VNSGU PAPER

BCA FY(SEM-II)

Examination October-2023

subject : 203 operating system – I

Q.1 A) Select Appropriate Correct Option.

1) PDA stand for _____

    a)Personal digital association           

    b)personal digital assistant

c) provide digital assistant

d)provide data association

2)  which one of the following explains the sequential file access method ?

    a) random access according to the given byte number

    b) read bytes one at a time ,in order

    c) read/write sequentially by record

    d) read write randomly by record

3)  which of the following statement is false regarding Linux operating system ?

1. Linux  source code is freely available and it is community based development project.
2. Linux is a multiuser operating system
3. Linux does not provide any security to the user
4. Linux provides a hierarchical file structure in which system files/user files are arranged.

 4 )  which of the following is the extension of the archive file ?

1. Doc
2. Zip
3. Obj
4. Bin

5)  IN which system each computer provide digital assistant may acts as client or server on response and request ?

   a) distributed os

   b) peer to peer

   c) cluster system

   d) network

6) —————-itself  is a file owned by the operating system

  a) database

  b) directory

  c) logical file

  d) record

7) The heads of the magnetic disk are attached to a ____________ that moves all the heads as a unit.

 a) disk arms

 b) heads

c) tracks

d) spindle

8) The full boot strap program is stored in a partition called ____________

 a) boot block

 b) bad block

 c) swap management

 d) format

9) In the ______________ algorithm ,the disk arm goes as far as the final request in each direction , and then reverses  direction  direction immediately without going to the end of the disk.

  a) c-look

  b) scan

  c) look

  d) c-scan

10) IN Linux , ___________ has all administrative privileges

  a) administrator

  b) standard user

  c)  root user

  d) child user

B) Answer the following .(any five)

1. what are disadavntages of tree-level directory structure ?
2. Difference between relative path and absolute path
3. list out operating system which are multi-tasking ,but not multi-user
4. differnce between SCAN and C-SCAN disk scheduling policy.
5. what do you mean by multiprocessing system?
6. does contiguous allocation suffer from external fragmentation? justify the answer.

Q-2 Answer the following . (any two)

1. explain file management functions in detail.
2. discuss the advantages and disadvantages of batch processing over multiprogramming.
3. define spooling. explain its working with necessary diagram.

Q-3 answer the following.

1. write a note on linked allocation with its advantages and disadvantages
2. write a note on to manage user account in Linux.
3. explain time sharing system in detail with example.

Q-4 Answer the following.

1. differentiate various file access methods.
2. write a note on Linux operating system with its version.
3. explain function and role of device controller.

Q-5 Do the following.

Suppose a disk drive has 200 cylinders number from 0-199 . drive is currently served the request at cylinder number 87.

The queue for pending request in FIFO order is as follows:

Show the disks scheduling for the following algorithm.

1. FICS     
2. LOOK   
3. SCAN
4. SSTF