Operating System Questions Answers - Chapter 1

• 22. Belady anamoly occurs in

  1. Optimal replacement
  2. FIFO
  3. LRU
  4. both in FIFO and LRU

  Answer :

  Option B

• 23. Which is non pre-emptive

  1. Round robin
  2. FIFO
  3. MQS
  4. MQSF

  Answer :

  Option B

• 24. Operating system is

  1. A collection of hardware components
  2. A collection of input output devices
  3. A collection of software routines
  4. All of above

  Answer :

  Option C

• 25. Semaphores function is to

  1. synchronize critical resources to prevent deadlock
  2. synchronize processes for better CPU utilization
  3. used for memory management
  4. none of above

  Answer :

  Option A

• 26. In which scheduling policies, context switching never takes place

  1. FCFS
  2. round robin
  3. Shortest job first
  4. Pre-empitive

  Answer :

  Option A

• 27. Remote computing services involves the use of timesharing and

  1. multiprocessing
  2. interactive processing
  3. batch processing
  4. real time processing

  Answer :

  Option C

• 28. A thread is

  1. lightweight process where the context switching is low
  2. lightweight process where the context swithching is high
  3. used to speed up paging
  4. used in dead locks

  Answer :

  Option A