Question bank of operating system CS.

 Question Bank

Standard:- 12th

Subject:- Computer Science (D9) Paper I

March 2021

सूचना

1. फक्त शवद्यार्थ्यांना प्रश्नप्रकारांचा सराव करून

देण्यासाठीच

2. सदर प्रश्नसंचातील प्रश्न बोर्डाच्या प्रश्नपशिके त

येतीलच असे नाही याची नोंद घ्यावी.

QUESTION BANK

XII COMPUTER SCIENCE (D9) – PAPER I

CHAPTER 1 – OPERATING SYSTEM

MCQ – 1 Mark

Q.No. Question Marking

scheme

1. Operating system is a __________

i) hardware

ii) software

iii) printer

iv) input device

1 mark for correct alternative

2. ‘Open files’ is a system call provided under _________ of operating

system.

i) Information management

ii) Process management

iii) Memory management

iv) GUI

1 mark for correct alternative

3. Program under execution is known as __________.

i) File

ii) Information

iii) Data

iv) Process

1 mark for correct alternative

4. _______is a service of memory management of operating system.

i) Copy a file

ii) Suspend a Process

iii) Allocate a chunk of memory

iv) Open a directory

1 mark for correct alternative

5. Windows 98 is a __________ operating system.

i) Single user multitasking

ii) Uni-programming

iii) Multiuser

iv) Multiprocessing

1 mark for correct alternative

6. _______ is a free operating system.

i) Unix

ii) Linux

iii) Mac OS

iv) MS Windows

1 mark for correct alternative

7. In Magnetic tapes __________ access method is used.

i) Direct

ii) Random

iii) Sequential

iv) Binary

1 mark for correct alternative

8. Concentric circles on disk surface are known as _______.

i) Tracks

ii) Sectors

iii) Clusters

iv) Paths

1 mark for correct alternative

9. Time taken to adjust the appropriate sector under read /write head in disk

is called as ____________.

i) Seek time

ii) Access time

iii) Transmission time

iv) Latency time.

1 mark for correct alternative

10. Device drivers are ____________

i) Software programs

ii) Viruses

iii) Scanners

iv) Devices used to run CD

1 mark for correct alternative

11. A terminal or VDU means _______________.

i) Voice Doubling Unit

ii) Visual Display Unit

iii) Very Dumb Unit

iv) Video Display Utility

1 mark for correct alternative

12. ____ is a logical unit of data that operating system defines for its

convenience.

i) Track

ii) Sector

iii) Block

iv) Plate

1 mark for correct alternative

13. In multiprogramming operating system, the number of processes running

simultaneously is known as _______.

i) Context

ii) Index number

iii) Threads

iv) Degree of multiprogramming

1 mark for correct alternative

14. When a process is waiting for an external event like I/O, it is in

___________ state.

i) Running

ii) Blocked

iii) Ready

iv) Halted

1 mark for correct alternative

15. In Non-preemptive philosophy of process scheduling

throughput __________

i) Decreases

ii) Increases

iii) Remains constant

iv) Has no effect

1 mark for correct alternative

16. _______ process scheduling is most suitable for real time systems.

i) Slow

ii) Non preemptive

iii) Preemptive

iv) Single

1 mark for correct alternative

17. _________ is also known as light weight process.

i) Thread

ii) Program

iii) Time slice

iv) Operating system

1 mark for correct alternative

18. Operating system maintains all the information about each process in a

data structure called ________

i) Process List

ii) Process control block

iii) Process schedule

iv) Process philosophy

1 mark for correct alternative

19. Memory management service of operating system manages allocations of

_______

i) Disk based memory

ii) Tape based memory

iii) Main memory

iv) Flash memory

1 mark for correct alternative

20. ________ is a non contiguous real memory management system.

i) Fixed partitioned

ii) Variable partitioned

iii) Single contiguous

iv) Paging

1 mark for correct alternative

21. In ___________ method of memory management system logical divisions

of a program are of variable sizes.

i) Segmentation

ii) Paging

iii) Variable partitioned

iv) Fixed partitioned.

1 mark for correct alternative

22. Wastage of memory space within the partition is called as __________

i) Compaction

ii) Internal fragmentation

iii) External fragmentation

iv) Dirty page

1 mark for correct alternative

23. If page size of 4MB memory is 2 kb then the number of higher order bits

on address bus, used to denote page numbers is _________

i) 8

ii) 9

iii) 10

iv) 11

1 mark for correct alternative

24. When a page which is not in main memory is reference then _________

occurs.

i) Locality of reference

ii) Page fault

iii) Dirty bit

iv) System crash

1 mark for correct alternative

25. _______ cannot work independently.

i) Operating system

ii) Drivers

iii) Virus

iv) Worm

1 mark for correct alternative

26. _________ spread more rapidly in computer networks but do not cause

direct harm to computer system.

i) Worms

ii) Memory resident virus

iii) Boot sector virus

iv) Bomb

1 mark for correct alternative

27. ________ control in GUI allows to select only one option from the given

options.

i) Check button

ii) Entry box

iii) Push button

iv) Radio button

1 mark for correct alternative

28. ________ is generally used in GUI to look at the information which is not

currently visible on screen.

i) Menu bar

ii) Scroll bar

iii) Push button

iv) Check button

1 mark for correct alternative

29. ________ is not an operating system.

i) DOS

ii) WINDOWS

iii) LINUX

iv) C++

1 mark for correct alternative

30. _______ is allotted to every process so that a process does not use the

CPU indefinitely.

i) Context

ii) Priority

iii) Time slice

iv) Process control block

1 mark for correct alternative

3 marks Questions.

Q.No. Question Marking scheme

1. What is an Operating System? Write various functions of Operating System.

Definition of OS 1 mark

Any 4 functions ½ mark each

2. Write in short about services provided by operating system, divided in  three different areas.

OR

Which are the three main areas in which the operating system divides its  services?

3 Services 1 mark each.

3. What is Memory Management? List services provided under it.

 About MM 2 marks 2 services ½ mark each

4. What is system call? How system calls are used in application program?

 Definition 1 mark Use 2 marks

5. Write in short different features of Windows 98. 

Any 6 features ½ mark each

6. What are features of Windows NT?

 Any 6 features ½ mark each

7. Write different features of Linux.

 Any 6 features ½ mark each

8. Write a short note on file system in operating system.

Or

What is file system in operating system?

File system 1 mark 2 types 1 mark each

9. What are two different modules of Information management system?

Write their functions in short.

Or

What are functions of file system and device management system( or

Device driver)

File system Device Driver 1 ½ marks each.

10. Write advantages of Disk based system over Tape based system. 

Any 3 advantages 1 mark each

11. Explain in short three different operations carried out while performing

read/write (or I/O) operation on disk.

(track selection, sector selection, read/write)

12. What is VDU? Explain what is dumb terminal and intelligent terminal?

 VDU 1 mark Dumb and Intelligent terminal 1 mark each

13. Explain Video RAM and how it is used in terminal hardware.

 Or

Explain video RAM along with data byte and attribute byte.

Video RAM and diagram 1 mark Data byte 1 mark Attribute byte 1 mark

14. Why terminal is called memory mapped? Explain the different memories

involved in input output operation between keyboard and the monitor.

Reason 1 mark 4 memories ½ mark each.

15. Explain the following terms related to process management:

i) Process

ii) Context switching

iii) Degree of multiprogramming

Each term 1 mark each

16. Explain context switching in process management with the help of

suitable diagram

Explanation 2 marks Diagram 1mark

17. Explain three basic process states.

 3 states 1 mark each.

18. Explain the following terms related to process scheduling.

i) Turnaround time

ii) Waiting time

iii) Response time

Each term 1 mark each.

19. Explain the following process scheduling objectives.

i) Fairness

ii) Throughput

iii) Good CPU utilization

Each term 1 mark each.

20. Explain Time slice, Preemptive and Non-preemptive philosophies of

process scheduling.

Each term 1 mark each.

21. State names of any six memory management systems.

 6 names ½ mark each

22. Explain memory map of single user operating system.

 Explanation 2 ½ marks Diagram ½ mark

23. Explain single contiguous memory management system 

Explanation 2 ½ marks Diagram ½ mark

24. Write limitations/ disadvantages of Fixed partition? 

3 limitations 1 mark each.

25. Explain in detail paging in memory management

 Explanation 2marks

26. Explain the concept of virtual memory.

 Correct answer 3 marks

27. Explain three elements of security.

 3 elements 1 mark each

28. What is security in terms of operating system? Discuss in brief threats to

security.

Definition of security 1 mark Any 3 threats 1 mark each

29. What are computer worms? Explain how worms affect computer systems?

 Definition 1 mark Explanation 2 marks

30. What is computer virus? State various types of viruses.

 Definition 1 mark Any four types ½ mark each.

31. What is computer virus? How does it operate?

 Definition 1 mark Explanation 2 marks

32. Discuss virus detection, prevention and removal philosophies.

 3 philosophies 1 mark each.

33. What is GUI? State any four advantages using GUI. 

Meaning 1 mark 4 advantages ½ mark each.

34. What is GUI? Explain in short any four features of GUI. 

Meaning of GUI 1 mark 4 features ½ mark each.

35. Explain following components of GUI.

i) Menu bar

ii) Dialogue boxes

iii) Option button

Explanation of 3 components 1 mark each

36. Explain in brief the following programs of MS-Windows.

i) Program manager

ii) File manager

iii) Control panel

3 programs 1mark each

4 marks Questions Q.No. Question Markings scheme.

1. What is Information Management? List system calls in it. About IM

 2 mark Any 4 Calls 1/2 mark each

2. What is Process Management? List system calls in it About PM

 2 mark Any 4 Calls 1/2 mark each

3. What are two different modules of Information management system?

Write their functions in short.

Or

What are functions of file system and device management system( or

Device driver)

File system Device Driver 2 marks each.

4. Explain in short the following terms related to magnetic disk

i) Track and sector

ii) Seek time

iii) Latency time/ Rotational delay

iv) Transmission time 

Each term 1 mark each.

5. Explain any four file operations on file system of Information

Management system.

Each operation 1 mark each.

6. Explain Video RAM and how it is used in terminal hardware. Video RAM

and diagram

 2 marks  Data byte 1 mark Attribute byte 1 mark

7. Explain context switching in process management with the help of

suitable example.

Explanation with diagram 2 marks Example 2 marks

8. What is process scheduling? Explain any three scheduling objectives.

 Process scheduling 1 mark Any 3 objectives explanation 1 mark each

9. What is priority? Explain Internal, External and Purchased priorities.

 Priority definition 1mark 3 priorities 1 mark each

10. Explain the concept of Multithreading with suitable example.

 Concept explanation 3 marks Example 1 mark

11. Write main functions of Memory management. State names of any four

memory management systems

2 functions 2 marks 4 system  names ½ mark each

12. What is partitioning of memory? Explain fixed and variable partitioning in

memory management.

Partitioning meaning 1 mark Fixed and variable partitioning 1 ½ marks each.

13. Write various steps involved in the allocation of partition in case of fixed

partitioned memory management.

All correct steps 3 marks Diagram 1 mark

14. Explain in detail segmentation in memory management system. Give

suitable example.

Explanation 3 marks Example 1 mark

15. Explain the following terms related to virtual memory management

i) Locality of reference

ii) Page replacement policy

iii) Working set

iv) Page fault

1 mark

1 mark

1 mark

1 mark

16. Explain security aspect of operating system. And explain three main

elements of security.

Security 1 mark 3 elements 1 mark each.

17. Explain in short any four ways in which a system can be attacked in

computing environment.

Any four ways 1 mark each

18. Explain any four methods by which computer virus can infect the

programs.

Four methods with explanation 1 mark each

19. Differentiate between computer virus and worm. 

Any four points 1 mark each

20. List essential components of GUI. Explain in brief any three components.

 List of 5 components 1 mark Explanation with diagram 1 mark each(one diagram with 3 components is considered correct.)

21. Explain following controls of GUI.

i) Push button

ii) Radio button

iii) Check button

iv) Box control

1 mark

1 mark

1 mark

2 box controls ½ mark each

22. In terms of GUI, what is window? Explain in short various operations

performed on a window.

Explanation for window with diagram 1 mark 3 operations 1 mark each.