Operating System Mcq [SET - 13] | Real Time Operating System Mcq with Answers pdf Download

 

1. When the process issues an I/O request

A) it is placed in an i/o queue
B)  it is placed in a waiting queue
C) it is placed in the ready queue
D) it is placed in the job queue

ANSWER= (A) it is placed in an i/o queue

 

2. What is the solution to starvation?

A) the number of rollbacks must be included in the cost factor
B) the number of resources must be included in resource preemption
C) resource preemption be done instead
D)  all of the mentioned

ANSWER= (A) the number of rollbacks must be included in the cost factor

 

3. What is the high speed memory between the main memory and the CPU called?

A) register memory
B) cache memory
C)  storage memory
D) virtual memory

ANSWER= (B) cache memory

 

4.  What are the two types of Semaphore?

A) Digital Semaphores and Binary Semaphores
B) Analog Semaphores and Octal Semaphores
C) Counting Semaphores and Binary Semaphores
D) Critical Semaphores and System Semaphores

ANSWER= (C) Counting Semaphores and Binary Semaphores

 

5. What does D in the D-flip flop stand for?

A)  digital
B) direct
C)  delay
D) durable

ANSWER= (C) delay

 

6. Which of the following memory unit that processor can access more rapidly

A) Main Memory
B) Virtual Memory
C) Cache memory
D) Read Only Memory

ANSWER= (A) Cache memory

 

7. Which of the following is the system tool?

A) Backup
B) Disk defragmenter
C) Both of above
D) File

ANSWER= (A) Both of above

 

8. When a computer is first turned on or restarted, a special type of absolute loader called ____ is executed

A) Compile and Go loader
B) Boot loader
C) Bootstrap loader
D) Relating loader

ANSWER= (A) Bootstrap loader

 

9. Main memory commonly is implemented in a semiconductor technology called

A) MRAM
B) SDRAM
C) DRAM
D) PRAM

ANSWER= (C) DRAM

 

10. Jobs are kept initially on the disk in the

A) Schedule pool
B) Process pool
C) System pool
D)  Job pool

ANSWER= (D)  Job pool

 

11. All unsafe states are                          

A) deadlocks
B) not deadlocks
C) fatal
D) none of the mentioned

ANSWER= (A) not deadlocks

 

12. When using counters to implement LRU, we replace the page with the                          

A) smallest time value
B) largest time value
C) greatest size
D) none of the mentioned

ANSWER= (A) smallest time value

 

13. A single is a virtual interrupt which is created by which of the following

A)  Hardware
B) OS
C) PCB
D) TLB

ANSWER= (B) OS

 

14. ___________ acts as an intermediary between the computer user and the computer hardware

A) Software
B) Mainframe
C) ROM
D) Operating System

ANSWER= (D)  Operating System

 

15. Virtual memory allows                          

A) execution of a process that may not be completely in memory
B) a program to be smaller than the physical memory
C) a program to be larger than the secondary storage
D) execution of a process without being in physical memory

ANSWER= (A) execution of a process that may not be completely in memory

 

16. General-purpose computers run most of their programs from rewritable memory, called

A) Main memory
B) Secondary memory
C) Peripheral memory
D)  Primary memory

ANSWER= (A) Main memory

 

17. Which of the following is the drawback of the One to One Model?

A) increased concurrency provided by this model
B) decreased concurrency provided by this model
C) creating so many threads at once can crash the system
D) creating a user thread requires creating the corresponding kernel thread

ANSWER= (D) creating a user thread requires creating the corresponding kernel thread

 

18. When is the Many to One model at an advantage?

A) when the program does not need multithreading
B) when the program has to be multi- threaded
C) when there is a single processor
D) none of the mentioned

ANSWER= (A) when the program does not need multithreading

 

19. Dijkstra’s banking algorithm in an operating system solves the problem of

A) deadlock avoidance
B) deadlock recovery
C)  mutual exclusion
D)  context switching

ANSWER= (A) deadlock avoidance

 

20. Which of the following page replacement algorithms suffers from Belady’s anomaly?

A) Shortest job first
B) Round robin
C) First come first serve
D) Elevator

ANSWER= (C) First come first serve

 

21. Using a pager                          

A) increases the swap time
B) decreases the swap time
C) decreases the swap time & amount of physical memory needed
D) increases the amount of physical memory needed

ANSWER= (C) decreases the swap time & amount of physical memory needed

 

22. If no cycle exists in the resource allocation graph                          

A)  then the system will not be in a safe state
B) then the system will be in a safe state
C) all of the mentioned
D)  none of the mentioned

ANSWER= (B) then the system will be in a safe state

 

23. In which type of the following OS, the response time is very crucial.

A) Network Operating System
B) Real Time Operating System
C) Batch Operating System
D) Unix Operating System

ANSWER= (B)  Real Time Operating System

 

24. What are the requirements for the solution to critical section problem?

A) Mutual Exclusion
B) Progress
C) Bounded Waiting
D)  All of Above

ANSWER= (A) All of Above

 

25. When a process begins execution with no pages in memory?

A) process execution becomes impossible
B) a page fault occurs for every page brought into memory
C) process causes system crash
D) none of the mentioned

ANSWER= (B) a page fault occurs for every page brought into memory

 

26. If the memory access time is denoted by ‘ma’ and ‘p’ is the probability of a page fault (0 <= p <= 1). Then the effective access time for a demand paged memory is

A) p x ma + (1-p) x page fault time
B) ma + page fault time
C) (1-p) x ma + p x page fault time
D) none of the mentioned

ANSWER= (C) (1-p) x ma + p x page fault time

 

27. A buffer where the data will be read into and written from is

A) LPVOID Buffer
B) LPOut Buffer
C) LPIN Buffer
D) LBLOCK Buffer

ANSWER= (A) LPVOID Buffer

 

28. What will happen when a process terminates?

A) it is removed from all queues
B) it is removed from all, but the job queue
C) its process control block is de-allocated
D) its process control block is never de- allocated

ANSWER= (A)  it is removed from all queues

 

29. When the instructions are being executed, this state is known as

A) New
B) Ready
C) Waiting
D) Running

ANSWER= (D) Running

 

30. The main function of the command interpreter is

A) to get and execute the next user-specified command
B) to provide the interface between the API and application program
C) to handle the files in operating system
D) none of the mentioned

ANSWER= (A) to get and execute the next user-specified command

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