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1. Dear students get fully solved assignments
Send your semester & Specialization name to our mail id :
“ help.mbaassignments@gmail.com ”
or
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Assignment
DRIVE SUMMER, 2015
PROGRAM BSCNT
SEMESTER 2
SEMESTER CODE & NAME BNT201 – OPERATING SYSTEM
BK ID B1405
CREDIT 4
MARKS 60
Note: Answer all questions. Kindly note that answers for 10 marks questions should be approximately
of 400 words. Each questionis followedbyevaluationscheme.
1 What isoperating system?Explainany four major functionsof operating system.
Answer: The operating system is the most important program that is on a computer. The operating
system basically runs the computer and allows other programs to run as well. The operating system
does all the basic things that a computer needs to do, such as recognizing inputs from the mouse or the
keyboard. It keeps track of where all the files are on the computer. It allocates resources to the various
programsthat are runningandit preventsunauthorizedaccess tothe computer.
2 What is hardware virtual machine? Discuss any three ways through which the software
virtualizationcan be done.
Answer: Computer hardware virtualization is the virtualization of computers as complete hardware
platforms, certain logical abstractions of their componentry, or only the functionality required to run

2. various operating systems.Virtualization hides the physical characteristics of a computing platform from
the users,presentinginsteadanotherabstractcomputingplatform.
There are three major types of virtualization:
3 Explainthe followingschedulingalgorithm:
a) First come Firstserved
Answer: First-come, first-served (FCFS) – sometimes first-in,first-served and first-come, first choice – is a
service policy whereby the requests of customers or clients are attended to in the order that they
arrived, without other biases or preferences. The policy can be employed when processing sales orders,
indeterminingrestaurantsea
b) ShortestJob First
Answer: Shortest-Job-First (SJF) is a non-preemptive discipline in which waiting job (or process) with the
smallest estimated run-time-to-completion is run next. In other words, when CPU is available, it is
assignedtothe processthat has smallestnextCPUburst.
The SJF schedulingis
4 Define deadlock.Discussany four conditionthat leads to deadlock.
Answer: a deadlock is a situation in which two or more competing actions are each waiting for the other
to finish, and thus neither ever does. In a transactional database, a deadlock happens when two
processes each within its own transaction updates two rows of information but in the opposite order.
For example, process A updates row 1 then row 2 in the exact timeframe that process B updates row 2
then row 1. Process A can't finish updating row 2 until process B is finished, but process B cannot finish
updatingrow1 until processA isfinished

3. 5 ExplainLRU page replacementalgorithmwith an example.
Answer: Although LRU is theoretically realizable, it is not cheap. To fully implement LRU, it is necessary
to maintain a linked list of all pages in memory, with the most recently used page at the front and the
least recently used page at the rear. The difficulty is that the list must be updated on every memory
reference. Finding a page in the list, deleting it, and then moving it to the front is a very time consuming
operation,eveninhardware.
6 What iscomputer virus? List the types of virus and its various infectionmethods.
Answer: A Computer virus is a small program that interferes with normal functions of the computer.
Usually a virus program is attached to a computer file. The file to which a virus is attached is called
infected file. When the infected file is copied on a disk, the virus is also copied and It hides itself on the
disk.
Dear students get fully solved assignments
Send your semester & Specialization name to our mail id :
“ help.mbaassignments@gmail.com ”
or
Call us at : 08263069601