कम्प्युटर र सूचना प्रविधि (प्राविधिक)
कम्प्युटर र सूचना प्रविधि (प्राविधिक)
Computer & IT (Technical) · ५,०७६ प्रश्न
५,०७६ प्रश्न उपलब्ध। मोड छान्नुहोस्:
कम्प्युटर र IT: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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The SCAN disk scheduling algorithm is also known as the:
सही उत्तर: घ) Elevator algorithm
Like a lift, the head moves to one end servicing requests and then reverses direction.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The disk scheduling algorithm that services requests while moving in one direction and, on reaching the end, returns to the beginning without servicing requests on the return trip is:
सही उत्तर: क) C-SCAN
Circular SCAN treats the cylinders as a circular list, giving more uniform waiting times than SCAN.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Head at cylinder 50, moving upward; pending requests 82, 170, 43, 140, 24, 16 and 190. If the LOOK algorithm is used (reversing at the last request instead of the disk end), the total head movement is:
सही उत्तर: ख) 314 cylinders
LOOK goes 50 to 190 (140 cylinders), then reverses down to 16 (174 cylinders): 140 + 174 = 314.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A disk has cylinders 0 to 199. The head is at cylinder 50 moving towards higher cylinders, and the request queue is 82, 170, 43, 140, 24, 16, 190. What is the total head movement using SCAN?
सही उत्तर: ग) 332 cylinders
SCAN goes 50 to the end at 199 (149 cylinders), then reverses to 16 (183 cylinders): 149 + 183 = 332.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Which page replacement algorithm approximates LRU by using a reference bit and a circular list of pages?
सही उत्तर: ख) Second-chance (Clock) algorithm
The clock algorithm skips a page whose reference bit is 1 (clearing it) and replaces the first page found with reference bit 0.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The tendency of a program to access the same and nearby memory locations repeatedly over a short period is called:
सही उत्तर: ख) Locality of reference
Locality of reference (temporal and spatial) is why caching and paging work well.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The set of pages that a process has referenced in its most recent Δ (delta) page references is called its:
सही उत्तर: घ) Working set
The working-set model uses the pages referenced in a recent window to estimate how many frames a process needs and to prevent thrashing.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For the reference string 1, 2, 3, 2, 1, 5, 2, 1, 6, 2, 5, 6, 3, 1, 3 with 3 frames (initially empty), how many page faults does LRU cause?
सही उत्तर: ख) 8
Faults occur on the references to 1, 2, 3, 5, 6, 5, 3 and 1, i.e. 8 page faults; all other references are hits.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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For the reference string 7, 0, 1, 2, 0, 3, 0, 4, 2, 3, 0, 3, 2, 1, 2, 0, 1, 7, 0, 1 with 3 frames (initially empty), how many page faults does the Optimal (OPT) algorithm cause?
सही उत्तर: क) 9
Replacing the page whose next use is farthest in the future gives 9 faults; LRU gives 12 and FIFO gives 15 for this string.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Copy-on-write, used after fork(), means that:
सही उत्तर: क) Parent and child initially share pages, and a page is copied only when one of them modifies it
Copy-on-write makes fork() fast because only pages that are actually modified ever get duplicated.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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