Operating System(Computer Aptitude ) Questions and answers for exam Preparation

Computer Aptitude

OPERATING SYSTEM MCQs

Total Questions : 814 | Page 6 of 82 pages

Question 51. The resident set of process is

A process that are actually in main memory at anytime.
A process that are actually in virtual memory at any time.
A process that are actually in disk.
None of these.

Discuss Question

Answer: Option A. -> A process that are actually in main memory at anytime.
Answer: (a)

Question 52. With round-robin CPU scheduling in a time shared system

using very large time slices degenerates into First-Come First Served Algorithm
using extremely small time slices improves performance
using very small time slices degenerate into Last-In-First-Out algorithm
using medium sized time slices leades to Shortest Request Time First algorithm.

Discuss Question

Answer: Option A. -> using very large time slices degenerates into First-Come First Served Algorithm
Answer: (a)

Question 53. With trap in process control

Operating system determines the error or exception condition that is fatal.
Operating system interrupted for maximum allowable time.
Are tables that manage information process
None of these.

Discuss Question

Answer: Option A. -> Operating system determines the error or exception condition that is fatal.
Answer: (a)

Question 54. In semaphore when the order of processes that are waiting to be removed from the queue is first in first out (FIFO) then it is called

Weak semaphore
Strong semaphore
Binary semaphore
None of these.

Discuss Question

Answer: Option B. -> Strong semaphore
Answer: (b)

Question 55. In magnetic disk, density that is in bits per linear inch

Increases in moving from the outer most track to the inner most track.
Decreases in moving from the outer most track to the inner most track.
Remains same in moving from the outer most track to the inner most track.
Randomly distributed in moving from the outer most track to the inner most track.

Discuss Question

Answer: Option A. -> Increases in moving from the outer most track to the inner most track.
Answer: (a)

Question 56. MAR (memory address register)

Contains data to be written into memory.
Contains data to be read from memory.
Specifies location in memory for next read/or writer.
Contains address of next instruction to be fetched.

Discuss Question

Answer: Option C. -> Specifies location in memory for next read/or writer.
Answer: (c)

Question 57. Following is the correct definition of a valid process transition within an operating system

wake up : ready -> running
dispatch: ready -> running
block: ready -> blocked
timer run out : ready -> blocked

Discuss Question

Answer: Option B. -> dispatch: ready -> running
Answer: (b)

Question 58. When an interrupt occurs, an operating system

ignores the interrupt
always changes state of interrupted process after processing the interrupt
always resumes execution of interrupted process after processing the interrupt
may change state of interrupted process to blocked and schedule another process

Discuss Question

Answer: Option D. -> may change state of interrupted process to blocked and schedule another process
Answer: (d)

Question 59. The operating system control tables maintains file table, because

These tables manage I/O devices and channels of the computer system.
These tables provide information about the existence of files, their location on secondary memory and their current status.
These tables provide information to manage process.
None of these.

Discuss Question

Answer: Option B. -> These tables provide information about the existence of files, their location on secondary memory and their current status.
Answer: (b)

Question 60. Thrashing can be avoided if