming language
syntax
machine
data
Ans: (C)
Which of the following is not a fundamental process state
ready (B) terminated
(C) executing (D) blocked
Ans: (D)
| Q.18 | ‘LRU’ page replacement policy is | |
| (A) Last Replaced Unit.
(C) Least Recently Used. |
(B) Last Restored Unit.
(D) Least Required Unit. |
Ans: (C)
Which of the following is true?
Block cipher technique is an encryption
Steam cipher technique is an encryption
Both (A) and (B).
Neither of (A) and (B).
Ans: (C)
Which of the following approaches do not require knowledge of the system state?
deadlock (B) deadlock prevention.
(C) deadlock avoidance. (D) none of the above.
Ans: (D)
Program generation activity aims at
Automatic generation of program
Organize execution of a program written in PL
Skips generation of program
Speedens generation of program
Ans: (A)
Which amongst the following is not an advantage of Distributed systems?
Reliability (B) Incremental growth
(C) Resource sharing (D) None of the above
Ans: (A)
An imperative statement
Reserves areas of memory and associates names with them
Indicates an action to be performed during execution of assembled program
Indicates an action to be performed during optimization
None of the above
Ans: (B)
Which of the following loader is executed when a system is first turned on or restarted
Boot loader (B) Compile and Go loader
(C) Bootstrap loader (D) Relating loader
Ans: (C)
Poor response time is usually caused by
Process busy
High I/O rates
High paging rates
Any of the above
Ans: (D)
“Throughput” of a system is
Number of programs processed by it per unit time
Number of times the program is invoked by the system
Number of requests made to a program by the system
None of the above
Ans: (A)
The “blocking factor” of a file is
The number of blocks accessible to a file
The number of blocks allocated to a file
The number of logical records in one physical record
None of the above
Ans: (C)
Which of these is a component of a process precedence sequence?
Process name (B) Sequence operator ‘;’
(C) Concurrency operator ‘,’ (D) All of the above
Ans: (D)
Which amongst the following is valid syntax of the Fork and Join Primitive?
Fork <label> (B) Fork <label>
Join <var> Join <label>
(C) For <var> (D) Fork <var>
Join <var> join <var>
Ans: (A)
Nested Macro calls are expanded using the
FIFO rule (First in first out) (B) LIFO (Last in First out)
(C) FILO rule (First in last out) (D) None of the above
Ans: (B)
A parser which is a variant of top-down parsing without backtracking is
Recursive (B) Operator Precedence.
(C) LL(1) parser. (D) LALR Parser.
Ans: (A)
The expansion of nested macro calls follows
FIFO (B) LIFO rule.
(C) LILO rule. (D) priority rule.
Ans: (B)
In a two-pass assembler, the task of the Pass II is to
separate the symbol, mnemonic opcode and operand fields.
build the symbol
construct intermediate
synthesize the target program.
Ans: (D)
A linker program
places the program in the memory for the purpose of
relocates the program to execute from the specific memory area allocated to
links the program with other programs needed for its execution.
interfaces the program with the entities generating its input
Ans: (C)
Which scheduling policy is most suitable for a time-shared operating system
Shortest-job (B) Elevator.
(C) Round-Robin. (D) First-Come-First-Serve.
Ans: (C)
A critical section is a program segment
which should run in a certain specified amount of
which avoids
where shared resources are accessed.
which must be enclosed by a pair of semaphore operations, P and
Ans: (C)
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
(A) 4. (B) 3.
(C) 5. (D) 6.
Ans: (A)
Locality of reference implies that the page reference being made by a process
will always be to the page used in the previous page
is likely to be the one of the pages used in the last few page references.
will always be to one of the pages existing in
will always lead to a page
Ans: (B)
Which of these is not a part of Synthesis phase
Obtain machine code corresponding to the mnemonic from the Mnemonics table
Obtain address of a memory operand from the symbol table
Perform LC processing
Synthesize a machine instruction or the machine form of a constant
Ans: (C)
The syntax of the assembler directive EQU is
EQU <address space> (B) <symbol>EQU<address space>
(C) <symbol>EQU (D) None of the above
Ans: (B)
The following features are needed to implement top down parsing
Source string marker
Prediction making mechanism
Matching and Backtracking mechanism
All of the above
Ans: (D)
A macro definition consists of
A macro prototype statement (B) One or more model statements
(C) Macro pre-processor statements (D) All of the above
Ans: (D)
The main reason to encrypt a file is to .
Reduce its size (B) Secure it for transmission
(C) Prepare it for backup (D) Include it in the start-up sequence
Ans: (B)
Which of the following is not a key piece of information, stored in single page table entry, assuming pure paging and virtual memory
Frame number
A bit indicating whether the page is in physical memory or on the disk
A reference for the disk block that stores the page
None of the above
Ans: (C)
A UNIX device driver is
Structured into two halves called top half and bottom half
Three equal partitions
Unstructured
None of the above
Ans: (A)
The following is not a layer of IO management module
PIOCS (Physical Input Output Control System)
LIOCS (Logical Input Output Control System)
FS (File System)
MCS (Management Control System) Ans: (D)
Which amongst the following is not a valid page replacement policy?
LRU policy (Least Recently Used)
FIFO policy (First in first out)
RU policy (Recurrently used)
Optimal page replacement policy
Ans: (C)
Consider a program with a linked origin of Let the memory area allocated to it have the start address of 70000. Which amongst the following will be the value to be loaded in relocation register?
(A) 20000 (B) 50000
(C) 70000 (D) 90000
Ans: (None of the above choice in correct. )
An assembly language is a
low level programming language
Middle level programming language
High level programming language
Internet based programming language
Ans: (A)
TII stands for
Table of incomplete instructions
table of information instructions
translation of instructions information
translation of information instruction
Ans: (A)
An analysis, which determines the syntactic structure of the source statement, is called
Sementic analysis (B) process analysis
(C) Syntax analysis (D) function analysis
Ans: (C)
Action implementing instruction’s meaning are a actually carried out by
Instruction fetch
Instruction decode
instruction execution
Instruction program
Ans: (C)
The field that contains a segment index or an internal index is called
target datum (B) target offset
(C) segment field (D) fix dat
Ans: (A)
A program in execution is called
process (B) function
(C) CPU (D) Memory
Ans: (A)
Jobs which are admitted to the system for processing is called
long-term scheduling (B) short-term scheduling
(C) medium-term scheduling (D) queuing
Ans: (A)
A set of techniques that allow to execute a program which is not entirely in memory is called
demand paging (B) virtual memory
(C) auxiliary memory (D) secondary memory
Ans: (B)
57 SSTF stands for
Shortest-Seek-time-first scheduling (B) small – small-time-first
(C) simple-seek-time-first (D) small-simple-time-first scheduling
Ans: (A)
Before proceeding with its execution, each process must acquire all the resources it needs is called
hold and wait (B) No pre-emption
(C) circular wait (D) starvation
Ans: (A)
Virtual memory is
simple to implement
used in all major commercial operating systems
less efficient in utilization of memory
useful when fast I/O devices are not available
Ans: (B)
Relocation bits used by relocating loader are specified by
Relocating loader itself (B) Assembler or Translator
(C) Macro processor (D) Both (A) and (B) Ans: (B)
Resolution of externally defined symbols is performed by
Linker (B) Loader
(C) Compiler (D) Editor
Ans: (A)
Relocatable programs
cannot be used with fixed partitions
can be loaded almost anywhere in memory
do not need a linker
can be loaded only at one specific location
Ans: (B)
Page stealing
is a sign of efficient system
is taking page frames other working sets
should be the tuning goal
is taking larger disk spaces for pages paged out
Ans: (B)
The total time to prepare a disk drive mechanism for a block of data to be read from is its
latency
latency plus transmission time
latency plus seek time
latency plus seek time plus transmission time
Ans: (C)
To avoid race condition, the maximum number of processes that may be simultaneously inside the critical section is
zero (B) one
(C) two (D) more than two
Ans: (B)
The memory allocation scheme subject to “external” fragmentation is
segmentation (B) swapping
(C) pure demand paging (D) multiple fixed contiguous partitions
Ans: (A)
Page fault frequency in an operating system is reduced when the
processes tend to the I/O-bound
size of pages is reduced
processes tend to be CPU-bound
locality of reference is applicable to the process
Ans: (D)
In which of the following page replacement policies Balady’s anomaly occurs?
FIFO (B) LRU
(C) LFU (D) NRU
Ans: (A)
Which of the following are language processors?
Assembler (B) Compiler
(C) Interpreter (D) All of the above
Ans: (D)
Virtual memory can be implemented with
Segmentation (B) Paging
(C) None (D) all of the above
Ans: (D)
Recognition of basic syntactic constructs through reductions, this task is performed by
Lexical analysis (B) Syntax analysis
(C) Semantic analysis (D) Structure analysis
Ans: (B)
A grammar for a programming language is a formal description of
Syntax (B) Semantics
(C) Structure (D) Code
Ans: (C)
is a technique of temporarily removing inactive programs from the memory of computer system
Swapping (B) Spooling
(C) Semaphore (D) Scheduler
Ans: (A)
is a technique of improving the priority of process waiting in Queue for CPU allocation
Starvation (B) Ageing
(C) Revocation (D) Relocation
Ans: (B)
is the time required by a sector to reach below read/write
Seek Time (B) Latency Time
(C) Access time (D) None
Ans: (B)
Which of the following is most general phase structured grammar?
Context – Sensitive (B) Regular
(C) Context – Free (D) None of the above
Ans: (A)
File record length
Should always be fixed
Should always be variable
Depends upon the size of file
Should be chosen to match the data
Ans: (D)
A public key encryption system
Allows only the correct receiver to decode the data
Allows only one to decode the
Allows only the correct sender to decode the
Does not encode the data before transmitting