Operating System MCQs

Question 1

In which addressing mode, the address of the location of the operand is given explicitly as a part of the instruction.

Accepted Answer

absolute mode

Answer

immediate mode

Answer

index mode

Answer

modulus mode

Question 2

Under virtual storage,

Accepted Answer

only the active pages of a program are stored in primary storage

Answer

a single program is processed by two or more CPUs

Answer

two or more programs are stored concurrently in primary storage

Answer

interprogram interference may occur

Question 3

A base register table

Accepted Answer

is used to remember which of the general-purpose registers are currently available as base registers, and what base addresses they contain.

Answer

allows the programmer to write base registers and displacements explicitly in the source program.

Answer

allows multiple programs to reside in separate areas of core at the same time.

Answer

is a term that refers to the control programs of an operating system.

Question 4

File record length

Accepted Answer

should be chosen to match the data characteristics

Answer

should always be fixed

Answer

should always be variable

Answer

depends upon the size of the file

Question 5

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

Accepted Answer

mutual exclusion

Answer

semaphore

Answer

multiprogramming

Answer

multitasking

Question 6

What is the name of the operating system which was originally designed by scientists and engineers for use by scientists and engineers?

Accepted Answer

UNIX

Answer

XENIX

Answer

OS/2

Answer

MS DOS

Question 7

The most common security failure is

Accepted Answer

carelessness by users

Answer

depending on passwords

Answer

too much emphasis on preventing physical access

Answer

insufficient technology used to prevent breaches

Question 8

Terminal Table

Accepted Answer

a permanent table which lists all key words and special symbols of the language in symbolic form.

Answer

contains all constants in the program

Answer

a permanent table of decision rules in the form of patterns for matching with the uniform symbol table to discover syntactic structure.

Answer

consists of a full or partial list of the token's as they appear in the program. Created by Lexical analysis and used for syntax analysis and interpretation

Question 9

Block or buffer caches are used

Accepted Answer

to improve disk performance

Answer

to handle interrupts

Answer

to increase the capacity of main memory

Answer

to speed up main memory read operation