operating system set 1 Detailed Explanation And More Example

Question : 1

In system buffer cache, used in UNIX, following not true

a) It is a disk cache

b) It is not a disk cache

c) Data transfer between buffer cache and user process space always occurs using DMA.

d) I/O operations with disk are handled through buffer code.

Question : 2

The amount of memory (in bytes) required for a block bitmap is

a) Disk size x 8

b) Disk size/ (8 x file system block size)

c) File system block size/disk size

d) None of these.

Question : 3

In real time scheduling: A: Static table driven approach, B: Static priority driven preemptive approach, C: Dynamic planning based approach; 1- A static analysis of feasible scheduler of dispatching is done and implemented. 2- A static analysis of feasible schedules of dispatching is done and assigns priorities to tasks. 3- Feasibility is determined at run time.

a) A - 1, B - 2, C - 3

b) A - 2, B - 3, C - 1

c) A - 3, B - 1, C - 2

d) None of these.

Question : 4

A set or resource allocations such that the system can allocate resources to each process in some order, and still avoids a deadlock is called

a) unsafe state

b) safe state

c) starvation

d) greedy allocation

Question : 5

A policy in memory management referred as clock policy because one can visualize the page frames as laid out in

a) Straight line

b) Rectangle

c) Circle

d) Square

Question : 6

The most efficient data set organization is

a) a sequential file

b) an ISAM file

c) variable depending upon the usage of the data set

d) a partitioned data set