Operating Systems Concepts

1.   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

E.      None of the above

2.   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

E.      None of the above

3.   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

E.None of the above

         

4.   A system program that combines the separately compiled modules of a program into a form suitable for execution

A.      assembler

B.      linking loader

C.      cross compiler

D.     load and go

E.      None of the above

5.   Process is

A.      program in High level language kept on disk

B.      contents of main memory

C.      a program in execution

D.     a job in secondary memory

E.      None of the above

6.   dressing structure

A.     defines the fundamental method of determining effective operand addresses

B.      are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.

C.      performs indicated operations on two fast registers of the machine and leave the result in one of the registers.

D.     all of the above

E.      None of the above

7.   The Memory Buffer Register (MBR)

A.      is a hardware memory device which denotes the location of the current instruction being executed.

B.      is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.

C.      contains the address of the memory location that is to be read from or stored into.

D.     contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".

E.      None of the above

8.   The strategy of allowing processes that are logically runnable to be temporarily suspended is called

A.     preemptive scheduling

B.      non preemptive scheduling

C.      shortest job first

D.     first come first served

E.      None of the above

9.   The Storage-to-Storage instructions

A.     have both their operands in the main store.

B.      which perform an operation on a register operand and an operand which is located in the main store, generally leaving the result in the register, expect in the case of store operation when it is also written into the specified storage location.

C.      which perform indicated operations on two fast registers of the machine and have the result in one of the registers

D.     all of the above

E.      None of the above

10.                     The LRU algorithm

A.      pages out pages that have been used recently

B.      pages out pages that have not been used recently

C.      pages out pages that have been least used recently

D.     pages out the first page in a given area

E.      None of the above

         

11.                     Which of the following systems software does the job of merging the records from two files into one?

A.      Security software

B.      Utility program

C.      Networking software

D.     Documentation system

E.      None of the above

12.                     Fork is

A.      the dispatching of a task

B.      the creation of a new job

C.      the creation of a new process

D.     increasing the priority of a task

E.      None of the above

13.                     Thrashing

A.      is a natural consequence of virtual memory systems

B.      can always be avoided by swapping

C.      always occurs on large computers

D.     can be caused by poor paging algorithms

E.      None of the above

14.                     Supervisor state is

A.      never used

B.      entered by programs when they enter the processor

C.      required to perform any I/O

D.     only allowed to the operating system

E.      None of the above

15.                     Which of the following instruction steps, would be written within the diamond-shaped box, of a flowchart?

A.      S = B - C

B.      IS A<10

C.      PRINT A

D.     DATA X,4Z

E.      None of the above

16.                     Which of the following statements is false?

A.      the technique of storage compaction involves moving all occupied areas of storage to one end or other of main storage

B.      compaction does not involve relocation of programs

C.      compaction is also know as garbage collection

D.     the system must stop everything while it performs the compaction

E.      None of the above

17.                     Interprocess communication

A.      is required for all processes

B.      is usually done via disk drives

C.      is never necessary,

D.     allows processes to synchronize activity

18.                     Which of the following functions is(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

E.      None of the above

19.                     User-Friendly Systems are:

A.      required for object-oriented programming

B.      easy to develop

C.      common among traditional mainframe operating systems

D.     becoming more common

E.      None of the above

20.                     Which of the following addressing modes, facilitates access to an operand whose location is defined relative to the beginning of the data structure in which it appears?

A.      ascending

B.      sorting

C.      index

D.     indirect

E.      None of the above