Operating-system practice and detailed explanation for test-1 Computer Subject

Operating-system Test-1 Computer Subject Questions and Answers

Question 21

The two modes of operation of an operating system are called _____?

A). Process and Kernel

B). Kernel and user

C). Interrupt and system

D). Ready and running

Show explanation Expand Question

Operating systems work in two modes: user mode for applications and kernel mode for core functions.

Question 22

For a single processor system _____?

A). Process scheduling is always optimal

B). Input-output always causes CPU slowdown

C). There will never be more than one running process

D). Processes spend long times waiting to execute

Show explanation Expand Question

In a single processor system, only one process can run at a time, making option C correct.

Question 23

Process is _____?

A). A program in execution

B). Program in High level language kept on disk

C). Contents of main memory

D). A job in secondary memory

Show explanation Expand Question

A process is a program in execution, including its current activity and state.

Question 24

The dispatcher _____?

A). Puts tasks in I/O wait

B). Actually schedules the tasks into the processor

C). Is always small and simple

D). Never changes task priorities

Show explanation Expand Question

The dispatcher gives control of the CPU to the process selected by the scheduler.

Question 25

An overlay is _____?

A). A part of an operating system

B). A single contiguous memory that was used is the olden days for running large programs by swapping

C). A specific memory location

D). Overloading the system with many user files

Show explanation Expand Question

Overlays allowed large programs to run in limited memory by swapping parts of the program in and out.

Question 26

System programs such as compilers are designed so that they are _____?

A). Serially usable

B). Re-enterable

C). Non reusable

D). Recursive

Show explanation Expand Question

Compilers are re-enterable, meaning they can be safely used by multiple processes without conflict.

Question 27

A process is put into wait state when _____?

A). It requests for a service that OS is not ready to perform

B). Waiting for a process to provide some input

C). It requests for a resources that is busy

D). All of these

Show explanation Expand Question

Processes enter a wait state when waiting for resources, input, or unavailable services.

Question 28

A scheduler that selects a swapped out process and puts it into the ready queue is known as ____?

A). Short level scheduler

B). Medium level scheduler

C). Long level scheduler

D). None of these

Show explanation Expand Question

The medium-term scheduler manages swapped out processes, reintroducing them into the ready queue.

Question 29

When does a context switch occur _____?

A). When an error occurs in a running program

B). When a process makes a system call

C). When an external interrupt occurs

D). All of these

Show explanation Expand Question

Context switches occur due to errors, system calls, or interrupts.

Question 30

Which one of the following statements is not true?

A). kernel is made of various modules which can not be loaded in running operating system

B). kernel remains in the memory during the entire computer session

C). kernel is the first part of operating system to load into memory during booting

D). kernel is the program that constitutes the central core of the operating system

Show explanation Expand Question

Modern kernels support loadable modules, so statement A is not true.

Operating System Test 1 Computer Subject

Available Sections

Question 21

Not clear enough?

Ask me anything?

Question 22

Not clear enough?

Ask me anything?

Question 23

Not clear enough?

Ask me anything?

Question 24

Not clear enough?

Ask me anything?

Question 25

Not clear enough?

Ask me anything?

Question 26

Not clear enough?

Ask me anything?

Question 27

Not clear enough?

Ask me anything?

Question 28

Not clear enough?

Ask me anything?

Question 29

Not clear enough?

Ask me anything?

Question 30

Not clear enough?

Ask me anything?

You might like

Jamb Computer Studies Success Kit.pdf

PAST QUESTIONS AND SOLUTIONS

Jamb Computer Studies Success Kit.pdf

PAST QUESTIONS AND SOLUTIONS

In this page

Operating System Test 1 Computer Subject

Available Sections

Question 21

Not clear enough?

Ask me anything?

Question 22

Not clear enough?

Ask me anything?

Question 23

Not clear enough?

Ask me anything?

Question 24

Not clear enough?

Ask me anything?

Question 25

Not clear enough?

Ask me anything?

Question 26

Not clear enough?

Ask me anything?

Question 27

Not clear enough?

Ask me anything?

Question 28

Not clear enough?

Ask me anything?

Question 29

Not clear enough?

Ask me anything?

Question 30

Not clear enough?

Ask me anything?

You might like

Jamb Computer Studies Success Kit.pdf PAST QUESTIONS AND SOLUTIONS

Jamb Computer Studies Success Kit.pdf PAST QUESTIONS AND SOLUTIONS

In this page

Subscribe to get latest posts!

Jamb Computer Studies Success Kit.pdf

PAST QUESTIONS AND SOLUTIONS

Jamb Computer Studies Success Kit.pdf

PAST QUESTIONS AND SOLUTIONS