Operating System MCQs

1019 MCQs (Page 44 of 102)

Attempt Operating System Quiz

For any type of access, contiguous allocation requires ______ access to get a disk block.

A. Only one
B. At least two
C. Exactly two
D. None of the mentioned

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Consider a disk where blocks 2, 3, 4, 5, 8, 9, 10, 11, 12, 13, 17, 18, 25, 26 and 27 are free and the rest of the blocks are allocated. Then the free space bitmap would be _____________

A. 10000110000001110011111100011111?
B. 110000110000001110011111100011111?
C. 01111001111110001100000011100000?
D. 001111001111110001100000011100000?

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

A. The request will be placed in the queue of pending requests for that drive
B. The request will not be processed and will be ignored completely
C. The request will be not be placed
D. None of the mentioned

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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?

A. 600
B. 620
C. 630
D. 640

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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?

A. 224
B. 236
C. 245
D. 240

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Random access in magnetic tapes is _________ compared to magnetic disks.

A. Fast
B. Very fast
C. Slow
D. Very slow

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Magnetic tape drives can write data at a speed ________ disk drives.

A. Much lesser than
B. Comparable to
C. Much faster than
D. None of the mentioned

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On media that use constant linear velocity (CLV), the _____________ is uniform.

A. Density of bits on the disk
B. Density of bits per sector
C. The density of bits per track
D. None of the mentioned

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SSTF algorithm, like SJF __________ of some requests.

A. May cause starvation
B. Will cause starvation
C. Does not cause starvation
D. Causes aging

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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.

A. Look
B. Scan
C. C-scan
D. C-look

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