operating system set 1 Detailed Explanation And More Example

Question : 1

Memory table is used

a) To allocate main memory to processes

b) To allocate secondary memory to processes

c) To manage virtual memory

d) A, B and C are true.

Question : 2

The Least Recently Used (LRU) policy

a) Replaces the page in memory that has not been referenced for the least time.

b) Replaces the page in memory that has not been referenced for the longest time.

c) Replaces the page in memory in round robin fashion.

d) None of these.

Question : 3

Memory that is located on the disk either Hard or floppy is referred as

a) Virtual memory

b) Real memory

c) Main memory

d) None of these.

Question : 4

In disk scheduling when SCAN (Look) policy is applied and when last track reached in one direction

a) The service direction is reversed and scan proceeds in opposite direction.

b) The arm returns to the opposite end of the disk and scan begins again.

c) A and B both true.

d) None of these.

Question : 5

RAID (Redundant Array of Independent Disks) scheme consists of

a) Five levels from one to six.

b) Six levels, from zero to five.

c) Seven levels, from zero to six.

d) None of these.

Question : 6

The activity of a file

a) is a low percentage of number of records that are added to or deleted from a file

b) is a measure of the percentage of existing records updated during a run

c) refers to how closely the files fit into the allocated space

d) is a measure of the number of records added or deleted from a file compassed with the original number of records