SYMCA (Part II) (Under Faculty of Engg.) Examination, 2017
UNIX OPERATING SYSTEM (Elective
Day and Date Wednesday, 17-5-2017 Total Marks 100
Time: 3.00 p.m. to 6.00 p.m.
1. MCQ 20
The at the centre of the unix operating system provides basic
services.
Hardware Software
Both a and b None of the above
is an instance of program in execution.
File Process
Program None of the above
If the Kernel writes the pages of the memory to a swap device is called
system.
Swapping Paging
Both a and b None of the above
The file table keeps track of the byte of offsets in the file where the users
next will start.
Read Write
a and b None of the above
In unix file subsystem access file data using mechanism.
Buffering Blocking
Byte by byte None of the above
module allocates CPU to process.
Scheduler Kernel
Operating system None of above
The device no. is the file system no.
Logical Physical
Significant None of the above
Inode exists in form on a disk.
Static Dynamic
Both a and b None of these
To read a disk block a process uses algorithm to search
for it in the buffer cache.
getblk iget
bread None of these
10) Execute permission on a directory allows a process to the
directory for a file name.
Read Write Search None of the above
11) The process is executing in mode.
User Kernel
Both a and b None of these
12) The state is really same as the state ready to run in memory.
Pre empted Zombie
Sleeping None of these
13) A process can access its U area when it executes in mode.
Kernel User
Both a and b None of these
14) The location of the region is memory.
Physical Cache
Secondary None of these
15) system call changes the process sate form asleep to ready to
run in memory.
Sleep Wakeup
Both a and b None of the above
16) A swap device is in a configurable section of disk.
Block Byte
Bit None of the above
17) The is a Kernel process that swaps out memory pages that are
no longer part of the working set of a process.
Swapper Page stealer
Both a and b None of the above
18) Which of the following feature of the unix may be used for inter process
communication
Signals Pipes
Semaphore All of these
19) A clist is a linked list of cblocks with account of the no. of character
on the list.
Variable length Fixed length
Predefined length None of these
20) The fork system call must allocates space for process.
Child Parent
Both a and b None of these
SECTION I
2. Write short notes on (any
Architecture of UNIX OS.
Reading and writing pipe system calls.
Building block primitives.
Write an algorithm for bwrite.
Direct and indirect blocks in inode.
3. Explain in detail allocation of disk blocks. 10
Explain scenarios for retrieval of a buffer from buffer pool. 10
OR
Write and explain an algorithm alloc (allocating disk block). 10
SECTION II
4. Write short notes on (any 20
Process states and transitions.
Allocation of swap space.
Disk drivers.
Process tracing.
Swapping processes in.
5. Explain process region pages and page tables with an examples. 10
Explain different system calls involved in driver interface. 10
OR
Write an algorithm exec. 10