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System calls, Processes, Threads, Inter‐process communication, Concurrency and synchronization. Deadlock. CPU scheduling. Memory management and Virtual memory. File systems. Disks is also under this

$$\scriptsize{\overset{{\large{\textbf{Mark Distribution in Previous GATE}}}}{\begin{array}{|c|c|c|c|c|c|c|c|}\hline
\textbf{Year}&\textbf{2024-1} & \textbf{2024-2} &\textbf{2023}&  \textbf{2022} & \textbf{2021-1}&\textbf{2021-2}&\textbf{Minimum}&\textbf{Average}&\textbf{Maximum}
\\\hline\textbf{1 Mark Count} &2&2&3& 2 &4&2&2&2.5&4
\\\hline\textbf{2 Marks Count} & 4&4&3&4 &1&3&1&3.16&4
\\\hline\textbf{Total Marks} & 10&10&9&10 &6&8&\bf{6}&\bf{8.83}&\bf{10}\\\hline
\end{array}}}$$

Recent questions in Operating System

#3321
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#3322
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#3323
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Consider a memory system consists of a single external cache with an access time of 30ns and a hit rate of 0.85, and a main memory with an access time of 80ns. Now we add virtual ... ?( Marks: 0.00 ) 8ns 30ns 40ns 51ns
#3324
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1 answers
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A unix I node has 10 direct pointers 1 double indirect, 1 triple indirect and 1 quadruple indirect pointers. Disk block size is 1 byte. If the max number of bytes of a ... disk bock?a. 8b. 16c. 24d. 32 The answer given at most places is 32.
#3325
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Schedule following processes using Preemptive priority algorithm and calculate the average TAT A.TB.TPriority ( )P15512P2659P3247P4166P5424P6338Your Answer:14.833Correct Answer: 13.83 Status: incorrect
#3326
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Consider the following C' codeAssume P1 and P2 are two concurrent processes and sharing the global variables x, y and z. Assignmentsand tests are atomic ... terminatesThe number of statements correct about code of P1 and P2 is __________ .
#3327
3.2k
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1 answers
3 votes
Consider a system with 2 level paging applicable the page table is divided into 8k pages of size 16kB.The memory is byte addresable if the physical address ... inner and outer page table.A-32KB,128KBB-32KB,32KBC-128KB,128KBD-128KB,32KB
#3328
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What all topics do we need to study from the topic ' File Systems' in Operating System for GATE ?
#3329
3.8k
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3 answers
1 votes
Consider a system with 2-levels of paging and a TLB with hit rate of 95% and TLB access time of 1ns. Find the effective memory access time if there's a data cache whose hit rate ... 100ns.100ns. 27ns 25ns 30ns 20ns
#3330
441
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I think it's 64B block but still I'm not sure how to get the answer please provide a full explanation
#3331
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The question is: 46 bit virtual addressing system uses 3 level paging.Page table entry size=32 bits. Size of the page table is 1 page.The processor uses 1 MB ... table?1) 2KB2) 4KB3) 8KB4) 16KB My answer: 16KBActual answer: 8KB Plz explain.
#3332
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1 answers
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REFERENCE :https://gateoverflow.in/96844/operating-systems-2-8
#3333
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2 answers
4 votes
#3334
1.3k
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4 answers
3 votes
46 bit Virtual addressing system uses 3 level paging. The page table entry is 32 bits. Size of Page Table is equal to 1 page. The processor uses 1 MB, 16 way set ... 64 block. What is the size of Page Table? a) 2KB b) 4KBc) 8KBd) 16KB
#3335
268
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Which of the following require a device driver ? (GATE 2002)(a) has not been used for the longest time in the past?(b)will not be used for the longest time ... c)has been used least number of times?(d) has been used most number of times ?
#3336
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#3337
257
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Consider the incoming requests for files located on tracks, which are before the disc head by distance 1,5,21,85 followed by further requests for files which are on track ... seek length if SSTF is used?A. 16.86B.24.55C 35.57D 46.28
#3338
1.4k
views
0 answers
1 votes
How to calculate MAXIMUM POSSIBLE FILE SIZE and TOTAL POSSIBLE FILE SIZE in unix os.---------------------------------------------------------------- ... possible file size=$[#direct dba's+DB size/DBA.+[DB size/DBA]^{2}+......]* DB size$
#3339
313
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it seems confusing
#3340
449
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Does Mutex provide Bounded Waiting solution ? (since it can lead to deadlock state, and I studied somewhere that if there is deadlock then we cannot assure Bounded Waiting and somewhere I read Mutex provides Bounded Waiting solution).