SAD
2010,
2012
2013
2009
2010
1. State True or False:(a)An operating system is a program that manages the computer hardware.
(b) A time-shared operating system allows many users to share the computer simultaneously.
(c) Parallel system has one CPU in close communication.
(d) Multiprogramming also allows time sharing.
(e) The occurrence of an event is usually signaled by an interrupt from either the hardware or the software.
(f) Main memory is a non-volatile storage device that loses its
contents when power in turned.
(g) A more restrictive type of real time system is soft-real-timesystem.(h) Software are may trigger an interrupt by executing a special operation called a system call.
(i) System calls provide the interface between a process and the operating system.
(j) A distributed system is a collection of processors that share memory peripheral devices or a clock. 2. Write notes on:
(a) Polling
(b) DMA
(c) Spooling
(d) Buffering
3. Differentiate between:
(a) Multitasking and Multiprogramming
(b) Parallel system Distributed system
4. (a) What is operating system? Give any five function of operating system?
(b) What are the different types of operating system with example?
5. (a) Define Process. What is the different process state?
(b) Describe the function of process control block with diagram.
6. (a) Define Virtual memory?
(b) What are the different memory management algorithms?
7. Differentiate between:-
a)Logical and physical addresses .
b) Internal and External fragmentation.
8. Supposed that a disk has 5000 cylinders numbered 0 to 4999 . the drive is currently serving a request at a cylinder 143 and the previous request was at cylinder 125 .the queue of pending request in fifo order is 86 ,1470 ,913 , 1774 ,948 ,1509 ,1022 ,1750 ,130 .starting from the current head position ,what is the total distance that the disk arm moves to satisfy the entire pending request for each of the following disk scheduling algorithms?
a. FCFS
b. SSTF
c. SCAN
d. LOOK
9. Define cryptography. What
2012
1. Fill in the blanks :-
a) In multiprocessing, no job is perform due to……….problem.
b) The program generated address is called………
c) An operating system is a …………software.
d) MMU is responsible for changing virtual address to ………address.
e) FIFO scheduling is ……………Scheduling.
f) The number of processes completed per unit time is known as............
g) In ……….the job is processed at exact time.
h) Demanding empty page at virtual memory is……….
i) The types of implementing file technique are contiguous and ………….
J) A process state has ready, waiting………..and termination state.
2. What do you mean by File Allocation? Define contiguous and noncontiguous allocation with its limitation.
3. Find total seek time from FCFS and SJF with 50 Cylinders if the request is 10, 12, 15,35,5 and 40. Consider head position is in 6.
4. (a) Explain various types of Security and what do you mean by cryptography?
(b) Explain various shell command used in LINUX operating system.
5. (a) What is an operating system? What are the main functions of an operating system?
(b) Explain swapping and why it is preferred?
6. (a) What is process control block(PCB)? Explain with example.
(b) Compare Turnaround time with FCFS and SJF if P1=5 sec, p2=9 sec, p3=4sec, p4=7sec
7. (a) Explain Inter process communication and deadlock in multiprocessing system.
(b) Write briefly on the function of MMU.
8. (a) Write short notes on any two:
(i) Threading
(ii) DMA
(iii) Storage Hierarchy
(b) What do you mean by defragmentation?
9. (a) Explain various types of file organization.
(b) Differentiate between Logical and Physical Address.
2013
CAPP
Paper-2
Full Marks: 50
Time: 3 hours
Answer any five questions
The figures in the right-hand margin indicate marks Candidates are required to give their answers in their own words as far as practicable
1. What is an operating system? Briefly explain any five services provided by an operating system to the users and to programs.
2. What do you mean by scheduler? Explain the primary objective of scheduling. Describe the differences among short term, medium term and long term scheduling.
3. What is the difference between a program and a process? Explain the different process state with diagram.
4. Explain the differences in the degree to which the following scheduling algorithms discriminate in favour of short process:
I. FCFS
II. RR
5. (a) What do you mean by encryption? What are two advantages of encryption?
(b) Explain the following allocation algorithm: First fit, Best fit and Worst fit.
6. (a) Define term DMA? Explain it.
(b) Write down file system of LINUX.
7. What do you mean by “virtual memory”? What are the criteria of optical page replacement algorithm? Explain.
8. Write shorts notes on any three:
(a) System call
(b) Buffering
(c) Spooling
(d) Paging
(e) Thrashing.
2009
1. What are objective of an OS design? Define the essential properties of any two types of OS?
2. Describe process scheduling. Explain the idea hind scheduler and threading?
3. Define memory management .Differentiate between simple paging and virtual memory paging?
4. What do you understand by encryption? Explain the term authenticating a user’s identity?
5. Explain different type of scheduling use in OS.
6. Define term DMA? Discuss briefly strategies followed in swap space management.
7. Define LINUX OS? Explain I/O system?
8. Write short notes on :-
a) Storage hierarchy
b) System services
c) CPU Scheduling.
9. Define disk structure .Differentiate between FCFS and SJF?
10. Explain briefly the significance of a LINUX file. What is the principle objective of the I/O system?
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