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[summer, 2015] ASSIGNMENT
PROGRAM – BCA (REVISED FALL 2012)
SEMESTER - II
SUBJECT CODE & NAME - BCA2010 –
OPERATING SYSTEM
CREDIT
– 4 BK ID - B1405 MAX. MARKS =60
Q1.
Define operating system. Explain any four major functions of operating system
2+8 = 10
Answer:
Operating System is a System Software (Set of system programs) which provides
an environment to help the user to execute the programs. An operating system
(OS) is a software program that manages the hardware and software resources of
a computer. A key component of system software,
Q2.
What is hardware virtual machine? Discuss the three ways through which the
software virtualization can be done 4+6=10
Answer:
Hardware
Virtual Machine
The original meaning of
virtual machine, sometimes called a hardware virtual machine, is that of a
number of discrete identical execution environments on a single computer, each
of which runs an operating
Q3.
Explain the following scheduling algorithm [10 Marks].
a)
First come first served
b)
Shortest Job First 5+5=10
Answer:
a) First-Come-First-Served Scheduling
Algorithm
This is one of the
brute force algorithms. A process that requests for the CPU first is allocated
the CPU first. Hence, the name first come first serve. The FCFS algorithm is
implemented by using a first-in-
Q4.
Define deadlock. Discuss any four conditions that lead to deadlock 4+6= 10
Answer:
Definition:
Several processes compete for a finite set of
resources in a multi-programmed environment. A process requests for resources
that may not be readily available at the time of the request. In such a case
the process goes into a wait state. It may so happen that this process may
never change state because the
Q5.
Explain LRU page replacement algorithms with an example 4+6= 10
Answer:
LRU
page replacement algorithm
The main distinction
between FIFO and optimal algorithm is that the FIFO algorithm uses the time
when a page was brought into memory (looks back) whereas the optimal algorithm
uses the time when a page is to be used in future (looks ahead). If the recent
past is used as an approximation of
Q6.
What is computer virus? List the types of virus and its various infection
methods. 4+6 = 10
Answer: Computer Virus
A computer virus is written with
an intention of infecting other programs. It is a part of a program that
piggybacks on to a valid program. It
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125/subject and rs 625/semester only.
if urgent then call us on 08791490301, 08273413412
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