Recents in Beach

Operating System MCQ For WBJECA ( SET - 5) VVI

WBJECA MCQ FOR NEW SYLLABUS

Operating System MCQ ( SET - 5)

O.S MCQ

  1. Which of the following scheduling policy is well suited for a time-shared operating system ?

    1. first-come-first-serve
    2. round robin
    3. shortest job first
    4. all of above
    Answer: B
    Explantion: None

  2. Which of the following memory improves the speed of execution of a program ?

    1. secondary memory
    2. virtual meory
    3. primary memory
    4. cache memory
    Answer: D
    Explantion: None

  3. ___________ refers to the amount of time required to positon the read-write head of a hard disk on appropriate sector ?

    1. access time
    2. seek time
    3. rotational latencey
    4. none of these
    Answer: B
    Explantion: None.

  4. Thrashing __________

    1. implies excessive page I/O
    2. improves the system performance
    3. decreases the degree of multiprogramming
    4. reduces page I/O
    Answer: C
    Explantion: None

  5. Copying a process from memory to disk to allow space for other processes is called__________

    1. pagefault
    2. swapping
    3. deadlock
    4. none of above
    Answer: B
    Explantion: None

  6. Which of the following page replacement algorithms suffers from Belady's anomaly ?

    1. LRU
    2. FIFO
    3. Optimal replacement
    4. both (B) and (C)
    Answer: B
    Explantion: None

  7. The problem of indefinite blockage of low-priority jobs in general priority scheduling algorithm can be solved using :

    1. aging
    2. dirty bit
    3. compaction
    4. none of above
    Answer: D
    Explantion: None

  8. The kernal keeps track of the state of each executing program by using a data structure called __________ ?

    1. file control block
    2. process control block
    3. memory control block
    4. user control block
    Answer: D
    Explantion: None

  9. Dirty bit for a page in a page table?

    1. helps maintain
    2. allows only read on a page
    3. helps avoid unnecessary writes on a paging device
    4. all of above
    Answer: C
    Explantion: None

  10. 10

    Semaphores are used to solve the problem of ________ .

    1. process synchronization
    2. mutual exclusion
    3. race condition
    4. the belady problem
    Answer: D
    Explantion: None
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