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DRIVE
SPRING 2017
PROGRAM
B.SC IT
SEMESTER
SECOND
SUBJECT
CODE & NAME BT0070, Operating System
1 What are the different functions of Operating Systems?
Answer: Functions of
Operating System
Operating systems perform the following important functions:
·
Processor management : It
means assigning processor to different tasks which has to be performed by the
computer system.
·
Memory
2 What is a process? Explain different process in Operating
System.
Answer: A program in execution is a process. A process is executed sequentially,
one instruction at a time. A program is a passive entity. For example, a file
on the disk. A process on the other hand is an active entity. In addition to
program code, it includes the values of the program counter, the contents of
the CPU registers, the global variables in the data section
3 Why are Round-Robin Scheduling algorithm designed for
time-sharing systems? Explain.
Answer: Round-Robin
Scheduling
The round-robin CPU scheduling algorithm is basically a preemptive
scheduling algorithm designed for time-sharing systems. One unit of time is
called a time slice(Quantum). Duration of a time slice may range between 10
msecs and about 100 msecs. The CPU scheduler
4 With the help of a block diagram discuss NOS architecture.
Answer: Network Operating
System (NOS) Architecture
The architecture
of typical NOS is shown below (Figure 9.1). The basic features in any NOS are
explained by tracing the steps involved in a remote read. It is assumed that
shared data resides on the server and
5 Describe computer worms and also mention the methods of
prevention.
Answer: A computer
worm is a full program by itself. It spreads to other computers over a network
and while doing so consumes network resources to a very large extent. It can
potentially bring the entire network
6 Discuss the advantages of Multiprocessors.
Answer: Advantages of Multiprocessors
� Performance and Computing power: Use of multiprocessor systems
speeds up an application. Problems with high inter-processor interaction can be
solved quickly.
� Fault tolerance: The inherent
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