I/O Management & Disk Scheduling | Operating System

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May 05, 2022
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  1. 1. I/O hardware contains ____________

    1. bus
    2. controller
    3. I/O port and its registers
    4. All of the mentioned
    Show Answer
    Answer :     Option ( d )

  2. 2. When hardware is accessed by reading and writing to the specific memory locations, then it is called ____________

    1. port-mapped I/O
    2. controller-mapped I/O
    3. bus-mapped I/O
    4. memory-mapped I/O
    Show Answer
    Answer :     Option ( d )

  3. 3. Device drivers are implemented to interface ____________

    1. character devices
    2. block devices
    3. network devices
    4. All of the mentioned
    Show Answer
    Answer :     Option ( d )

  4. 4. The device-status table contains ____________

    1. each I/O device type
    2. each I/O device address
    3. each I/O device state
    4. All of the mentioned
    Show Answer
    Answer :     Option ( d )

  5. 5. Which buffer holds the output for a device?

    1. Spool
    2. Output
    3. Status
    4. Magic
    Show Answer
    Answer :     Option ( a )

  6. 6. In _______ information is recorded magnetically on platters.

    1. electrical disks
    2. magnetic disks
    3. assemblies
    4. cylinders
    Show Answer
    Answer :     Option ( b )

  7. 7. The heads of the magnetic disk are attached to a _____ that moves all the heads as a unit.

    1. spindle
    2. track
    3. disk arm
    4. pin
    Show Answer
    Answer :     Option ( c )

  8. 8. The set of tracks that are at one arm position make up a ___________

    1. magnetic disks
    2. cylinders
    3. assemblies
    4. electrical disks
    Show Answer
    Answer :     Option ( b )

  9. 9. The time taken to move the disk arm to the desired cylinder is called the ____________

    1. positioning time
    2. random access time
    3. seek time
    4. rotational latency
    Show Answer
    Answer :     Option ( c )

  10. 10. The time taken for the desired sector to rotate to the disk head is called ____________

    1. rotational latency
    2. positioning time
    3. random access time
    4. seek time
    Show Answer
    Answer :     Option ( a )

  11. 11. Whenever a process needs I/O to or from a disk it issues a ______________

    1. system call to the CPU
    2. system call to the operating system
    3. a special procedure
    4. All of the mentioned
    Show Answer
    Answer :     Option ( b )

  12. 12. If a process needs I/O to or from a disk, and if the drive or controller is busy then ____________

    1. the request will not be processed and will be ignored completely
    2. the request will be not be placed
    3. the request will be placed in the queue of pending requests for that drive
    4. None of the mentioned
    Show Answer
    Answer :     Option ( c )

  13. 13. Consider a disk queue with requests for I/O to blocks on cylinders. 98 183 37 122 14 124 65 67. Considering FCFS (first cum first served) scheduling, the total number of head movements is, if the disk head is initially at 53 is?

    1. 600
    2. 620
    3. 640
    4. 650
    Show Answer
    Answer :     Option ( c )

  14. 14. Consider a disk queue with requests for I/O to blocks on cylinders. 98 183 37 122 14 124 65 67. Considering SSTF (shortest seek time first) scheduling, the total number of head movements is, if the disk head is initially at 53 is?

    1. 224
    2. 236
    3. 240
    4. 245
    Show Answer
    Answer :     Option ( b )

  15. 15. SSTF algorithm, like SJF __________ of some requests.

    1. may cause starvation
    2. will cause starvation
    3. does not cause starvation
    4. causes aging
    Show Answer
    Answer :     Option ( a )

  16. 16. In the ______ algorithm, the disk arm starts at one end of the disk and moves toward the other end, servicing requests till the other end of the disk. At the other end, the direction is reversed and servicing continues.

    1. LOOK
    2. SCAN
    3. C-SCAN
    4. C-LOOK
    Show Answer
    Answer :     Option ( b )

  17. 17. In the _______ algorithm, the disk head moves from one end to the other, servicing requests along the way. When the head reaches the other end, it immediately returns to the beginning of the disk without servicing any requests on the return trip.

    1. LOOK
    2. SCAN
    3. C-SCAN
    4. C-LOOK
    Show Answer
    Answer :     Option ( c )

  18. 18. In the ______ algorithm, the disk arm goes as far as the final request in each direction, then reverses direction immediately without going to the end of the disk.

    1. LOOK
    2. SCAN
    3. C-SCAN
    4. C-LOOK
    Show Answer
    Answer :     Option ( a )

  19. 19. The data structure for a sector typically contains ____________

    1. header
    2. trailer
    3. data area
    4. All of the mentioned
    Show Answer
    Answer :     Option ( d )

  20. 20. The _______ program initializes all aspects of the system, from CPU registers to device controllers and the contents of main memory, and then starts the operating system.

    1. main
    2. bootloader
    3. bootstrap
    4. rom
    Show Answer
    Answer :     Option ( c )

  21. 21. For most computers, the bootstrap is stored in ________

    1. RAM
    2. ROM
    3. Cache
    4. Tertiary storage
    Show Answer
    Answer :     Option ( b )

  22. 22. A disk that has a boot partition is called a _________

    1. start disk
    2. end disk
    3. boot disk
    4. All of the mentioned
    Show Answer
    Answer :     Option ( c )

  23. 23. Defective sectors on disks are often known as __________

    1. good blocks
    2. bad blocks
    3. destroyed blocks
    4. damaged blocks
    Show Answer
    Answer :     Option ( b )

  24. 24. DMA stands for ___________

    1. Dual Memory Access
    2. Direct Memory Access
    3. Digital Memory Access
    4. None of the mentioned
    Show Answer
    Answer :     Option ( b )

  25. 25. Modes of bus operation is/are ______

    1. word-at-a-time mode
    2. block mode
    3. Both A and B
    4. None of the mentioned
    Show Answer
    Answer :     Option ( c )

  26. 26. RAID stands for _________

    1. Redundant Array of Independent Disks
    2. Removed Array of Independent Disks
    3. Redundant Array of Individual Disks
    4. Redundant Array of Independent Data
    Show Answer
    Answer :     Option ( a )

  27. 27. In RAID level 4, one block read, accesses __________

    1. all disks simultaneously
    2. all disks sequentially
    3. only one disk
    4. None of the mentioned
    Show Answer
    Answer :     Option ( c )

  28. 28. If a disk fails in RAID level ___________ rebuilding lost data is easiest.

    1. 1
    2. 2
    3. 3
    4. 4
    Show Answer
    Answer :     Option ( a )

  29. 29. The technique of duplicating every disk is known as :

    1. Shadowing
    2. Mirroring
    3. Redundancy
    4. All of the mentioned
    Show Answer
    Answer :     Option ( b )

  30. 30. RAID level _______ refers to disk mirroring.

    1. 0
    2. 1
    3. 2
    4. 3
    Show Answer
    Answer :     Option ( b )

  31. 31. RAID level ______ is also known as bit interleaved parity organisation.

    1. 0
    2. 1
    3. 2
    4. 3
    Show Answer
    Answer :     Option ( d )

  32. 32. Floppy disks are examples of :

    1. Primary storage
    2. Secondary storage
    3. Tertiary storage
    4. None of the mentioned
    Show Answer
    Answer :     Option ( c )

  33. 33. In SSD hard disk, SSD stands for

    1. Super State Drives
    2. Super State Disk
    3. Solid State Drives
    4. Solid State Disk
    Show Answer
    Answer :     Option ( c )

  34. 34. Where are programs stored when they NOT running?

    1. BIOS
    2. ROM
    3. RAM
    4. Hard Drive
    Show Answer
    Answer :     Option ( d )

  35. 35. In the computer the term “Backing” means –

    1. Starting the computer
    2. Splitting a large file
    3. Copy files and data into other storage
    4. Protect computer from virus
    Show Answer
    Answer :     Option ( c )

  36. 36. Basically what kind is the secondary storage memory?

    1. Volatile Memory
    2. Non-volatile Memory
    3. Both A and B
    4. None of the mentioned
    Show Answer
    Answer :     Option ( b )

  37. 37. The process by which a storage disk can be divided into some storage drive sector is called _________

    1. tracking
    2. formatting
    3. partitioning
    4. allotting
    Show Answer
    Answer :     Option ( c )

  38. 38. Which of the following storage device can store maximum amount of data?

    1. Floppy disk
    2. Hard disk
    3. CD
    4. DVD
    Show Answer
    Answer :     Option ( b )

  39. 39. Which technology is used in CD?

    1. Electro magnetic
    2. Laser
    3. Mechanical
    4. Electrical
    Show Answer
    Answer :     Option ( b )

  40. 40. Which of the following storage device have a limitation that we can only store data to it but can not erase or modify it?

    1. Hard Disk
    2. CD
    3. Pendrive
    4. None of the mentioned
    Show Answer
    Answer :     Option ( b )
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