Operating System MCQs

Question 1

Which of the following statements is false?

Accepted Answer

real time systems generally use non-preemptive CPU scheduling

Answer

a process scheduling algorithm is preemptive if the CPU can be forcibly removed from a process

Answer

time sharing systems generally use preemptive CPU scheduling

Answer

response time are more predictable in preemptive systems than in non preemptive systems

Question 2

Non-modifiable procedures are called

Accepted Answer

reentrant procedures

Answer

serially usable procedures

Answer

concurrent procedures

Answer

topdown procedures

Question 3

The instruction register

Accepted Answer

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

Answer

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

Answer

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

Answer

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".

Question 4

Which of the following scheduling objectives should be applied to the following: the system should admit jobs to create a mix that will keep most devices busy

Accepted Answer

to balance resource utilization

Answer

to be fair

Answer

to obey priorities

Answer

to be predictable

Question 5

Multiprogramming systems:

Accepted Answer

execute more jobs in the same time period

Answer

are easier to develop than single programming system

Answer

execute each job faster

Answer

are used only on large mainframe computers

Question 6

Backups should be done

Accepted Answer

as several incrementals, followed by an image copy

Answer

daily for most installations

Answer

weekly for most installations

Answer

as several image copies, followed by an incremental

Question 7

In an absolute loading scheme, which loader function is accomplished by assembler.

Accepted Answer

Reallocation

Answer

Allocation

Answer

Linking

Answer

Loading

Question 8

The command interpreter

Accepted Answer

is usually the primary user interface

Answer

requires fixed format commands

Answer

is menu drive

Answer

is quite different from the SCL interpreter

Question 9

A task in a blocked state

Accepted Answer

is waiting for same temporarily unavailable resources

Answer

is executable

Answer

is running

Answer

must still be placed in the run queues