M.Sc. (Semester- (CBCS) Examination Oct/Nov-2017
Computer Science
OPERATING SYSTEM
Day Date: Tuesday,21-11-2017 Max. Marks: 70
Time: 10.30 AM to 1.00 PM
Instructions: Question no. 1 and 2 are compulsory.
Attempt any 3 questions from Q. no. 3 to Q. no. 7
Figures to the right indicate full marks.
Q.1 Choose correct alternatives. 10
Boot startup process
Loads system files to RAM
Checks the Computer connections
Clean up the computer memory
Prepare the computer ready
memory unit that processor can access more rapidly.
Main Memory Virtual Memory
Cache memory Read Only Memory
Which operating system implementation has to focus on the issue of
good response time?
Batch Processing Multiprogramming
Time sharing All of these
A critical section is a program segment
Which is having a higher priority
Where shared resources are accessed
Which forces deadlocks
Where code is shared by programs
A process needs resources to accomplish its task.
CPU time Memory files
I/O devices All of these
Which of the following do not belong to queues for processes?
Job queue PCB Queue
Device Queue Read Queue
Which of the following memory allocation scheme suffers from external
fragmentation?
Segmentation Pure demand paging
Swapping Paging
A scheduler which selects processes from Primary memory is called

Long Term scheduler Short Term scheduler
Long Term scheduler Job scheduler
The mechanisms that bring a page into memory only when it is needed
is called
Fragmentation Segmentation
Page replacement Demand paging
Page 2 of 2
SLR-MG-290
10) OS interleaves execution of processes in an application
program to meet its deadline.
Batch processing Real time
Multiprogramming Time sharing
State True or False. 04
The co-operating processes require an interprocess communication
mechanism to communicate with each other
Page replacement is commonly implemented by demand paging.
A tree structured file directory system allows easy storage and retrieval
of file names.
A solution to the problem of indefinite blockage of low-priority processes
is aging.
Q.2 Write short notes of the following. 08
Interrupt.
Types of system call.
Answer the following. 06
Differentiate between Hard real time and Soft real time system.
What is external fragmentation and when does it occur?
Q.3 Answer the following.
What is process? Explain process control block. 07
Explain the term:-
Process
Program versus process
Thread
07
Q.4 Answer the following.
What is paging? Explain in detail. 07
Explain the concept and techniques for free space management. 07
Q.5 Answer the following.
Briefly explain various managements of operating system and their
responsibilities in detail.
07
Explain the basic concept of segmentation with neat diagram. 07
Q.6 Answer the following.
State and explain the benefits of virtual memory. 07
Explain the concept of critical section problem. 07
Q.7 Answer the following.
Explain logical versus physical address space. 07
What is deadlock? Explain deadlock prevention. 07