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

Computer Aptitude

OPERATING SYSTEM MCQs

Total Questions : 814 | Page 5 of 82 pages

Question 41. The most efficient data set organization is

a sequential file
an ISAM file
variable depending upon the usage of the data set
a partitioned data set

Discuss Question

Answer: Option C. -> variable depending upon the usage of the data set
Answer: (c)

Question 42. Data from and to magnetic disk is transformed in

Continuation
Blocks
Block and Continuation both
None of these.

Discuss Question

Answer: Option B. -> Blocks
Answer: (b)

Question 43. In system buffer cache, used in UNIX, following not true

It is a disk cache
It is not a disk cache
Data transfer between buffer cache and user process space always occurs using DMA.
I/O operations with disk are handled through buffer code.

Discuss Question

Answer: Option B. -> It is not a disk cache
Answer: (b)

Question 44. 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 - 1, B - 2, C - 3
A - 2, B - 3, C - 1
A - 3, B - 1, C - 2
None of these.

Discuss Question

Answer: Option A. -> A - 1, B - 2, C - 3
Answer: (a)

Question 45. The amount of memory (in bytes) required for a block bitmap is

Disk size x 8
Disk size/ (8 x file system block size)
File system block size/disk size
None of these.

Discuss Question

Answer: Option B. -> Disk size/ (8 x file system block size)
Answer: (b)

Question 46. In multi processor scheduling, independent parallelism indicates

There is synchronization among processes at gross level.
There is no explicit synchronization among processes.
A parallel processing or multi tasking is done within a single application.
None of these.

Discuss Question

Answer: Option B. -> There is no explicit synchronization among processes.
Answer: (b)

Question 47. Multiprogramming systems

are easier to develop than single programming systems
execute each job faster
execute more jobs in the same time period
are used only one large mainframe computers

Discuss Question

Answer: Option C. -> execute more jobs in the same time period
Answer: (c)

Question 48. In defining page table structure in virtual memory, A page number portion of a virtual address is mapped into a hash table using simple hash function, where hash table contains a pointer to the inverted page table, which contains page table entries, this approach is referred as