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[Fall 2015] ASSIGNMENT
PROGRAM BSc IT
SEMESTER SECOND
SUBJECT CODE & NAME BT0070, Operating Systems
CREDIT 4 BK ID B0954 MAX. MARKS 60
Q1. What is an Operating System? Explain the functions of OS.
Answer:
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, the OS performs basic tasks, such as controlling and allocating memory,
prioritizing the processing
2. What is process? Explain process control block with diagram.
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
3 What are TLBs? Why they are required in paging? 3+7 10
Answer:
A translation lookaside buffer (TLB) is a cache that memory management hardware uses to
improve virtual address translation speed. The majority of desktop, laptop, and server processors
includes one or
4. Describe the techniques of free space management of free space list. 10 10
Answer:
The disk is a scarce resource. Also disk space can be reused. Free space present on the disk is
maintained by the operating system. Physical blocks that are free are listed in a free-space list.
When a file is
5 What are computer viruses? How do they affect our system? 3+7 10
Answer:
A computer virus is written with an intention of infecting other programs. It isa part of a program
that piggybacks on to a valid program. It
Q6. Explain multistage switch based network with diagram.
Answer:
Multistage switch-based systems
Processors and memory in a multiprocessor system can be interconnected by use of a
multistage switch. A generalized type of interconnection links N inputs and N outputs through
log2N stages, each
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