Operating System Questions Answers - Set 2

• 22. What is the maximum number of processes that may enter simultaneously inside the critical section to avoid race condition ?

  1. One
  2. Two
  3. Three
  4. Four

  Answer And Explanation

  Answer: Option A

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• 23. Which scheduling policy is most suitable for time shared operating system ?

  1. Shortest job first
  2. FCFS
  3. LCFS
  4. Round robin

  Answer And Explanation

  Answer: Option D

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• 24. What are global locks ?

  1. they synchronize access to local resources
  2. they synchronize access to global resources
  3. they synchronize access to local and global resources
  4. none of above

  Answer And Explanation

  Answer: Option B

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• 25. Belady anomaly occurs in ?

  1. LIFO
  2. FIFO
  3. LRU
  4. NRU

  Answer And Explanation

  Answer: Option B

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• 26. Files can have ?

  1. Read Access
  2. Write Access
  3. Copy Access
  4. All of above

  Answer And Explanation

  Answer: Option D

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• 27. When did IBM released the first version of its disk operating system DOS version 1.0 ?

  1. 1981
  2. 1982
  3. 1983
  4. 1984

  Answer And Explanation

  Answer: Option A

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• 28. What is a page fault ?

  1. is an spelling error in a page in memory
  2. is a reference to a page which is in another program
  3. is an access to a page not currently in memory
  4. always occurs whenever a page is accessed

  Answer And Explanation

  Answer: Option C

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